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options.txt   For Vim version 9.1.  Last change: 2024 Dec 03


                  VIM REFERENCE MANUAL    by Bram Moolenaar


Options                                                 options

1. Setting options                      set-option
2. Automatically setting options        auto-setting
3. Options summary                      option-summary

For an overview of options see quickref.txt option-list.

Vim has a number of internal variables and switches which can be set to
achieve special effects.  These options come in three forms:
        boolean         can only be on or off           boolean toggle
        number          has a numeric value
        string          has a string value

==============================================================================
1. Setting options                                      set-option E764

                                                        :se :set
:se[t][!]               Show all options that differ from their default value.
                        When [!] is present every option is on a separate
                        line.

:se[t][!] all           Show all but terminal options.
                        When [!] is present every option is on a separate
                        line.

:se[t] termcap          Show all terminal options.  Note that in the GUI the
                        key codes are not shown, because they are generated
                        internally and can't be changed.  Changing the terminal
                        codes in the GUI is not useful either...
                        The options have the form t_AB, see
                        terminal-options.

:se[t]! termcap         Idem, but don't use multiple columns.

                                                                E518 E519
:se[t] {option}?        Show value of {option}.

:se[t] {option}         Toggle option: set, switch it on.
                        Number option: show value.
                        String option: show value.

:se[t] no{option}       Toggle option: Reset, switch it off.

                                                           :set-! :set-inv
:se[t] {option}!   or
:se[t] inv{option}      Toggle option: Invert value.

                                :set-default :set-& :set-&vi :set-&vim
:se[t] {option}&        Reset option to its default value.  May depend on the
                        current value of 'compatible'.
:se[t] {option}&vi      Reset option to its Vi default value.
:se[t] {option}&vim     Reset option to its Vim default value.

:se[t] all&             Set all options to their default value.  The values of
                        these options are not changed:
                          all terminal options, starting with t_
                          'columns'
                          'cryptmethod'
                          'encoding'
                          'key'
                          'lines'
                          'term'
                          'ttymouse'
                          'ttytype'
                        Warning: This may have a lot of side effects.

                                            :set-args :set= E487 E521
:se[t] {option}={value}         or
:se[t] {option}:{value}
                        Set string or number option to {value}.
                        For numeric options the value can be given in decimal,
                        hex (preceded with 0x) or octal (preceded with '0' or
                        '0o').
                        The old value can be inserted by typing 'wildchar' (by
                        default this is a <Tab> or CTRL-E if 'compatible' is
                        set). Many string options with fixed syntax and names
                        also support completing known values.  See
                        cmdline-completion and complete-set-option.
                        White space between {option} and '=' is allowed and
                        will be ignored.  White space between '=' and {value}
                        is not allowed.
                        See option-backslash for using white space and
                        backslashes in {value}.

:se[t] {option}+={value}                                :set+=
                        Add the {value} to a number option, or append the
                        {value} to a string option.  When the option is a
                        comma-separated list, a comma is added, unless the
                        value was empty.
                        If the option is a list of flags, superfluous flags
                        are removed.  When adding a flag that was already
                        present the option value doesn't change.
                        Also see :set-args above.

:se[t] {option}^={value}                                :set^=
                        Multiply the {value} to a number option, or prepend
                        the {value} to a string option.  When the option is a
                        comma-separated list, a comma is added, unless the
                        value was empty.
                        Also see :set-args above.

:se[t] {option}-={value}                                :set-=
                        Subtract the {value} from a number option, or remove
                        the {value} from a string option, if it is there.
                        If the {value} is not found in a string option, there
                        is no error or warning.  When the option is a comma
                        separated list, a comma is deleted, unless the option
                        becomes empty.
                        When the option is a list of flags, {value} must be
                        exactly as they appear in the option.  Remove flags
                        one by one to avoid problems.
                        The individual values from a comma separated list or
                        list of flags can be inserted by typing 'wildchar'.
                        See complete-set-option.
                        Also see :set-args above.

The {option} arguments to ":set" may be repeated.  For example:
        :set ai nosi sw=3 ts=3
If you make an error in one of the arguments, an error message will be given
and the following arguments will be ignored.

                                                        :set-verbose
When 'verbose' is non-zero, displaying an option value will also tell where it
was last set.  Example:
        :verbose set shiftwidth cindent?
   shiftwidth=4
          Last set from modeline line 1
  cindent
          Last set from /usr/local/share/vim/vim60/ftplugin/c.vim line 30
This is only done when specific option values are requested, not for ":verbose
set all" or ":verbose set" without an argument.
When the option was set by hand there is no "Last set" message.
When the option was set while executing a function, user command or
autocommand, the script in which it was defined is reported.
Note that an option may also have been set as a side effect of setting
'compatible'.
A few special texts:
        Last set from modeline line 1
                Option was set in a modeline.
        Last set from --cmd argument
                Option was set with command line argument --cmd or +.
        Last set from -c argument
                Option was set with command line argument -c, +, -S or
                -q.
        Last set from environment variable
                Option was set from an environment variable, $VIMINIT,
                $GVIMINIT or $EXINIT.
        Last set from error handler
                Option was cleared when evaluating it resulted in an error.

{not available when compiled without the +eval feature}

                                                        :set-termcap E522
For {option} the form "t_xx" may be used to set a terminal option.  This will
override the value from the termcap.  You can then use it in a mapping.  If
the "xx" part contains special characters, use the <t_xx> form:
        :set <t_#4>=^[Ot
This can also be used to translate a special code for a normal key.  For
example, if Alt-b produces <Esc>b, use this:
        :set <M-b>=^[b
(the ^[ is a real <Esc> here, use CTRL-V <Esc> to enter it)
The advantage over a mapping is that it works in all situations.

You can define any key codes, e.g.:
        :set t_xy=^[foo;
There is no warning for using a name that isn't recognized.  You can map these
codes as you like:
        :map <t_xy> something
                                                                E846
When a key code is not set, it's like it does not exist.  Trying to get its
value will result in an error:
        :set t_kb=
        :set t_kb
        E846: Key code not set: t_kb

The t_xx options cannot be set from a modeline or in the sandbox, for
security reasons.

The listing from ":set" looks different from Vi.  Long string options are put
at the end of the list.  The number of options is quite large.  The output of
"set all" probably does not fit on the screen, causing Vim to give the
more-prompt.

                                                        option-backslash
To include white space in a string option value it has to be preceded with a
backslash.  To include a backslash you have to use two.  Effectively this
means that the number of backslashes in an option value is halved (rounded
down).
In options 'path''cdpath', and 'tags', spaces have to be preceded with three
backslashes instead for compatibility with version 3.0 where the options can
be separated by either commas or spaces.
Comma-separated options like 'backupdir' and 'tags' will also require commas
to be escaped with two backslashes, whereas this is not needed for
non-comma-separated ones like 'makeprg'.
When setting options using :let and literal-string, you need to use one
fewer layer of backslash.
A few examples:
   :set makeprg=make\ file          results in "make file"
   :let &makeprg='make file'        (same as above)
   :set makeprg=make\\\ file        results in "make\ file"
   :set tags=tags\ /usr/tags        results in "tags" and "/usr/tags"
   :set tags=tags\\\ file           results in "tags file"
   :let &tags='tags\ file'          (same as above)

   :set makeprg=make,file           results in "make,file"
   :set makeprg=make\\,file         results in "make\,file"
   :set tags=tags,file              results in "tags" and "file"
   :set tags=tags\\,file            results in "tags,file"
   :let &tags='tags\,file'          (same as above)

The "|" character separates a ":set" command from a following command.  To
include the "|" in the option value, use "\|" instead.  This example sets the
'titlestring' option to "hi|there":
   :set titlestring=hi\|there
This sets the 'titlestring' option to "hi" and 'iconstring' to "there":
   :set titlestring=hi|set iconstring=there

Similarly, in legacy script the double quote character starts a comment.  To
include the '"' in the option value, use '\"' instead.  This example sets the
'titlestring' option to 'hi "there"':
   :set titlestring=hi\ \"there\"

In Vim9 script it's simpler, comments start with a '#' character, and only
when preceded by white space.  A backslash is needed less often:
   vim9script
   set titlestring=hi\ "there"
   set titlestring=hi#there#
   set titlestring=hi\ \#there#

For Win32 backslashes in file names are mostly not removed.  More precise: For
options that expect a file name (those where environment variables are
expanded) a backslash before a normal file name character is not removed.  But
a backslash before a special character (space, backslash, comma, etc.) is used
like explained above.
There is one special situation, when the value starts with "\\":
   :set dir=\\machine\path          results in "\\machine\path"
   :set dir=\\\\machine\\path       results in "\\machine\path"
   :set dir=\\path\\file            results in "\\path\file" (wrong!)
For the first one the start is kept, but for the second one the backslashes
are halved.  This makes sure it works both when you expect backslashes to be
halved and when you expect the backslashes to be kept.  The third gives a
result which is probably not what you want.  Avoid it.

                                add-option-flags remove-option-flags
                                E539 E550 E551 E552
Some options are a list of flags.  When you want to add a flag to such an
option, without changing the existing ones, you can do it like this:
   :set guioptions+=a
Remove a flag from an option like this:
   :set guioptions-=a
This removes the 'a' flag from 'guioptions'.
Note that you should add or remove one flag at a time.  If 'guioptions' has
the value "ab", using "set guioptions-=ba" won't work, because the string "ba"
doesn't appear.

                           :set_env expand-env expand-environment-var
Environment variables in specific string options will be expanded.  If the
environment variable exists the '$' and the following environment variable
name is replaced with its value.  If it does not exist the '$' and the name
are not modified.  Any non-id character (not a letter, digit or '_') may
follow the environment variable name.  That character and what follows is
appended to the value of the environment variable.  Examples:
   :set term=$TERM.new
   :set path=/usr/$INCLUDE,$HOME/include,.
When adding or removing a string from an option with ":set opt-=val" or ":set
opt+=val" the expansion is done before the adding or removing.


Handling of local options                       local-options

Note: The following also applies to global-local options.

Some of the options only apply to a window or buffer.  Each window or buffer
has its own copy of this option, thus each can have its own value.  This
allows you to set 'list' in one window but not in another.  And set
'shiftwidth' to 3 in one buffer and 4 in another.

The following explains what happens to these local options in specific
situations.  You don't really need to know all of this, since Vim mostly uses
the option values you would expect.  Unfortunately, doing what the user
expects is a bit complicated...

When splitting a window, the local options are copied to the new window.  Thus
right after the split the contents of the two windows look the same.

When editing a new buffer, its local option values must be initialized.  Since
the local options of the current buffer might be specifically for that buffer,
these are not used.  Instead, for each buffer-local option there also is a
global value, which is used for new buffers.  With ":set" both the local and
global value is changed.  With "setlocal" only the local value is changed,
thus this value is not used when editing a new buffer.

When editing a buffer that has been edited before, the options from the window
that was last closed are used again.  If this buffer has been edited in this
window, the values from back then are used.  Otherwise the values from the
last closed window where the buffer was edited last are used.

It's possible to set a local window option specifically for a type of buffer.
When you edit another buffer in the same window, you don't want to keep
using these local window options.  Therefore Vim keeps a global value of the
local window options, which is used when editing another buffer.  Each window
has its own copy of these values.  Thus these are local to the window, but
global to all buffers in the window.  With this you can do:
        :e one
        :set list
        :e two
Now the 'list' option will also be set in "two", since with the ":set list"
command you have also set the global value.
        :set nolist
        :e one
        :setlocal list
        :e two
Now the 'list' option is not set, because ":set nolist" resets the global
value, ":setlocal list" only changes the local value and ":e two" gets the
global value.  Note that if you do this next:
        :e one
You will get back the 'list' value as it was the last time you edited "one".
The options local to a window are remembered for each buffer.  This also
happens when the buffer is not loaded, but they are lost when the buffer is
wiped out :bwipe.

Special local window options                    local-noglobal

The following local window options won't be copied over when new windows are
created, thus they behave slightly differently:

        Option          Reason
        'previewwindow' there can only be a single one
        'scroll'        specific to existing window
        'winfixbuf'     specific to existing window
        'winfixheight'  specific to existing window
        'winfixwidth'   specific to existing window

Special local buffer options

The following local buffer options won't be copied over when new buffers are
created, thus they behave slightly differently:

        Option          Reason
        'filetype'      explicitly set by autocommands
        'syntax'        explicitly set by autocommands
        'bufhidden'     denote special-buffers
        'buftype'       denote special-buffers
        'readonly'      will be detected automatically
        'modified'      will be detected automatically

                                                        :setl :setlocal
:setl[ocal][!] ...      Like ":set" but set only the value local to the
                        current buffer or window.  Not all options have a
                        local value.  If the option does not have a local
                        value the global value is set.
                        With the "all" argument: display local values for all
                        local options.
                        Without argument: Display local values for all local
                        options which are different from the default.
                        When displaying a specific local option, show the
                        local value.  For a global/local boolean option, when
                        the global value is being used, "--" is displayed
                        before the option name.
                        For a global option the global value is
                        shown (but that might change in the future).

:se[t] {option}<        Set the effective value of {option} to its global
                        value.
                        For string global-local options, the local value is
                        removed, so that the global value will be used.
                        For all other options, the global value is copied to
                        the local value.

:setl[ocal] {option}<   Set the effective value of {option} to its global
                        value.
                        For number and boolean global-local options, the
                        local value is removed, so that the global value will
                        be used.
                        For all other options, including string global-local
                        options, the global value is copied to the local
                        value.

Note that the behaviour for global-local options is slightly different
between string and number-based options.

                                                        :setg :setglobal
:setg[lobal][!] ...     Like ":set" but set only the global value for a local
                        option without changing the local value.
                        When displaying an option, the global value is shown.
                        With the "all" argument: display global values for all
                        local options.
                        Without argument: display global values for all local
                        options which are different from the default.

For buffer-local and window-local options:
        Command          global value     local value          condition
      :set option=value      set              set
 :setlocal option=value       -               set
:setglobal option=value      set               -
      :set option?            -              display     local value is set
      :set option?          display            -         local value is not set
 :setlocal option?            -              display
:setglobal option?          display            -


Global options with a local value                       global-local

Options are global when you mostly use one value for all buffers and windows.
For some global options it's useful to sometimes have a different local value.
You can set the local value with ":setlocal".  That buffer or window will then
use the local value, while other buffers and windows continue using the global
value.

For example, you have two windows, both on C source code.  They use the global
'makeprg' option.  If you do this in one of the two windows:
        :set makeprg=gmake
then the other window will switch to the same value.  There is no need to set
the 'makeprg' option in the other C source window too.
However, if you start editing a Perl file in a new window, you want to use
another 'makeprg' for it, without changing the value used for the C source
files.  You use this command:
        :setlocal makeprg=perlmake
You can switch back to using the global value by making the local value empty:
        :setlocal makeprg=
This only works for a string option.  For a number or boolean option you need
to use the "<" flag, like this:
        :setlocal autoread<
Note that for non-boolean and non-number options using "<" copies the global
value to the local value, it doesn't switch back to using the global value
(that matters when the global value changes later).  You can also use:
        :set path<
This will make the local value of 'path' empty, so that the global value is
used.  Thus it does the same as:
        :setlocal path=
Note: In the future more global options can be made global-local.  Using
":setlocal" on a global option might work differently then.

                                                option-value-function
Some options ('completefunc''findfunc''imactivatefunc''imstatusfunc',
'omnifunc''operatorfunc''quickfixtextfunc''tagfunc' and 'thesaurusfunc')
are set to a function name or a function reference or a lambda function.  When
using a lambda it will be converted to the name, e.g. "<lambda>123".
Examples:

        set opfunc=MyOpFunc
        set opfunc=function('MyOpFunc')
        set opfunc=funcref('MyOpFunc')
        set opfunc={a\ ->\ MyOpFunc(a)}

Set to a script-local function:
        set opfunc=s:MyLocalFunc
        set opfunc=<SID>MyLocalFunc
In Vim9 script the "s:" and "<SID>" can be omitted if the function exists in
the script:
        set opfunc=MyLocalFunc

Set using a funcref variable:
        let Fn = function('MyTagFunc')
        let &tagfunc = Fn

Set using a lambda expression:
        let &tagfunc = {t -> MyTagFunc(t)}

Set using a variable with lambda expression:
        let L = {a, b, c -> MyTagFunc(a, b , c)}
        let &tagfunc = L

In Vim9 script, in a compiled function, you can use a lambda, but a
closure does not work, because the function will be called without the
context of where it was defined.


Setting the filetype

:setf[iletype] [FALLBACK] {filetype}                    :setf :setfiletype
                        Set the 'filetype' option to {filetype}, but only if
                        not done yet in a sequence of (nested) autocommands.
                        This is short for:
                                :if !did_filetype()
                                :  setlocal filetype={filetype}
                                :endif
                        This command is used in a filetype.vim file to avoid
                        setting the 'filetype' option twice, causing different
                        settings and syntax files to be loaded.

                        When the optional FALLBACK argument is present, a
                        later :setfiletype command will override the
                        'filetype'.  This is to be used for filetype
                        detections that are just a guess.  did_filetype()
                        will return false after this command.

                                option-window optwin
:bro[wse] se[t]                 :set-browse :browse-set :opt :options
:opt[ions]              Open a window for viewing and setting all options.
                        Options are grouped by function.
                        Offers short help for each option.  Hit <CR> on the
                        short help to open a help window with more help for
                        the option.
                        Modify the value of the option and hit <CR> on the
                        "set" line to set the new value.  For window and
                        buffer specific options, the last accessed window is
                        used to set the option value in, unless this is a help
                        window, in which case the window below help window is
                        used (skipping the option-window).
                        {not available when compiled without the +eval
                        feature}

                                                                $HOME
Using "~" is like using "$HOME", but it is only recognized at the start of an
option and after a space or comma.

On Unix systems "~user" can be used too.  It is replaced by the home directory
of user "user".  Example:
    :set path=~mool/include,/usr/include,.

On Unix systems the form "${HOME}" can be used too.  The name between {} can
contain non-id characters then.  Note that if you want to use this for the
"gf" command, you need to add the '{' and '}' characters to 'isfname'.

NOTE: expanding environment variables and "~/" is only done with the ":set"
command, not when assigning a value to an option with ":let".

                                                        $HOME-windows
On MS-Windows, if $HOME is not defined as an environment variable, then
at runtime Vim will set it to the expansion of $HOMEDRIVE$HOMEPATH.
If $HOMEDRIVE is not set then $USERPROFILE is used.

This expanded value is not exported to the environment, this matters when
running an external command:
        :echo system('set | findstr ^HOME=')
and
        :echo luaeval('os.getenv("HOME")')
should echo nothing (an empty string) despite exists('$HOME') being true.
When setting $HOME to a non-empty string it will be exported to the
subprocesses.


Note the maximum length of an expanded option is limited.  How much depends on
the system, mostly it is something like 256 or 1024 characters.

                                                        :fix :fixdel
:fix[del]               Set the value of 't_kD':
                                't_kb' is     't_kD' becomes
                                  CTRL-?        CTRL-H
                                not CTRL-?      CTRL-?

                        (CTRL-? is 0o177 octal, 0x7f hex)

                        If your delete key terminal code is wrong, but the
                        code for backspace is alright, you can put this in
                        your .vimrc:
                                :fixdel
                        This works no matter what the actual code for
                        backspace is.

                        If the backspace key terminal code is wrong you can
                        use this:
                                :if &term == "termname"
                                :  set t_kb=^V<BS>
                                :  fixdel
                                :endif
                        Where "^V" is CTRL-V and "<BS>" is the backspace key
                        (don't type four characters!).  Replace "termname"
                        with your terminal name.

                        If your <Delete> key sends a strange key sequence (not
                        CTRL-? or CTRL-H) you cannot use ":fixdel".  Then use:
                                :if &term == "termname"
                                :  set t_kD=^V<Delete>
                                :endif
                        Where "^V" is CTRL-V and "<Delete>" is the delete key
                        (don't type eight characters!).  Replace "termname"
                        with your terminal name.

                                                        Linux-backspace
                        Note about Linux: By default the backspace key
                        produces CTRL-?, which is wrong.  You can fix it by
                        putting this line in your rc.local:
                                echo "keycode 14 = BackSpace" | loadkeys

                                                        NetBSD-backspace
                        Note about NetBSD: If your backspace doesn't produce
                        the right code, try this:
                                xmodmap -e "keycode 22 = BackSpace"
                        If this works, add this in your .Xmodmap file:
                                keysym 22 = BackSpace
                        You need to restart for this to take effect.

==============================================================================
2. Automatically setting options                        auto-setting

Besides changing options with the ":set" command, there are three alternatives
to set options automatically for one or more files:

1. When starting Vim initializations are read from various places.  See
   initialization.  Most of them are performed for all editing sessions,
   and some of them depend on the directory where Vim is started.
   You can create an initialization file with :mkvimrc:mkview and
   :mksession.
2. If you start editing a new file, the automatic commands are executed.
   This can be used to set options for files matching a particular pattern and
   many other things.  See autocommand.
3. If you start editing a new file, and the 'modeline' option is on, a
   number of lines at the beginning and end of the file are checked for
   modelines.  This is explained here.

                                        modeline vim: vi: ex: E520
There are two forms of modelines.  The first form:
        [text{white}]{vi:|vim:|ex:}[white]{options}

[text{white}]           empty or any text followed by at least one blank
                        character (<Space> or <Tab>); "ex:" always requires at
                        least one blank character
{vi:|vim:|ex:}          the string "vi:", "vim:" or "ex:"
[white]                 optional white space
{options}               a list of option settings, separated with white space
                        or ':', where each part between ':' is the argument
                        for a ":set" command (can be empty)

Examples:
   vi:noai:sw=3 ts=6
   vim: tw=77

The second form (this is compatible with some versions of Vi):

        [text{white}]{vi:|vim:|Vim:|ex:}[white]se[t] {options}:[text]

[text{white}]           empty or any text followed by at least one blank
                        character (<Space> or <Tab>); "ex:" always requires at
                        least one blank character
{vi:|vim:|Vim:|ex:}     the string "vi:", "vim:", "Vim:" or "ex:"
[white]                 optional white space
se[t]                   the string "set " or "se " (note the space); When
                        "Vim" is used it must be "set".
{options}               a list of options, separated with white space, which
                        is the argument for a ":set" command
:                       a colon
[text]                  any text or empty

Examples:
   /* vim: set ai tw=75: */
   /* Vim: set ai tw=75: */

The white space before {vi:|vim:|Vim:|ex:} is required.  This minimizes the
chance that a normal word like "lex:" is caught.  There is one exception:
"vi:" and "vim:" can also be at the start of the line (for compatibility with
version 3.0).  Using "ex:" at the start of the line will be ignored (this
could be short for "example:").

If the modeline is disabled within a modeline, subsequent modelines will be
ignored.  This is to allow turning off modeline on a per-file basis.  This is
useful when a line looks like a modeline but isn't.  For example, it would be
good to start a YAML file containing strings like "vim:" with
    # vim: nomodeline
so as to avoid modeline misdetection.  Following options on the same line
after modeline deactivation, if any, are still evaluated (but you would
normally not have any).

                                                        modeline-local
The options are set like with ":setlocal": The new value only applies to the
buffer and window that contain the file.  Although it's possible to set global
options from a modeline, this is unusual.  If you have two windows open and
the files in it set the same global option to a different value, the result
depends on which one was opened last.

When editing a file that was already loaded, only the window-local options
from the modeline are used.  Thus if you manually changed a buffer-local
option after opening the file, it won't be changed if you edit the same buffer
in another window.  But window-local options will be set.

                                                        modeline-version
If the modeline is only to be used for some versions of Vim, the version
number can be specified where "vim:" or "Vim:" is used:
        vim{vers}:      version {vers} or later
        vim<{vers}:     version before {vers}
        vim={vers}:     version {vers}
        vim>{vers}:     version after {vers}
{vers} is 700 for Vim 7.0 (hundred times the major version plus minor).
For example, to use a modeline only for Vim 7.0:
        /* vim700: set foldmethod=marker */
To use a modeline for Vim after version 7.2:
        /* vim>702: set cole=2: */
There can be no blanks between "vim" and the ":".


The number of lines that are checked can be set with the 'modelines' option.
If 'modeline' is off or 'modelines' is 0 no lines are checked.

Note that for the first form all of the rest of the line is used, thus a line
like:
   /* vi:ts=4: */
will give an error message for the trailing "*/".  This line is OK:
   /* vi:set ts=4: */

If an error is detected the rest of the line is skipped.

If you want to include a ':' in a set command precede it with a '\'.  The
backslash in front of the ':' will be removed.  Example:
   /* vi:set fillchars=stl\:^,vert\:\|: */
This sets the 'fillchars' option to "stl:^,vert:\|".  Only a single backslash
before the ':' is removed.  Thus to include "\:" you have to specify "\\:".
                                                        E992
No other commands than "set" are supported, for security reasons (somebody
might create a Trojan horse text file with modelines).  And not all options
can be set.  For some options a flag is set, so that when the value is used
the sandbox is effective.  Some options can only be set from the modeline
when 'modelineexpr' is set (the default is off).

Still, there is always a small risk that a modeline causes trouble.  E.g.,
when some joker sets 'textwidth' to 5 all your lines are wrapped unexpectedly.
So disable modelines before editing untrusted text.  The mail ftplugin does
this, for example.

Hint: If you would like to do something else than setting an option, you could
define an autocommand that checks the file for a specific string.  For
example:
        au BufReadPost * if getline(1) =~ "VAR" | call SetVar() | endif
And define a function SetVar() that does something with the line containing
"VAR".

==============================================================================
3. Options summary                                      option-summary

In the list below all the options are mentioned with their full name and with
an abbreviation if there is one.  Both forms may be used.

In this document when a boolean option is "set" that means that ":set option"
is entered.  When an option is "reset", ":set nooption" is used.

For some options there are two default values: The "Vim default", which is
used when 'compatible' is not set, and the "Vi default", which is used when
'compatible' is set.

Most options are the same in all windows and buffers.  There are a few that
are specific to how the text is presented in a window.  These can be set to a
different value in each window.  For example the 'list' option can be set in
one window and reset in another for the same text, giving both types of view
at the same time.  There are a few options that are specific to a certain
file.  These can have a different value for each file or buffer.  For example
the 'textwidth' option can be 78 for a normal text file and 0 for a C
program.

        global                  one option for all buffers and windows
        local to window         each window has its own copy of this option
        local to buffer         each buffer has its own copy of this option

When creating a new window the option values from the currently active window
are used as a default value for the window-specific options.  For the
buffer-specific options this depends on the 's' and 'S' flags in the
'cpoptions' option.  If 's' is included (which is the default) the values for
buffer options are copied from the currently active buffer when a buffer is
first entered.  If 'S' is present the options are copied each time the buffer
is entered, this is almost like having global options.  If 's' and 'S' are not
present, the options are copied from the currently active buffer when the
buffer is created.

Hidden options                                          hidden-options

Not all options are supported in all versions.  This depends on the supported
features and sometimes on the system.  A remark about this is in curly braces
below.  When an option is not supported it may still be set without getting an
error, this is called a hidden option.  You can't get the value of a hidden
option though, it is not stored.

To test if option "foo" can be used with ":set" use something like this:
        if exists('&foo')
This also returns true for a hidden option.  To test if option "foo" is really
supported use something like this:
        if exists('+foo')

                                                        E355
A jump table for the options with a short description can be found at Q_op.

                                        'aleph' 'al' aleph Aleph
'aleph' 'al'            number  (default 128 for MS-Windows, 224 otherwise)
                        global
                        {only available when compiled with the +rightleft
                        feature}
        The ASCII code for the first letter of the Hebrew alphabet.  The
        routine that maps the keyboard in Hebrew mode, both in Insert mode
        (when hkmap is set) and on the command-line (when hitting CTRL-_)
        outputs the Hebrew characters in the range [aleph..aleph+26].
        aleph=128 applies to PC code, and aleph=224 applies to ISO 8859-8.
        See rileft.txt.

                        'allowrevins' 'ari' 'noallowrevins' 'noari'
'allowrevins' 'ari'     boolean (default off)
                        global
                        {only available when compiled with the +rightleft
                        feature}
        Allow CTRL-_ in Insert and Command-line mode.  This is default off, to
        avoid that users that accidentally type CTRL-_ instead of SHIFT-_ get
        into reverse Insert mode, and don't know how to get out.  See
        'revins'.
        NOTE: This option is reset when 'compatible' is set.

                         'altkeymap' 'akm' 'noaltkeymap' 'noakm'
'altkeymap' 'akm'       boolean (default off)
                        global
                        {only available when compiled with the +farsi
                        feature}
        This option was for using Farsi, which has been removed.  See
        farsi.txt.

                                                'ambiwidth' 'ambw'
'ambiwidth' 'ambw'      string (default: "single")
                        global
        Only effective when 'encoding' is "utf-8" or another Unicode encoding.
        Tells Vim what to do with characters with East Asian Width Class
        Ambiguous (such as Euro, Registered Sign, Copyright Sign, Greek
        letters, Cyrillic letters).

        There are currently two possible values:
        "single":       Use the same width as characters in US-ASCII.  This is
                        expected by most users.
        "double":       Use twice the width of ASCII characters.
                                                        E834 E835
        The value "double" cannot be used if 'listchars' or 'fillchars'
        contains a character that would be double width.  These errors may
        also be given when calling setcellwidths().

        The values are overruled for characters specified with
        setcellwidths().

        There are a number of CJK fonts for which the width of glyphs for
        those characters are solely based on how many octets they take in
        legacy/traditional CJK encodings.  In those encodings, Euro,
        Registered sign, Greek/Cyrillic letters are represented by two octets,
        therefore those fonts have "wide" glyphs for them.  This is also
        true of some line drawing characters used to make tables in text
        file.  Therefore, when a CJK font is used for GUI Vim or
        Vim is running inside a terminal (emulators) that uses a CJK font
        (or Vim is run inside an xterm invoked with "-cjkwidth" option.),
        this option should be set to "double" to match the width perceived
        by Vim with the width of glyphs in the font.  Perhaps it also has
        to be set to "double" under CJK MS-Windows when the system locale is
        set to one of CJK locales.  See Unicode Standard Annex #11
        (http://www.unicode.org/reports/tr11).

        Vim may set this option automatically at startup time when Vim is
        compiled with the +termresponse feature and if t_u7 is set to the
        escape sequence to request cursor position report.  The response can
        be found in v:termu7resp.

