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terminal - Vim Documentation

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terminal.txt  For Vim version 9.1.  Last change: 2024 Jun 20

                  VIM REFERENCE MANUAL    by Bram Moolenaar

Terminal window support                         terminal terminal-window

The terminal feature is optional, use this to check if your Vim has it:
        echo has('terminal')
If the result is "1" you have it.

1. Basic use                            terminal-use
      Typing                                    terminal-typing
      Size and color                            terminal-size-color
      Command syntax                            :terminal
      Resizing                                  terminal-resizing
      Terminal Modes                            Terminal-mode
      Cursor style                              terminal-cursor-style
      Session                                   terminal-session
      Special keys                              terminal-special-keys
      Unix                                      terminal-unix
      MS-Windows                                terminal-ms-windows
2. Terminal functions                   terminal-function-details
3. Terminal communication               terminal-communication
      Vim to job: term_sendkeys()               terminal-to-job
      Job to Vim: JSON API                      terminal-api
      Using the client-server feature           terminal-client-server
4. Remote testing                       terminal-testing
5. Diffing screen dumps                 terminal-diff
      Writing a screen dump test for Vim        terminal-dumptest
      Creating a screen dump                    terminal-screendump
      Comparing screen dumps                    terminal-diffscreendump
6. Debugging                            terminal-debug
      Starting                                  termdebug-starting
      Example session                           termdebug-example
      Stepping through code                     termdebug-stepping
      Inspecting variables                      termdebug-variables
      Navigating stack frames                   termdebug-frames
      Other commands                            termdebug-commands
      Events                                    termdebug-events
      Prompt mode                               termdebug-prompt
      Mappings                                  termdebug-mappings
      Communication                             termdebug-communication
      Customizing                               termdebug-customizing

{only available when compiled with the +terminal feature}
The terminal feature requires the +job and +channel features.

1. Basic use                                            terminal-use

This feature is for running a terminal emulator in a Vim window.  A job can be
started connected to the terminal emulator. For example, to run a shell:
     :term bash

Or to run build command:
     :term make myprogram

The job runs asynchronously from Vim, the window will be updated to show
output from the job, also while editing in another window.

When the keyboard focus is in the terminal window, typed keys will be sent to
the job.  This uses a pty when possible.  You can click outside of the
terminal window to move keyboard focus elsewhere.

                                                t_CTRL-W_CTRL-W t_CTRL-W_:
CTRL-W can be used to navigate between windows and other CTRL-W commands, e.g.:
        CTRL-W CTRL-W   move focus to the next window
        CTRL-W :        enter an Ex command
See CTRL-W for more commands.

Special in the terminal window:                 t_CTRL-W_.  t_CTRL-W_N
        CTRL-W .        send a CTRL-W to the job in the terminal
        CTRL-W CTRL-\   send a CTRL-\ to the job in the terminal
        CTRL-W N        go to Terminal-Normal mode, see Terminal-mode
        CTRL-\ CTRL-N   go to Terminal-Normal mode, see Terminal-mode
        CTRL-W " {reg}  paste register {reg}            t_CTRL-W_quote
                        Also works with the = register to insert the result of
                        evaluating an expression.
        CTRL-W CTRL-C   ends the job, see below t_CTRL-W_CTRL-C
        CTRL-W gt       go to next tabpage, same as gt        t_CTRL-W_gt
        CTRL-W gT       go to previous tabpage, same as gT    t_CTRL-W_gT

See option 'termwinkey' for specifying another key instead of CTRL-W that
will work like CTRL-W.  However, typing 'termwinkey' twice sends 'termwinkey'
to the job.  For example:
        'termwinkey' CTRL-W    move focus to the next window
        'termwinkey' :         enter an Ex command
        'termwinkey' 'termwinkey' send 'termwinkey' to the job in the terminal
        'termwinkey' .         send 'termwinkey' to the job in the terminal
        'termwinkey' CTRL-\    send a CTRL-\ to the job in the terminal
        'termwinkey' N         go to terminal Normal mode, see below
        'termwinkey' CTRL-N    same as CTRL-W N t_CTRL-W_N
        'termwinkey' CTRL-C    same as CTRL-W CTRL-C t_CTRL-W_CTRL-C
The special key combination CTRL-\ CTRL-N can be used to switch to Normal
mode, just like this works in any other mode.
CTRL-W CTRL-C can be typed to forcefully end the job.  On MS-Windows a
CTRL-Break will also kill the job.

If you type CTRL-C the effect depends on what the pty has been configured to
do.  For simple commands this causes a SIGINT to be sent to the job, which
would end it.  Other commands may ignore the SIGINT or handle the CTRL-C
themselves (like Vim does).

To change the keys you type use terminal mode mappings, see :tmap.
These are defined like any mapping, but apply only when typing keys that are
sent to the job running in the terminal.  For example, to make F1 switch
to Terminal-Normal mode:
   tnoremap <F1> <C-W>N
You can use Esc, but you need to make sure it won't cause other keys to
break (cursor keys start with an Esc, so they may break), this probably only
works in the GUI:
   tnoremap <Esc> <C-W>N
   set notimeout ttimeout timeoutlen=100

You can also create menus similar to terminal mode mappings, but you have to
use :tlmenu instead of :tmenu.

After opening the terminal window and setting 'buftype' to "terminal" the
TerminalWinOpen autocommand event is triggered.  This makes it possible to set
options specifically for the terminal window and buffer.  Example:
   au TerminalWinOpen * setlocal bufhidden=hide
This only works properly if the terminal is not hidden.

For both hidden and non-hidden terminals this works, both for buffer-local and
window-local options:
   au TerminalWinOpen,BufWinEnter * if &buftype == 'terminal'
        \ | setlocal bufhidden=hide colorcolumn=123
        \ | endif
Note that for a hidden terminal the options are not set until the terminal is
no longer hidden.

There is also the TerminalOpen event.  Keep in mind this may be triggered
for a hidden terminal, then the current window and buffer are not that of the
new terminal.
You need to use <abuf>, which is set to the terminal buffer.  Example:
    au TerminalOpen * call setbufvar(expand('<abuf>')->str2nr(),
            \ '&termwinscroll', 1000)
For a window-local option, you need to delay setting the option until the
terminal window has been created (this only works for a hidden terminal):
    au TerminalOpen * exe printf(
        \    'au BufWinEnter <buffer=%d> ++once setlocal colorcolumn=%d',
        \       expand('<abuf>')->str2nr(), 123)
For a non-hidden terminal use TerminalWinOpen.

Mouse events (click and drag) are passed to the terminal.  Mouse move events
are only passed when Vim itself is receiving them.  For a terminal that is
when 'balloonevalterm' is enabled.

Size and color
See option 'termwinsize' for controlling the size of the terminal window.
(TODO: scrolling when the terminal is larger than the window)

The job running in the terminal can change the colors.  The default foreground
and background colors are taken from Vim, the Normal highlight group.

For a color terminal the 'background' option is used to decide whether the
terminal window will start with a white or black background.

To use a different color the Terminal highlight group can be used, for
    hi Terminal ctermbg=lightgrey ctermfg=blue guibg=lightgrey guifg=blue
Instead of Terminal another group can be specified with the "term_highlight"
option for term_start().

In GUI mode or with 'termguicolors', the 16 ANSI colors used by default in new
terminal windows may be configured using the variable
g:terminal_ansi_colors, which should be a list of 16 color names or
hexadecimal color codes, similar to those accepted by highlight-guifg.  When
not using GUI colors, the terminal window always uses the 16 ANSI colors of
the underlying terminal.
When using term_start() the colors can be set with the "ansi_colors" option.
The term_setansicolors() function can be used to change the colors, and
term_getansicolors() to get the currently used colors.

Command syntax

:[range]ter[minal] [options] [command]                  :ter :terminal
                        Open a new terminal window.