                        'antialias' 'anti' 'noantialias' 'noanti'
'antialias' 'anti'      boolean (default: off)
                        global
                        {only available when compiled with GUI enabled
                        on macOS}
        This option only has an effect in the GUI version of Vim on macOS
        v10.2 or later.  When on, Vim will use smooth ("antialiased") fonts,
        which can be easier to read at certain sizes on certain displays.
        Setting this option can sometimes cause problems if 'guifont' is set
        to its default (empty string).
        NOTE: This option is reset when 'compatible' is set.

                                'arabic' 'arab' 'noarabic' 'noarab'
'arabic' 'arab'         boolean (default off)
                        local to window
                        {only available when compiled with the +arabic
                        feature}
        This option can be set to start editing Arabic text.
        Setting this option will:
        - Set the 'rightleft' option, unless 'termbidi' is set.
        - Set the 'arabicshape' option, unless 'termbidi' is set.
        - Set the 'keymap' option to "arabic"; in Insert mode CTRL-^ toggles
          between typing English and Arabic key mapping.
        - Set the 'delcombine' option
        Note that 'encoding' must be "utf-8" for working with Arabic text.

        Resetting this option will:
        - Reset the 'rightleft' option.
        - Disable the use of 'keymap' (without changing its value).
        Note that 'arabicshape' and 'delcombine' are not reset (it is a global
        option).
        NOTE: This option is reset when 'compatible' is set.
        Also see arabic.txt.

                                        'arabicshape' 'arshape'
                                        'noarabicshape' 'noarshape'
'arabicshape' 'arshape' boolean (default on)
                        global
                        {only available when compiled with the +arabic
                        feature}
        When on and 'termbidi' is off, the required visual character
        corrections that need to take place for displaying the Arabic language
        take effect.  Shaping, in essence, gets enabled; the term is a broad
        one which encompasses:
          a) the changing/morphing of characters based on their location
             within a word (initial, medial, final and stand-alone).
          b) the enabling of the ability to compose characters
          c) the enabling of the required combining of some characters
        When disabled the display shows each character's true stand-alone
        form.
        Arabic is a complex language which requires other settings, for
        further details see arabic.txt.
        NOTE: This option is set when 'compatible' is set.

                        'autochdir' 'acd' 'noautochdir' 'noacd'
'autochdir' 'acd'       boolean (default off)
                        global
                        {only available when compiled with it, use
                        exists("+autochdir") to check}
        When on, Vim will change the current working directory whenever you
        open a file, switch buffers, delete a buffer or open/close a window.
        It will change to the directory containing the file which was opened
        or selected.  When a buffer has no name it also has no directory, thus
        the current directory won't change when navigating to it.
        Note: When this option is on some plugins may not work.

                        'autoindent' 'ai' 'noautoindent' 'noai'
'autoindent' 'ai'       boolean (default off)
                        local to buffer
        Copy indent from current line when starting a new line (typing <CR>
        in Insert mode or when using the "o" or "O" command).  If you do not
        type anything on the new line except <BS> or CTRL-D and then type
        <Esc>CTRL-O or <CR>, the indent is deleted again.  Moving the cursor
        to another line has the same effect, unless the 'I' flag is included
        in 'cpoptions'.
        When autoindent is on, formatting (with the "gq" command or when you
        reach 'textwidth' in Insert mode) uses the indentation of the first
        line.
        When 'smartindent' or 'cindent' is on the indent is changed in
        a different way.
        The 'autoindent' option is reset when the 'paste' option is set and
        restored when 'paste' is reset.

                                 'autoread' 'ar' 'noautoread' 'noar'
'autoread' 'ar'         boolean (default off)
                        global or local to buffer global-local
        When a file has been detected to have been changed outside of Vim and
        it has not been changed inside of Vim, automatically read it again.
        When the file has been deleted this is not done, so you have the text
        from before it was deleted.  When it appears again then it is read.
        timestamp
        If this option has a local value, use this command to switch back to
        using the global value:
                :set autoread<


                        'autoshelldir' 'asd' 'noautoshelldir' 'noasd'
'autoshelldir' 'asd'    boolean (default off)
                        global
        When on, Vim will change the current working directory whenever you
        change the directory of the shell running in a terminal window. You
        need proper setting-up, so whenever the shell's pwd changes an OSC 7
        escape sequence will be emitted.  For example, on Linux, you can
        source /etc/profile.d/vte.sh in your shell profile if you use bash or
        zsh.  For bash this should work (put it in a bash init file):
                if [[ -n "$VIM_TERMINAL" ]]; then
                    PROMPT_COMMAND='_vim_sync_PWD'
                    function _vim_sync_PWD() {
                        printf '\033]7;file://%s\033\\' "$PWD"
                    }
                fi

        Or, in a zsh init file:
                if [[ -n "$VIM_TERMINAL" ]]; then
                    autoload -Uz add-zsh-hook
                    add-zsh-hook -Uz chpwd _vim_sync_PWD
                    function _vim_sync_PWD() {
                        printf '\033]7;file://%s\033\\' "$PWD"
                    }
                fi

        In a fish init file:
                if test -n "$VIM_TERMINAL"
                    function _vim_sync_PWD --on-variable=PWD
                        printf '\033]7;file://%s\033\\' "$PWD"
                    end
                end

        You can find an alternative method at terminal-autoshelldir.
        When the parsing of the OSC sequence fails you get E1179 .

                                 'autowrite' 'aw' 'noautowrite' 'noaw'
'autowrite' 'aw'        boolean (default off)
                        global
        Write the contents of the file, if it has been modified, on each
        :next:rewind:last:first:previous:stop,
        :suspend:tag:!:makeCTRL-] and CTRL-^ command; and when
        a :bufferCTRL-OCTRL-I, '{A-Z0-9}, or `{A-Z0-9} command takes one
        to another file.
        A buffer is not written if it becomes hidden, e.g. when 'bufhidden' is
        set to "hide" and :next is used.
        Note that for some commands the 'autowrite' option is not used, see
        'autowriteall' for that.
        Some buffers will not be written, specifically when 'buftype' is
        "nowrite", "nofile", "terminal" or "prompt".
        USE WITH CARE: If you make temporary changes to a buffer that you
        don't want to be saved this option may cause it to be saved anyway.
        Renaming the buffer with ":file {name}" may help avoid this.

                         'autowriteall' 'awa' 'noautowriteall' 'noawa'
'autowriteall' 'awa'    boolean (default off)
                        global
        Like 'autowrite', but also used for commands ":edit", ":enew", ":quit",
        ":qall", ":exit", ":xit", ":recover" and closing the Vim window.
        Setting this option also implies that Vim behaves like 'autowrite' has
        been set.

                                                        'background' 'bg'
'background' 'bg'       string  (default "dark" or "light", see below)
                        global
        When set to "dark", Vim will try to use colors that look good on a
        dark background.  When set to "light", Vim will try to use colors that
        look good on a light background.  Any other value is illegal.
        Vim tries to set the default value according to the terminal used.
        This will not always be correct.
        Setting this option does not change the background color, it tells Vim
        what the background color looks like.  For changing the background
        color, see :hi-normal.

        When 'background' is changed Vim will adjust the default color groups
        for the new value.  But the colors used for syntax highlighting will
        not change.                                     g:colors_name
        When a color scheme is loaded (the "g:colors_name" variable is set)
        changing 'background' will cause the color scheme to be reloaded.  If
        the color scheme adjusts to the value of 'background' this will work.
        However, if the color scheme sets 'background' itself the effect may
        be undone.  First delete the "g:colors_name" variable when needed.

        When setting 'background' to the default value with:
                :set background&
        Vim will guess the value.  In the GUI this should work correctly,
        in other cases Vim might not be able to guess the right value.
        If the GUI supports a dark theme, you can use the "d" flag in
        'guioptions', see 'go-d'.

        When the t_RB option is set, Vim will use it to request the background
        color from the terminal.  If the returned RGB value is dark/light and
        'background' is not dark/light, 'background' will be set and the
        screen is redrawn.  This may have side effects, make t_BG empty in
        your .vimrc if you suspect this problem.  The response to t_RB can
        be found in v:termrbgresp.

        When starting the GUI, the default value for 'background' will be
        "light".  When the value is not set in the .gvimrc, and Vim detects
        that the background is actually quite dark, 'background' is set to
        "dark".  But this happens only AFTER the .gvimrc file has been read
        (because the window needs to be opened to find the actual background
        color).  To get around this, force the GUI window to be opened by
        putting a ":gui" command in the .gvimrc file, before where the value
        of 'background' is used (e.g., before ":syntax on").

        For MS-Windows the default is "dark".
        For other systems "dark" is used when 'term' is "linux",
        "screen.linux", "cygwin" or "putty", or $COLORFGBG suggests a dark
        background.  Otherwise the default is "light".

        The :terminal command and the term_start() function use the
        'background' value to decide whether the terminal window will start
        with a white or black background.

        Normally this option would be set in the .vimrc file.  Possibly
        depending on the terminal name.  Example:
                :if &term == "pcterm"
                :  set background=dark
                :endif
        When this option is set, the default settings for the highlight groups
        will change.  To use other settings, place ":highlight" commands AFTER
        the setting of the 'background' option.
        This option is also used in the "$VIMRUNTIME/syntax/syntax.vim" file
        to select the colors for syntax highlighting.  After changing this
        option, you must load syntax.vim again to see the result.  This can be
        done with ":syntax on".

                                                        'backspace' 'bs'
'backspace' 'bs'        string  (Vim default: "indent,eol,start",
                                 Vi default:  "")
                        global
        Influences the working of <BS><Del>CTRL-W and CTRL-U in Insert
        mode.  This is a list of items, separated by commas.  Each item allows
        a way to backspace over something:
        value   effect
        indent  allow backspacing over autoindent
        eol     allow backspacing over line breaks (join lines)
        start   allow backspacing over the start of insert; CTRL-W and CTRL-U
                stop once at the start of insert.
        nostop  like start, except CTRL-W and CTRL-U do not stop at the start of
                insert.

        When the value is empty, Vi compatible backspacing is used, none of
        the ways mentioned for the items above are possible.

        For backwards compatibility with version 5.4 and earlier:
        value   effect
          0     same as ":set backspace=" (Vi compatible)
          1     same as ":set backspace=indent,eol"
          2     same as ":set backspace=indent,eol,start"
          3     same as ":set backspace=indent,eol,nostop"

        See :fixdel if your <BS> or <Del> key does not do what you want.
        NOTE: This option is set to "" when 'compatible' is set.

                                'backup' 'bk' 'nobackup' 'nobk'
'backup' 'bk'           boolean (default off)
                        global
        Make a backup before overwriting a file.  Leave it around after the
        file has been successfully written.  If you do not want to keep the
        backup file, but you do want a backup while the file is being
        written, reset this option and set the 'writebackup' option (this is
        the default).  If you do not want a backup file at all reset both
        options (use this if your file system is almost full).  See the
        backup-table for more explanations.
        When the 'backupskip' pattern matches, a backup is not made anyway.
        When 'patchmode' is set, the backup may be renamed to become the
        oldest version of a file.
        NOTE: This option is reset when 'compatible' is set.

                                                'backupcopy' 'bkc'
'backupcopy' 'bkc'      string  (Vi default for Unix: "yes", otherwise: "auto")
                        global or local to buffer global-local
        When writing a file and a backup is made, this option tells how it's
        done.  This is a comma-separated list of words.

        The main values are:
        "yes"   make a copy of the file and overwrite the original one
        "no"    rename the file and write a new one
        "auto"  one of the previous, what works best

        Extra values that can be combined with the ones above are:
        "breaksymlink"  always break symlinks when writing
        "breakhardlink" always break hardlinks when writing

        Making a copy and overwriting the original file:
        - Takes extra time to copy the file.
        + When the file has special attributes, is a (hard/symbolic) link or
          has a resource fork, all this is preserved.
        - When the file is a link the backup will have the name of the link,
          not of the real file.

        Renaming the file and writing a new one:
        + It's fast.
        - Sometimes not all attributes of the file can be copied to the new
          file.
        - When the file is a link the new file will not be a link.

        The "auto" value is the middle way: When Vim sees that renaming the
        file is possible without side effects (the attributes can be passed on
        and the file is not a link) that is used.  When problems are expected,
        a copy will be made.

        The "breaksymlink" and "breakhardlink" values can be used in
        combination with any of "yes", "no" and "auto".  When included, they
        force Vim to always break either symbolic or hard links by doing
        exactly what the "no" option does, renaming the original file to
        become the backup and writing a new file in its place.  This can be
        useful for example in source trees where all the files are symbolic or
        hard links and any changes should stay in the local source tree, not
        be propagated back to the original source.
                                                                crontab
        One situation where "no" and "auto" will cause problems: A program
        that opens a file, invokes Vim to edit that file, and then tests if
        the open file was changed (through the file descriptor) will check the
        backup file instead of the newly created file.  "crontab -e" is an
        example, as are several file-watcher daemons like inotify.  In that
        case you probably want to switch this option.

        When a copy is made, the original file is truncated and then filled
        with the new text.  This means that protection bits, owner and
        symbolic links of the original file are unmodified.  The backup file,
        however, is a new file, owned by the user who edited the file.  The
        group of the backup is set to the group of the original file.  If this
        fails, the protection bits for the group are made the same as for
        others.

        When the file is renamed, this is the other way around: The backup has
        the same attributes of the original file, and the newly written file
        is owned by the current user.  When the file was a (hard/symbolic)
        link, the new file will not!  That's why the "auto" value doesn't
        rename when the file is a link.  The owner and group of the newly
        written file will be set to the same ones as the original file, but
        the system may refuse to do this.  In that case the "auto" value will
        again not rename the file.

        NOTE: This option is set to the Vi default value when 'compatible' is
        set and to the Vim default value when 'compatible' is reset.

                                                'backupdir' 'bdir'
'backupdir' 'bdir'      string  (default for Amiga: ".,t:",
                                 for Win32: ".,$TEMP,c:/tmp,c:/temp"
                                 for Unix: ".,~/tmp,~/")
                        global
        List of directories for the backup file, separated with commas.
        - The backup file will be created in the first directory in the list
          where this is possible.  The directory must exist, Vim will not
          create it for you.
        - Empty means that no backup file will be created ('patchmode' is
          impossible!).  Writing may fail because of this.
        - A directory "." means to put the backup file in the same directory
          as the edited file.
        - A directory starting with "./" (or ".\" for MS-Windows) means to put
          the backup file relative to where the edited file is.  The leading
          "." is replaced with the path name of the edited file.
          ("." inside a directory name has no special meaning).
        - Spaces after the comma are ignored, other spaces are considered part
          of the directory name.  To have a space at the start of a directory
          name, precede it with a backslash.
        - To include a comma in a directory name precede it with a backslash.
        - A directory name may end in an '/'.
        - For Unix and Win32, if a directory ends in two path separators "//",
          the backup file name will be built from the complete path to the
          file with all path separators changed to percent '%' signs. This
          will ensure file name uniqueness in the backup directory.
          On Win32, it is also possible to end with "\\".  However, When a
          separating comma is following, you must use "//", since "\\" will
          include the comma in the file name. Therefore it is recommended to
          use '//', instead of '\\'.
        - Environment variables are expanded :set_env.
        - Careful with '\' characters, type one before a space, type two to
          get one in the option (see option-backslash), for example:
            :set bdir=c:\\tmp,\ dir\\,with\\,commas,\\\ dir\ with\ spaces
        - For backwards compatibility with Vim version 3.0 a '>' at the start
          of the option is removed.
        See also 'backup' and 'writebackup' options.
        If you want to hide your backup files on Unix, consider this value:
                :set backupdir=./.backup,~/.backup,.,/tmp
        You must create a ".backup" directory in each directory and in your
        home directory for this to work properly.
        The use of :set+= and :set-= is preferred when adding or removing
        directories from the list.  This avoids problems when a future version
        uses another default.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                                'backupext' 'bex' E589
'backupext' 'bex'       string  (default "~", for VMS: "_")
                        global
        String which is appended to a file name to make the name of the
        backup file.  The default is quite unusual, because this avoids
        accidentally overwriting existing files with a backup file.  You might
        prefer using ".bak", but make sure that you don't have files with
        ".bak" that you want to keep.
        Only normal file name characters can be used; "/\*?[|<>" are illegal.

        If you like to keep a lot of backups, you could use a BufWritePre
        autocommand to change 'backupext' just before writing the file to
        include a timestamp.
                :au BufWritePre * let &bex = '-' .. strftime("%Y%b%d%X") .. '~'
        Use 'backupdir' to put the backup in a different directory.

                                                'backupskip' 'bsk'
'backupskip' 'bsk'      string  (default: "$TMPDIR/*,$TMP/*,$TEMP/*"
                                 Unix: "/tmp/*,$TMPDIR/*,$TMP/*,$TEMP/*"
                                 Mac: "/private/tmp/*,$TMPDIR/*,$TMP/*,$TEMP/*")
                        global
        A list of file patterns.  When one of the patterns matches with the
        name of the file which is written, no backup file is created.  Both
        the specified file name and the full path name of the file are used.
        The pattern is used like with :autocmd, see autocmd-patterns.
        Watch out for special characters, see option-backslash.
        When $TMPDIR, $TMP or $TEMP is not defined, it is not used for the
        default value.  "/tmp/*" is only used for Unix.

        WARNING: Not having a backup file means that when Vim fails to write
        your buffer correctly and then, for whatever reason, Vim exits, you
        lose both the original file and what you were writing.  Only disable
        backups if you don't care about losing the file.

        Note that environment variables are not expanded.  If you want to use
        $HOME you must expand it explicitly, e.g.:
                :let &backupskip = escape(expand('$HOME'), '\') .. '/tmp/*'

        Note that the default also makes sure that "crontab -e" works (when a
        backup would be made by renaming the original file crontab won't see
        the newly created file).  Also see 'backupcopy' and crontab.

                                                'balloondelay' 'bdlay'
'balloondelay' 'bdlay'  number  (default: 600)
                        global
                        {only available when compiled with the +balloon_eval
                        feature}
        Delay in milliseconds before a balloon may pop up.  See balloon-eval.

                       'ballooneval' 'beval' 'noballooneval' 'nobeval'
'ballooneval' 'beval'   boolean (default off)
                        global
                        {only available when compiled with the +balloon_eval
                        feature}
        Switch on the balloon-eval functionality for the GUI.

                       'balloonevalterm' 'bevalterm' 'noballoonevalterm'
                       'nobevalterm'
'balloonevalterm' 'bevalterm'   boolean (default off)
                        global
                        {only available when compiled with the
                        +balloon_eval_term feature}
        Switch on the balloon-eval functionality for the terminal.

                                                     'balloonexpr' 'bexpr'
'balloonexpr' 'bexpr'   string  (default "")
                        global or local to buffer global-local
                        {only available when compiled with the +balloon_eval
                        feature}
        Expression for text to show in evaluation balloon.  It is only used
        when 'ballooneval' or 'balloonevalterm' is on.  These variables can be
        used:

        v:beval_bufnr   number of the buffer in which balloon is going to show
        v:beval_winnr   number of the window
        v:beval_winid   ID of the window
        v:beval_lnum    line number
        v:beval_col     column number (byte index)
        v:beval_text    word under or after the mouse pointer

        Instead of showing a balloon, which is limited to plain text, consider
        using a popup window, see popup_beval_example.  A popup window can
        use highlighting and show a border.

        The evaluation of the expression must not have side effects!
        Example:
    function MyBalloonExpr()
        return 'Cursor is at line ' .. v:beval_lnum ..
                \ ', column ' .. v:beval_col ..
                \ ' of file ' ..  bufname(v:beval_bufnr) ..
                \ ' on word "' .. v:beval_text .. '"'
    endfunction
    set bexpr=MyBalloonExpr()
    set ballooneval balloonevalterm

        Also see balloon_show(), it can be used if the content of the balloon
        is to be fetched asynchronously.  In that case evaluating
        'balloonexpr' should result in an empty string.  If you get a balloon
        with only "0" you probably didn't return anything from your function.

        NOTE: The balloon is displayed only if the cursor is on a text
        character.  If the result of evaluating 'balloonexpr' is not empty,
        Vim does not try to send a message to an external debugger (Netbeans
        or Sun Workshop).

        If the expression starts with s: or <SID>, then it is replaced with
        the script ID (local-function). Example:
                set bexpr=s:MyBalloonExpr()
                set bexpr=<SID>SomeBalloonExpr()
        Otherwise, the expression is evaluated in the context of the script
        where the option was set, thus script-local items are available.

        The expression will be evaluated in the sandbox when set from a
        modeline, see sandbox-option.
        This option cannot be set in a modeline when 'modelineexpr' is off.

        It is not allowed to change text or jump to another window while
        evaluating 'balloonexpr', see textlock.

        To check whether line breaks in the balloon text work use this check:
                if has("balloon_multiline")
        When they are supported "\n" characters will start a new line.  If the
        expression evaluates to a List this is equal to using each List item
        as a string and putting "\n" in between them.
        NOTE: This option is set to "" when 'compatible' is set.

                                                'belloff' 'bo'
'belloff' 'bo'          string  (default "")
                        global
        Specifies for which events the bell will not be rung. It is a comma
        separated list of items. For each item that is present, the bell
        will be silenced. This is most useful to specify specific events in
        insert mode to be silenced.
        You can also make it flash by using 'visualbell'.

        item        meaning when present
        all         All events.
        backspace   When hitting <BS> or <Del> and deleting results in an
                    error.
        cursor      Fail to move around using the cursor keys or
                    <PageUp>/<PageDown> in Insert-mode.
        complete    Error occurred when using i_CTRL-X_CTRL-K or
                    i_CTRL-X_CTRL-T.
        copy        Cannot copy char from insert mode using i_CTRL-Y or
                    i_CTRL-E.
        ctrlg       Unknown Char after <C-G> in Insert mode.
        error       Other Error occurred (e.g. try to join last line)
                    (mostly used in Normal-mode or Cmdline-mode).
        esc         hitting <Esc> in Normal-mode.
        ex          In Visual-mode, hitting Q results in an error.
        hangul      Ignored.
        insertmode  Pressing <Esc> in 'insertmode'.
        lang        Calling the beep module for Lua/Mzscheme/TCL.
        mess        No output available for g<.
        showmatch   Error occurred for 'showmatch' function.
        operator    Empty region error cpo-E.
        register    Unknown register after <C-R> in Insert-mode.
        shell       Bell from shell output :!.
        spell       Error happened on spell suggest.
        term        Bell from :terminal output.
        wildmode    More matches in cmdline-completion available
                    (depends on the 'wildmode' setting).

        This is most useful to fine tune when in Insert mode the bell should
        be rung. For Normal mode and Ex commands, the bell is often rung to
        indicate that an error occurred. It can be silenced by adding the
        "error" keyword.

                                     'binary' 'bin' 'nobinary' 'nobin'
'binary' 'bin'          boolean (default off)
                        local to buffer
        This option should be set before editing a binary file.  You can also
        use the -b Vim argument.  When this option is switched on a few
        options will be changed (also when it already was on):
                'textwidth'  will be set to 0
                'wrapmargin' will be set to 0
                'modeline'   will be off
                'expandtab'  will be off
        Also, 'fileformat' and 'fileformats' options will not be used, the
        file is read and written like 'fileformat' was "unix" (a single <NL>
        separates lines).
        The 'fileencoding' and 'fileencodings' options will not be used, the
        file is read without conversion.
        NOTE: When you start editing a(nother) file while the 'bin' option is
        on, settings from autocommands may change the settings again (e.g.,
        'textwidth'), causing trouble when editing.  You might want to set
        'bin' again when the file has been loaded.
        The previous values of these options are remembered and restored when
        'bin' is switched from on to off.  Each buffer has its own set of
        saved option values.
        To edit a file with 'binary' set you can use the ++bin argument.
        This avoids you have to do ":set bin", which would have effect for all
        files you edit.
        When writing a file the <EOL> for the last line is only written if
        there was one in the original file (normally Vim appends an <EOL> to
        the last line if there is none; this would make the file longer).  See
        the 'endofline' option.

                        'bioskey' 'biosk' 'nobioskey' 'nobiosk'
'bioskey' 'biosk'       boolean (default on)
                        global
                        {only for MS-DOS}
        This was for MS-DOS and is no longer supported.

                                                        'bomb' 'nobomb'
'bomb'                  boolean (default off)
                        local to buffer
        When writing a file and the following conditions are met, a BOM (Byte
        Order Mark) is prepended to the file:
        - this option is on
        - the 'binary' option is off
        - 'fileencoding' is "utf-8", "ucs-2", "ucs-4" or one of the little/big
          endian variants.
        Some applications use the BOM to recognize the encoding of the file.
        Often used for UCS-2 files on MS-Windows.  For other applications it
        causes trouble, for example: "cat file1 file2" makes the BOM of file2
        appear halfway through the resulting file.  Gcc doesn't accept a BOM.
        When Vim reads a file and 'fileencodings' starts with "ucs-bom", a
        check for the presence of the BOM is done and 'bomb' set accordingly.
        Unless 'binary' is set, it is removed from the first line, so that you
        don't see it when editing.  When you don't change the options, the BOM
        will be restored when writing the file.

                                                'breakat' 'brk'
'breakat' 'brk'         string  (default " ^I!@*-+;:,./?")
                        global
                        {not available when compiled without the +linebreak
                        feature}
        This option lets you choose which characters might cause a line
        break if 'linebreak' is on.  Only works for ASCII and also for 8-bit
        characters when 'encoding' is an 8-bit encoding.

                        'breakindent' 'bri' 'nobreakindent' 'nobri'
'breakindent' 'bri'     boolean (default off)
                        local to window
                        {not available when compiled without the +linebreak
                        feature}
        Every wrapped line will continue visually indented (same amount of
        space as the beginning of that line), thus preserving horizontal blocks
        of text.
        NOTE: This option is reset when 'compatible' is set.

                                                'breakindentopt' 'briopt'
'breakindentopt' 'briopt' string (default empty)
                        local to window
                        {not available when compiled without the +linebreak
                        feature}
        Settings for 'breakindent'. It can consist of the following optional
        items and must be separated by a comma:
                min:{n}     Minimum text width that will be kept after
                            applying 'breakindent', even if the resulting
                            text should normally be narrower. This prevents
                            text indented almost to the right window border
                            occupying lots of vertical space when broken.
                            (default: 20)
                shift:{n}   After applying 'breakindent', the wrapped line's
                            beginning will be shifted by the given number of
                            characters.  It permits dynamic French paragraph
                            indentation (negative) or emphasizing the line
                            continuation (positive).
                            (default: 0)
                sbr         Display the 'showbreak' value before applying the
                            additional indent.
                            (default: off)
                list:{n}    Adds an additional indent for lines that match a
                            numbered or bulleted list (using the
                            'formatlistpat' setting).
                            (default: 0)
                list:-1     Uses the width of a match with 'formatlistpat' for
                            indentation.
                column:{n}  Indent at column {n}. Will overrule the other
                            sub-options. Note: an additional indent may be
                            added for the 'showbreak' setting.
                            (default: off)

                                                'browsedir' 'bsdir'
'browsedir' 'bsdir'     string  (default: "last")
                        global
                        {only for Motif, GTK, Mac and Win32 GUI}
        Which directory to use for the file browser:
           last         Use same directory as with last file browser, where a
                        file was opened or saved.
           buffer       Use the directory of the related buffer.
           current      Use the current directory.
           {path}       Use the specified directory

                                                'bufhidden' 'bh'
'bufhidden' 'bh'        string (default: "")
                        local to buffer  local-noglobal
        This option specifies what happens when a buffer is no longer
        displayed in a window:
          <empty>       follow the global 'hidden' option
          hide          hide the buffer (don't unload it), even if 'hidden' is
                        not set
          unload        unload the buffer, even if 'hidden' is set; the
                        :hide command will also unload the buffer
          delete        delete the buffer from the buffer list, even if
                        'hidden' is set; the :hide command will also delete
                        the buffer, making it behave like :bdelete
          wipe          wipe the buffer from the buffer list, even if
                        'hidden' is set; the :hide command will also wipe
                        out the buffer, making it behave like :bwipeout

        CAREFUL: when "unload", "delete" or "wipe" is used changes in a buffer
        are lost without a warning.  Also, these values may break autocommands
        that switch between buffers temporarily.
        This option is used together with 'buftype' and 'swapfile' to specify
        special kinds of buffers.   See special-buffers.

                        'buflisted' 'bl' 'nobuflisted' 'nobl' E85
'buflisted' 'bl'        boolean (default: on)
                        local to buffer
        When this option is set, the buffer shows up in the buffer list.  If
        it is reset it is not used for ":bnext", "ls", the Buffers menu, etc.
        This option is reset by Vim for buffers that are only used to remember
        a file name or marks.  Vim sets it when starting to edit a buffer.
        But not when moving to a buffer with ":buffer".

                                                'buftype' 'bt' E382
'buftype' 'bt'          string (default: "")
                        local to buffer  local-noglobal
        The value of this option specifies the type of a buffer:
          <empty>       normal buffer
          nofile        buffer which is not related to a file and will not be
                        written
          nowrite       buffer which will not be written
          acwrite       buffer which will always be written with BufWriteCmd
                        autocommands.
          quickfix      quickfix buffer, contains list of errors :cwindow
                        or list of locations :lwindow
          help          help buffer (you are not supposed to set this
                        manually)
          terminal      buffer for a terminal (you are not supposed to set
                        this manually)
          prompt        buffer where only the last line can be edited, meant
                        to be used by a plugin, see prompt-buffer
                        {only when compiled with the +channel feature}
          popup         buffer used in a popup window, see popup.
                        {only when compiled with the +textprop feature}

        This option is used together with 'bufhidden' and 'swapfile' to
        specify special kinds of buffers.   See special-buffers.
        Also see win_gettype(), which returns the type of the window.

        Be careful with changing this option, it can have many side effects!
        One such effect is that Vim will not check the timestamp of the file,
        if the file is changed by another program this will not be noticed.

        A "quickfix" buffer is only used for the error list and the location
        list.  This value is set by the :cwindow and :lwindow commands and
        you are not supposed to change it.

        "nofile" and "nowrite" buffers are similar:
        both:           The buffer is not to be written to disk, ":w" doesn't
                        work (":w filename" does work though).
        both:           The buffer is never considered to be 'modified'.
                        There is no warning when the changes will be lost, for
                        example when you quit Vim.
        both:           A swap file is only created when using too much memory
                        (when 'swapfile' has been reset there is never a swap
                        file).
        nofile only:    The buffer name is fixed, it is not handled like a
                        file name.  It is not modified in response to a :cd
                        command.
        both:           When using ":e bufname" and already editing "bufname"
                        the buffer is made empty and autocommands are
                        triggered as usual for :edit.
                                                        E676
        "acwrite" implies that the buffer name is not related to a file, like
        "nofile", but it will be written.  Thus, in contrast to "nofile" and
        "nowrite", ":w" does work and a modified buffer can't be abandoned
        without saving.  For writing there must be matching BufWriteCmd,
        FileWriteCmd or FileAppendCmd autocommands.

                                                'casemap' 'cmp'
'casemap' 'cmp'         string  (default: "internal,keepascii")
                        global
        Specifies details about changing the case of letters.  It may contain
        these words, separated by a comma:
        internal        Use internal case mapping functions, the current
                        locale does not change the case mapping.  This only
                        matters when 'encoding' is a Unicode encoding,
                        "latin1" or "iso-8859-15".  When "internal" is
                        omitted, the towupper() and towlower() system library
                        functions are used when available.
        keepascii       For the ASCII characters (0x00 to 0x7f) use the US
                        case mapping, the current locale is not effective.
                        This probably only matters for Turkish.

                                'cdhome' 'cdh' 'nocdhome' 'nocdh'
'cdhome' 'cdh'          boolean (default: off)
                        global
        When on, :cd:tcd and :lcd without an argument changes the
        current working directory to the $HOME directory like in Unix.
        When off, those commands just print the current directory name.
        On Unix this option has no effect.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.
        NOTE: This option is reset when 'compatible' is set.

                                                'cdpath' 'cd' E344 E346
'cdpath' 'cd'           string  (default: equivalent to $CDPATH or ",,")
                        global
        This is a list of directories which will be searched when using the
        :cd:tcd and :lcd commands, provided that the directory being
        searched for has a relative path, not an absolute part starting with
        "/", "./" or "../", the 'cdpath' option is not used then.
        The 'cdpath' option's value has the same form and semantics as
        'path'.  Also see file-searching.
        The default value is taken from $CDPATH, with a "," prepended to look
        in the current directory first.
        If the default value taken from $CDPATH is not what you want, include
        a modified version of the following command in your vimrc file to
        override it:
          :let &cdpath = ',' .. substitute(substitute($CDPATH, '[, ]', '\\\0', 'g'), ':', ',', 'g')
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.
        (parts of 'cdpath' can be passed to the shell to expand file names).

                                                'cedit'
'cedit'                 string  (Vi default: "", Vim default: CTRL-F)
                        global
        The key used in Command-line Mode to open the command-line window.
        The default is CTRL-F when 'compatible' is off.
        Only non-printable keys are allowed.
        The key can be specified as a single character, but it is difficult to
        type.  The preferred way is to use key-notation (e.g. <Up><C-F>) or
        a letter preceded with a caret (e.g. ^F is CTRL-F).  Examples:
                :set cedit=^Y
                :set cedit=<Esc>
        Nvi also has this option, but it only uses the first character.
        See cmdwin.
        NOTE: This option is set to the Vim default value when 'compatible'
        is reset.

                                'charconvert' 'ccv' E202 E214 E513
'charconvert' 'ccv'     string (default "")
                        global
                        {only available when compiled with the +eval feature}
        An expression that is used for character encoding conversion.  It is
        evaluated when a file that is to be read or has been written has a
        different encoding from what is desired.
        'charconvert' is not used when the internal iconv() function is
        supported and is able to do the conversion.  Using iconv() is
        preferred, because it is much faster.
        'charconvert' is not used when reading stdin --, because there is no
        file to convert from.  You will have to save the text in a file first.
        The expression must return zero, false or an empty string for success,
        non-zero or true for failure.
        The possible encoding names encountered are in 'encoding'.
        Additionally, names given in 'fileencodings' and 'fileencoding' are
        used.
        Conversion between "latin1", "unicode", "ucs-2", "ucs-4" and "utf-8"
        is done internally by Vim, 'charconvert' is not used for this.
        'charconvert' is also used to convert the viminfo file, if the 'c'
        flag is present in 'viminfo'.  Also used for Unicode conversion.
        Example:
                set charconvert=CharConvert()
                fun CharConvert()
                  system("recode "
                        \ .. v:charconvert_from .. ".." .. v:charconvert_to
                        \ .. " <" .. v:fname_in .. " >" .. v:fname_out)
                  return v:shell_error
                endfun
        The related Vim variables are:
                v:charconvert_from      name of the current encoding
                v:charconvert_to        name of the desired encoding
                v:fname_in              name of the input file
                v:fname_out             name of the output file
        Note that v:fname_in and v:fname_out will never be the same.
        Note that v:charconvert_from and v:charconvert_to may be different
        from 'encoding'.  Vim internally uses UTF-8 instead of UCS-2 or UCS-4.

        The advantage of using a function call without arguments is that it is
        faster, see expr-option-function.

        Encryption is not done by Vim when using 'charconvert'.  If you want
        to encrypt the file after conversion, 'charconvert' should take care
        of this.

        If the 'charconvert' expression starts with s: or <SID>, then it is
        replaced with the script ID (local-function). Example:
                set charconvert=s:MyConvert()
                set charconvert=<SID>SomeConvert()
        Otherwise the expression is evaluated in the context of the script
        where the option was set, thus script-local items are available.

        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                   'cindent' 'cin' 'nocindent' 'nocin'
'cindent' 'cin'         boolean (default off)
                        local to buffer
        Enables automatic C program indenting.  See 'cinkeys' to set the keys
        that trigger reindenting in insert mode and 'cinoptions' to set your
        preferred indent style.
        If 'indentexpr' is not empty, it overrules 'cindent'.
        If 'lisp' is not on and both 'indentexpr' and 'equalprg' are empty,
        the "=" operator indents using this algorithm rather than calling an
        external program.
        See C-indenting.
        When you don't like the way 'cindent' works, try the 'smartindent'
        option or 'indentexpr'.
        This option is not used when 'paste' is set.
        NOTE: This option is reset when 'compatible' is set.

                                                        'cinkeys' 'cink'
'cinkeys' 'cink'        string  (default "0{,0},0),0],:,0#,!^F,o,O,e")
                        local to buffer
        A list of keys that, when typed in Insert mode, cause reindenting of
        the current line.  Only used if 'cindent' is on and 'indentexpr' is
        empty.
        For the format of this option see cinkeys-format.
        See C-indenting.

                                                'cinoptions' 'cino'
'cinoptions' 'cino'     string  (default "")
                        local to buffer
        The 'cinoptions' affect the way 'cindent' reindents lines in a C
        program.  See cinoptions-values for the values of this option, and
        C-indenting for info on C indenting in general.

                                                'cinscopedecls' 'cinsd'
'cinscopedecls' 'cinsd' string  (default "public,protected,private")
                        local to buffer
        Keywords that are interpreted as a C++ scope declaration by cino-g.
        Useful e.g. for working with the Qt framework that defines additional
        scope declarations "signals", "public slots" and "private slots":
                set cinscopedecls+=signals,public\ slots,private\ slots

                                                'cinwords' 'cinw'
'cinwords' 'cinw'       string  (default "if,else,while,do,for,switch")
                        local to buffer
        These keywords start an extra indent in the next line when
        'smartindent' or 'cindent' is set.  For 'cindent' this is only done at
        an appropriate place (inside {}).
        Note that 'ignorecase' isn't used for 'cinwords'.  If case doesn't
        matter, include the keyword both the uppercase and lowercase:
        "if,If,IF".

                                                'clipboard' 'cb'
'clipboard' 'cb'        string  (default "autoselect,exclude:cons\|linux"
                                                  for X-windows, "" otherwise)
                        global
                        {only in GUI versions or when the +xterm_clipboard
                        feature is included}
        This option is a list of comma-separated names.
        Note: if one of the items is "exclude:", then you can't add an item
        after that.  Therefore do not append an item with += but use ^= to
        prepend, e.g.:
                set clipboard^=unnamed
        When using the GUI see 'go-A'.
        These names are recognized:

                                                clipboard-unnamed
        unnamed         When included, Vim will use the clipboard register '*'
                        for all yank, delete, change and put operations which
                        would normally go to the unnamed register.  When a
                        register is explicitly specified, it will always be
                        used regardless of whether "unnamed" is in 'clipboard'
                        or not.  The clipboard register can always be
                        explicitly accessed using the "* notation.  Also see
                        gui-clipboard.

                                                clipboard-unnamedplus
        unnamedplus     A variant of the "unnamed" flag which uses the
                        clipboard register '+' (quoteplus) instead of
                        register '*' for all yank, delete, change and put
                        operations which would normally go to the unnamed
                        register.  When "unnamed" is also included to the
                        option, yank operations (but not delete, change or
                        put) will additionally copy the text into register
                        '*'.
                        Only available with the +X11 feature.
                        Availability can be checked with:
                                if has('unnamedplus')

                                                clipboard-autoselect
        autoselect      Works like the 'a' flag in 'guioptions': If present,
                        then whenever Visual mode is started, or the Visual
                        area extended, Vim tries to become the owner of the
                        windowing system's global selection or put the
                        selected text on the clipboard used by the selection
                        register "*.  See 'go-a' and quotestar for details.
                        When the GUI is active, the 'a' flag in 'guioptions'
                        is used, when the GUI is not active, this "autoselect"
                        flag is used.
                        Also applies to the modeless selection.

                                                clipboard-autoselectplus
        autoselectplus  Like "autoselect" but using the + register instead of
                        the * register.  Compare to the 'P' flag in
                        'guioptions'.

                                                clipboard-autoselectml
        autoselectml    Like "autoselect", but for the modeless selection
                        only.  Compare to the 'A' flag in 'guioptions'.

                                                clipboard-html
        html            When the clipboard contains HTML, use this when
                        pasting.  When putting text on the clipboard, mark it
                        as HTML.  This works to copy rendered HTML from
                        Firefox, paste it as raw HTML in Vim, select the HTML
                        in Vim and paste it in a rich edit box in Firefox.
                        You probably want to add this only temporarily,
                        possibly use BufEnter autocommands.
                        Only supported for GTK version 2 and later.

                                                clipboard-exclude
        exclude:{pattern}
                        Defines a pattern that is matched against the name of
                        the terminal 'term'.  If there is a match, no
                        connection will be made to the X server.  This is
                        useful in this situation:
                        - Running Vim in a console.
                        - $DISPLAY is set to start applications on another
                          display.
                        - You do not want to connect to the X server in the
                          console, but do want this in a terminal emulator.
                        To never connect to the X server use:
                                exclude:.*
                        This has the same effect as using the -X argument.
                        Note that when there is no connection to the X server
                        the window title won't be restored and the clipboard
                        cannot be accessed.
                        The value of 'magic' is ignored, {pattern} is
                        interpreted as if 'magic' was on.
                        The rest of the option value will be used for
                        {pattern}, this must be the last entry.

                                                'cmdheight' 'ch'
'cmdheight' 'ch'        number  (default 1)
                        global or local to tab page
        Number of screen lines to use for the command-line.  A larger value
        helps avoiding hit-enter prompts.
        The value of this option is stored with the tab page, so that each tab
        page can have a different value.

                                                'cmdwinheight' 'cwh'
'cmdwinheight' 'cwh'    number  (default 7)
                        global
        Number of screen lines to use for the command-line window. cmdwin

                                                'colorcolumn' 'cc'
'colorcolumn' 'cc'      string  (default "")
                        local to window
                        {not available when compiled without the +syntax
                        feature}
        'colorcolumn' is a comma-separated list of screen columns that are
        highlighted with ColorColumn hl-ColorColumn.  Useful to align
        text.  Will make screen redrawing slower.
        The screen column can be an absolute number, or a number preceded with
        '+' or '-', which is added to or subtracted from 'textwidth'.

                :set cc=+1        " highlight column after 'textwidth'
                :set cc=+1,+2,+3  " highlight three columns after 'textwidth'
                :hi ColorColumn ctermbg=lightgrey guibg=lightgrey

        When 'textwidth' is zero then the items with '-' and '+' are not used.
        A maximum of 256 columns are highlighted.

                                                'columns' 'co' E594
'columns' 'co'          number  (default 80 or terminal width)
                        global
        Number of columns of the screen.  Normally this is set by the terminal
        initialization and does not have to be set by hand.  Also see
        posix-screen-size.
        When Vim is running in the GUI or in a resizable window, setting this
        option will cause the window size to be changed.  When you only want
        to use the size for the GUI, put the command in your gvimrc file.
        When you set this option and Vim is unable to change the physical
        number of columns of the display, the display may be messed up.  For
        the GUI it is always possible and Vim limits the number of columns to
        what fits on the screen.  You can use this command to get the widest
        window possible:
                :set columns=9999
        Minimum value is 12, maximum value is 10000.

                                        'comments' 'com' E524 E525
'comments' 'com'        string  (default
                                "s1:/*,mb:*,ex:*/,://,b:#,:%,:XCOMM,n:>,fb:-")
                        local to buffer
        A comma-separated list of strings that can start a comment line.  See
        format-comments.  See option-backslash about using backslashes to
        insert a space.

                                        'commentstring' 'cms' E537
'commentstring' 'cms'   string  (default "/* %s */")
                        local to buffer
                        {not available when compiled without the +folding
                        feature}
        A template for a comment.  The "%s" in the value is replaced with the
        comment text, and should be padded with a space when possible.
        Currently used to add markers for folding, see fold-marker.  Also
        commonly used by commenting plugins (e.g. comment-install).

                        'compatible' 'cp' 'nocompatible' 'nocp'
'compatible' 'cp'       boolean (default on, off when a vimrc or gvimrc
                                        file is found, reset in defaults.vim)
                        global
        This option has the effect of making Vim either more Vi-compatible, or
        make Vim behave in a more useful way.

        This is a special kind of option, because when it's set or reset,
        other options are also changed as a side effect.
        NOTE: Setting or resetting this option can have a lot of unexpected
        effects: Mappings are interpreted in another way, undo behaves
        differently, etc.  If you set this option in your vimrc file, you
        should probably put it at the very start.

        By default this option is on and the Vi defaults are used for the
        options.  This default was chosen for those people who want to use Vim
        just like Vi, and don't even (want to) know about the 'compatible'
        option.
        When a vimrc or gvimrc file is found while Vim is starting up,
        this option is switched off, and all options that have not been
        modified will be set to the Vim defaults.  Effectively, this means
        that when a vimrc or gvimrc file exists, Vim will use the Vim
        defaults, otherwise it will use the Vi defaults.  (Note: This doesn't
        happen for the system-wide vimrc or gvimrc file, nor for a file given
        with the -u argument).  Also see compatible-default and
        posix-compliance.
        You can also set this option with the "-C" argument, and reset it with
        "-N".  See -C and -N.
        See 'cpoptions' for more fine tuning of Vi compatibility.

        When this option is set, numerous other options are set to make Vim as
        Vi-compatible as possible.  When this option is unset, various options
        are set to make Vim more useful.  The table below lists all the
        options affected.
        The {?} column indicates when the options are affected:
        +  Means that the option is set to the value given in {set value} when
           'compatible' is set.
        &  Means that the option is set to the value given in {set value} when
           'compatible' is set AND is set to its Vim default value when
           'compatible' is unset.
        -  Means the option is NOT changed when setting 'compatible' but IS
           set to its Vim default when 'compatible' is unset.
        The {effect} column summarises the change when 'compatible' is set.

        option          ? set value     effect

        'allowrevins'   + off           no CTRL-_ command
        'antialias'     + off           don't use antialiased fonts
        'arabic'        + off           reset arabic-related options
        'arabicshape'   + on            correct character shapes
        'backspace'     + ""            normal backspace
        'backup'        + off           no backup file
        'backupcopy'    & Unix: "yes"   backup file is a copy
                          else: "auto"  copy or rename backup file
        'balloonexpr'   + ""            text to show in evaluation balloon
        'breakindent'   + off           don't indent when wrapping lines
        'cedit'         - {unchanged}   {set vim default only on resetting 'cp'}
        'cdhome'        + off           ":cd" don't chdir to home on non-Unix
        'cindent'       + off           no C code indentation
        'compatible'    - {unchanged}   {set vim default only on resetting 'cp'}
        'copyindent'    + off           don't copy indent structure
        'cpoptions'     & (all flags)   Vi-compatible flags
        'cscopepathcomp'+ 0             don't show directories in tags list
        'cscoperelative'+ off           don't use basename of path as prefix
        'cscopetag'     + off           don't use cscope for ":tag"
        'cscopetagorder'+ 0             see cscopetagorder
        'cscopeverbose' + off           see cscopeverbose
        'delcombine'    + off           unicode: delete whole char combination
        'digraph'       + off           no digraphs
        'esckeys'       & off           no <Esc>-keys in Insert mode
                                        this also disables modifyOtherKeys
                                        and xterm-bracketed-paste
        'expandtab'     + off           tabs not expanded to spaces
        'fileformats'   & ""            no automatic file format detection,
                          "dos,unix"    except for MS-Windows
        'formatexpr'    + ""            use 'formatprg' for auto-formatting
        'formatoptions' & "vt"          Vi compatible formatting
        'gdefault'      + off           no default 'g' flag for ":s"
        'history'       & 0             no commandline history
        'hkmap'         + off           no Hebrew keyboard mapping
        'hkmapp'        + off           no phonetic Hebrew keyboard mapping
        'hlsearch'      + off           no highlighting of search matches
        'incsearch'     + off           no incremental searching
        'indentexpr'    + ""            no indenting by expression
        'insertmode'    + off           do not start in Insert mode
        'iskeyword'     & "@,48-57,_"   keywords contain alphanumeric
                                                characters and '_'
        'joinspaces'    + on            insert 2 spaces after period
        'modeline'      & off           no modelines
        'more'          & off           no pauses in listings
        'mzquantum'     - {unchanged}   {set vim default only on resetting 'cp'}
        'numberwidth'   & 8             min number of columns for line number
        'preserveindent'+ off           don't preserve current indent structure
                                                when changing it
        'revins'        + off           no reverse insert
        'ruler'         + off           no ruler
        'scrolljump'    + 1             no jump scroll
        'scrolloff'     + 0             no scroll offset
        'shelltemp'     - {unchanged}   {set vim default only on resetting 'cp'}
        'shiftround'    + off           indent not rounded to shiftwidth
        'shortmess'     & "S"           no shortening of messages
        'showcmd'       & off           command characters not shown
        'showmode'      & off           current mode not shown
        'sidescrolloff' + 0             cursor moves to edge of screen in scroll
        'smartcase'     + off           no automatic ignore case switch
        'smartindent'   + off           no smart indentation
        'smarttab'      + off           no smart tab size
        'softtabstop'   + 0             tabs are always 'tabstop' positions
        'startofline'   + on            goto startofline with some commands
        'tagcase'       & "followic"    'ignorecase' when searching tags file
        'tagrelative'   & off           tag file names are not relative
        'termguicolors' + off           don't use highlight-(guifg|guibg)
        'textauto'      & off           no automatic textmode detection
        'textwidth'     + 0             no automatic line wrap
        'tildeop'       + off           tilde is not an operator
        'ttimeout'      + off           no terminal timeout
        'undofile'      + off           don't use an undo file
        'viminfo'       - {unchanged}   {set Vim default only on resetting 'cp'}
        'virtualedit'   + ""            cursor can only be placed on characters
        'whichwrap'     & ""            left-right movements don't wrap
        'wildchar'      & CTRL-E        only when the current value is <Tab>
                                        use CTRL-E for cmdline completion
        'writebackup'   + on or off     depends on the +writebackup feature

                                                'complete' 'cpt' E535
'complete' 'cpt'        string  (default: ".,w,b,u,t,i")
                        local to buffer
        This option specifies how keyword completion ins-completion works
        when CTRL-P or CTRL-N are used.  It is also used for whole-line
        completion i_CTRL-X_CTRL-L.  It indicates the type of completion
        and the places to scan.  It is a comma-separated list of flags:
        .       scan the current buffer ('wrapscan' is ignored)
        w       scan buffers from other windows
        b       scan other loaded buffers that are in the buffer list
        u       scan the unloaded buffers that are in the buffer list
        U       scan the buffers that are not in the buffer list
        k       scan the files given with the 'dictionary' option
        kspell  use the currently active spell checking spell
        k{dict} scan the file {dict}.  Several "k" flags can be given,
                patterns are valid too.  For example:
                        :set cpt=k/usr/dict/*,k~/spanish
        s       scan the files given with the 'thesaurus' option
        s{tsr}  scan the file {tsr}.  Several "s" flags can be given, patterns
                are valid too.
        i       scan current and included files
        d       scan current and included files for defined name or macro
                i_CTRL-X_CTRL-D
        ]       tag completion
        t       same as "]"

        Unloaded buffers are not loaded, thus their autocmds :autocmd are
        not executed, this may lead to unexpected completions from some files
        (gzipped files for example).  Unloaded buffers are not scanned for
        whole-line completion.

        The default is ".,w,b,u,t,i", which means to scan:
           1. the current buffer
           2. buffers in other windows
           3. other loaded buffers
           4. unloaded buffers
           5. tags
           6. included files

        As you can see, CTRL-N and CTRL-P can be used to do any 'iskeyword'-
        based expansion (e.g., dictionary i_CTRL-X_CTRL-K, included patterns
        i_CTRL-X_CTRL-I, tags i_CTRL-X_CTRL-] and normal expansions).

                                                'completefunc' 'cfu'
'completefunc' 'cfu'    string  (default: empty)
                        local to buffer
                        {not available when compiled without the +eval
                        feature}
        This option specifies a function to be used for Insert mode completion
        with CTRL-X CTRL-Ui_CTRL-X_CTRL-U
        See complete-functions for an explanation of how the function is
        invoked and what it should return.  The value can be the name of a
        function, a lambda or a Funcref. See option-value-function for
        more information.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                                'completeitemalign' 'cia'
'completeitemalign' 'cia' string (default: "abbr,kind,menu")
                          global
        A comma-separated list of complete-items that controls the alignment
        and display order of items in the popup menu during Insert mode
        completion. The supported values are abbr, kind, and menu. These
        options allow to customize how the completion items are shown in the
        popup menu.  Note: must always contain those three values in any
        order.

                                                'completeopt' 'cot'
'completeopt' 'cot'     string  (default: "menu,preview")
                        global or local to buffer global-local
        A comma-separated list of options for Insert mode completion
        ins-completion.  The supported values are:

           menu     Use a popup menu to show the possible completions.  The
                    menu is only shown when there is more than one match and
                    sufficient colors are available.  ins-completion-menu

           menuone  Use the popup menu also when there is only one match.
                    Useful when there is additional information about the
                    match, e.g., what file it comes from.

           longest  Only insert the longest common text of the matches.  If
                    the menu is displayed you can use CTRL-L to add more
                    characters.  Whether case is ignored depends on the kind
                    of completion.  For buffer text the 'ignorecase' option is
                    used.

           preview  Show extra information about the currently selected
                    completion in the preview window.  Only works in
                    combination with "menu" or "menuone".

           popup    Show extra information about the currently selected
                    completion in a popup window.  Only works in combination
                    with "menu" or "menuone".  Overrides "preview".
                    See 'completepopup' for specifying properties.
                    {only works when compiled with the +textprop feature}

           popuphidden
                    Just like "popup" but initially hide the popup.  Use a
                    CompleteChanged autocommand to fetch the info and call
                    popup_show() once the popup has been filled.
                    See the example at complete-popuphidden.
                    {only works when compiled with the +textprop feature}

           noinsert Do not insert any text for a match until the user selects
                    a match from the menu. Only works in combination with
                    "menu" or "menuone". No effect if "longest" is present.

           noselect Same as "noinsert", except that no menu item is
                    pre-selected. If both "noinsert" and "noselect" are
                    present, "noselect" has precedence.

           fuzzy    Enable fuzzy-matching for completion candidates. This
                    allows for more flexible and intuitive matching, where
                    characters can be skipped and matches can be found even
                    if the exact sequence is not typed.

                                        'completepopup' 'cpp'
'completepopup' 'cpp'   string (default empty)
                        global
                        {not available when compiled without the +textprop
                        or +quickfix feature}
        When 'completeopt' contains "popup" then this option is used for the
        properties of the info popup when it is created.  If an info popup
        window already exists it is closed, so that the option value is
        applied when it is created again.
        You can also use popup_findinfo() and then set properties for an
        existing info popup with popup_setoptions().  See complete-popup.

                                                'completeslash' 'csl'
'completeslash' 'csl'   string  (default: "")
                        local to buffer
                        {only for MS-Windows}
        When this option is set it overrules 'shellslash' for completion:
        - When this option is set to "slash", a forward slash is used for path
          completion in insert mode. This is useful when editing HTML tag, or
          Makefile with 'noshellslash' on MS-Windows.
        - When this option is set to "backslash", backslash is used. This is
          useful when editing a batch file with 'shellslash' set on MS-Windows.
        - When this option is empty, same character is used as for
          'shellslash'.
        For Insert mode completion the buffer-local value is used.  For
        command line completion the global value is used.

                                                'concealcursor' 'cocu'
'concealcursor' 'cocu'  string (default: "")
                        local to window
                        {not available when compiled without the +conceal
                        feature}
        Sets the modes in which text in the cursor line can also be concealed.
        When the current mode is listed then concealing happens just like in
        other lines.
          n             Normal mode
          v             Visual mode
          i             Insert mode
          c             Command line editing, for 'incsearch'

        'v' applies to all lines in the Visual area, not only the cursor.
        A useful value is "nc".  This is used in help files.  So long as you
        are moving around text is concealed, but when starting to insert text
        or selecting a Visual area the concealed text is displayed, so that
        you can see what you are doing.
        Keep in mind that the cursor position is not always where it's
        displayed.  E.g., when moving vertically it may change column.

                                                'conceallevel' 'cole'
'conceallevel' 'cole'   number (default 0)
                        local to window
                        {not available when compiled without the +conceal
                        feature}
        Determine how text with the "conceal" syntax attribute :syn-conceal
        is shown:

        Value           Effect
        0               Text is shown normally
        1               Each block of concealed text is replaced with one
                        character.  If the syntax item does not have a custom
                        replacement character defined (see :syn-cchar) the
                        character defined in 'listchars' is used (default is a
                        space).
                        It is highlighted with the "Conceal" highlight group.
        2               Concealed text is completely hidden unless it has a
                        custom replacement character defined (see
                        :syn-cchar).
        3               Concealed text is completely hidden.

        Note: in the cursor line concealed text is not hidden, so that you can
        edit and copy the text.  This can be changed with the 'concealcursor'
        option.

                                'confirm' 'cf' 'noconfirm' 'nocf'
'confirm' 'cf'          boolean (default off)
                        global
        When 'confirm' is on, certain operations that would normally
        fail because of unsaved changes to a buffer, e.g. ":q" and ":e",
        instead raise a dialog asking if you wish to save the current
        file(s).  You can still use a ! to unconditionally abandon a buffer.
        If 'confirm' is off you can still activate confirmation for one
        command only (this is most useful in mappings) with the :confirm
        command.
        Also see the confirm() function and the 'v' flag in 'guioptions'.

                        'conskey' 'consk' 'noconskey' 'noconsk'
'conskey' 'consk'       boolean (default off)
                        global
        This was for MS-DOS and is no longer supported.

                        'copyindent' 'ci' 'nocopyindent' 'noci'
'copyindent' 'ci'       boolean (default off)
                        local to buffer
        Copy the structure of the existing lines indent when autoindenting a
        new line.  Normally the new indent is reconstructed by a series of
        tabs followed by spaces as required (unless 'expandtab' is enabled,
        in which case only spaces are used).  Enabling this option makes the
        new line copy whatever characters were used for indenting on the
        existing line.  'expandtab' has no effect on these characters, a Tab
        remains a Tab.  If the new indent is greater than on the existing
        line, the remaining space is filled in the normal manner.
        NOTE: This option is reset when 'compatible' is set.
        Also see 'preserveindent'.

                                                'cpoptions' 'cpo' cpo
'cpoptions' 'cpo'       string  (Vim default: "aABceFsz",
                                 Vi default:  all flags, except "#{|&/\."
                                 $VIM_POSIX:  all flags)
                        global
        A sequence of single character flags.  When a character is present
        this indicates Vi-compatible behavior.  This is used for things where
        not being Vi-compatible is mostly or sometimes preferred.
        'cpoptions' stands for "compatible-options".
        Commas can be added for readability.
        To avoid problems with flags that are added in the future, use the
        "+=" and "-=" feature of ":set" add-option-flags.

        NOTE: This option is set to the Vi default value when 'compatible' is
        set and to the Vim default value when 'compatible' is reset.

        NOTE: In a Vim9 script, when vim9script is encountered, the value
        is saved, 'cpoptions' is set to the Vim default, and the saved value
        is restored at the end of the script.  Changes to the value of
        'cpoptions' will be applied to the saved value, but keep in mind that
        removing a flag that is not present when 'cpoptions' is changed has no
        effect.  In the .vimrc file the value is not restored, thus using
        vim9script in the .vimrc file results in using the Vim default.