                        If [command] is provided run it as a job and connect
                        the input and output to the terminal.
                        If [command] is not given the 'shell' option is used.
                        if [command] is NONE no job is started, the pty of the
                        terminal can be used by a command like gdb.

                        If [command] is missing the default behavior is to
                        close the terminal when the shell exits.  This can be
                        changed with the ++noclose argument.
                        If [command] is present the default behavior is to
                        keep the terminal open in Terminal-Normal mode.  This
                        can be changed with the ++close argument.

                        No Vim command can follow, any | is included in
                        [command].  Use :execute if you must have a Vim
                        command following in the same line.

                        A new buffer will be created, using [command] or
                        'shell' as the name, prefixed with a "!".  If a buffer
                        by this name already exists a number is added in
                        parentheses.  E.g. if "gdb" exists the second terminal
                        buffer will use "!gdb (1)".

                        If [range] is given the specified lines are used as
                        input for the job.  It will not be possible to type
                        keys in the terminal window.  For MS-Windows see the
                        ++eof argument below.

                                                term++close term++open
                        Supported [options] are:
                        ++close         The terminal window will close
                                        automatically when the job terminates.
                        ++noclose       The terminal window will NOT close
                                        automatically when the job terminates.
                        ++open          When the job terminates and no window
                                        shows it, a window will be opened.
                                        Note that this can be interruptive.
                                The last of ++close, ++noclose and ++open
                                matters and rules out earlier arguments.

                        ++curwin        Open the terminal in the current
                                        window, do not split the current
                                        window.  Fails if the current buffer
                                        cannot be abandoned.
                        ++hidden        Open the terminal in a hidden buffer,
                                        no window will be used.
                        ++norestore     Do not include this terminal window
                                        in a session file.
                        ++shell         Instead of executing {command}
                                        directly, use a shell, like with
                                        :!command             E279
                                        {only works on Unix and MS-Windows}
                        ++kill={how}    When trying to close the terminal
                                        window kill the job with {how}.  See
                                        term_setkill() for the values.
                        ++rows={height} Use {height} for the terminal window
                                        height.  If the terminal uses the full
                                        Vim height (no window above or below
                                        the terminal window) the command line
                                        height will be reduced as needed.
                        ++cols={width}  Use {width} for the terminal window
                                        width. If the terminal uses the full
                                        Vim width (no window left or right of
                                        the terminal window) this value is
                        ++eof={text}    When using [range]: text to send after
                                        the last line was written. Cannot
                                        contain white space.  A CR is
                                        appended.  For MS-Windows the default
                                        is to send CTRL-D.
                                        E.g. for a shell use "++eof=exit" and
                                        for Python "++eof=exit()".  Special
                                        codes can be used like with :map,
                                        e.g. "<C-Z>" for CTRL-Z.
                        ++type={pty}    (MS-Windows only): Use {pty} as the
                                        virtual console.  See 'termwintype'
                                        for the values.
                        ++api={expr}    Permit the function name starting with
                                        {expr} to be called as terminal-api
                                        function.  If {expr} is empty then no
                                        function can be called.

                        If you want to use more options use the term_start()
                        If you want to split the window vertically, use:
                                :vertical terminal
                        Or short:
                                :vert ter

When the buffer associated with the terminal is forcibly unloaded or wiped out
the job is killed, similar to calling job_stop(job, "kill") .
Closing the window normally results in E947.  When a kill method was set
with "++kill={how}" or term_setkill() then closing the window will use that
way to kill or interrupt the job.  For example:
        :term ++kill=term tail -f /tmp/log

So long as the job is running the window behaves like it contains a modified
buffer.  Trying to close the window with CTRL-W :quit fails.  When using
CTRL-W :quit! the job is ended.  The text in the window is lost, the buffer
is deleted.  With CTRL-W :bunload! the buffer remains but will be empty.

Trying to close the window with CTRL-W :close also fails.   Using
CTRL-W :close! will close the window and make the buffer hidden.

You can use CTRL-W :hide to close the terminal window and make the buffer
hidden, the job keeps running.  The :buffer command can be used to turn the
current window into a terminal window.  If there are unsaved changes this
fails, use ! to force, as usual.

When the terminal job finishes and no [command] was given (e.g. the 'shell'
command was executed), the terminal window will be closed by default (unless
the buffer in next window receiving the space has the 'nobuflisted' option set,
in which case the terminal window would not be closed automatically, but a new
empty buffer would be opened in that window).

When the terminal window is closed, e.g. when the shell exits and "++close"
argument was used, and this is the last normal Vim window, then Vim will exit.
This is like using :quit in a normal window. Help and preview windows are
not counted.

To have a background job run without a window, and open the window when it's
done, use options like this:
        :term ++hidden ++open make
Note that the window will open at an unexpected moment, this will interrupt
what you are doing.

                                                        E947 E948
So long as the job is running, the buffer is considered modified and Vim
cannot be quit easily, see abandon.

When the job has finished and no changes were made to the buffer: closing the
window will wipe out the buffer.

Before changes can be made to a terminal buffer, the 'modifiable' option must
be set.  This is only possible when the job has finished.  At the first change
the buffer will become a normal buffer and the highlighting is removed.
You may want to change the buffer name with :file to be able to write, since
the buffer name will still be set to the command.

The size of the terminal can be in one of three modes:

1. The 'termwinsize' option is empty: The terminal size follows the window
   size.  The minimal size is 2 screen lines with 10 cells.

2. The 'termwinsize' option is "rows*cols", where "rows" is the minimal number
   of screen rows and "cols" is the minimal number of cells.

3. The 'termwinsize' option is "rowsXcols" (where the x is upper or lower
   case).  The terminal size is fixed to the specified number of screen lines
   and cells.  If the window is bigger there will be unused empty space.

If the window is smaller than the terminal size, only part of the terminal can
be seen (the lower-left part).

The term_getsize() function can be used to get the current size of the
terminal.  term_setsize() can be used only when in the first or second mode,
not when 'termwinsize' is "rowsXcols".

Terminal-Job and Terminal-Normal mode
                                                Terminal-mode Terminal-Job
When the job is running the contents of the terminal is under control of the
job.  That includes the cursor position.  Typed keys are sent to the job.
The terminal contents can change at any time.  This is called Terminal-Job

Use CTRL-W N (or 'termwinkey' N) to switch to Terminal-Normal mode.  Now the
contents of the terminal window is under control of Vim, the job output is
suspended.  CTRL-\ CTRL-N does the same.

Terminal-Job mode is where :tmap mappings are applied. Keys sent by
term_sendkeys() are not subject to tmap, but keys from feedkeys() are.

It is not possible to enter Insert mode from Terminal-Job mode.

                                                Terminal-Normal E946
In Terminal-Normal mode you can move the cursor around with the usual Vim
commands, Visually mark text, yank text, etc.  But you cannot change the
contents of the buffer.  The commands that would start insert mode, such as
'i' and 'a', return to Terminal-Job mode.  The window will be updated to show
the contents of the terminal. :startinsert is ineffective.

In Terminal-Normal mode the statusline and window title show "(Terminal)".  If
the job ends while in Terminal-Normal mode this changes to

When the job outputs lines in the terminal, such that the contents scrolls off
the top, those lines are remembered and can be seen in Terminal-Normal mode.
The number of lines is limited by the 'termwinscroll' option. When going over
this limit, the first 10% of the scrolled lines are deleted and are lost.

Cursor style
By default the cursor in the terminal window uses a not blinking block.  The
normal xterm escape sequences can be used to change the blinking state and the
shape.  Once focus leaves the terminal window Vim will restore the original

An exception is when xterm is started with the "-bc" argument, or another way
that causes the cursor to blink.  This actually means that the blinking flag
is inverted.  Since Vim cannot detect this, the terminal window cursor
blinking will also be inverted.

A terminal window will be restored when using a session file, if possible and

If "terminal" was removed from 'sessionoptions' then no terminal windows will
be restored.