        NOTE: This option is set to the POSIX default value at startup when
        the Vi default value would be used and the $VIM_POSIX environment
        variable exists posix.  This means Vim tries to behave like the
        POSIX specification.

            contains    behavior
                                                                cpo-a
                a       When included, a ":read" command with a file name
                        argument will set the alternate file name for the
                        current window.
                                                                cpo-A
                A       When included, a ":write" command with a file name
                        argument will set the alternate file name for the
                        current window.
                                                                cpo-b
                b       "\|" in a ":map" command is recognized as the end of
                        the map command.  The '\' is included in the mapping,
                        the text after the '|' is interpreted as the next
                        command.  Use a CTRL-V instead of a backslash to
                        include the '|' in the mapping.  Applies to all
                        mapping, abbreviation, menu and autocmd commands.
                        See also map_bar.
                                                                cpo-B
                B       A backslash has no special meaning in mappings,
                        abbreviations, user commands and the "to" part of the
                        menu commands.  Remove this flag to be able to use a
                        backslash like a CTRL-V.  For example, the command
                        ":map X \<Esc>" results in X being mapped to:
                                'B' included:   "\^["    (^[ is a real <Esc>)
                                'B' excluded:   "<Esc>"  (5 characters)
                                ('<' excluded in both cases)
                                                                cpo-c
                c       Searching continues at the end of any match at the
                        cursor position, but not further than the start of the
                        next line.  When not present searching continues
                        one character from the cursor position.  With 'c'
                        "abababababab" only gets three matches when repeating
                        "/abab", without 'c' there are five matches.
                                                                cpo-C
                C       Do not concatenate sourced lines that start with a
                        backslash.  See line-continuation.
                                                                cpo-d
                d       Using "./" in the 'tags' option doesn't mean to use
                        the tags file relative to the current file, but the
                        tags file in the current directory.
                                                                cpo-D
                D       Can't use CTRL-K to enter a digraph after Normal mode
                        commands with a character argument, like rf and
                        t.
                                                                cpo-e
                e       When executing a register with ":@r", always add a
                        <CR> to the last line, also when the register is not
                        linewise.  If this flag is not present, the register
                        is not linewise and the last line does not end in a
                        <CR>, then the last line is put on the command-line
                        and can be edited before hitting <CR>.
                                                                cpo-E
                E       It is an error when using "y", "d", "c", "g~", "gu" or
                        "gU" on an Empty region.  The operators only work when
                        at least one character is to be operated on.  Example:
                        This makes "y0" fail in the first column.
                                                                cpo-f
                f       When included, a ":read" command with a file name
                        argument will set the file name for the current buffer,
                        if the current buffer doesn't have a file name yet.
                                                                cpo-F
                F       When included, a ":write" command with a file name
                        argument will set the file name for the current
                        buffer, if the current buffer doesn't have a file name
                        yet.  Also see cpo-P.
                                                                cpo-g
                g       Goto line 1 when using ":edit" without argument.
                                                                cpo-H
                H       When using "I" on a line with only blanks, insert
                        before the last blank.  Without this flag insert after
                        the last blank.
                                                                cpo-i
                i       When included, interrupting the reading of a file will
                        leave it modified.
                                                                cpo-I
                I       When moving the cursor up or down just after inserting
                        indent for 'autoindent', do not delete the indent.
                                                                cpo-j
                j       When joining lines, only add two spaces after a '.',
                        not after '!' or '?'.  Also see 'joinspaces'.
                                                                cpo-J
                J       A sentence has to be followed by two spaces after
                        the '.', '!' or '?'.  A <Tab> is not recognized as
                        white space.
                                                                cpo-k
                k       Disable the recognition of raw key codes in
                        mappings, abbreviations, and the "to" part of menu
                        commands.  For example, if <Key> sends ^[OA (where ^[
                        is <Esc>), the command ":map X ^[OA" results in X
                        being mapped to:
                                'k' included:   "^[OA"   (3 characters)
                                'k' excluded:   "<Key>"  (one key code)
                        Also see the '<' flag below.
                                                                cpo-K
                K       Don't wait for a key code to complete when it is
                        halfway a mapping.  This breaks mapping <F1><F1> when
                        only part of the second <F1> has been read.  It
                        enables cancelling the mapping by typing <F1><Esc>.
                                                                cpo-l
                l       Backslash in a [] range in a search pattern is taken
                        literally, only "\]", "\^", "\-" and "\\" are special.
                        See /[]
                           'l' included: "/[ \t]"  finds <Space>, '\' and 't'
                           'l' excluded: "/[ \t]"  finds <Space> and <Tab>
                        Also see cpo-\.
                                                                cpo-L
                L       When the 'list' option is set, 'wrapmargin',
                        'textwidth''softtabstop' and Virtual Replace mode
                        (see gR) count a <Tab> as two characters, instead of
                        the normal behavior of a <Tab>.
                                                                cpo-m
                m       When included, a showmatch will always wait half a
                        second.  When not included, a showmatch will wait half
                        a second or until a character is typed.  'showmatch'
                                                                cpo-M
                M       When excluded, "%" matching will take backslashes into
                        account.  Thus in "( \( )" and "\( ( \)" the outer
                        parenthesis match.  When included "%" ignores
                        backslashes, which is Vi compatible.
                                                                cpo-n
                n       When included, the column used for 'number' and
                        'relativenumber' will also be used for text of wrapped
                        lines.
                                                                cpo-o
                o       Line offset to search command is not remembered for
                        next search.
                                                                cpo-O
                O       Don't complain if a file is being overwritten, even
                        when it didn't exist when editing it.  This is a
                        protection against a file unexpectedly created by
                        someone else.  Vi didn't complain about this.
                                                                cpo-p
                p       Vi compatible Lisp indenting.  When not present, a
                        slightly better algorithm is used.
                                                                cpo-P
                P       When included, a ":write" command that appends to a
                        file will set the file name for the current buffer, if
                        the current buffer doesn't have a file name yet and
                        the 'F' flag is also included cpo-F.
                                                                cpo-q
                q       When joining multiple lines leave the cursor at the
                        position where it would be when joining two lines.
                                                                cpo-r
                r       Redo ("." command) uses "/" to repeat a search
                        command, instead of the actually used search string.
                                                                cpo-R
                R       Remove marks from filtered lines.  Without this flag
                        marks are kept like :keepmarks was used.
                                                                cpo-s
                s       Set buffer options when entering the buffer for the
                        first time.  This is like it is in Vim version 3.0.
                        And it is the default.  If not present the options are
                        set when the buffer is created.
                                                                cpo-S
                S       Set buffer options always when entering a buffer
                        (except 'readonly''fileformat''filetype' and
                        'syntax').  This is the (most) Vi compatible setting.
                        The options are set to the values in the current
                        buffer.  When you change an option and go to another
                        buffer, the value is copied.  Effectively makes the
                        buffer options global to all buffers.

                        's'    'S'     copy buffer options
                        no     no      when buffer created
                        yes    no      when buffer first entered (default)
                         X     yes     each time when buffer entered (vi comp.)
                                                                cpo-t
                t       Search pattern for the tag command is remembered for
                        "n" command.  Otherwise Vim only puts the pattern in
                        the history for search pattern, but doesn't change the
                        last used search pattern.
                                                                cpo-u
                u       Undo is Vi compatible.  See undo-two-ways.
                                                                cpo-v
                v       Backspaced characters remain visible on the screen in
                        Insert mode.  Without this flag the characters are
                        erased from the screen right away.  With this flag the
                        screen newly typed text overwrites backspaced
                        characters.
                                                                cpo-w
                w       When using "cw" on a blank character, only change one
                        character and not all blanks until the start of the
                        next word.
                                                                cpo-W
                W       Don't overwrite a readonly file.  When omitted, ":w!"
                        overwrites a readonly file, if possible.
                                                                cpo-x
                x       <Esc> on the command-line executes the command-line.
                        The default in Vim is to abandon the command-line,
                        because <Esc> normally aborts a command.  c_<Esc>
                                                                cpo-X
                X       When using a count with "R" the replaced text is
                        deleted only once.  Also when repeating "R" with "."
                        and a count.
                                                                cpo-y
                y       A yank command can be redone with ".".  Think twice if
                        you really want to use this, it may break some
                        plugins, since most people expect "." to only repeat a
                        change.
                                                                cpo-Z
                Z       When using "w!" while the 'readonly' option is set,
                        don't reset 'readonly'.
                                                                cpo-z
                z       Special casing the "cw" and "d" command (see cw and
                        d-special).
                                                                cpo-!
                !       When redoing a filter command, use the last used
                        external command, whatever it was.  Otherwise the last
                        used -filter- command is used.
                                                                cpo-$
                $       When making a change to one line, don't redisplay the
                        line, but put a '$' at the end of the changed text.
                        The changed text will be overwritten when you type the
                        new text.  The line is redisplayed if you type any
                        command that moves the cursor from the insertion
                        point.
                                                                cpo-%
                %       Vi-compatible matching is done for the "%" command.
                        Does not recognize "#if", "#endif", etc.
                        Does not recognize "/*" and "*/".
                        Parens inside single and double quotes are also
                        counted, causing a string that contains a paren to
                        disturb the matching.  For example, in a line like
                        "if (strcmp("foo(", s))" the first paren does not
                        match the last one.  When this flag is not included,
                        parens inside single and double quotes are treated
                        specially.  When matching a paren outside of quotes,
                        everything inside quotes is ignored.  When matching a
                        paren inside quotes, it will find the matching one (if
                        there is one).  This works very well for C programs.
                        This flag is also used for other features, such as
                        C-indenting.
                                                                cpo--
                -       When included, a vertical movement command fails when
                        it would go above the first line or below the last
                        line.  Without it the cursor moves to the first or
                        last line, unless it already was in that line.
                        Applies to the commands "-", "k", CTRL-P, "+", "j",
                        CTRL-NCTRL-J and ":1234".
                                                                cpo-+
                +       When included, a ":write file" command will reset the
                        'modified' flag of the buffer, even though the buffer
                        itself may still be different from its file.
                                                                cpo-star
                *       Use ":*" in the same way as ":@".  When not included,
                        ":*" is an alias for ":'<,'>", select the Visual area.
                                                                cpo-<
                <       Disable the recognition of special key codes in <>
                        form in mappings, abbreviations, and the "to" part of
                        menu commands.  For example, the command
                        ":map X <Tab>" results in X being mapped to:
                                '<' included:   "<Tab>"  (5 characters)
                                '<' excluded:   "^I"     (^I is a real <Tab>)
                        Also see the 'k' flag above.
                                                                cpo->
                >       When appending to a register, put a line break before
                        the appended text.
                                                                cpo-;
                ;       When using , or ; to repeat the last t search
                        and the cursor is right in front of the searched
                        character, the cursor won't move. When not included,
                        the cursor would skip over it and jump to the
                        following occurrence.

        POSIX flags.  These are not included in the Vi default value, except
        when $VIM_POSIX was set on startup. posix

            contains    behavior
                                                                cpo-#
                #       A count before "D", "o" and "O" has no effect.
                                                                cpo-&
                &       When ":preserve" was used keep the swap file when
                        exiting normally while this buffer is still loaded.
                        This flag is tested when exiting.
                                                                cpo-\
                \       Backslash in a [] range in a search pattern is taken
                        literally, only "\]" is special  See /[]
                           '\' included: "/[ \-]"  finds <Space>, '\' and '-'
                           '\' excluded: "/[ \-]"  finds <Space> and '-'
                        Also see cpo-l.
                                                                cpo-/
                /       When "%" is used as the replacement string in a :s
                        command, use the previous replacement string. :s%
                                                                cpo-{
                {       The { and } commands also stop at a "{" character
                        at the start of a line.
                                                                cpo-.
                .       The ":chdir" and ":cd" commands fail if the current
                        buffer is modified, unless ! is used.  Vim doesn't
                        need this, since it remembers the full path of an
                        opened file.
                                                                cpo-bar
                |       The value of the $LINES and $COLUMNS environment
                        variables overrule the terminal size values obtained
                        with system specific functions.

                                                'cryptmethod' 'cm'
'cryptmethod' 'cm'      string  (default "blowfish2")
                        global or local to buffer global-local
        Method used for encryption when the buffer is written to a file:
                                                        pkzip
           zip          PkZip compatible method.  A weak kind of encryption.
                        Backwards compatible with Vim 7.2 and older.
                        Only use if you need to be backwards compatible.
                                                        blowfish
           blowfish     Blowfish method.  Medium strong encryption but it has
                        an implementation flaw.  Requires Vim 7.3 or later,
                        files can NOT be read by Vim 7.2 and older.  This adds
                        a "seed" to the file, every time you write the file
                        the encrypted bytes will be different.
                        Obsolete, please do no longer use.
                                                        blowfish2
           blowfish2    Blowfish method.  Medium strong encryption.  Requires
                        Vim 7.4.401 or later, files can NOT be read by Vim 7.3
                        and older.  This adds a "seed" to the file, every time
                        you write the file the encrypted bytes will be
                        different.  The whole undo file is encrypted, not just
                        the pieces of text.
                                        E1193 E1194 E1195 E1196 E1230
                                        E1197 E1198 E1199 E1200 E1201
           xchacha20    XChaCha20 Cipher with Poly1305 Message Authentication
                        Code.  Medium strong till strong encryption.
                        Encryption is provided by the libsodium library, it
                        requires Vim to be built with +sodium.
                        It adds a seed and a message authentication code (MAC)
                        to the file.  This needs at least a Vim 8.2.3022 to
                        read the encrypted file.
                        Encryption of swap files is not supported, therefore
                        no swap file will be used when xchacha20 encryption is
                        enabled.
                        Encryption of undo files is not yet supported,
                        therefore no undo file will currently be written.
                        CAREFUL: Files written with this method might have to
                        be read back with the same version of Vim if the
                        binary format changes later.
                        Obsolete, please do no longer use.
           xchacha20v2  Same algorithm as with "xchacha20" that correctly
                        stores the key derivation parameters together with the
                        encrypted file.  Should work better in case the
                        parameters in the libsodium library ever change.
                        STILL EXPERIMENTAL: Files written with this method
                        might have to be read back with the same version of
                        Vim if the binary format changes later.

        You should use "blowfish2", also to re-encrypt older files.  The
        "xchacha20" method provides better encryption, but it does not work
        with all versions of Vim.

        When reading an encrypted file 'cryptmethod' will be set automatically
        to the detected method of the file being read.  Thus if you write it
        without changing 'cryptmethod' the same method will be used.
        Changing 'cryptmethod' does not mark the file as modified, you have to
        explicitly write it, you don't get a warning unless there are other
        modifications.  Also see :X.

        When setting the global value to an empty string, it will end up with
        the value "blowfish2".  When setting the local value to an empty
        string the buffer will use the global value.

        When a new encryption method is added in a later version of Vim, and
        the current version does not recognize it, you will get E821 .
        You need to edit this file with the later version of Vim.

                                                'cscopepathcomp' 'cspc'
'cscopepathcomp' 'cspc' number  (default 0)
                        global
                        {not available when compiled without the +cscope
                        feature}
        Determines how many components of the path to show in a list of tags.
        See cscopepathcomp.
        NOTE: This option is set to 0 when 'compatible' is set.

                                                'cscopeprg' 'csprg'
'cscopeprg' 'csprg'     string  (default "cscope")
                        global
                        {not available when compiled without the +cscope
                        feature}
        Specifies the command to execute cscope.  See cscopeprg.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                                'cscopequickfix' 'csqf'
'cscopequickfix' 'csqf' string  (default "")
                        global
                        {not available when compiled without the +cscope
                        or +quickfix features}
        Specifies whether to use quickfix window to show cscope results.
        See cscopequickfix.

                'cscoperelative' 'csre' 'nocscoperelative' 'nocsre'
'cscoperelative' 'csre' boolean (default off)
                        global
                        {not available when compiled without the +cscope
                        feature}
        In the absence of a prefix (-P) for cscope. setting this option enables
        to use the basename of cscope.out path as the prefix.
        See cscoperelative.
        NOTE: This option is reset when 'compatible' is set.

                                'cscopetag' 'cst' 'nocscopetag' 'nocst'
'cscopetag' 'cst'       boolean (default off)
                        global
                        {not available when compiled without the +cscope
                        feature}
        Use cscope for tag commands.  See cscope-options.
        NOTE: This option is reset when 'compatible' is set.

                                                'cscopetagorder' 'csto'
'cscopetagorder' 'csto' number  (default 0)
                        global
                        {not available when compiled without the +cscope
                        feature}
        Determines the order in which ":cstag" performs a search.  See
        cscopetagorder.
        NOTE: This option is set to 0 when 'compatible' is set.

                                        'cscopeverbose' 'csverb'
                                        'nocscopeverbose' 'nocsverb'
'cscopeverbose' 'csverb' boolean (default off)
                        global
                        {not available when compiled without the +cscope
                        feature}
        Give messages when adding a cscope database.  See cscopeverbose.
        NOTE: This option is reset when 'compatible' is set.

                        'cursorbind' 'crb' 'nocursorbind' 'nocrb'
'cursorbind' 'crb'      boolean  (default off)
                        local to window
        When this option is set, as the cursor in the current
        window moves other cursorbound windows (windows that also have
        this option set) move their cursors to the corresponding line and
        column.  This option is useful for viewing the
        differences between two versions of a file (see 'diff'); in diff mode,
        inserted and deleted lines (though not characters within a line) are
        taken into account.

                        'cursorcolumn' 'cuc' 'nocursorcolumn' 'nocuc'
'cursorcolumn' 'cuc'    boolean (default off)
                        local to window
                        {not available when compiled without the +syntax
                        feature}
        Highlight the screen column of the cursor with CursorColumn
        hl-CursorColumn.  Useful to align text.  Will make screen redrawing
        slower.
        If you only want the highlighting in the current window you can use
        these autocommands:
                au WinLeave * set nocursorline nocursorcolumn
                au WinEnter * set cursorline cursorcolumn


                        'cursorline' 'cul' 'nocursorline' 'nocul'
'cursorline' 'cul'      boolean (default off)
                        local to window
                        {not available when compiled without the +syntax
                        feature}
        Highlight the text line of the cursor with CursorLine hl-CursorLine.
        Useful to easily spot the cursor.  Will make screen redrawing slower.
        When Visual mode is active the highlighting isn't used to make it
        easier to see the selected text.

                                                'cursorlineopt' 'culopt'
'cursorlineopt' 'culopt' string (default: "number,line")
                        local to window
                        {not available when compiled without the +syntax
                        feature}
        Comma-separated list of settings for how 'cursorline' is displayed.
        Valid values:
        "line"          Highlight the text line of the cursor with
                        CursorLine hl-CursorLine.
        "screenline"    Highlight only the screen line of the cursor with
                        CursorLine hl-CursorLine.
        "number"        Highlight the line number of the cursor with
                        CursorLineNr hl-CursorLineNr.

        Special value:
        "both"          Alias for the values "line,number".

        "line" and "screenline" cannot be used together.

                                                'debug'
'debug'                 string  (default "")
                        global
        These values can be used:
        msg     Error messages that would otherwise be omitted will be given
                anyway.
        throw   Error messages that would otherwise be omitted will be given
                anyway and also throw an exception and set v:errmsg.
        beep    A message will be given when otherwise only a beep would be
                produced.
        The values can be combined, separated by a comma.
        "msg" and "throw" are useful for debugging 'foldexpr''formatexpr' or
        'indentexpr'.

                                                'define' 'def'
'define' 'def'          string  (default "^\s*#\s*define")
                        global or local to buffer global-local
        Pattern to be used to find a macro definition.  It is a search
        pattern, just like for the "/" command.  This option is used for the
        commands like "[i" and "[d" include-search.  The 'isident' option is
        used to recognize the defined name after the match:
                {match with 'define'}{non-ID chars}{defined name}{non-ID char}
        See option-backslash about inserting backslashes to include a space
        or backslash.
        The default value is for C programs.  For C++ this value would be
        useful, to include const type declarations:
                ^\(#\s*define\|[a-z]*\s*const\s*[a-z]*\)
        You can also use "\ze" just before the name and continue the pattern
        to check what is following.  E.g. for Javascript, if a function is
        defined with "func_name = function(args)":
                ^\s*\ze\i\+\s*=\s*function(
        If the function is defined with "func_name : function() {...":
                ^\s*\ze\i\+\s*[:]\s*(*function\s*(
        When using the ":set" command, you need to double the backslashes!
        To avoid that use :let with a single quote string:
                let &l:define = '^\s*\ze\k\+\s*=\s*function('


                        'delcombine' 'deco' 'nodelcombine' 'nodeco'
'delcombine' 'deco'     boolean (default off)
                        global
        If editing Unicode and this option is set, backspace and Normal mode
        "x" delete each combining character on its own.  When it is off (the
        default) the character along with its combining characters are
        deleted.
        Note: When 'delcombine' is set "xx" may work differently from "2x"!

        This is useful for Arabic, Hebrew and many other languages where one
        may have combining characters overtop of base characters, and want
        to remove only the combining ones.
        NOTE: This option is reset when 'compatible' is set.

                                                'dictionary' 'dict'
'dictionary' 'dict'     string  (default "")
                        global or local to buffer global-local
        List of file names, separated by commas, that are used to lookup words
        for keyword completion commands i_CTRL-X_CTRL-K.  Each file should
        contain a list of words.  This can be one word per line, or several
        words per line, separated by non-keyword characters (white space is
        preferred).  Maximum line length is 510 bytes.

        When this option is empty or an entry "spell" is present, and spell
        checking is enabled, words in the word lists for the currently active
        'spelllang' are used. See spell.

        To include a comma in a file name precede it with a backslash.  Spaces
        after a comma are ignored, otherwise spaces are included in the file
        name.  See option-backslash about using backslashes.
        This has nothing to do with the Dictionary variable type.
        Where to find a list of words?
        - On FreeBSD, there is the file "/usr/share/dict/words".
        - In the Simtel archive, look in the "msdos/linguist" directory.
        - In "miscfiles" of the GNU collection.
        The use of :set+= and :set-= is preferred when adding or removing
        directories from the list.  This avoids problems when a future version
        uses another default.
        Backticks cannot be used in this option for security reasons.

                                                        'diff' 'nodiff'
'diff'                  boolean (default off)
                        local to window
                        {not available when compiled without the +diff
                        feature}
        Join the current window in the group of windows that shows differences
        between files.  See vimdiff.

                                                'dex' 'diffexpr'
'diffexpr' 'dex'        string  (default "")
                        global
                        {not available when compiled without the +diff
                        feature}
        Expression which is evaluated to obtain a diff file (either ed-style
        or unified-style) from two versions of a file.  See diff-diffexpr.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                                'dip' 'diffopt'
'diffopt' 'dip'         string  (default "internal,filler,closeoff")
                        global
                        {not available when compiled without the +diff
                        feature}
        Option settings for diff mode.  It can consist of the following items.
        All are optional.  Items must be separated by a comma.

                filler          Show filler lines, to keep the text
                                synchronized with a window that has inserted
                                lines at the same position.  Mostly useful
                                when windows are side-by-side and 'scrollbind'
                                is set.

                context:{n}     Use a context of {n} lines between a change
                                and a fold that contains unchanged lines.
                                When omitted a context of six lines is used.
                                When using zero the context is actually one,
                                since folds require a line in between, also
                                for a deleted line. Set it to a very large
                                value (999999) to disable folding completely.
                                See fold-diff.

                iblank          Ignore changes where lines are all blank.  Adds
                                the "-B" flag to the "diff" command if
                                'diffexpr' is empty.  Check the documentation
                                of the "diff" command for what this does
                                exactly.
                                NOTE: the diff windows will get out of sync,
                                because no differences between blank lines are
                                taken into account.

                icase           Ignore changes in case of text.  "a" and "A"
                                are considered the same.  Adds the "-i" flag
                                to the "diff" command if 'diffexpr' is empty.

                iwhite          Ignore changes in amount of white space.  Adds
                                the "-b" flag to the "diff" command if
                                'diffexpr' is empty.  Check the documentation
                                of the "diff" command for what this does
                                exactly.  It should ignore adding trailing
                                white space, but not leading white space.

                iwhiteall       Ignore all white space changes.  Adds
                                the "-w" flag to the "diff" command if
                                'diffexpr' is empty.  Check the documentation
                                of the "diff" command for what this does
                                exactly.

                iwhiteeol       Ignore white space changes at end of line.
                                Adds the "-Z" flag to the "diff" command if
                                'diffexpr' is empty.  Check the documentation
                                of the "diff" command for what this does
                                exactly.

                horizontal      Start diff mode with horizontal splits (unless
                                explicitly specified otherwise).

                vertical        Start diff mode with vertical splits (unless
                                explicitly specified otherwise).

                closeoff        When a window is closed where 'diff' is set
                                and there is only one window remaining in the
                                same tab page with 'diff' set, execute
                                :diffoff in that window.  This undoes a
                                :diffsplit command.

                hiddenoff       Do not use diff mode for a buffer when it
                                becomes hidden.

                foldcolumn:{n}  Set the 'foldcolumn' option to {n} when
                                starting diff mode.  Without this 2 is used.

                followwrap      Follow the 'wrap' option and leave as it is.

                internal        Use the internal diff library.  This is
                                ignored when 'diffexpr' is set.  E960
                                When running out of memory when writing a
                                buffer this item will be ignored for diffs
                                involving that buffer.  Set the 'verbose'
                                option to see when this happens.

                indent-heuristic
                                Use the indent heuristic for the internal
                                diff library.

                algorithm:{text} Use the specified diff algorithm with the
                                internal diff engine. Currently supported
                                algorithms are:
                                myers      the default algorithm
                                minimal    spend extra time to generate the
                                           smallest possible diff
                                patience   patience diff algorithm
                                histogram  histogram diff algorithm

        Examples:
                :set diffopt=internal,filler,context:4
                :set diffopt=
                :set diffopt=internal,filler,foldcolumn:3
                :set diffopt-=internal  " do NOT use the internal diff parser

                                     'digraph' 'dg' 'nodigraph' 'nodg'
'digraph' 'dg'          boolean (default off)
                        global
                        {not available when compiled without the +digraphs
                        feature}
        Enable the entering of digraphs in Insert mode with {char1} <BS>
        {char2}.  See digraphs.
        NOTE: This option is reset when 'compatible' is set.

                                                'directory' 'dir'
'directory' 'dir'       string  (default for Amiga: ".,t:",
                                 for Win32: ".,$TEMP,c:\tmp,c:\temp"
                                 for Unix: ".,~/tmp,/var/tmp,/tmp")
                        global
        List of directory names for the swap file, separated with commas.
        Recommended value:  ".,~/vimswap//" - this will put the swap file next
        to the edited file if possible, and in your personal swap directory
        otherwise.  Make sure "~/vimswap//" is only readable for you.

        Possible items:
        - The swap file will be created in the first directory where this is
          possible.
        - Empty means that no swap file will be used (recovery is
          impossible!) and no E303 error will be given.
        - A directory "." means to put the swap file in the same directory as
          the edited file.  On Unix, a dot is prepended to the file name, so
          it doesn't show in a directory listing.  On MS-Windows the "hidden"
          attribute is set and a dot prepended if possible.
        - A directory starting with "./" (or ".\" for MS-Windows) means to put
          the swap file relative to where the edited file is.  The leading "."
          is replaced with the path name of the edited file.
        - For Unix and Win32, if a directory ends in two path separators "//",
          the swap file name will be built from the complete path to the file
          with all path separators replaced by percent '%' signs (including
          the colon following the drive letter on Win32). This will ensure
          file name uniqueness in the preserve directory.
          On Win32, it is also possible to end with "\\".  However, When a
          separating comma is following, you must use "//", since "\\" will
          include the comma in the file name. Therefore it is recommended to
          use '//', instead of '\\'.
        - Spaces after the comma are ignored, other spaces are considered part
          of the directory name.  To have a space at the start of a directory
          name, precede it with a backslash.
        - To include a comma in a directory name precede it with a backslash.
        - A directory name may end in an ':' or '/'.
        - Environment variables are expanded :set_env.
        - Careful with '\' characters, type one before a space, type two to
          get one in the option (see option-backslash), for example:
            :set dir=c:\\tmp,\ dir\\,with\\,commas,\\\ dir\ with\ spaces
        - For backwards compatibility with Vim version 3.0 a '>' at the start
          of the option is removed.
        Using "." first in the list is recommended.  This means that editing
        the same file twice will result in a warning.  Using "/tmp" on Unix is
        discouraged: When the system crashes you lose the swap file.
        "/var/tmp" is often not cleared when rebooting, thus is a better
        choice than "/tmp".  But others on the computer may be able to see the
        files, and it can contain a lot of files, your swap files get lost in
        the crowd.  That is why a "tmp" directory in your home directory is
        tried first.
        The use of :set+= and :set-= is preferred when adding or removing
        directories from the list.  This avoids problems when a future version
        uses another default.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                        'display' 'dy'
'display' 'dy'          string  (default "", set to "truncate" in
                                                               defaults.vim)
                        global
        Change the way text is displayed.  This is a comma-separated list of
        flags:
        lastline        When included, as much as possible of the last line
                        in a window will be displayed.  "@@@" is put in the
                        last columns of the last screen line to indicate the
                        rest of the line is not displayed.
        truncate        Like "lastline", but "@@@" is displayed in the first
                        column of the last screen line.  Overrules "lastline".
        uhex            Show unprintable characters hexadecimal as <xx>
                        instead of using ^C and ~C.

        When neither "lastline" nor "truncate" is included, a last line that
        doesn't fit is replaced with "@" lines.

        The "@" character can be changed by setting the "lastline" item in
        'fillchars'.  The character is highlighted with hl-NonText.

                                                'eadirection' 'ead'
'eadirection' 'ead'     string  (default "both")
                        global
        Tells when the 'equalalways' option applies:
                ver     vertically, width of windows is not affected
                hor     horizontally, height of windows is not affected
                both    width and height of windows is affected

                           'ed' 'edcompatible' 'noed' 'noedcompatible'
'edcompatible' 'ed'     boolean (default off)
                        global
        Makes the 'g' and 'c' flags of the ":substitute" command to be
        toggled each time the flag is given.  See complex-change.  See
        also 'gdefault' option.
        Switching this option on may break plugins!
        This option is not used in Vim9 script.

                                        'emoji' 'emo' 'noemoji' 'noemo'
'emoji' 'emo'   boolean (default: on)
                        global
        When on all Unicode emoji characters are considered to be full width.
        This excludes "text emoji" characters, which are normally displayed as
        single width.  Unfortunately there is no good specification for this
        and it has been determined on trial-and-error basis.  Use the
        setcellwidths() function to change the behavior.

                                        'encoding' 'enc' E543
'encoding' 'enc'        string (default for MS-Windows: "utf-8",
                                otherwise: value from $LANG or "latin1")
                        global
        Sets the character encoding used inside Vim.  It applies to text in
        the buffers, registers, Strings in expressions, text stored in the
        viminfo file, etc.  It sets the kind of characters which Vim can work
        with.  See encoding-names for the possible values.

        NOTE: Changing this option will not change the encoding of the
        existing text in Vim.  It may cause non-ASCII text to become invalid.
        It should normally be kept at its default value, or set when Vim
        starts up.  See multibyte.  To reload the menus see :menutrans.

        This option cannot be set from a modeline.  It would most likely
        corrupt the text.

        NOTE: For GTK+ 2 or later, it is highly recommended to set 'encoding'
        to "utf-8".  Although care has been taken to allow different values of
        'encoding', "utf-8" is the natural choice for the environment and
        avoids unnecessary conversion overhead.  "utf-8" has not been made
        the default to prevent different behavior of the GUI and terminal
        versions, and to avoid changing the encoding of newly created files
        without your knowledge (in case 'fileencodings' is empty).

        The character encoding of files can be different from 'encoding'.
        This is specified with 'fileencoding'.  The conversion is done with
        iconv() or as specified with 'charconvert'.

        If you need to know whether 'encoding' is a multibyte encoding, you
        can use:
                if has("multi_byte_encoding")

        Normally 'encoding' will be equal to your current locale.  This will
        be the default if Vim recognizes your environment settings.  If
        'encoding' is not set to the current locale, 'termencoding' must be
        set to convert typed and displayed text.  See encoding-table.

        When you set this option, it fires the EncodingChanged autocommand
        event so that you can set up fonts if necessary.

        When the option is set, the value is converted to lowercase.  Thus
        you can set it with uppercase values too.  Underscores are translated
        to '-' signs.
        When the encoding is recognized, it is changed to the standard name.
        For example "Latin-1" becomes "latin1", "ISO_88592" becomes
        "iso-8859-2" and "utf8" becomes "utf-8".

        Note: "latin1" is also used when the encoding could not be detected.
        This only works when editing files in the same encoding!  When the
        actual character set is not latin1, make sure 'fileencoding' and
        'fileencodings' are empty.  When conversion is needed, switch to using
        utf-8.

        When "unicode", "ucs-2" or "ucs-4" is used, Vim internally uses utf-8.
        You don't notice this while editing, but it does matter for the
        viminfo-file.  And Vim expects the terminal to use utf-8 too.  Thus
        setting 'encoding' to one of these values instead of utf-8 only has
        effect for encoding used for files when 'fileencoding' is empty.

        When 'encoding' is set to a Unicode encoding, and 'fileencodings' was
        not set yet, the default for 'fileencodings' is changed.

                        'endoffile' 'eof' 'noendoffile' 'noeof'
'endoffile' 'eof'       boolean (default off)
                        local to buffer
        Indicates that a CTRL-Z character was found at the end of the file
        when reading it.  Normally only happens when 'fileformat' is "dos".
        When writing a file and this option is off and the 'binary' option
        is on, or 'fixeol' option is off, no CTRL-Z will be written at the
        end of the file.
        See eol-and-eof for example settings.

                        'endofline' 'eol' 'noendofline' 'noeol'
'endofline' 'eol'       boolean (default on)
                        local to buffer
        When writing a file and this option is off and the 'binary' option
        is on, or 'fixeol' option is off, no <EOL> will be written for the
        last line in the file.  This option is automatically set or reset when
        starting to edit a new file, depending on whether file has an <EOL>
        for the last line in the file.  Normally you don't have to set or
        reset this option.
        When 'binary' is off and 'fixeol' is on the value is not used when
        writing the file.  When 'binary' is on or 'fixeol' is off it is used
        to remember the presence of a <EOL> for the last line in the file, so
        that when you write the file the situation from the original file can
        be kept.  But you can change it if you want to.
        See eol-and-eof for example settings.

                             'equalalways' 'ea' 'noequalalways' 'noea'
'equalalways' 'ea'      boolean (default on)
                        global
        When on, all the windows are automatically made the same size after
        splitting or closing a window.  This also happens the moment the
        option is switched on.  When off, splitting a window will reduce the
        size of the current window and leave the other windows the same.  When
        closing a window the extra lines are given to the window next to it
        (depending on 'splitbelow' and 'splitright').
        When mixing vertically and horizontally split windows, a minimal size
        is computed and some windows may be larger if there is room.  The
        'eadirection' option tells in which direction the size is affected.
        Changing the height and width of a window can be avoided by setting
        'winfixheight' and 'winfixwidth', respectively.
        If a window size is specified when creating a new window sizes are
        currently not equalized (it's complicated, but may be implemented in
        the future).

                                                'equalprg' 'ep'
'equalprg' 'ep'         string  (default "")
                        global or local to buffer global-local
        External program to use for "=" command.  When this option is empty
        the internal formatting functions are used; either 'lisp''cindent'
        or 'indentexpr'.  When Vim was compiled without internal formatting,
        the "indent" program is used.
        Environment variables are expanded :set_env.  See option-backslash
        about including spaces and backslashes.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                        'errorbells' 'eb' 'noerrorbells' 'noeb'
'errorbells' 'eb'       boolean (default off)
                        global
        Ring the bell (beep or screen flash) for error messages.  This only
        makes a difference for error messages, the bell will be used always
        for a lot of errors without a message (e.g., hitting <Esc> in Normal
        mode).  See 'visualbell' on how to make the bell behave like a beep,
        screen flash or do nothing. See 'belloff' to finetune when to ring the
        bell.

                                                'errorfile' 'ef'
'errorfile' 'ef'        string  (Amiga default: "AztecC.Err",
                                        others: "errors.err")
                        global
                        {not available when compiled without the +quickfix
                        feature}
        Name of the errorfile for the QuickFix mode (see :cf).
        When the "-q" command-line argument is used, 'errorfile' is set to the
        following argument.  See -q.
        NOT used for the ":make" command.  See 'makeef' for that.
        Environment variables are expanded :set_env.
        See option-backslash about including spaces and backslashes.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                                'errorformat' 'efm'
'errorformat' 'efm'     string  (default is very long)
                        global or local to buffer global-local
                        {not available when compiled without the +quickfix
                        feature}
        Scanf-like description of the format for the lines in the error file
        (see errorformat).

                                     'esckeys' 'ek' 'noesckeys' 'noek'
'esckeys' 'ek'          boolean (Vim default: on, Vi default: off)
                        global
        Function keys that start with an <Esc> are recognized in Insert
        mode.  When this option is off, the cursor and function keys cannot be
        used in Insert mode if they start with an <Esc>.  The advantage of
        this is that the single <Esc> is recognized immediately, instead of
        after one second.  Instead of resetting this option, you might want to
        try changing the values for 'timeoutlen' and 'ttimeoutlen'.  Note that
        when 'esckeys' is off, you can still map anything, but the cursor keys
        won't work by default.
        NOTE: This option is set to the Vi default value when 'compatible' is
        set and to the Vim default value when 'compatible' is reset.
        NOTE: when this option is off then the modifyOtherKeys and
        xterm-bracketed-paste functionality is disabled while in Insert mode
        to avoid ending Insert mode with any key that has a modifier.

                                                'eventignore' 'ei'
'eventignore' 'ei'      string  (default "")
                        global
        A list of autocommand event names, which are to be ignored.
        When set to "all" or when "all" is one of the items, all autocommand
        events are ignored, autocommands will not be executed.
        Otherwise this is a comma-separated list of event names.  Example:
            :set ei=WinEnter,WinLeave

                                 'expandtab' 'et' 'noexpandtab' 'noet'
'expandtab' 'et'        boolean (default off)
                        local to buffer
        In Insert mode: Use the appropriate number of spaces to insert a
        <Tab>.  Spaces are used in indents with the '>' and '<' commands and
        when 'autoindent' is on.  To insert a real tab when 'expandtab' is
        on, use CTRL-V<Tab>.  See also :retab and ins-expandtab.
        This option is reset when the 'paste' option is set and restored when
        the 'paste' option is reset.
        NOTE: This option is reset when 'compatible' is set.

                                        'exrc' 'ex' 'noexrc' 'noex'
'exrc' 'ex'             boolean (default off)
                        global
        Enables the reading of .vimrc, .exrc and .gvimrc in the current
        directory.

        Setting this option is a potential security leak.  E.g., consider
        unpacking a package or fetching files from github, a .vimrc in there
        might be a trojan horse.  BETTER NOT SET THIS OPTION!
        Instead, define an autocommand in your .vimrc to set options for a
        matching directory.

        If you do switch this option on you should also consider setting the
        'secure' option (see initialization).
        Also see .vimrc and gui-init.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                'fileencoding' 'fenc' E213
'fileencoding' 'fenc'   string (default: "")
                        local to buffer
        Sets the character encoding for the file of this buffer.

        When 'fileencoding' is different from 'encoding', conversion will be
        done when writing the file.  For reading see below.
        When 'fileencoding' is empty, the same value as 'encoding' will be
        used (no conversion when reading or writing a file).
        No error will be given when the value is set, only when it is used,
        only when writing a file.
        Conversion will also be done when 'encoding' and 'fileencoding' are
        both a Unicode encoding and 'fileencoding' is not utf-8.  That's
        because internally Unicode is always stored as utf-8.
                WARNING: Conversion can cause loss of information!  When
                'encoding' is "utf-8" or another Unicode encoding, conversion
                is most likely done in a way that the reverse conversion
                results in the same text.  When 'encoding' is not "utf-8" some
                characters may be lost!

        See 'encoding' for the possible values.  Additionally, values may be
        specified that can be handled by the converter, see
        mbyte-conversion.

        When reading a file 'fileencoding' will be set from 'fileencodings'.
        To read a file in a certain encoding it won't work by setting
        'fileencoding', use the ++enc argument.  One exception: when
        'fileencodings' is empty the value of 'fileencoding' is used.
        For a new file the global value of 'fileencoding' is used.

        Prepending "8bit-" and "2byte-" has no meaning here, they are ignored.
        When the option is set, the value is converted to lowercase.  Thus
        you can set it with uppercase values too.  '_' characters are
        replaced with '-'.  If a name is recognized from the list for
        'encoding', it is replaced by the standard name.  For example
        "ISO8859-2" becomes "iso-8859-2".

        When this option is set, after starting to edit a file, the 'modified'
        option is set, because the file would be different when written.

        Keep in mind that changing 'fenc' from a modeline happens
        AFTER the text has been read, thus it applies to when the file will be
        written.  If you do set 'fenc' in a modeline, you might want to set
        'nomodified' to avoid not being able to ":q".

        This option can not be changed when 'modifiable' is off.

                                                        'fe'
        NOTE: Before version 6.0 this option specified the encoding for the
        whole of Vim, this was a mistake.  Now use 'encoding' instead.  The
        old short name was 'fe', which is no longer used.

                                        'fileencodings' 'fencs'
'fileencodings' 'fencs' string (default: "ucs-bom",
                                    "ucs-bom,utf-8,default,latin1" when
                                    'encoding' is set to a Unicode value)
                        global
        This is a list of character encodings considered when starting to edit
        an existing file.  When a file is read, Vim tries to use the first
        mentioned character encoding.  If an error is detected, the next one
        in the list is tried.  When an encoding is found that works,
        'fileencoding' is set to it.  If all fail, 'fileencoding' is set to
        an empty string, which means the value of 'encoding' is used.
                WARNING: Conversion can cause loss of information!  When
                'encoding' is "utf-8" (or one of the other Unicode variants)
                conversion is most likely done in a way that the reverse
                conversion results in the same text.  When 'encoding' is not
                "utf-8" some non-ASCII characters may be lost!  You can use
                the ++bad argument to specify what is done with characters
                that can't be converted.
        For an empty file or a file with only ASCII characters most encodings
        will work and the first entry of 'fileencodings' will be used (except
        "ucs-bom", which requires the BOM to be present).  If you prefer
        another encoding use an BufReadPost autocommand event to test if your
        preferred encoding is to be used.  Example:
                au BufReadPost * if search('\S', 'w') == 0 |
                        \ set fenc=iso-2022-jp | endif
        This sets 'fileencoding' to "iso-2022-jp" if the file does not contain
        non-blank characters.
        When the ++enc argument is used then the value of 'fileencodings' is
        not used.
        Note that 'fileencodings' is not used for a new file, the global value
        of 'fileencoding' is used instead.  You can set it with:
                :setglobal fenc=iso-8859-2
        This means that a non-existing file may get a different encoding than
        an empty file.
        The special value "ucs-bom" can be used to check for a Unicode BOM
        (Byte Order Mark) at the start of the file.  It must not be preceded
        by "utf-8" or another Unicode encoding for this to work properly.
        An entry for an 8-bit encoding (e.g., "latin1") should be the last,
        because Vim cannot detect an error, thus the encoding is always
        accepted.
        The special value "default" can be used for the encoding from the
        environment.  On MS-Windows this is the system encoding.  Otherwise
        this is the default value for 'encoding'.  It is useful when
        'encoding' is set to "utf-8" and your environment uses a non-latin1
        encoding, such as Russian.
        When 'encoding' is "utf-8" and a file contains an illegal byte
        sequence it won't be recognized as UTF-8.  You can use the 8g8
        command to find the illegal byte sequence.
        WRONG VALUES:                   WHAT'S WRONG:
                latin1,utf-8            "latin1" will always be used
                utf-8,ucs-bom,latin1    BOM won't be recognized in an utf-8
                                        file
                cp1250,latin1           "cp1250" will always be used
        If 'fileencodings' is empty, 'fileencoding' is not modified.
        See 'fileencoding' for the possible values.
        Setting this option does not have an effect until the next time a file
        is read.

                                        'fileformat' 'ff'
'fileformat' 'ff'       string (MS-Windows default: "dos",
                                Unix default: "unix")
                        local to buffer
        This gives the <EOL> of the current buffer, which is used for
        reading/writing the buffer from/to a file:
            dos     <CR><NL>
            unix    <NL>
            mac     <CR>
        When "dos" is used, CTRL-Z at the end of a file is ignored.
        See file-formats and file-read.
        For the character encoding of the file see 'fileencoding'.
        When 'binary' is set, the value of 'fileformat' is ignored, file I/O
        works like it was set to "unix".
        This option is set automatically when starting to edit a file and
        'fileformats' is not empty and 'binary' is off.
        When this option is set, after starting to edit a file, the 'modified'
        option is set, because the file would be different when written.
        This option can not be changed when 'modifiable' is off.
        For backwards compatibility: When this option is set to "dos",
        'textmode' is set, otherwise 'textmode' is reset.

                                        'fileformats' 'ffs'
'fileformats' 'ffs'     string (default:
                                Vim+Vi  MS-Windows: "dos,unix",
                                Vim     Unix: "unix,dos",
                                Vi      Cygwin: "unix,dos",
                                Vi      others: "")
                        global
        This gives the end-of-line (<EOL>) formats that will be tried when
        starting to edit a new buffer and when reading a file into an existing
        buffer:
        - When empty, the format defined with 'fileformat' will be used
          always.  It is not set automatically.
        - When set to one name, that format will be used whenever a new buffer
          is opened.  'fileformat' is set accordingly for that buffer.  The
          'fileformats' name will be used when a file is read into an existing
          buffer, no matter what 'fileformat' for that buffer is set to.
        - When more than one name is present, separated by commas, automatic
          <EOL> detection will be done when reading a file.  When starting to
          edit a file, a check is done for the <EOL>:
          1. If all lines end in <CR><NL>, and 'fileformats' includes "dos",
             'fileformat' is set to "dos".
          2. If a <NL> is found and 'fileformats' includes "unix", 'fileformat'
             is set to "unix".  Note that when a <NL> is found without a
             preceding <CR>, "unix" is preferred over "dos".
          3. If 'fileformat' has not yet been set, and if a <CR> is found, and
             if 'fileformats' includes "mac", 'fileformat' is set to "mac".
             This means that "mac" is only chosen when:
              "unix" is not present or no <NL> is found in the file, and
              "dos" is not present or no <CR><NL> is found in the file.
             Except: if "unix" was chosen, but there is a <CR> before
             the first <NL>, and there appear to be more <CR>s than <NL>s in
             the first few lines, "mac" is used.
          4. If 'fileformat' is still not set, the first name from
             'fileformats' is used.
          When reading a file into an existing buffer, the same is done, but
          this happens like 'fileformat' has been set appropriately for that
          file only, the option is not changed.
        When 'binary' is set, the value of 'fileformats' is not used.

        When Vim starts up with an empty buffer the first item is used.  You
        can overrule this by setting 'fileformat' in your .vimrc.

        For systems with a Dos-like <EOL> (<CR><NL>), when reading files that
        are ":source"ed and for vimrc files, automatic <EOL> detection may be
        done:
        - When 'fileformats' is empty, there is no automatic detection.  Dos
          format will be used.
        - When 'fileformats' is set to one or more names, automatic detection
          is done.  This is based on the first <NL> in the file: If there is a
          <CR> in front of it, Dos format is used, otherwise Unix format is
          used.
        Also see file-formats.
        For backwards compatibility: When this option is set to an empty
        string or one format (no comma is included), 'textauto' is reset,
        otherwise 'textauto' is set.
        NOTE: This option is set to the Vi default value when 'compatible' is
        set and to the Vim default value when 'compatible' is reset.

                'fileignorecase' 'fic' 'nofileignorecase' 'nofic'
'fileignorecase' 'fic'  boolean (default on for systems where case in file
                                 names is normally ignored)
                        global
        When set case is ignored when using file names and directories.
        See 'wildignorecase' for only ignoring case when doing completion.

                                        'filetype' 'ft'
'filetype' 'ft'         string (default: "")
                        local to buffer  local-noglobal
        When this option is set, the FileType autocommand event is triggered.
        All autocommands that match with the value of this option will be
        executed.  Thus the value of 'filetype' is used in place of the file
        name.
        Otherwise this option does not always reflect the current file type.
        This option is normally set when the file type is detected.  To enable
        this use the ":filetype on" command. :filetype
        Setting this option to a different value is most useful in a modeline,
        for a file for which the file type is not automatically recognized.
        Example, for in an IDL file:
                /* vim: set filetype=idl : */
        FileType filetypes
        When a dot appears in the value then this separates two filetype
        names, it should therefore not be used for a filetype.  Example:
                /* vim: set filetype=c.doxygen : */
        This will use the "c" filetype first, then the "doxygen" filetype.
        This works both for filetype plugins and for syntax files.  More than
        one dot may appear.
        This option is not copied to another buffer, independent of the 's' or
        'S' flag in 'cpoptions'.
        Only alphanumeric characters, '-' and '_' can be used.

                                                'fillchars' 'fcs'
'fillchars' 'fcs'       string  (default "vert:|,fold:-,eob:~,lastline:@")
                        global or local to window global-local
        Characters to fill the statuslines, vertical separators and special
        lines in the window.
        It is a comma-separated list of items.  Each item has a name, a colon
        and the value of that item: E1511

          item name     default         Used for
          stl           ' '             statusline of the current window
          stlnc         ' '             statusline of the non-current windows
          vert          '|'             vertical separators :vsplit
          fold          '-'             filling 'foldtext'
          foldopen      '-'             mark the beginning of a fold
          foldclose     '+'             show a closed fold
          foldsep       '|'             open fold middle character
          diff          '-'             deleted lines of the 'diff' option
          eob           '~'             empty lines below the end of a buffer
          lastline      '@'             'display' contains lastline/truncate

        Any one that is omitted will fall back to the default.

        Example:
            :set fillchars=stl:\ ,stlnc:\ ,vert:\|,fold:-,diff:-

        For the "stl", "stlnc", "foldopen", "foldclose" and "foldsep" items
        single-byte and multibyte characters are supported.  But double-width
        characters are not supported. E1512

        The highlighting used for these items:
          item name     highlight group
          stl           StatusLine              hl-StatusLine
          stlnc         StatusLineNC            hl-StatusLineNC
          vert          VertSplit               hl-VertSplit
          fold          Folded                  hl-Folded
          diff          DiffDelete              hl-DiffDelete
          eob           EndOfBuffer             hl-EndOfBuffer
          lastline      NonText                 hl-NonText

                                                'findfunc' 'ffu' E1514
'findfunc' 'ffu'        string  (default empty)
                        global or local to buffer global-local
                        {not available when compiled without the +eval
                        feature}
        Function that is called to obtain the filename(s) for the :find
        command.  When this option is empty, the internal file-searching
        mechanism is used.

        The value can be the name of a function, a lambda or a Funcref.
        See option-value-function for more information.

        The function is called with two arguments.  The first argument is a
        String and is the :find command argument.  The second argument is
        a Boolean and is set to v:true when the function is called to get
        a List of command-line completion matches for the :find command.
        The function should return a List of strings.

        The function is called only once per :find command invocation.
        The function can process all the directories specified in 'path'.

        If a match is found, the function should return a List containing
        one or more file names.  If a match is not found, the function
        should return an empty List.

        If any errors are encountered during the function invocation, an
        empty List is used as the return value.

        It is not allowed to change text or jump to another window while
        executing the 'findfunc' textlock.

        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

        Examples:

            " Use glob()
            func FindFuncGlob(cmdarg, cmdcomplete)
                let pat = a:cmdcomplete ? $'{a:cmdarg}*' : a:cmdarg
                return glob(pat, v:false, v:true)
            endfunc
            set findfunc=FindFuncGlob

            " Use the 'git ls-files' output
            func FindGitFiles(cmdarg, cmdcomplete)
                let fnames = systemlist('git ls-files')
                return fnames->filter('v:val =~? a:cmdarg')
            endfunc
            set findfunc=FindGitFiles

                'fixendofline' 'fixeol' 'nofixendofline' 'nofixeol'
'fixendofline' 'fixeol' boolean (default on)
                        local to buffer
        When writing a file and this option is on, <EOL> at the end of file
        will be restored if missing.  Turn this option off if you want to
        preserve the situation from the original file.
        When the 'binary' option is set the value of this option doesn't
        matter.
        See the 'endofline' option.
        See eol-and-eof for example settings.

                                        'fkmap' 'fk' 'nofkmap' 'nofk'
'fkmap' 'fk'            boolean (default off)
                        global
                        {only available when compiled with the +rightleft
                        feature}
        This option was for using Farsi, which has been removed.  See
        farsi.txt.

                                                'foldclose' 'fcl'
'foldclose' 'fcl'       string (default "")
                        global
                        {not available when compiled without the +folding
                        feature}
        When set to "all", a fold is closed when the cursor isn't in it and
        its level is higher than 'foldlevel'.  Useful if you want folds to
        automatically close when moving out of them.

                                                'foldcolumn' 'fdc'
'foldcolumn' 'fdc'      number (default 0)
                        local to window
                        {not available when compiled without the +folding
                        feature}
        When non-zero, a column with the specified width is shown at the side
        of the window which indicates open and closed folds.  The maximum
        value is 12.
        See folding.

                        'foldenable' 'fen' 'nofoldenable' 'nofen'
'foldenable' 'fen'      boolean (default on)
                        local to window
                        {not available when compiled without the +folding
                        feature}
        When off, all folds are open.  This option can be used to quickly
        switch between showing all text unfolded and viewing the text with
        folds (including manually opened or closed folds).  It can be toggled
        with the zi command.  The 'foldcolumn' will remain blank when
        'foldenable' is off.
        This option is set by commands that create a new fold or close a fold.
        See folding.

                                                'foldexpr' 'fde'
'foldexpr' 'fde'        string (default: "0")
                        local to window
                        {not available when compiled without the +folding
                        or +eval features}
        The expression used for when 'foldmethod' is "expr".  It is evaluated
        for each line to obtain its fold level.  The context is set to the
        script where 'foldexpr' was set, script-local items can be accessed.
        See fold-expr for the usage.

        The expression will be evaluated in the sandbox if set from a
        modeline, see sandbox-option.
        This option can't be set from a modeline when the 'diff' option is
        on or the 'modelineexpr' option is off.

        It is not allowed to change text or jump to another window while
        evaluating 'foldexpr' textlock.

                                                'foldignore' 'fdi'
'foldignore' 'fdi'      string (default: "#")
                        local to window
                        {not available when compiled without the +folding
                        feature}
        Used only when 'foldmethod' is "indent".  Lines starting with
        characters in 'foldignore' will get their fold level from surrounding
        lines.  White space is skipped before checking for this character.
        The default "#" works well for C programs.  See fold-indent.

                                                'foldlevel' 'fdl'
'foldlevel' 'fdl'       number (default: 0)
                        local to window
                        {not available when compiled without the +folding
                        feature}
        Sets the fold level: Folds with a higher level will be closed.
        Setting this option to zero will close all folds.  Higher numbers will
        close fewer folds.
        This option is set by commands like zmzM and zR.
        See fold-foldlevel.

                                                'foldlevelstart' 'fdls'
'foldlevelstart' 'fdls' number (default: -1)
                        global
                        {not available when compiled without the +folding
                        feature}
        Sets 'foldlevel' when starting to edit another buffer in a window.
        Useful to always start editing with all folds closed (value zero),
        some folds closed (one) or no folds closed (99).
        This is done before reading any modeline, thus a setting in a modeline
        overrules this option.  Starting to edit a file for diff-mode also
        ignores this option and closes all folds.
        It is also done before BufReadPre autocommands, to allow an autocmd to
        overrule the 'foldlevel' value for specific files.
        When the value is negative, it is not used.

                                                'foldmarker' 'fmr' E536
'foldmarker' 'fmr'      string (default: "{{{,}}}")
                        local to window
                        {not available when compiled without the +folding
                        feature}
        The start and end marker used when 'foldmethod' is "marker".  There
        must be one comma, which separates the start and end marker.  The
        marker is a literal string (a regular expression would be too slow).
        See fold-marker.

                                                'foldmethod' 'fdm'
'foldmethod' 'fdm'      string (default: "manual")
                        local to window
                        {not available when compiled without the +folding
                        feature}
        The kind of folding used for the current window.  Possible values:
        fold-manual   manual      Folds are created manually.
        fold-indent   indent      Lines with equal indent form a fold.
        fold-expr     expr        'foldexpr' gives the fold level of a line.
        fold-marker   marker      Markers are used to specify folds.
        fold-syntax   syntax      Syntax highlighting items specify folds.
        fold-diff     diff        Fold text that is not changed.

                                                'foldminlines' 'fml'
'foldminlines' 'fml'    number (default: 1)
                        local to window
                        {not available when compiled without the +folding
                        feature}
        Sets the number of screen lines above which a fold can be displayed
        closed.  Also for manually closed folds.  With the default value of
        one a fold can only be closed if it takes up two or more screen lines.
        Set to zero to be able to close folds of just one screen line.
        Note that this only has an effect on what is displayed.  After using
        "zc" to close a fold, which is displayed open because it's smaller
        than 'foldminlines', a following "zc" may close a containing fold.

                                                'foldnestmax' 'fdn'
'foldnestmax' 'fdn'     number (default: 20)
                        local to window
                        {not available when compiled without the +folding
                        feature}
        Sets the maximum nesting of folds for the "indent" and "syntax"
        methods.  This avoids that too many folds will be created.  Using more
        than 20 doesn't work, because the internal limit is 20.

                                                'foldopen' 'fdo'
'foldopen' 'fdo'        string (default: "block,hor,mark,percent,quickfix,
                                                             search,tag,undo")
                        global
                        {not available when compiled without the +folding
                        feature}
        Specifies for which type of commands folds will be opened, if the
        command moves the cursor into a closed fold.  It is a comma-separated
        list of items.
        NOTE: When the command is part of a mapping this option is not used.
        Add the zv command to the mapping to get the same effect.
        (rationale: the mapping may want to control opening folds itself)

                item            commands
                all             any
                block           "(", "{", "[[", "[{", etc.
                hor             horizontal movements: "l", "w", "fx", etc.
                insert          any command in Insert mode
                jump            far jumps: "G", "gg", etc.
                mark            jumping to a mark: "'m", CTRL-O, etc.
                percent         "%"
                quickfix        ":cn", ":crew", ":make", etc.
                search          search for a pattern: "/", "n", "*", "gd", etc.
                                (not for a search pattern in a ":" command)
                                Also for [s and ]s.
                tag             jumping to a tag: ":ta", CTRL-T, etc.
                undo            undo or redo: "u" and CTRL-R
        When a movement command is used for an operator (e.g., "dl" or "y%")
        this option is not used.  This means the operator will include the
        whole closed fold.
        Note that vertical movements are not here, because it would make it
        very difficult to move onto a closed fold.
        In insert mode the folds containing the cursor will always be open
        when text is inserted.
        To close folds you can re-apply 'foldlevel' with the zx command or
        set the 'foldclose' option to "all".

                                                'foldtext' 'fdt'
'foldtext' 'fdt'        string (default: "foldtext()")
                        local to window
                        {not available when compiled without the +folding
                        feature}
        An expression which is used to specify the text displayed for a closed
        fold.  The context is set to the script where 'foldexpr' was set,
        script-local items can be accessed.  See fold-foldtext for the
        usage.

        The expression will be evaluated in the sandbox if set from a
        modeline, see sandbox-option.
        This option cannot be set in a modeline when 'modelineexpr' is off.

        It is not allowed to change text or jump to another window while
        evaluating 'foldtext' textlock.

                                                'formatexpr' 'fex'
'formatexpr' 'fex'      string (default "")
                        local to buffer
                        {not available when compiled without the +eval
                        feature}
        Expression which is evaluated to format a range of lines for the gq
        operator or automatic formatting (see 'formatoptions').  When this
        option is empty 'formatprg' is used.

        The v:lnum  variable holds the first line to be formatted.
        The v:count variable holds the number of lines to be formatted.
        The v:char  variable holds the character that is going to be
                      inserted if the expression is being evaluated due to
                      automatic formatting.  This can be empty.  Don't insert
                      it yet!

        Example:
                :set formatexpr=mylang#Format()
        This will invoke the mylang#Format() function in the
        autoload/mylang.vim file in 'runtimepath'autoload

        The advantage of using a function call without arguments is that it is
        faster, see expr-option-function.

        The expression is also evaluated when 'textwidth' is set and adding
        text beyond that limit.  This happens under the same conditions as
        when internal formatting is used.  Make sure the cursor is kept in the
        same spot relative to the text then!  The mode() function will
        return "i" or "R" in this situation.

        When the expression evaluates to non-zero Vim will fall back to using
        the internal format mechanism.

        If the expression starts with s: or <SID>, then it is replaced with
        the script ID (local-function). Example:
                set formatexpr=s:MyFormatExpr()
                set formatexpr=<SID>SomeFormatExpr()
        Otherwise, the expression is evaluated in the context of the script
        where the option was set, thus script-local items are available.

        The expression will be evaluated in the sandbox when set from a
        modeline, see sandbox-option.  That stops the option from working,
        since changing the buffer text is not allowed.
        This option cannot be set in a modeline when 'modelineexpr' is off.
        NOTE: This option is set to "" when 'compatible' is set.

                                        'formatlistpat' 'flp'
'formatlistpat' 'flp'   string (default: "^\s*\d\+[\]:.)}\t ]\s*")
                        local to buffer
        A pattern that is used to recognize a list header.  This is used for
        the "n" flag in 'formatoptions'.
        The pattern must match exactly the text that will be the indent for
        the line below it.  You can use /\ze to mark the end of the match
        while still checking more characters.  There must be a character
        following the pattern, when it matches the whole line it is handled
        like there is no match.
        The default recognizes a number, followed by an optional punctuation
        character and white space.

                                        'formatoptions' 'fo'
'formatoptions' 'fo'    string (Vim default: "tcq", Vi default: "vt")
                        local to buffer
        This is a sequence of letters which describes how automatic
        formatting is to be done.
        See fo-table for possible values and gq for how to format text.
        When the 'paste' option is on, no formatting is done (like
        'formatoptions' is empty).  Commas can be inserted for readability.
        To avoid problems with flags that are added in the future, use the
        "+=" and "-=" feature of ":set" add-option-flags.
        NOTE: This option is set to the Vi default value when 'compatible' is
        set and to the Vim default value when 'compatible' is reset.

                                                'formatprg' 'fp'
'formatprg' 'fp'        string (default "")
                        global or local to buffer global-local
        The name of an external program that will be used to format the lines
        selected with the gq operator.  The program must take the input on
        stdin and produce the output on stdout.  The Unix program "fmt" is
        such a program.
        If the 'formatexpr' option is not empty it will be used instead.
        Otherwise, if 'formatprg' option is an empty string, the internal
        format function will be used C-indenting.
        Environment variables are expanded :set_env.  See option-backslash
        about including spaces and backslashes.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                        'fsync' 'fs' 'nofsync' 'nofs'
'fsync' 'fs'            boolean (default on)
                        global
        When on, the library function fsync() will be called after writing a
        file.  This will flush a file to disk, ensuring that it is safely
        written even on filesystems which do metadata-only journaling.  This
        will force the harddrive to spin up on Linux systems running in laptop
        mode, so it may be undesirable in some situations.  Be warned that
        turning this off increases the chances of data loss after a crash.  On
        systems without an fsync() implementation, this variable is always
        off.
        Also see 'swapsync' for controlling fsync() on swap files.
        'fsync' also applies to writefile() (unless a flag is used to
        overrule it) and when writing undo files (see undo-persistence).
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                   'gdefault' 'gd' 'nogdefault' 'nogd'
'gdefault' 'gd'         boolean (default off)
                        global
        When on, the ":substitute" flag 'g' is default on.  This means that
        all matches in a line are substituted instead of one.  When a 'g' flag
        is given to a ":substitute" command, this will toggle the substitution
        of all or one match.  See complex-change.

                command         'gdefault' on   'gdefault' off
                :s///             subst. all      subst. one
                :s///g            subst. one      subst. all
                :s///gg           subst. all      subst. one

        NOTE: This option is reset when 'compatible' is set.
        Setting this option may break plugins that rely on the default
        behavior of the 'g' flag. This will also make the 'g' flag have the
        opposite effect of that documented in :s_g.
        This option is not used in Vim9 script.

                                                'grepformat' 'gfm'
'grepformat' 'gfm'      string  (default "%f:%l:%m,%f:%l%m,%f  %l%m")
                        global
        Format to recognize for the ":grep" command output.
        This is a scanf-like string that uses the same format as the
        'errorformat' option: see errorformat.

                                                'grepprg' 'gp'
'grepprg' 'gp'          string  (default "grep -n ",
                                        Unix: "grep -n $* /dev/null",
                                        Win32: "findstr /n" or "grep -n",
                                                      VMS: "SEARCH/NUMBERS ")
                        global or local to buffer global-local
        Program to use for the :grep command.  This option may contain '%'
        and '#' characters, which are expanded like when used in a command-
        line.  The placeholder "$*" is allowed to specify where the arguments
        will be included.  Environment variables are expanded :set_env.  See
        option-backslash about including spaces and backslashes.
        When your "grep" accepts the "-H" argument, use this to make ":grep"
        also work well with a single file:
                :set grepprg=grep\ -nH
        Special value: When 'grepprg' is set to "internal" the :grep command
        works like :vimgrep:lgrep like :lvimgrep:grepadd like
        :vimgrepadd and :lgrepadd like :lvimgrepadd.
        See also the section :make_makeprg, since most of the comments there
        apply equally to 'grepprg'.
        For Win32, the default is "findstr /n" if "findstr.exe" can be found,
        otherwise it's "grep -n".
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                        'guicursor' 'gcr' E545 E546 E548 E549
'guicursor' 'gcr'       string  (default "n-v-c:block-Cursor/lCursor,
                                        ve:ver35-Cursor,
                                        o:hor50-Cursor,
                                        i-ci:ver25-Cursor/lCursor,
                                        r-cr:hor20-Cursor/lCursor,
                                        sm:block-Cursor
                                        -blinkwait175-blinkoff150-blinkon175",
                                for Win32 console:
                                        "n-v-c:block,o:hor50,i-ci:hor15,
                                        r-cr:hor30,sm:block")
                        global
                        {only available when compiled with GUI enabled, and
                        for Win32 console}
        This option tells Vim what the cursor should look like in different
        modes.  It fully works in the GUI.  In a Win32 console, only the
        height of the cursor can be changed.  This can be done by specifying a
        block cursor, or a percentage for a vertical or horizontal cursor.
        For a console the 't_SI''t_SR', and 't_EI' escape sequences are
        used.

        The option is a comma-separated list of parts.  Each part consist of a
        mode-list and an argument-list:
                mode-list:argument-list,mode-list:argument-list,..
        The mode-list is a dash separated list of these modes:
                n       Normal mode
                v       Visual mode
                ve      Visual mode with 'selection' "exclusive" (same as 'v',
                        if not specified)
                o       Operator-pending mode
                i       Insert mode
                r       Replace mode
                c       Command-line Normal (append) mode
                ci      Command-line Insert mode
                cr      Command-line Replace mode
                sm      showmatch in Insert mode
                a       all modes
        The argument-list is a dash separated list of these arguments:
                hor{N}  horizontal bar, {N} percent of the character height
                ver{N}  vertical bar, {N} percent of the character width
                block   block cursor, fills the whole character
                        [only one of the above three should be present]
                blinkwait{N}                            cursor-blinking
                blinkon{N}
                blinkoff{N}
                        blink times for cursor: blinkwait is the delay before
                        the cursor starts blinking, blinkon is the time that
                        the cursor is shown and blinkoff is the time that the
                        cursor is not shown.  The times are in msec.  When one
                        of the numbers is zero, there is no blinking.  The
                        default is: "blinkwait700-blinkon400-blinkoff250".
                        These numbers are used for a missing entry.  This
                        means that blinking is enabled by default.  To switch
                        blinking off you can use "blinkon0".  The cursor only
                        blinks when Vim is waiting for input, not while
                        executing a command.
                        To make the cursor blink in an xterm, see
                        xterm-blink.
                {group-name}
                        a highlight group name, that sets the color and font
                        for the cursor
                {group-name}/{group-name}
                        Two highlight group names, the first is used when
                        no language mappings are used, the other when they
                        are. language-mapping

        Examples of parts:
           n-c-v:block-nCursor  in Normal, Command-line and Visual mode, use a
                                block cursor with colors from the "nCursor"
                                highlight group
           i-ci:ver30-iCursor-blinkwait300-blinkon200-blinkoff150
                                In Insert and Command-line Insert mode, use a
                                30% vertical bar cursor with colors from the
                                "iCursor" highlight group.  Blink a bit
                                faster.

        The 'a' mode is different.  It will set the given argument-list for
        all modes.  It does not reset anything to defaults.  This can be used
        to do a common setting for all modes.  For example, to switch off
        blinking: "a:blinkon0"

        Examples of cursor highlighting:
            :highlight Cursor gui=reverse guifg=NONE guibg=NONE
            :highlight Cursor gui=NONE guifg=bg guibg=fg

                                        'guifont' 'gfn'
                                                   E235 E596
'guifont' 'gfn'         string  (default "")
                        global
                        {only available when compiled with GUI enabled}
        This is a list of fonts which will be used for the GUI version of Vim.
        In its simplest form the value is just one font name.
        See gui-font for the details.

                                        'guifontset' 'gfs'
                                        E250 E252 E234 E597 E598
'guifontset' 'gfs'      string  (default "")
                        global
                        {only available when compiled with GUI enabled and
                        with the +xfontset feature}
                        {not available in the GTK+ GUI}
        When not empty, specifies two (or more) fonts to be used.  The first
        one for normal English, the second one for your special language.  See
        xfontset.

                                'guifontwide' 'gfw' E231 E533 E534
'guifontwide' 'gfw'     string  (default "")
                        global
                        {only available when compiled with GUI enabled}
        When not empty, specifies a comma-separated list of fonts to be used
        for double-width characters.  The first font that can be loaded is
        used.  See gui-fontwide.

                                                'guiheadroom' 'ghr'
'guiheadroom' 'ghr'     number  (default 50)
                        global
                        {only for GTK and X11 GUI}
        The number of pixels subtracted from the screen height when fitting
        the GUI window on the screen.  Set this before the GUI is started,
        e.g., in your gvimrc file.  When zero, the whole screen height will
        be used by the window.  When positive, the specified number of pixel
        lines will be left for window decorations and other items on the
        screen.  Set it to a negative value to allow windows taller than the
        screen.

                                                'guiligatures' 'gli' E1243
'guiligatures' 'gli'    string  (default "")
                        global
                        {only for GTK and Win32 GUI}
        List of ASCII characters that, when combined together, can create more
        complex shapes. Each character must be a printable ASCII character
        with a value in the 32-127 range.
        Example:
                :set guiligatures=!\"#$%&()*+-./:<=>?@[]^_{\|~
        Changing this option updates screen output immediately. Set it to an
        empty string to disable ligatures.

                                                'guioptions' 'go'
'guioptions' 'go'       string  (default "egmrLtT"   (MS-Windows,
                                           "t" is removed in defaults.vim),
                                         "aegimrLtT" (GTK and Motif),
                                         )
                        global
                        {only available when compiled with GUI enabled}
        This option only has an effect in the GUI version of Vim.  It is a
        sequence of letters which describes what components and options of the
        GUI should be used.
        To avoid problems with flags that are added in the future, use the
        "+=" and "-=" feature of ":set" add-option-flags.

        Valid characters are as follows:
                                                                'go-!'
          '!'   External commands are executed in a terminal window.  Without
                this flag the MS-Windows GUI will open a console window to
                execute the command.  The Unix GUI will simulate a dumb
                terminal to list the command output.
                The terminal window will be positioned at the bottom, and grow
                upwards as needed.
                                                                'go-a'
          'a'   Autoselect:  If present, then whenever VISUAL mode is started,
                or the Visual area extended, Vim tries to become the owner of
                the windowing system's global selection.  This means that the
                Visually highlighted text is available for pasting into other
                applications as well as into Vim itself.  When the Visual mode
                ends, possibly due to an operation on the text, or when an
                application wants to paste the selection, the highlighted text
                is automatically yanked into the "* selection register.
                Thus the selection is still available for pasting into other
                applications after the VISUAL mode has ended.
                    If not present, then Vim won't become the owner of the
                windowing system's global selection unless explicitly told to
                by a yank or delete operation for the "* register.
                The same applies to the modeless selection.
                                                                'go-P'
          'P'   Like autoselect but using the "+ register instead of the "*
                register.
                                                                'go-A'
          'A'   Autoselect for the modeless selection.  Like 'a', but only
                applies to the modeless selection.

                    'guioptions'   autoselect Visual  autoselect modeless
                         ""              -                       -
                         "a"            yes                     yes
                         "A"             -                      yes
                         "aA"           yes                     yes

                When using a terminal see the 'clipboard' option.

                                                                'go-c'
          'c'   Use console dialogs instead of popup dialogs for simple
                choices.
                                                                'go-d'
          'd'   Use dark theme variant if available. Currently only works for
                GTK+ GUI.
                                                                'go-e'
          'e'   Add tab pages when indicated with 'showtabline'.
                'guitablabel' can be used to change the text in the labels.
                When 'e' is missing a non-GUI tab pages line may be used.
                The GUI tabs are only supported on some systems, currently
                GTK, Motif, Mac OS/X, Haiku, and MS-Windows.
                                                                'go-f'
          'f'   Foreground: Don't use fork() to detach the GUI from the shell
                where it was started.  Use this for programs that wait for the
                editor to finish (e.g., an e-mail program).  Alternatively you
                can use "gvim -f" or ":gui -f" to start the GUI in the
                foreground.  gui-fork
                Note: Set this option in the vimrc file.  The forking may have
                happened already when the gvimrc file is read.
                                                                'go-i'
          'i'   Use a Vim icon.  For GTK with KDE it is used in the left-upper
                corner of the window.  It's black&white on non-GTK, because of
                limitations of X11.  For a color icon, see X11-icon.
                                                                'go-m'
          'm'   Menu bar is present.
                                                                'go-M'
          'M'   The system menu "$VIMRUNTIME/menu.vim" is not sourced.  Note
                that this flag must be added in the .vimrc file, before
                switching on syntax or filetype recognition (when the gvimrc
                file is sourced the system menu has already been loaded; the
                :syntax on and :filetype on commands load the menu too).
                                                                'go-g'
          'g'   Grey menu items: Make menu items that are not active grey.  If
                'g' is not included inactive menu items are not shown at all.
                                                                'go-t'
          't'   Include tearoff menu items.  Currently only works for Win32,
                GTK+, and Motif 1.2 GUI.
                                                                'go-T'
          'T'   Include Toolbar.  Currently only in Win32, GTK+, Motif and
                Photon GUIs.
                                                                'go-r'
          'r'   Right-hand scrollbar is always present.
                                                                'go-R'
          'R'   Right-hand scrollbar is present when there is a vertically
                split window.
                                                                'go-l'
          'l'   Left-hand scrollbar is always present.
                                                                'go-L'
          'L'   Left-hand scrollbar is present when there is a vertically
                split window.
                                                                'go-b'
          'b'   Bottom (horizontal) scrollbar is present.  Its size depends on
                the longest visible line, or on the cursor line if the 'h'
                flag is included. gui-horiz-scroll
                                                                'go-h'
          'h'   Limit horizontal scrollbar size to the length of the cursor
                line.  Reduces computations. gui-horiz-scroll

        And yes, you may even have scrollbars on the left AND the right if
        you really want to :-).  See gui-scrollbars for more information.

                                                                'go-v'
          'v'   Use a vertical button layout for dialogs.  When not included,
                a horizontal layout is preferred, but when it doesn't fit a
                vertical layout is used anyway.  Not supported in GTK 3.
                                                                'go-p'
          'p'   Use Pointer callbacks for X11 GUI.  This is required for some
                window managers.  If the cursor is not blinking or hollow at
                the right moment, try adding this flag.  This must be done
                before starting the GUI.  Set it in your gvimrc.  Adding or
                removing it after the GUI has started has no effect.
                                                                'go-F'
          'F'   Add a footer.  Only for Motif.  See gui-footer.
                                                                'go-k'
          'k'   Keep the GUI window size when adding/removing a scrollbar, or
                toolbar, tabline, etc.  Instead, the behavior is similar to
                when the window is maximized and will adjust 'lines' and
                'columns' to fit to the window.  Without the 'k' flag Vim will
                try to keep 'lines' and 'columns' the same when adding and
                removing GUI components.

                                                'guipty' 'noguipty'
'guipty'                boolean (default on)
                        global
                        {only available when compiled with GUI enabled}
        Only in the GUI: If on, an attempt is made to open a pseudo-tty for
        I/O to/from shell commands.  See gui-pty.

                                                'guitablabel' 'gtl'
'guitablabel' 'gtl'     string  (default empty)
                        global
                        {only available when compiled with GUI enabled}
        When non-empty describes the text to use in a label of the GUI tab
        pages line.  When empty and when the result is empty Vim will use a
        default label.  See setting-guitablabel for more info.

        The format of this option is like that of 'statusline'.
        'guitabtooltip' is used for the tooltip, see below.
        The expression will be evaluated in the sandbox when set from a
        modeline, see sandbox-option.
        This option cannot be set in a modeline when 'modelineexpr' is off.

        Only used when the GUI tab pages line is displayed.  'e' must be
        present in 'guioptions'.  For the non-GUI tab pages line 'tabline' is
        used.

                                                'guitabtooltip' 'gtt'
'guitabtooltip' 'gtt'   string  (default empty)
                        global
                        {only available when compiled with GUI enabled}
        When non-empty describes the text to use in a tooltip for the GUI tab
        pages line.  When empty Vim will use a default tooltip.
        This option is otherwise just like 'guitablabel' above.
        You can include a line break.  Simplest method is to use :let:
                :let &guitabtooltip = "line one\nline two"


                                                'helpfile' 'hf'
'helpfile' 'hf'         string  (default (MS-Windows) "$VIMRUNTIME\doc\help.txt"
                                         (others) "$VIMRUNTIME/doc/help.txt")
                        global
        Name of the main help file.  All distributed help files should be
        placed together in one directory.  Additionally, all "doc" directories
        in 'runtimepath' will be used.
        Environment variables are expanded :set_env.  For example:
        "$VIMRUNTIME/doc/help.txt".  If $VIMRUNTIME is not set, $VIM is also
        tried.  Also see $VIMRUNTIME and option-backslash about including
        spaces and backslashes.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                                'helpheight' 'hh'
'helpheight' 'hh'       number  (default 20)
                        global
        Minimal initial height of the help window when it is opened with the
        ":help" command.  The initial height of the help window is half of the
        current window, or (when the 'ea' option is on) the same as other
        windows.  When the height is less than 'helpheight', the height is
        set to 'helpheight'.  Set to zero to disable.

                                                'helplang' 'hlg'
'helplang' 'hlg'        string  (default: messages language or empty)
                        global
                        {only available when compiled with the +multi_lang
                        feature}
        Comma-separated list of languages.  Vim will use the first language
        for which the desired help can be found.  The English help will always
        be used as a last resort.  You can add "en" to prefer English over
        another language, but that will only find tags that exist in that
        language and not in the English help.
        Example:
                :set helplang=de,it
        This will first search German, then Italian and finally English help
        files.
        When using CTRL-] and ":help!" in a non-English help file Vim will
        try to find the tag in the current language before using this option.
        See help-translated.

                                     'hidden' 'hid' 'nohidden' 'nohid'
'hidden' 'hid'          boolean (default off)
                        global
        When off a buffer is unloaded when it is abandoned.  When on a
        buffer becomes hidden when it is abandoned.  If the buffer is still
        displayed in another window, it does not become hidden, of course.

        The commands that move through the buffer list sometimes make a buffer
        hidden even if the 'hidden' option is off when these three are true:
        - the buffer is modified
        - 'autowrite' is off or writing is not possible
        - the '!' flag was used
        Also see windows.txt.

        To only make one buffer hidden use the 'bufhidden' option.
        This option is set for one command with ":hide {command}:hide.
        WARNING: It's easy to forget that you have changes in hidden buffers.
        Think twice when using ":q!" or ":qa!".

                                                'highlight' 'hl'
'highlight' 'hl'        string  (default (as a single string):
                                     "8:SpecialKey,~:EndOfBuffer,@:NonText,
                                     d:Directory,e:ErrorMsg,i:IncSearch,
                                     l:Search,m:MoreMsg,M:ModeMsg,n:LineNr,
                                     a:LineNrAbove,b:LineNrBelow,
                                     N:CursorLineNr,r:Question,s:StatusLine,
                                     S:StatusLineNC,c:VertSplit,t:Title,
                                     v:Visual,V:VisualNOS,w:WarningMsg,
                                     W:WildMenu,f:Folded,F:FoldColumn,
                                     A:DiffAdd,C:DiffChange,D:DiffDelete,
                                     T:DiffText,>:SignColumn,-:Conceal,
                                     B:SpellBad,P:SpellCap,R:SpellRare,
                                     L:SpellLocal,+:Pmenu,=:PmenuSel,
                                     k:PmenuMatch,<:PmenuMatchSel,
                                     [:PmenuKind,]:PmenuKindSel,
                                     {:PmenuExtra,}:PmenuExtraSel,
                                     x:PmenuSbar,X:PmenuThumb,*:TabLine,
                                     #:TabLineSel,_:TabLineFill,!:CursorColumn,
                                     .:CursorLine,o:ColorColumn,q:QuickFixLine,
                                     z:StatusLineTerm,Z:StatusLineTermNC,
                                     g:MsgArea")
                        global
        This option can be used to set highlighting mode for various
        occasions.  It is a comma-separated list of character pairs.  The
        first character in a pair gives the occasion, the second the mode to
        use for that occasion.  The occasions are:
        hl-SpecialKey  8  Meta and special keys listed with ":map"
        hl-EndOfBuffer   ~  lines after the last line in the buffer
        hl-NonText     @  '@' at the end of the window and
                            characters from 'showbreak'
        hl-Directory   d  directories in CTRL-D listing and other special
                            things in listings
        hl-ErrorMsg    e  error messages
                         h  (obsolete, ignored)
        hl-IncSearch   i  'incsearch' highlighting
        hl-CurSearch   y  current instance of last search pattern
        hl-Search      l  last search pattern highlighting (see 'hlsearch')
        hl-MoreMsg     m  more-prompt
        hl-ModeMsg     M  Mode (e.g., "-- INSERT --")
        hl-MsgArea     g  Command-line and message area
        hl-LineNr      n  line number for ":number" and ":#" commands, and
                            when 'number' or 'relativenumber' option is set.
        hl-LineNrAbove   a  line number above the cursor for when the
                            'relativenumber' option is set.
        hl-LineNrBelow   b  line number below the cursor for when the
                            'relativenumber' option is set.
        hl-CursorLineNr  N like n for when 'cursorline' or 'relativenumber' is
                            set.
        hl-Question    r  hit-enter prompt and yes/no questions
        hl-StatusLine  s  status line of current window status-line
        hl-StatusLineNC  S  status lines of not-current windows
        hl-Title       t  Titles for output from ":set all", ":autocmd" etc.
        hl-VertSplit   c  column used to separate vertically split windows
        hl-Visual      v  Visual mode
        hl-VisualNOS   V  Visual mode when Vim does is "Not Owning the
                            Selection" Only X11 Gui's gui-x11 and
                            xterm-clipboard.
        hl-WarningMsg  w  warning messages
        hl-WildMenu    W  wildcard matches displayed for 'wildmenu'
        hl-Folded      f  line used for closed folds
        hl-FoldColumn  F  'foldcolumn'
        hl-DiffAdd     A  added line in diff mode
        hl-DiffChange  C  changed line in diff mode
        hl-DiffDelete  D  deleted line in diff mode
        hl-DiffText    T  inserted text in diff mode
        hl-SignColumn  >  column used for signs
        hl-Conceal     -  the placeholders used for concealed characters
                            (see 'conceallevel')
        hl-SpellBad    B  misspelled word spell
        hl-SpellCap    P  word that should start with capital spell
        hl-SpellRare   R  rare word spell
        hl-SpellLocal  L  word from other region spell
        hl-Pmenu       +  popup menu normal line
        hl-PmenuSel    =  popup menu selected line
        hl-PmenuKind   [  popup menu "kind" normal line
        hl-PmenuKindSel  ]  popup menu "kind" selected line
        hl-PmenuExtra  {  popup menu "extra" normal line
        hl-PmenuExtraSel }  popup menu "extra" selected line
        hl-PmenuSbar   x  popup menu scrollbar
        hl-PmenuThumb  X  popup menu scrollbar thumb
        hl-PmenuMatch  k  popup menu matched text
        hl-PmenuMatchSel <  popup menu matched text in selected line

        The display modes are:
                r       reverse         (termcap entry "mr" and "me")
                i       italic          (termcap entry "ZH" and "ZR")
                b       bold            (termcap entry "md" and "me")
                s       standout        (termcap entry "so" and "se")
                u       underline       (termcap entry "us" and "ue")
                c       undercurl       (termcap entry "Us" and "Ce")
                2       double underline (termcap entry "Ds" and "Ce")
                d       dotted underline (termcap entry "ds" and "Ce")
                =       dashed underline (termcap entry "Ds" and "Ce")
                t       strikethrough   (termcap entry "Ts" and "Te")
                n       no highlighting
                -       no highlighting
                :       use a highlight group
        The default is used for occasions that are not included.
        If you want to change what the display modes do, see dos-colors
        for an example.
        When using the ':' display mode, this must be followed by the name of
        a highlight group.  A highlight group can be used to define any type
        of highlighting, including using color.  See :highlight on how to
        define one.  The default uses a different group for each occasion.
        See highlight-default for the default highlight groups.

                                                'history' 'hi'
'history' 'hi'          number  (Vim default: 200, Vi default: 0)
                        global
        A history of ":" commands, and a history of previous search patterns
        is remembered.  This option decides how many entries may be stored in
        each of these histories (see cmdline-editing and 'msghistory' for
        the number of messages to remember).
        The maximum value is 10000.
        NOTE: This option is set to the Vi default value when 'compatible' is
        set and to the Vim default value when 'compatible' is reset.

                                         'hkmap' 'hk' 'nohkmap' 'nohk'
'hkmap' 'hk'            boolean (default off)
                        global
                        {only available when compiled with the +rightleft
                        feature}
        When on, the keyboard is mapped for the Hebrew character set.
        Normally you would set 'allowrevins' and use CTRL-_ in insert mode to
        toggle this option.  See rileft.txt.
        NOTE: This option is reset when 'compatible' is set.

                                 'hkmapp' 'hkp' 'nohkmapp' 'nohkp'
'hkmapp' 'hkp'          boolean (default off)
                        global
                        {only available when compiled with the +rightleft
                        feature}
        When on, phonetic keyboard mapping is used.  'hkmap' must also be on.
        This is useful if you have a non-Hebrew keyboard.
        See rileft.txt.
        NOTE: This option is reset when 'compatible' is set.

                                 'hlsearch' 'hls' 'nohlsearch' 'nohls'
'hlsearch' 'hls'        boolean (default off)
                        global
                        {not available when compiled without the
                        +extra_search feature}
        When there is a previous search pattern, highlight all its matches.
        The type of highlighting used can be set with the 'l' occasion in the
        'highlight' option.  This uses the "Search" highlight group by
        default.  Note that only the matching text is highlighted, any offsets
        are not applied.  If the "CurSearch" highlight group is set then the
        current match is highlighted with that.
        See also: 'incsearch' and :match.
        When you get bored looking at the highlighted matches, you can turn it
        off with :nohlsearch.  This does not change the option value, as
        soon as you use a search command, the highlighting comes back.
        'redrawtime' specifies the maximum time spent on finding matches.
        When the search pattern can match an end-of-line, Vim will try to
        highlight all of the matched text.  However, this depends on where the
        search starts.  This will be the first line in the window or the first
        line below a closed fold.  A match in a previous line which is not
        drawn may not continue in a newly drawn line.
        You can specify whether the highlight status is restored on startup
        with the 'h' flag in 'viminfo' viminfo-h.
        NOTE: This option is reset when 'compatible' is set.

                                                'icon' 'noicon'
'icon'                  boolean (default off, on when title can be restored)
                        global
        When on, the icon text of the window will be set to the value of
        'iconstring' (if it is not empty), or to the name of the file
        currently being edited.  Only the last part of the name is used.
        Overridden by the 'iconstring' option.
        Only works if the terminal supports setting window icons (currently
        only X11 GUI and terminals with a non-empty 't_IS' option - these are
        Unix xterm and iris-ansi by default, where 't_IS' is taken from the
        builtin termcap).
        When Vim was compiled with HAVE_X11 defined, the original icon will be
        restored if possible X11.  See X11-icon for changing the icon on
        X11.
        For MS-Windows the icon can be changed, see windows-icon.

                                                'iconstring'
'iconstring'            string  (default "")
                        global
        When this option is not empty, it will be used for the icon text of
        the window.  This happens only when the 'icon' option is on.
        Only works if the terminal supports setting window icon text
        (currently only X11 GUI and terminals with a non-empty 't_IS' option).
        Does not work for MS-Windows.
        When Vim was compiled with HAVE_X11 defined, the original icon will be
        restored if possible X11.
        When this option contains printf-style '%' items, they will be
        expanded according to the rules used for 'statusline'.  See
        'titlestring' for example settings.
        This option cannot be set in a modeline when 'modelineexpr' is off.
        {not available when compiled without the +statusline feature}

                        'ignorecase' 'ic' 'noignorecase' 'noic'
'ignorecase' 'ic'       boolean (default off)
                        global
        Ignore case in search patterns, cmdline-completion, when
        searching in the tags file, and non-Vim9 expr-==.
        Also see 'smartcase' and 'tagcase'.
        Can be overruled by using "\c" or "\C" in the pattern, see
        /ignorecase.

                                                'imactivatefunc' 'imaf'
'imactivatefunc' 'imaf' string (default "")
                        global
        This option specifies a function that will be called to
        activate or deactivate the Input Method.  The value can be the name of
        a function, a lambda or a Funcref. See option-value-function for
        more information.
        It is not used in the MS-Windows GUI version.
        The expression will be evaluated in the sandbox when set from a
        modeline, see sandbox-option.

        Example:
                function ImActivateFunc(active)
                  if a:active
                    ... do something
                  else
                    ... do something
                  endif
                  " return value is not used
                endfunction
                set imactivatefunc=ImActivateFunc

                                                'imactivatekey' 'imak'
'imactivatekey' 'imak'  string (default "")
                        global
                        {only available when compiled with +xim and
                        +GUI_GTK}                             E599
        Specifies the key that your Input Method in X-Windows uses for
        activation.  When this is specified correctly, vim can fully control
        IM with 'imcmdline''iminsert' and 'imsearch'.
        You can't use this option to change the activation key, the option
        tells Vim what the key is.
        Format:
                [MODIFIER_FLAG-]KEY_STRING

        These characters can be used for MODIFIER_FLAG (case is ignored):
                S           Shift key
                L           Lock key
                C           Control key
                1           Mod1 key
                2           Mod2 key
                3           Mod3 key
                4           Mod4 key
                5           Mod5 key
        Combinations are allowed, for example "S-C-space" or "SC-space" are
        both shift+ctrl+space.
        See <X11/keysymdef.h> and XStringToKeysym for KEY_STRING.

        Example:
                :set imactivatekey=S-space
        "S-space" means shift+space.  This is the activation key for kinput2 +
        canna (Japanese), and ami (Korean).

                                'imcmdline' 'imc' 'noimcmdline' 'noimc'
'imcmdline' 'imc'       boolean (default off)
                        global
        When set the Input Method is always on when starting to edit a command
        line, unless entering a search pattern (see 'imsearch' for that).
        Setting this option is useful when your input method allows entering
        English characters directly, e.g., when it's used to type accented
        characters with dead keys.

                                'imdisable' 'imd' 'noimdisable' 'noimd'
'imdisable' 'imd'       boolean (default off, on for some systems (SGI))
                        global
        When set the Input Method is never used.  This is useful to disable
        the IM when it doesn't work properly.
        Currently this option is on by default for SGI/IRIX machines.  This
        may change in later releases.

                                                'iminsert' 'imi'
'iminsert' 'imi'        number (default 0)
                        local to buffer
        Specifies whether :lmap or an Input Method (IM) is to be used in
        Insert mode.  Valid values:
                0       :lmap is off and IM is off
                1       :lmap is ON and IM is off
                2       :lmap is off and IM is ON
        To always reset the option to zero when leaving Insert mode with <Esc>
        this can be used:
                :inoremap <ESC> <ESC>:set iminsert=0<CR>
        This makes :lmap and IM turn off automatically when leaving Insert
        mode.
        Note that this option changes when using CTRL-^ in Insert mode
        i_CTRL-^.
        The value is set to 1 when setting 'keymap' to a valid keymap name.
        It is also used for the argument of commands like "r" and "f".
        The value 0 may not work correctly with Motif with some XIM
        methods.  Use 'imdisable' to disable XIM then.

        You can set 'imactivatefunc' and 'imstatusfunc' to handle IME/XIM
        via external command if Vim is not compiled with the +xim,
        +multi_byte_ime or global-ime.

                                                'imsearch' 'ims'
'imsearch' 'ims'        number (default -1)
                        local to buffer
        Specifies whether :lmap or an Input Method (IM) is to be used when
        entering a search pattern.  Valid values:
                -1      the value of 'iminsert' is used, makes it look like
                        'iminsert' is also used when typing a search pattern
                0       :lmap is off and IM is off
                1       :lmap is ON and IM is off
                2       :lmap is off and IM is ON
        Note that this option changes when using CTRL-^ in Command-line mode
        c_CTRL-^.
        The value is set to 1 when it is not -1 and setting the 'keymap'
        option to a valid keymap name.
        The value 0 may not work correctly with Motif with some XIM
        methods.  Use 'imdisable' to disable XIM then.

                                                'imstatusfunc' 'imsf'
'imstatusfunc' 'imsf'   string (default "")
                        global
        This option specifies a function that is called to obtain the status
        of Input Method.  It must return a positive number when IME is active.
        The value can be the name of a function, a lambda or a Funcref.
        See option-value-function for more information.
        It is not used in the MS-Windows GUI version.

        Example:
                function ImStatusFunc()
                  let is_active = ...do something
                  return is_active ? 1 : 0
                endfunction
                set imstatusfunc=ImStatusFunc

        NOTE: This function is invoked very often.  Keep it fast.
        The expression will be evaluated in the sandbox when set from a
        modeline, see sandbox-option.

                                                'imstyle' 'imst'
'imstyle' 'imst'        number (default 1)
                        global
                        {only available when compiled with +xim and
                        +GUI_GTK}
        This option specifies the input style of Input Method:
        0   use on-the-spot style
        1   over-the-spot style
        See: xim-input-style

        For a long time on-the-spot style had been used in the GTK version of
        vim, however, it is known that it causes troubles when using mappings,
        single-repeat, etc.  Therefore over-the-spot style becomes the
        default now.  This should work fine for most people, however if you
        have any problem with it, try using on-the-spot style.
        The expression will be evaluated in the sandbox when set from a
        modeline, see sandbox-option.

                                                'include' 'inc'
'include' 'inc'         string  (default "^\s*#\s*include")
                        global or local to buffer global-local
                        {not available when compiled without the
                        +find_in_path feature}
        Pattern to be used to find an include command.  It is a search
        pattern, just like for the "/" command (See pattern).  The default
        value is for C programs.  This option is used for the commands "[i",
        "]I", "[d", etc.
        Normally the 'isfname' option is used to recognize the file name that
        comes after the matched pattern.  But if "\zs" appears in the pattern
        then the text matched from "\zs" to the end, or until "\ze" if it
        appears, is used as the file name.  Use this to include characters
        that are not in 'isfname', such as a space.  You can then use
        'includeexpr' to process the matched text.
        See option-backslash about including spaces and backslashes.

                                                'includeexpr' 'inex'
'includeexpr' 'inex'    string  (default "")
                        local to buffer
                        {not available when compiled without the
                        +find_in_path or +eval features}
        Expression to be used to transform the string found with the 'include'
        option to a file name.  Mostly useful to change "." to "/" for Java:
                :setlocal includeexpr=substitute(v:fname,'\\.','/','g')
        The "v:fname" variable will be set to the file name that was detected.
        Note the double backslash: the :set command first halves them, then
        one remains it the value, where "\." matches a dot literally.  For
        simple character replacements tr() avoids the need for escaping:
                :setlocal includeexpr=tr(v:fname,'.','/')

        Also used for the gf command if an unmodified file name can't be
        found.  Allows doing "gf" on the name after an 'include' statement.
        Also used for <cfile>.

        If the expression starts with s: or <SID>, then it is replaced with
        the script ID (local-function). Example:
                setlocal includeexpr=s:MyIncludeExpr()
                setlocal includeexpr=<SID>SomeIncludeExpr()
        Otherwise, the expression is evaluated in the context of the script
        where the option was set, thus script-local items are available.

        It is more efficient if the value is just a function call without
        arguments, see expr-option-function.

        The expression will be evaluated in the sandbox when set from a
        modeline, see sandbox-option.
        This option cannot be set in a modeline when 'modelineexpr' is off.

        It is not allowed to change text or jump to another window while
        evaluating 'includeexpr' textlock.

                                 'incsearch' 'is' 'noincsearch' 'nois'
'incsearch' 'is'        boolean (default off, set in defaults.vim if the
                                            +reltime feature is supported)
                        global
                        {not available when compiled without the
                        +extra_search features}
        While typing a search command, show where the pattern, as it was typed
        so far, matches.  The matched string is highlighted.  If the pattern
        is invalid or not found, nothing is shown.  The screen will be updated
        often, this is only useful on fast terminals.
        Also applies to the pattern in commands:
                :global
                :lvimgrep
                :lvimgrepadd
                :smagic
                :snomagic
                :sort
                :substitute
                :vglobal
                :vimgrep
                :vimgrepadd
        Note that the match will be shown, but the cursor will return to its
        original position when no match is found and when pressing <Esc>.  You
        still need to finish the search command with <Enter> to move the
        cursor to the match.
        You can use the CTRL-G and CTRL-T keys to move to the next and
        previous match. c_CTRL-G c_CTRL-T
        When compiled with the +reltime feature Vim only searches for about
        half a second.  With a complicated pattern and/or a lot of text the
        match may not be found.  This is to avoid that Vim hangs while you
        are typing the pattern.
        The highlighting can be set with the 'i' flag in 'highlight'.
        When 'hlsearch' is on, all matched strings are highlighted too while
        typing a search command. See also: 'hlsearch'.
        If you don't want to turn 'hlsearch' on, but want to highlight all
        matches while searching, you can turn on and off 'hlsearch' with
        autocmd.  Example:
                augroup vimrc-incsearch-highlight
                  autocmd!
                  autocmd CmdlineEnter /,\? :set hlsearch
                  autocmd CmdlineLeave /,\? :set nohlsearch
                augroup END

        CTRL-L can be used to add one character from after the current match
        to the command line.  If 'ignorecase' and 'smartcase' are set and the
        command line has no uppercase characters, the added character is
        converted to lowercase.
        CTRL-R CTRL-W can be used to add the word at the end of the current
        match, excluding the characters that were already typed.
        NOTE: This option is reset when 'compatible' is set.

                                                'indentexpr' 'inde'
'indentexpr' 'inde'     string  (default "")
                        local to buffer
                        {not available when compiled without the +eval
                        feature}
        Expression which is evaluated to obtain the proper indent for a line.
        It is used when a new line is created, for the = operator and
        in Insert mode as specified with the 'indentkeys' option.
        When this option is not empty, it overrules the 'cindent' and
        'smartindent' indenting.  When 'lisp' is set, this option is
        only used when 'lispoptions' contains "expr:1".
        When 'paste' is set this option is not used for indenting.
        The expression is evaluated with v:lnum set to the line number for
        which the indent is to be computed.  The cursor is also in this line
        when the expression is evaluated (but it may be moved around).

        If the expression starts with s: or <SID>, then it is replaced with
        the script ID (local-function). Example:
                set indentexpr=s:MyIndentExpr()
                set indentexpr=<SID>SomeIndentExpr()
        Otherwise, the expression is evaluated in the context of the script
        where the option was set, thus script-local items are available.

        The advantage of using a function call without arguments is that it is
        faster, see expr-option-function.

        The expression must return the number of spaces worth of indent.  It
        can return "-1" to keep the current indent (this means 'autoindent' is
        used for the indent).
        Functions useful for computing the indent are indent()cindent()
        and lispindent().
        The evaluation of the expression must not have side effects!  It must
        not change the text, jump to another window, etc.  Afterwards the
        cursor position is always restored, thus the cursor may be moved.
        Normally this option would be set to call a function:
                :set indentexpr=GetMyIndent()
        Error messages will be suppressed, unless the 'debug' option contains
        "msg".
        See indent-expression.
        NOTE: This option is set to "" when 'compatible' is set.

        The expression will be evaluated in the sandbox when set from a
        modeline, see sandbox-option.
        This option cannot be set in a modeline when 'modelineexpr' is off.

        It is not allowed to change text or jump to another window while
        evaluating 'indentexpr' textlock.

                                                'indentkeys' 'indk'
'indentkeys' 'indk'     string  (default "0{,0},0),0],:,0#,!^F,o,O,e")
                        local to buffer
        A list of keys that, when typed in Insert mode, cause reindenting of
        the current line.  Only happens if 'indentexpr' isn't empty.
        The format is identical to 'cinkeys', see indentkeys-format.
        See C-indenting and indent-expression.

                        'infercase' 'inf' 'noinfercase' 'noinf'
'infercase' 'inf'       boolean (default off)
                        local to buffer
        When doing keyword completion in insert mode ins-completion, and
        'ignorecase' is also on, the case of the match is adjusted depending
        on the typed text.  If the typed text contains a lowercase letter
        where the match has an upper case letter, the completed part is made
        lowercase.  If the typed text has no lowercase letters and the match
        has a lowercase letter where the typed text has an uppercase letter,
        and there is a letter before it, the completed part is made uppercase.
        With 'noinfercase' the match is used as-is.

                        'insertmode' 'im' 'noinsertmode' 'noim'
'insertmode' 'im'       boolean (default off)
                        global
        Makes Vim work in a way that Insert mode is the default mode.  Useful
        if you want to use Vim as a modeless editor.  Used for evim.
        These Insert mode commands will be useful:
        - Use the cursor keys to move around.
        - Use CTRL-O to execute one Normal mode command i_CTRL-O.  When
          this is a mapping, it is executed as if 'insertmode' was off.
          Normal mode remains active until the mapping is finished.
        - Use CTRL-L to execute a number of Normal mode commands, then use
          <Esc> to get back to Insert mode.  Note that CTRL-L moves the cursor
          left, like <Esc> does when 'insertmode' isn't set.  i_CTRL-L

        These items change when 'insertmode' is set:
        - when starting to edit of a file, Vim goes to Insert mode.
        - <Esc> in Insert mode is a no-op and beeps.
        - <Esc> in Normal mode makes Vim go to Insert mode.
        - CTRL-L in Insert mode is a command, it is not inserted.
        - CTRL-Z in Insert mode suspends Vim, see CTRL-Z.     i_CTRL-Z
        However, when <Esc> is used inside a mapping, it behaves like
        'insertmode' was not set.  This was done to be able to use the same
        mappings with 'insertmode' set or not set.
        When executing commands with :normal 'insertmode' is not used.

        NOTE: This option is reset when 'compatible' is set.

                                                'isfname' 'isf'
'isfname' 'isf'         string  (default for Win32:
                             "@,48-57,/,\,.,-,_,+,,,#,$,%,{,},[,],:,@-@,!,~,="
                            for AMIGA: "@,48-57,/,.,-,_,+,,,$,:"
                            for VMS: "@,48-57,/,.,-,_,+,,,#,$,%,<,>,[,],:,;,~"
                            for OS/390: "@,240-249,/,.,-,_,+,,,#,$,%,~,="
                            otherwise: "@,48-57,/,.,-,_,+,,,#,$,%,~,=")
                        global
        The characters specified by this option are included in file names and
        path names.  Filenames are used for commands like "gf", "[i" and in
        the tags file.  It is also used for "\f" in a pattern.
        Multi-byte characters 256 and above are always included, only the
        characters up to 255 are specified with this option.
        For UTF-8 the characters 0xa0 to 0xff are included as well.
        Think twice before adding white space to this option.  Although a
        space may appear inside a file name, the effect will be that Vim
        doesn't know where a file name starts or ends when doing completion.
        It most likely works better without a space in 'isfname'.

        Note that on systems using a backslash as path separator, Vim tries to
        do its best to make it work as you would expect.  That is a bit
        tricky, since Vi originally used the backslash to escape special
        characters.  Vim will not remove a backslash in front of a normal file
        name character on these systems, but it will on Unix and alikes.  The
        '&' and '^' are not included by default, because these are special for
        cmd.exe.

        The format of this option is a list of parts, separated with commas.
        Each part can be a single character number or a range.  A range is two
        character numbers with '-' in between.  A character number can be a
        decimal number between 0 and 255 or the ASCII character itself (does
        not work for digits).  Example:
                "_,-,128-140,#-43"      (include '_' and '-' and the range
                                        128 to 140 and '#' to 43)
        If a part starts with '^', the following character number or range
        will be excluded from the option.  The option is interpreted from left
        to right.  Put the excluded character after the range where it is
        included.  To include '^' itself use it as the last character of the
        option or the end of a range.  Example:
                "^a-z,#,^"      (exclude 'a' to 'z', include '#' and '^')
        If the character is '@', all characters where isalpha() returns TRUE
        are included.  Normally these are the characters a to z and A to Z,
        plus accented characters.  To include '@' itself use "@-@".  Examples:
                "@,^a-z"        All alphabetic characters, excluding lower
                                case ASCII letters.
                "a-z,A-Z,@-@"   All letters plus the '@' character.
        A comma can be included by using it where a character number is
        expected.  Example:
                "48-57,,,_"     Digits, comma and underscore.
        A comma can be excluded by prepending a '^'.  Example:
                " -~,^,,9"      All characters from space to '~', excluding
                                comma, plus <Tab>.
        See option-backslash about including spaces and backslashes.

                                                'isident' 'isi'
'isident' 'isi'         string  (default for Win32:
                                           "@,48-57,_,128-167,224-235"
                                otherwise: "@,48-57,_,192-255")
                        global
        The characters given by this option are included in identifiers.
        Identifiers are used in recognizing environment variables and after a
        match of the 'define' option.  It is also used for "\i" in a
        pattern.  See 'isfname' for a description of the format of this
        option.  For '@' only characters up to 255 are used.
        Careful: If you change this option, it might break expanding
        environment variables.  E.g., when '/' is included and Vim tries to
        expand "$HOME/.viminfo".  Maybe you should change 'iskeyword' instead.

                                                'iskeyword' 'isk'
'iskeyword' 'isk'       string (Vim default for Win32:
                                            "@,48-57,_,128-167,224-235"
                                   otherwise:  "@,48-57,_,192-255"
                                Vi default: "@,48-57,_")
                        local to buffer
        Keywords are used in searching and recognizing with many commands:
        "w", "*", "[i", etc.  It is also used for "\k" in a pattern.  See
        'isfname' for a description of the format of this option.  For '@'
        characters above 255 check the "word" character class (any character
        that is not white space or punctuation).
        For C programs you could use "a-z,A-Z,48-57,_,.,-,>".
        For a help file it is set to all non-blank printable characters except
        '*', '"' and '|' (so that CTRL-] on a command finds the help for that
        command).
        When the 'lisp' option is on the '-' character is always included.
        This option also influences syntax highlighting, unless the syntax
        uses :syn-iskeyword.
        NOTE: This option is set to the Vi default value when 'compatible' is
        set and to the Vim default value when 'compatible' is reset.

                                                'isprint' 'isp'
'isprint' 'isp' string  (default for Win32 and VMS:
                                "@,~-255"; otherwise: "@,161-255")
                        global
        The characters given by this option are displayed directly on the
        screen.  It is also used for "\p" in a pattern.  The characters from
        space (ASCII 32) to '~' (ASCII 126) are always displayed directly,
        even when they are not included in 'isprint' or excluded.  See
        'isfname' for a description of the format of this option.

        Non-printable characters are displayed with two characters:
                  0 -  31       "^@" - "^_"
                 32 - 126       always single characters
                   127          "^?"
                128 - 159       "~@" - "~_"
                160 - 254       "| " - "|~"
                   255          "~?"
        When 'encoding' is a Unicode one, illegal bytes from 128 to 255 are
        displayed as <xx>, with the hexadecimal value of the byte.
        When 'display' contains "uhex" all unprintable characters are
        displayed as <xx>.
        The SpecialKey highlighting will be used for unprintable characters.
        hl-SpecialKey

        Multi-byte characters 256 and above are always included, only the
        characters up to 255 are specified with this option.  When a character
        is printable but it is not available in the current font, a
        replacement character will be shown.
        Unprintable and zero-width Unicode characters are displayed as <xxxx>.
        There is no option to specify these characters.

                        'joinspaces' 'js' 'nojoinspaces' 'nojs'
'joinspaces' 'js'       boolean (default on)
                        global
        Insert two spaces after a '.', '?' and '!' with a join command.
        When 'cpoptions' includes the 'j' flag, only do this after a '.'.
        Otherwise only one space is inserted.
        NOTE: This option is set when 'compatible' is set.

                                                'jumpoptions' 'jop'
'jumpoptions' 'jop'     string  (default "")
                        global
        List of words that change the behavior of the jumplist.
          stack         Make the jumplist behave like the tagstack.
                        Relative location of entries in the jumplist is
                        preserved at the cost of discarding subsequent entries
                        when navigating backwards in the jumplist and then
                        jumping to a location.  jumplist-stack

                                                        'key'
'key'                   string  (default "")
                        local to buffer
                        {only available when compiled with the +cryptv
                        feature}
        The key that is used for encrypting and decrypting the current buffer.
        See encryption and 'cryptmethod'.
        Careful: Do not set the key value by hand, someone might see the typed
        key.  Use the :X command.  But you can make 'key' empty:
                :set key=
        It is not possible to get the value of this option with ":set key" or
        "echo &key".  This is to avoid showing it to someone who shouldn't
        know.  It also means you cannot see it yourself once you have set it,
        be careful not to make a typing error!
        You also cannot use :set-=:set+=:set^= on this option to
        prevent an attacker from guessing substrings in your key.
        You can use "&key" in an expression to detect whether encryption is
        enabled.  When 'key' is set it returns "*****" (five stars).

                                        'keymap' 'kmp' E544
'keymap' 'kmp'          string  (default "")
                        local to buffer
                        {only available when compiled with the +keymap
                        feature}
        Name of a keyboard mapping.  See mbyte-keymap.
        Setting this option to a valid keymap name has the side effect of
        setting 'iminsert' to one, so that the keymap becomes effective.
        'imsearch' is also set to one, unless it was -1
        Only alphanumeric characters, '.', '-' and '_' can be used.

                                        'keymodel' 'km'
'keymodel' 'km'         string  (default "")
                        global
        List of comma-separated words, which enable special things that keys
        can do.  These values can be used:
           startsel     Using a shifted special key starts selection (either
                        Select mode or Visual mode, depending on "key" being
                        present in 'selectmode').
           stopsel      Using a not-shifted special key stops selection.
        Special keys in this context are the cursor keys, <End><Home>,
        <PageUp> and <PageDown>.
        The 'keymodel' option is set by the :behave command.

                                                'keyprotocol' 'kpc'
'keyprotocol' 'kpc'     string  (default: see below)
                        global
        Specifies what keyboard protocol to use depending on the value of
        'term'.  The supported keyboard protocols names are:
                none    whatever the terminal uses
                mok2    modifyOtherKeys level 2, as supported by xterm
                kitty   Kitty keyboard protocol, as supported by Kitty

        The option value is a list of comma separated items.  Each item has
        a pattern that is matched against the 'term' option, a colon and the
        protocol name to be used.  To illustrate this, the default value would
        be set with:
           set keyprotocol=kitty:kitty,foot:kitty,wezterm:kitty,xterm:mok2

        This means that when 'term' contains "kitty, "foot" or "wezterm"
        somewhere then the "kitty" protocol is used.  When 'term' contains
        "xterm" somewhere, then the "mok2" protocol is used.

        The first match is used, thus if you want to have "kitty" use the
        kitty protocol, but "badkitty" not, then you should match "badkitty"
        first and use the "none" value:
           set keyprotocol=badkitty:none,kitty:kitty

        The option is used after 'term' has been changed.  First the termcap
        entries are set, possibly using the builtin list, see builtin-terms.
        Then this option is inspected and if there is a match and a protocol
        is specified the following happens:
                none    Nothing, the regular t_TE and t_TI values remain

                mok2    The t_TE value is changed to:
                            CSI >4;m    disables modifyOtherKeys
                        The t_TI value is changed to:
                            CSI >4;2m   enables modifyOtherKeys
                            CSI ?4m     request the modifyOtherKeys state

                kitty   The t_TE value is changed to:
                            CSI >4;m    disables modifyOtherKeys
                            CSI =0;1u   disables the kitty keyboard protocol
                        The t_TI value is changed to:
                            CSI =1;1u   enables the kitty keyboard protocol
                            CSI ?u      request kitty keyboard protocol state
                            CSI >c      request the termresponse

        If you notice problems, such as characters being displayed that
        disappear after CTRL-L, you might want to try making this option
        empty.  Then set the 'term' option to have it take effect:
                set keyprotocol=
                let &term = &term


                                        'keywordprg' 'kp'
'keywordprg' 'kp'       string  (default "man" or "man -s",  DOS: ":help",
                                                                  VMS: "help")
                        global or local to buffer global-local
        Program to use for the K command.  Environment variables are
        expanded :set_env.  ":help" may be used to access the Vim internal
        help.  (Note that previously setting the global option to the empty
        value did this, which is now deprecated.)
        When the first character is ":", the command is invoked as a Vim
        Ex command with [count] added as an argument if it is not zero.
        When "man", "man -s" or an Ex command is used, Vim will automatically
        translate a count for the "K" command and pass it as the first
        argument.  For "man -s" the "-s" is removed when there is no count.
        See option-backslash about including spaces and backslashes.
        Example:
                :set keywordprg=man\ -s
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                        'langmap' 'lmap' E357 E358
'langmap' 'lmap'        string  (default "")
                        global
                        {only available when compiled with the +langmap
                        feature}
        This option allows switching your keyboard into a special language
        mode.  When you are typing text in Insert mode the characters are
        inserted directly.  When in Normal mode the 'langmap' option takes
        care of translating these special characters to the original meaning
        of the key.  This means you don't have to change the keyboard mode to
        be able to execute Normal mode commands.
        This is the opposite of the 'keymap' option, where characters are
        mapped in Insert mode.
        Also consider setting 'langremap' to off, to prevent 'langmap' from
        applying to characters resulting from a mapping.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

        Example (for Greek, in UTF-8):                          greek 
            :set langmap=ΑA,ΒB,ΨC,ΔD,ΕE,ΦF,ΓG,ΗH,ΙI,ΞJ,ΚK,ΛL,ΜM,ΝN,ΟO,ΠP,QQ,ΡR,ΣS,ΤT,ΘU,ΩV,WW,ΧX,ΥY,ΖZ,αa,βb,ψc,δd,εe,φf,γg,ηh,ιi,ξj,κk,λl,μm,νn,οo,πp,qq,ρr,σs,τt,θu,ωv,ςw,χx,υy,ζz
        Example (exchanges meaning of z and y for commands):
            :set langmap=zy,yz,ZY,YZ

        The 'langmap' option is a list of parts, separated with commas.  Each
        part can be in one of two forms:
        1.  A list of pairs.  Each pair is a "from" character immediately
            followed by the "to" character.  Examples: "aA", "aAbBcC".
        2.  A list of "from" characters, a semicolon and a list of "to"
            characters.  Example: "abc;ABC"
        Example: "aA,fgh;FGH,cCdDeE"
        Special characters need to be preceded with a backslash.  These are
        ";", ',', '"', '|' and backslash itself.

        This will allow you to activate vim actions without having to switch
        back and forth between the languages.  Your language characters will
        be understood as normal vim English characters (according to the
        langmap mappings) in the following cases:
         o Normal/Visual mode (commands, buffer/register names, user mappings)
         o Insert/Replace Mode: Register names after CTRL-R
         o Insert/Replace Mode: Mappings
        Characters entered in Command-line mode will NOT be affected by
        this option.   Note that this option can be changed at any time
        allowing to switch between mappings for different languages/encodings.
        Use a mapping to avoid having to type it each time!

                                        'langmenu' 'lm'
'langmenu' 'lm'         string  (default "")
                        global
                        {only available when compiled with the +menu and
                        +multi_lang features}
        Language to use for menu translation.  Tells which file is loaded
        from the "lang" directory in 'runtimepath':
                "lang/menu_" .. &langmenu .. ".vim"
        (without the spaces).  For example, to always use the Dutch menus, no
        matter what $LANG is set to:
                :set langmenu=nl_NL.ISO_8859-1
        When 'langmenu' is empty, v:lang is used.
        Only normal file name characters can be used, "/\*?[|<>" are illegal.
        If your $LANG is set to a non-English language but you do want to use
        the English menus:
                :set langmenu=none
        This option must be set before loading menus, switching on filetype
        detection or syntax highlighting.  Once the menus are defined setting
        this option has no effect.  But you could do this:
                :source $VIMRUNTIME/delmenu.vim
                :set langmenu=de_DE.ISO_8859-1
                :source $VIMRUNTIME/menu.vim
        Warning: This deletes all menus that you defined yourself!

                        'langnoremap' 'lnr' 'nolangnoremap' 'nolnr'
'langnoremap' 'lnr'     boolean (default off, set in defaults.vim)
                        global
                        {only available when compiled with the +langmap
                        feature}
        This is just like 'langremap' but with the value inverted.  It only
        exists for backwards compatibility.  When setting 'langremap' then
        'langnoremap' is set to the inverted value, and the other way around.

                        'langremap' 'lrm' 'nolangremap' 'nolrm'
'langremap' 'lrm'       boolean (default on, set to off in defaults.vim)
                        global
                        {only available when compiled with the +langmap
                        feature}
        When off, setting 'langmap' does not apply to characters resulting from
        a mapping.  This basically means, if you noticed that setting
        'langmap' disables some of your mappings, try resetting this option.
        This option defaults to on for backwards compatibility.  Set it off if
        that works for you to avoid mappings to break.

                                        'laststatus' 'ls'
'laststatus' 'ls'       number  (default 1)
                        global
        The value of this option influences when the last window will have a
        status line:
                0: never
                1: only if there are at least two windows
                2: always
        The screen looks nicer with a status line if you have several
        windows, but it takes another screen line. status-line

                        'lazyredraw' 'lz' 'nolazyredraw' 'nolz'
'lazyredraw' 'lz'       boolean (default off)
                        global
        When this option is set, the screen will not be redrawn while
        executing macros, registers and other commands that have not been
        typed.  Also, updating the window title is postponed.  To force an
        update use :redraw.
        This may occasionally cause display errors.  It is only meant to be set
        temporarily when performing an operation where redrawing may cause
        flickering or cause a slowdown.

                        'linebreak' 'lbr' 'nolinebreak' 'nolbr'
'linebreak' 'lbr'       boolean (default off)
                        local to window
                        {not available when compiled without the +linebreak
                        feature}
        If on, Vim will wrap long lines at a character in 'breakat' rather
        than at the last character that fits on the screen.  Unlike
        'wrapmargin' and 'textwidth', this does not insert <EOL>s in the file,
        it only affects the way the file is displayed, not its contents.
        If 'breakindent' is set, line is visually indented. Then, the value
        of 'showbreak' is used to put in front of wrapped lines. This option
        is not used when the 'wrap' option is off.
        Note that <Tab> characters after an <EOL> are mostly not displayed
        with the right amount of white space.

                                                'lines' E593
'lines'                 number  (default 24 or terminal height)
                        global
        Number of lines of the Vim window.
        Normally you don't need to set this.  It is done automatically by the
        terminal initialization code.  Also see posix-screen-size.
        When Vim is running in the GUI or in a resizable window, setting this
        option will cause the window size to be changed.  When you only want
        to use the size for the GUI, put the command in your gvimrc file.
        Vim limits the number of lines to what fits on the screen.  You can
        use this command to get the tallest window possible:
                :set lines=999
        Minimum value is 2, maximum value is 1000.
        If you get fewer lines than expected, check the 'guiheadroom' option.
        When you set this option and Vim is unable to change the physical
        number of lines of the display, the display may be messed up.

                                                'linespace' 'lsp'
'linespace' 'lsp'       number  (default 0, 1 for Win32 GUI)
                        global
                        {only in the GUI}
        Number of pixel lines inserted between characters.  Useful if the font
        uses the full character cell height, making lines touch each other.
        When non-zero there is room for underlining.
        With some fonts there can be too much room between lines (to have
        space for ascents and descents).  Then it makes sense to set
        'linespace' to a negative value.  This may cause display problems
        though!

                                                'lisp' 'nolisp'
'lisp'                  boolean (default off)
                        local to buffer
        Lisp mode: When <Enter> is typed in insert mode set the indent for
        the next line to Lisp standards (well, sort of).  Also happens with
        "cc" or "S".  'autoindent' must also be on for this to work.  The 'p'
        flag in 'cpoptions' changes the method of indenting: Vi compatible or
        better.  Also see 'lispwords'.
        The '-' character is included in keyword characters.  Redefines the
        "=" operator to use this same indentation algorithm rather than
        calling an external program if 'equalprg' is empty.
        This option is not used when 'paste' is set.

                                                'lispoptions' 'lop'
'lispoptions' 'lop'     string  (default "")
                        local to buffer
        Comma-separated list of items that influence the Lisp indenting when
        enabled with the 'lisp' option.  Currently only one item is
        supported:
                expr:1  use 'indentexpr' for Lisp indenting when it is set
                expr:0  do not use 'indentexpr' for Lisp indenting (default)
        Note that when using 'indentexpr' the = operator indents all the
        lines, otherwise the first line is not indented (Vi-compatible).

                                                'lispwords' 'lw'
'lispwords' 'lw'        string  (default is very long)
                        global or local to buffer global-local
        Comma-separated list of words that influence the Lisp indenting when
        enabled with the 'lisp' option.

                                                'list' 'nolist'
'list'                  boolean (default off)
                        local to window
        List mode: By default show tabs as CTRL-I is displayed, display $
        after end of line.  Useful to see the difference between tabs and
        spaces and for trailing blanks.  Further changed by the 'listchars'
        option.

        The cursor is displayed at the start of the space a Tab character
        occupies, not at the end as usual in Normal mode.  To get this cursor
        position while displaying Tabs with spaces, use:
                :set list lcs=tab:\ \ 

        Note that list mode will also affect formatting (set with 'textwidth'
        or 'wrapmargin') when 'cpoptions' includes 'L'.  See 'listchars' for
        changing the way tabs are displayed.

                                                'listchars' 'lcs'
'listchars' 'lcs'       string  (default "eol:$")
                        global or local to window global-local
        Strings to use in 'list' mode and for the :list command.  It is a
        comma-separated list of string settings. E1511
                                                        lcs-eol
          eol:c         Character to show at the end of each line.  When
                        omitted, there is no extra character at the end of the
                        line.
                                                        lcs-tab
          tab:xy[z]     Two or three characters to be used to show a tab.
                        The third character is optional.

          tab:xy        The 'x' is always used, then 'y' as many times as will
                        fit.  Thus "tab:>-" displays:
                                >
                                >-
                                >--
                                etc.

          tab:xyz       The 'z' is always used, then 'x' is prepended, and
                        then 'y' is used as many times as will fit.  Thus
                        "tab:<->" displays:
                                >
                                <>
                                <->
                                <-->
                                etc.

                        When "tab:" is omitted, a tab is shown as ^I.
                                                        lcs-space
          space:c       Character to show for a space.  When omitted, spaces
                        are left blank.
                                                        lcs-multispace
          multispace:c...
                        One or more characters to use cyclically to show for
                        multiple consecutive spaces.  Overrides the "space"
                        setting, except for single spaces.  When omitted, the
                        "space" setting is used.  For example,
                        :set listchars=multispace:---+ shows ten consecutive
                        spaces as:
                                ---+---+--
                                                        lcs-lead
          lead:c        Character to show for leading spaces.  When omitted,
                        leading spaces are blank.  Overrides the "space" and
                        "multispace" settings for leading spaces.  You can
                        combine it with "tab:", for example:
                                :set listchars+=tab:>-,lead:.
                                                        lcs-leadmultispace
          leadmultispace:c...
                        Like the lcs-multispace value, but for leading
                        spaces only.  Also overrides lcs-lead for leading
                        multiple spaces.
                        :set listchars=leadmultispace:---+ shows ten
                        consecutive leading spaces as:
                                ---+---+--XXX
                        Where "XXX" denotes the first non-blank characters in
                        the line.
                                                        lcs-trail
          trail:c       Character to show for trailing spaces.  When omitted,
                        trailing spaces are blank.  Overrides the "space" and
                        "multispace" settings for trailing spaces.
                                                        lcs-extends
          extends:c     Character to show in the last column, when 'wrap' is
                        off and the line continues beyond the right of the
                        screen.
                                                        lcs-precedes
          precedes:c    Character to show in the first visible column of the
                        physical line, when there is text preceding the
                        character visible in the first column.
                                                        lcs-conceal
          conceal:c     Character to show in place of concealed text, when
                        'conceallevel' is set to 1.
                                                        lcs-nbsp
          nbsp:c        Character to show for a non-breakable space character
                        (0xA0 (160 decimal) and U+202F).  Left blank when
                        omitted.

        The characters ':' and ',' should not be used.  UTF-8 characters can
        be used when 'encoding' is "utf-8", otherwise only printable
        characters are allowed.  All characters must be single width. E1512

        Each character can be specified as hex:
                set listchars=eol:\\x24
                set listchars=eol:\\u21b5
                set listchars=eol:\\U000021b5
        Note that a double backslash is used.  The number of hex characters
        must be exactly 2 for \\x, 4 for \\u and 8 for \\U.

        Examples:
            :set lcs=tab:>-,trail:-
            :set lcs=tab:>-,eol:<,nbsp:%
            :set lcs=extends:>,precedes:<
        The "NonText" highlighting will be used for "eol", "extends" and
        "precedes".  "SpecialKey" will be used for "tab", "nbsp", "space",
        "multispace", "lead" and "trail".
        hl-NonText hl-SpecialKey

                        'lpl' 'nolpl' 'loadplugins' 'noloadplugins'
'loadplugins' 'lpl'     boolean (default on)
                        global
        When on the plugin scripts are loaded when starting up load-plugins.
        This option can be reset in your vimrc file to disable the loading
        of plugins.
        Note that using the "-u NONE", "-u DEFAULTS" and "--noplugin" command
        line arguments reset this option.  See -u and --noplugin.

                                                'luadll'
'luadll'                string  (default depends on the build)
                        global
                        {only available when compiled with the +lua/dyn
                        feature}
        Specifies the name of the Lua shared library. The default is
        DYNAMIC_LUA_DLL, which was specified at compile time.
        Environment variables are expanded :set_env.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                                'macatsui' 'nomacatsui'
'macatsui'              boolean (default on)
                        global
                        {not supported}
        No longer supported, as the Mac OS X GUI code was removed.

                                                'magic' 'nomagic'
'magic'                 boolean (default on)
                        global
        Changes the special characters that can be used in search patterns.
        See pattern.
        WARNING: Switching this option off most likely breaks plugins!  That
        is because many patterns assume it's on and will fail when it's off.
        Only switch it off when working with old Vi scripts.  In any other
        situation write patterns that work when 'magic' is on.  Include "\M"
        when you want to /\M.
        In Vim9 script the value of 'magic' is ignored, patterns behave like
        it is always set.

                                                'makeef' 'mef'
'makeef' 'mef'          string  (default: "")
                        global
                        {not available when compiled without the +quickfix
                        feature}
        Name of the errorfile for the :make command (see :make_makeprg)
        and the :grep command.
        When it is empty, an internally generated temp file will be used.
        When "##" is included, it is replaced by a number to make the name
        unique.  This makes sure that the ":make" command doesn't overwrite an
        existing file.
        NOT used for the ":cf" command.  See 'errorfile' for that.
        Environment variables are expanded :set_env.
        See option-backslash about including spaces and backslashes.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                        'makeencoding' 'menc'
'makeencoding' 'menc'   string  (default "")
                        global or local to buffer global-local
        Encoding used for reading the output of external commands.  When empty,
        encoding is not converted.
        This is used for :make:lmake:grep:lgrep:grepadd,
        :lgrepadd:cfile:cgetfile:caddfile:lfile:lgetfile,
        and :laddfile.

        This would be mostly useful when you use MS-Windows and set 'encoding'
        to "utf-8".  If +iconv is enabled and GNU libiconv is used, setting
        'makeencoding' to "char" has the same effect as setting to the system
        locale encoding.  Example:
                :set encoding=utf-8
                :set makeencoding=char  " system locale is used

                                                'makeprg' 'mp'
'makeprg' 'mp'          string  (default "make", VMS: "MMS")
                        global or local to buffer global-local
        Program to use for the ":make" command.  See :make_makeprg.
        This option may contain '%' and '#' characters (see  :_% and :_#),
        which are expanded to the current and alternate file name.  Use ::S
        to escape file names in case they contain special characters.
        Environment variables are expanded :set_env.  See option-backslash
        about including spaces and backslashes.
        Note that a '|' must be escaped twice: once for ":set" and once for
        the interpretation of a command.  When you use a filter called
        "myfilter" do it like this:
            :set makeprg=gmake\ \\\|\ myfilter
        The placeholder "$*" can be given (even multiple times) to specify
        where the arguments will be included, for example:
            :set makeprg=latex\ \\\\nonstopmode\ \\\\input\\{$*}
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                                'matchpairs' 'mps'
'matchpairs' 'mps'      string  (default "(:),{:},[:]")
                        local to buffer
        Characters that form pairs.  The % command jumps from one to the
        other.
        Only character pairs are allowed that are different, thus you cannot
        jump between two double quotes.
        The characters must be separated by a colon.
        The pairs must be separated by a comma.  Example for including '<' and
        '>' (for HTML):
                :set mps+=<:>

        A more exotic example, to jump between the '=' and ';' in an
        assignment, useful for languages like C and Java:
                :au FileType c,cpp,java set mps+==:;

        For a more advanced way of using "%", see the matchit.vim plugin in
        the $VIMRUNTIME/pack/dist/opt/matchit directory. add-local-help

                                                'matchtime' 'mat'
'matchtime' 'mat'       number  (default 5)
                        global
        Tenths of a second to show the matching paren, when 'showmatch' is
        set.  Note that this is not in milliseconds, like other options that
        set a time.  This is to be compatible with Nvi.

                                                'maxcombine' 'mco'
'maxcombine' 'mco'      number (default 2)
                        global
        The maximum number of combining characters supported for displaying.
        Only used when 'encoding' is "utf-8".
        The default is OK for most languages.  Hebrew may require 4.
        Maximum value is 6.
        Even when this option is set to 2 you can still edit text with more
        combining characters, you just can't see them.  Use g8 or ga.
        See mbyte-combining.

                                                'maxfuncdepth' 'mfd'
'maxfuncdepth' 'mfd'    number  (default 100)
                        global
                        {not available when compiled without the +eval
                        feature}
        Maximum depth of function calls for user functions.  This normally
        catches endless recursion.  When using a recursive function with
        more depth, set 'maxfuncdepth' to a bigger number.  But this will use
        more memory, there is the danger of failing when memory is exhausted.
        Increasing this limit above 200 also changes the maximum for Ex
        command recursion, see E169.
        See also :function.
        Also used for maximum depth of callback functions.

                                                'maxmapdepth' 'mmd' E223
'maxmapdepth' 'mmd'     number  (default 1000)
                        global
        Maximum number of times a mapping is done without resulting in a
        character to be used.  This normally catches endless mappings, like
        ":map x y" with ":map y x".  It still does not catch ":map g wg",
        because the 'w' is used before the next mapping is done.  See also
        key-mapping.

                                                'maxmem' 'mm'
'maxmem' 'mm'           number  (default between 256 to 5120 (system
                                 dependent) or half the amount of memory
                                 available)
                        global
        Maximum amount of memory (in Kbyte) to use for one buffer.  When this
        limit is reached allocating extra memory for a buffer will cause
        other memory to be freed.
        The maximum usable value is about 2000000.  Use this to work without a
        limit.
        The value is ignored when 'swapfile' is off.
        Also see 'maxmemtot'.

                                                'maxmempattern' 'mmp'
'maxmempattern' 'mmp'   number  (default 1000)
                        global
        Maximum amount of memory (in Kbyte) to use for pattern matching.
        The maximum value is about 2000000.  Use this to work without a limit.
                                                        E363
        When Vim runs into the limit it gives an error message and mostly
        behaves like CTRL-C was typed.
        Running into the limit often means that the pattern is very
        inefficient or too complex.  This may already happen with the pattern
        "\(.\)*" on a very long line.  ".*" works much better.
        Might also happen on redraw, when syntax rules try to match a complex
        text structure.
        Vim may run out of memory before hitting the 'maxmempattern' limit, in
        which case you get an "Out of memory" error instead.

                                                'maxmemtot' 'mmt'
'maxmemtot' 'mmt'       number  (default between 2048 and 10240 (system
                                 dependent) or half the amount of memory
                                 available)
                        global
        Maximum amount of memory in Kbyte to use for all buffers together.
        The maximum usable value is about 2000000 (2 Gbyte).  Use this to work
        without a limit.
        On 64 bit machines higher values might work.  But hey, do you really
        need more than 2 Gbyte for text editing?  Keep in mind that text is
        stored in the swap file, one can edit files > 2 Gbyte anyway.  We do
        need the memory to store undo info.
        Buffers with 'swapfile' off still count to the total amount of memory
        used.
        Also see 'maxmem'.

                                                'menuitems' 'mis'
'menuitems' 'mis'       number  (default 25)
                        global
                        {not available when compiled without the +menu
                        feature}
        Maximum number of items to use in a menu.  Used for menus that are
        generated from a list of items, e.g., the Buffers menu.  Changing this
        option has no direct effect, the menu must be refreshed first.

                                                'mkspellmem' 'msm'
'mkspellmem' 'msm'      string  (default "460000,2000,500")
                        global
                        {not available when compiled without the +syntax
                        feature}
        Parameters for :mkspell.  This tunes when to start compressing the
        word tree.  Compression can be slow when there are many words, but
        it's needed to avoid running out of memory.  The amount of memory used
        per word depends very much on how similar the words are, that's why
        this tuning is complicated.

        There are three numbers, separated by commas:
                {start},{inc},{added}

        For most languages the uncompressed word tree fits in memory.  {start}
        gives the amount of memory in Kbyte that can be used before any
        compression is done.  It should be a bit smaller than the amount of
        memory that is available to Vim.

        When going over the {start} limit the {inc} number specifies the
        amount of memory in Kbyte that can be allocated before another
        compression is done.  A low number means compression is done after
        less words are added, which is slow.  A high number means more memory
        will be allocated.

        After doing compression, {added} times 1024 words can be added before
        the {inc} limit is ignored and compression is done when any extra
        amount of memory is needed.  A low number means there is a smaller
        chance of hitting the {inc} limit, less memory is used but it's
        slower.

        The languages for which these numbers are important are Italian and
        Hungarian.  The default works for when you have about 512 Mbyte.  If
        you have 1 Gbyte you could use:
                :set mkspellmem=900000,3000,800
        If you have less than 512 Mbyte :mkspell may fail for some
        languages, no matter what you set 'mkspellmem' to.

        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                   'modeline' 'ml' 'nomodeline' 'noml'
'modeline' 'ml'         boolean (Vim default: on (off for root),
                                 Vi default: off)
                        local to buffer
        If 'modeline' is on 'modelines' gives the number of lines that is
        checked for set commands.  If 'modeline' is off or 'modelines' is zero
        no lines are checked.  See modeline.

                           'modelineexpr' 'mle' 'nomodelineexpr' 'nomle'
'modelineexpr' 'mle'    boolean (default: off)
                        global
        When on allow some options that are an expression to be set in the
        modeline.  Check the option for whether it is affected by
        'modelineexpr'.  Also see modeline.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                                'modelines' 'mls'
'modelines' 'mls'       number  (default 5)
                        global
        If 'modeline' is on 'modelines' gives the number of lines that is
        checked for set commands.  If 'modeline' is off or 'modelines' is zero
        no lines are checked.  See modeline.
        NOTE'modeline' is set to the Vi default value when 'compatible' is
        set and to the Vim default value when 'compatible' is reset.

                                'modifiable' 'ma' 'nomodifiable' 'noma'
                                E21
'modifiable' 'ma'       boolean (default on)
                        local to buffer
        When off the buffer contents cannot be changed.  The 'fileformat' and
        'fileencoding' options also can't be changed.
        Can be reset on startup with the -M command line argument.

                                'modified' 'mod' 'nomodified' 'nomod'
'modified' 'mod'        boolean (default off)
                        local to buffer  local-noglobal
        When on, the buffer is considered to be modified.  This option is set
        when:
        1. A change was made to the text since it was last written.  Using the
           undo command to go back to the original text will reset the
           option.  But undoing changes that were made before writing the
           buffer will set the option again, since the text is different from
           when it was written.
        2. 'fileformat' or 'fileencoding' is different from its original
           value.  The original value is set when the buffer is read or
           written.  A ":set nomodified" command also resets the original
           values to the current values and the 'modified' option will be
           reset.
           Similarly for 'eol' and 'bomb'.
        This option is not set when a change is made to the buffer as the
        result of a BufNewFile, BufRead/BufReadPost, BufWritePost,
        FileAppendPost or VimLeave autocommand event.  See gzip-example for
        an explanation.
        When 'buftype' is "nowrite" or "nofile" this option may be set, but
        will be ignored.
        Note that the text may actually be the same, e.g. 'modified' is set
        when using "rA" on an "A".

                                                'more' 'nomore'
'more'                  boolean (Vim default: on, Vi default: off)
                        global
        When on, listings pause when the whole screen is filled.  You will get
        the more-prompt.  When this option is off there are no pauses, the
        listing continues until finished.
        NOTE: This option is set to the Vi default value when 'compatible' is
        set and to the Vim default value when 'compatible' is reset.

                                                'mouse'
'mouse'                 string  (default "", "a" for GUI and Win32,
                                        set to "a" or "nvi" in defaults.vim)
                        global
        Enable the use of the mouse.  Works for most terminals (xterm, Win32
        win32-mouse, QNX pterm, *BSD console with sysmouse and Linux console
        with gpm).  For using the mouse in the GUI, see gui-mouse.  The
        mouse can be enabled for different modes:
                n       Normal mode and Terminal modes
                v       Visual mode
                i       Insert mode
                c       Command-line mode
                h       all previous modes when editing a help file
                a       all previous modes
                r       for hit-enter and more-prompt prompt
        Normally you would enable the mouse in all five modes with:
                :set mouse=a
        If your terminal can't overrule the mouse events going to the
        application, use:
                :set mouse=nvi
        Then you can press ":", select text for the system, and press Esc to go
        back to Vim using the mouse events.
        In defaults.vim "nvi" is used if the 'term' option is not matching
        "xterm".

        When the mouse is not enabled, the GUI will still use the mouse for
        modeless selection.  This doesn't move the text cursor.

        See mouse-using.  Also see 'clipboard'.

        Note: When enabling the mouse in a terminal, copy/paste will use the
        "* register if there is access to an X-server.  The xterm handling of
        the mouse buttons can still be used by keeping the shift key pressed.
        Also see the 'clipboard' option.

                        'mousefocus' 'mousef' 'nomousefocus' 'nomousef'
'mousefocus' 'mousef'   boolean (default off)
                        global
                        {only works in the GUI}
        The window that the mouse pointer is on is automatically activated.
        When changing the window layout or window focus in another way, the
        mouse pointer is moved to the window with keyboard focus.  Off is the
        default because it makes using the pull down menus a little goofy, as
        a pointer transit may activate a window unintentionally.
        MS-Windows: Also see 'scrollfocus' for what window is scrolled when
        using the mouse scroll wheel.

                        'mousehide' 'mh' 'nomousehide' 'nomh'
'mousehide' 'mh'        boolean (default on)
                        global
                        {only works in the GUI}
        When on, the mouse pointer is hidden when characters are typed.
        The mouse pointer is restored when the mouse is moved.

                                                'mousemodel' 'mousem'
'mousemodel' 'mousem'   string  (default "extend", "popup" for Win32)
                        global
        Sets the model to use for the mouse.  The name mostly specifies what
        the right mouse button is used for:
           extend       Right mouse button extends a selection.  This works
                        like in an xterm.
           popup        Right mouse button pops up a menu.  The shifted left
                        mouse button extends a selection.  This works like
                        with Microsoft Windows.
           popup_setpos Like "popup", but the cursor will be moved to the
                        position where the mouse was clicked, and thus the
                        selected operation will act upon the clicked object.
                        If clicking inside a selection, that selection will
                        be acted upon, i.e. no cursor move.  This implies of
                        course, that right clicking outside a selection will
                        end Visual mode.
        Overview of what button does what for each model:
        mouse               extend              popup(_setpos)
        left click          place cursor        place cursor
        left drag           start selection     start selection
        shift-left          search word         extend selection
        right click         extend selection    popup menu (place cursor)
        right drag          extend selection    -
        middle click        paste               paste

        In the "popup" model the right mouse button produces a pop-up menu.
        You need to define this first, see popup-menu.

        Note that you can further refine the meaning of buttons with mappings.
        See gui-mouse-mapping.  But mappings are NOT used for modeless
        selection (because that's handled in the GUI code directly).

        The 'mousemodel' option is set by the :behave command.

            'mousemoveevent' 'mousemev' 'nomousemoveevent' 'nomousemev'
'mousemoveevent' 'mousemev'  boolean    (default off)
                        global
                        {only works in the GUI}
        When on, mouse move events are delivered to the input queue and are
        available for mapping. The default, off, avoids the mouse movement
        overhead except when needed. See gui-mouse-mapping.
        Warning: Setting this option can make pending mappings to be aborted
        when the mouse is moved.
        Currently only works in the GUI, may be made to work in a terminal
        later.

                                        'mouseshape' 'mouses' E547
'mouseshape' 'mouses'   string  (default "i-r:beam,s:updown,sd:udsizing,
                                        vs:leftright,vd:lrsizing,m:no,
                                        ml:up-arrow,v:rightup-arrow")
                        global
                        {only available when compiled with the +mouseshape
                        feature}
        This option tells Vim what the mouse pointer should look like in
        different modes.  The option is a comma-separated list of parts, much
        like used for 'guicursor'.  Each part consist of a mode/location-list
        and an argument-list:
                mode-list:shape,mode-list:shape,..
        The mode-list is a dash separated list of these modes/locations:
                        In a normal window:
                n       Normal mode
                v       Visual mode
                ve      Visual mode with 'selection' "exclusive" (same as 'v',
                        if not specified)
                o       Operator-pending mode
                i       Insert mode
                r       Replace mode

                        Others:
                c       appending to the command-line
                ci      inserting in the command-line
                cr      replacing in the command-line
                m       at the 'Hit ENTER' or 'More' prompts
                ml      idem, but cursor in the last line
                e       any mode, pointer below last window
                s       any mode, pointer on a status line
                sd      any mode, while dragging a status line
                vs      any mode, pointer on a vertical separator line
                vd      any mode, while dragging a vertical separator line
                a       everywhere

        The shape is one of the following:
        avail   name            looks like
        w x     arrow           Normal mouse pointer
        w x     blank           no pointer at all (use with care!)
        w x     beam            I-beam
        w x     updown          up-down sizing arrows
        w x     leftright       left-right sizing arrows
        w x     busy            The system's usual busy pointer
        w x     no              The system's usual 'no input' pointer
          x     udsizing        indicates up-down resizing
          x     lrsizing        indicates left-right resizing
          x     crosshair       like a big thin +
          x     hand1           black hand
          x     hand2           white hand
          x     pencil          what you write with
          x     question        big ?
          x     rightup-arrow   arrow pointing right-up
        w x     up-arrow        arrow pointing up
          x     <number>        any X11 pointer number (see X11/cursorfont.h)

        The "avail" column contains a 'w' if the shape is available for Win32,
        x for X11.
        Any modes not specified or shapes not available use the normal mouse
        pointer.

        Example:
                :set mouseshape=s:udsizing,m:no
        will make the mouse turn to a sizing arrow over the status lines and
        indicate no input when the hit-enter prompt is displayed (since
        clicking the mouse has no effect in this state.)

                                                'mousetime' 'mouset'
'mousetime' 'mouset'    number  (default 500)
                        global
        Only for GUI, Win32 and Unix with xterm.  Defines the maximum
        time in msec between two mouse clicks for the second click to be
        recognized as a multi click.

                                                'msghistory' 'mhi'
'msghistory' 'mhi'      number  (default 500)
                        global
        Determines how many entries are remembered in the :messages history.
        The maximum value is 10000.
        Setting it to zero clears the message history.


                                                    'mzquantum' 'mzq'
'mzquantum' 'mzq'       number  (default 100)
                        global
                        {not available when compiled without the +mzscheme
                        feature}
        The number of milliseconds between polls for MzScheme threads.
        Negative or zero value means no thread scheduling.
        NOTE: This option is set to the Vim default value when 'compatible'
        is reset.

                                                'mzschemedll'
'mzschemedll'           string  (default depends on the build)
                        global
                        {only available when compiled with the +mzscheme/dyn
                        feature}
        Specifies the name of the MzScheme shared library. The default is
        DYNAMIC_MZSCH_DLL which was specified at compile time.
        Environment variables are expanded :set_env.
        The value must be set in the vimrc script or earlier.  In the
        startup, before the load-plugins step.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                                'mzschemegcdll'
'mzschemegcdll'         string  (default depends on the build)
                        global
                        {only available when compiled with the +mzscheme/dyn
                        feature}
        Specifies the name of the MzScheme GC shared library. The default is
        DYNAMIC_MZGC_DLL which was specified at compile time.
        The value can be equal to 'mzschemedll' if it includes the GC code.
        Environment variables are expanded :set_env.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                                        'nrformats' 'nf'
'nrformats' 'nf'        string  (default "bin,octal,hex",
                                           set to "bin,hex" in defaults.vim)
                        local to buffer
        This defines what bases Vim will consider for numbers when using the
        CTRL-A and CTRL-X commands for adding to and subtracting from a number
        respectively; see CTRL-A for more info on these commands.
        alpha   If included, single alphabetical characters will be
                incremented or decremented.  This is useful for a list with a
                letter index a), b), etc.               octal-nrformats
        octal   If included, numbers that start with a zero will be considered
                to be octal.  Example: Using CTRL-A on "007" results in "010".
        hex     If included, numbers starting with "0x" or "0X" will be
                considered to be hexadecimal.  Example: Using CTRL-X on
                "0x100" results in "0x0ff".
        bin     If included, numbers starting with "0b" or "0B" will be
                considered to be binary.  Example: Using CTRL-X on
                "0b1000" subtracts one, resulting in "0b0111".
        unsigned    If included, numbers are recognized as unsigned. Thus a
                leading dash or negative sign won't be considered as part of
                the number.  Examples:
                    Using CTRL-X on "2020" in "9-2020" results in "9-2019"
                    (without "unsigned" it would become "9-2021").
                    Using CTRL-A on "2020" in "9-2020" results in "9-2021"
                    (without "unsigned" it would become "9-2019").
                    Using CTRL-X on "0" or CTRL-A on "18446744073709551615"
                    (2^64 - 1) has no effect, overflow is prevented.
        blank   If included, treat numbers as signed or unsigned based on
                preceding whitespace.  If a number with a leading dash has its
                dash immediately preceded by a non-whitespace character (i.e.,
                not a tab or a " "), the negative sign won't be considered as
                part of the number.  For example:
                    Using CTRL-A on "14" in "Carbon-14" results in "Carbon-15"
                    (without "blank" it would become "Carbon-13").
                    Using CTRL-X on "8" in "Carbon -8" results in "Carbon -9"
                    (because -8 is preceded by whitespace.  If "unsigned" was
                    set, it would result in "Carbon -7").
                If this format is included, overflow is prevented as if
                "unsigned" were set.  If both this format and "unsigned" are
                included, "unsigned" will take precedence.

        Numbers which simply begin with a digit in the range 1-9 are always
        considered decimal.  This also happens for numbers that are not
        recognized as octal or hex.

                                'number' 'nu' 'nonumber' 'nonu'
'number' 'nu'           boolean (default off)
                        local to window
        Print the line number in front of each line.  When the 'n' option is
        excluded from 'cpoptions' a wrapped line will not use the column of
        line numbers (this is the default when 'compatible' isn't set).
        The 'numberwidth' option can be used to set the room used for the line
        number.
        When a long, wrapped line doesn't start with the first character, '-'
        characters are put before the number.
        For highlighting see hl-LineNr, and hl-CursorLineNr, and the
        :sign-define "numhl" argument.
                                                number_relativenumber
        The 'relativenumber' option changes the displayed number to be
        relative to the cursor.  Together with 'number' there are these
        four combinations (cursor in line 3):

                'nonu'          'nu'            'nonu'          'nu'
                'nornu'         'nornu'         'rnu'           'rnu'

            |apple          |  1 apple      |  2 apple      |  2 apple
            |pear           |  2 pear       |  1 pear       |  1 pear
            |nobody         |  3 nobody     |  0 nobody     |3   nobody
            |there          |  4 there      |  1 there      |  1 there

                                                'numberwidth' 'nuw'
'numberwidth' 'nuw'     number  (Vim default: 4  Vi default: 8)
                        local to window
                        {only available when compiled with the +linebreak
                        feature}
        Minimal number of columns to use for the line number.  Only relevant
        when the 'number' or 'relativenumber' option is set or printing lines
        with a line number. Since one space is always between the number and
        the text, there is one less character for the number itself.
        The value is the minimum width.  A bigger width is used when needed to
        fit the highest line number in the buffer respectively the number of
        rows in the window, depending on whether 'number' or 'relativenumber'
        is set. Thus with the Vim default of 4 there is room for a line number
        up to 999. When the buffer has 1000 lines five columns will be used.
        The minimum value is 1, the maximum value is 20.
        NOTE: This option is set to the Vi default value when 'compatible' is
        set and to the Vim default value when 'compatible' is reset.

                                                'omnifunc' 'ofu'
'omnifunc' 'ofu'        string  (default: empty)
                        local to buffer
                        {not available when compiled without the +eval
                        feature}
        This option specifies a function to be used for Insert mode omni
        completion with CTRL-X CTRL-Oi_CTRL-X_CTRL-O
        See complete-functions for an explanation of how the function is
        invoked and what it should return.  The value can be the name of a
        function, a lambda or a Funcref. See option-value-function for
        more information.
        This option is usually set by a filetype plugin:
        :filetype-plugin-on
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                            'opendevice' 'odev' 'noopendevice' 'noodev'
'opendevice' 'odev'     boolean (default off)
                        global
                        {only for MS-Windows}  E796
        Enable reading and writing from devices.  This may get Vim stuck on a
        device that can be opened but doesn't actually do the I/O.  Therefore
        it is off by default.
        Note that on MS-Windows editing "aux.h", "lpt1.txt" and the like also
        result in editing a device.

                                                'operatorfunc' 'opfunc'
'operatorfunc' 'opfunc' string  (default: empty)
                        global
        This option specifies a function to be called by the g@ operator.
        See :map-operator for more info and an example.  The value can be
        the name of a function, a lambda or a Funcref. See
        option-value-function for more information.

        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                        'osfiletype' 'oft'
'osfiletype' 'oft'      string (default: "")
                        local to buffer
        This option was supported on RISC OS, which has been removed.

                                'packpath' 'pp'
'packpath' 'pp'         string  (default: see 'runtimepath')
        Directories used to find packages.  See packages.
        This option cannot be set from a modeline or in the sandbox, for
        security reasons.

                                                'paragraphs' 'para'
'paragraphs' 'para'     string  (default "IPLPPPQPP TPHPLIPpLpItpplpipbp")
                        global
        Specifies the nroff macros that separate paragraphs.  These are pairs
        of two letters (see object-motions).

                                                'paste' 'nopaste'
'paste'                 boolean (default off)
                        global
        Put Vim in Paste mode.  This is useful if you want to cut or copy
        some text from one window and paste it in Vim.  This will avoid
        unexpected effects.
        Setting this option is useful when using Vim in a terminal, where Vim
        cannot distinguish between typed text and pasted text.  In the GUI, Vim
        knows about pasting and will mostly do the right thing without 'paste'
        being set.  The same is true for a terminal where Vim handles the
        mouse clicks itself.
        This option is reset when starting the GUI.  Thus if you set it in
        your .vimrc it will work in a terminal, but not in the GUI.  Setting
        'paste' in the GUI has side effects: e.g., the Paste toolbar button
        will no longer work in Insert mode, because it uses a mapping.
        When the 'paste' option is switched on (also when it was already on):
                - mapping in Insert mode and Command-line mode is disabled
                - abbreviations are disabled
                - 'autoindent' is reset
                - 'expandtab' is reset
                - 'hkmap' is reset
                - 'revins' is reset
                - 'ruler' is reset
                - 'showmatch' is reset
                - 'smarttab' is reset
                - 'softtabstop' is set to 0
                - 'textwidth' is set to 0
                - 'wrapmargin' is set to 0
                - 'varsofttabstop' is made empty
        These options keep their value, but their effect is disabled:
                - 'cindent'
                - 'formatoptions' is used like it is empty
                - 'indentexpr'
                - 'lisp'
                - 'smartindent'
        NOTE: When you start editing another file while the 'paste' option is
        on, settings from the modelines or autocommands may change the
   &nbs