If the job in the terminal was finished the window will not be restored.

If the terminal can be restored, the command that was used to open it will be
used again.  To change this use the term_setrestore() function.  This can
also be used to not restore a specific terminal by setting the command to

Special keys
Since the terminal emulator simulates an xterm, only escape sequences that
both Vim and xterm recognize will be available in the terminal window.  If you
want to pass on other escape sequences to the job running in the terminal you
need to set up forwarding.  Example:
        tmap <expr> <Esc>]b SendToTerm("\<Esc>]b")
        func SendToTerm(what)
          call term_sendkeys('', a:what)
          return ''

On Unix a pty is used to make it possible to run all kinds of commands.  You
can even run Vim in the terminal!  That's used for debugging, see below.

Environment variables are used to pass information to the running job:
    TERM                the name of the terminal, from the 'term' option or
                        $TERM in the GUI; falls back to "xterm" if it does not
                        start with "xterm"
    ROWS                number of rows in the terminal initially
    LINES               same as ROWS
    COLUMNS             number of columns in the terminal initially
    COLORS              number of colors, 't_Co' (256*256*256 in the GUI)
    VIM_SERVERNAME      v:servername
    VIM_TERMINAL        v:version

On MS-Windows winpty is used to make it possible to run all kind of commands.
Obviously, they must be commands that run in a terminal, not open their own

You need the following two files from winpty:


You can download them from the following page:

Just put the files somewhere in your PATH.  You can set the 'winptydll' option
to point to the right file, if needed.  If you have both the 32-bit and 64-bit
version, rename to winpty32.dll and winpty64.dll to match the way Vim was
                                                        ConPTY E982
On more recent versions of MS-Windows 10 (beginning with the "October 2018
Update"), winpty is no longer required. On those versions, :terminal will use
Windows' built-in support for hosting terminal applications, "ConPTY".  When
ConPTY is in use, there may be rendering artifacts regarding ambiguous-width
characters. If you encounter any such issues, install "winpty".  Until the
ConPTY problems have been fixed "winpty" will be preferred.

Environment variables are used to pass information to the running job:
    VIM_SERVERNAME      v:servername

2. Terminal functions                            terminal-function-details

term_dumpdiff({filename}{filename} [, {options}])
                Open a new window displaying the difference between the two
                files.  The files must have been created with
                Returns the buffer number or zero when the diff fails.
                Also see terminal-diff.
                NOTE: this does not work with double-width characters yet.

                The top part of the buffer contains the contents of the first
                file, the bottom part of the buffer contains the contents of
                the second file.  The middle part shows the differences.
                The parts are separated by a line of equals.

                If the {options} argument is present, it must be a Dict with
                these possible members:
                   "term_name"       name to use for the buffer name, instead
                                     of the first file name.
                   "term_rows"       vertical size to use for the terminal,
                                     instead of using 'termwinsize', but
                                     respecting the minimal size
                   "term_cols"       horizontal size to use for the terminal,
                                     instead of using 'termwinsize', but
                                     respecting the minimal size
                   "vertical"        split the window vertically
                   "curwin"          use the current window, do not split the
                                     window; fails if the current buffer
                                     cannot be abandoned
                   "bufnr"           do not create a new buffer, use the
                                     existing buffer "bufnr".  This buffer
                                     must have been previously created with
                                     term_dumpdiff() or term_dumpload() and
                                     visible in a window.
                   "norestore"       do not add the terminal window to a
                                     session file

                Each character in the middle part indicates a difference. If
                there are multiple differences only the first in this list is
                        X       different character
                        w       different width
                        f       different foreground color
                        b       different background color
                        a       different attribute
                        +       missing position in first file
                        -       missing position in second file
                        >       cursor position in first file, not in second
                        <       cursor position in second file, not in first

                Using the "s" key the top and bottom parts are swapped.  This
                makes it easy to spot a difference.

                Can also be used as a method:

                Return type: Number

term_dumpload({filename} [, {options}])                 term_dumpload()
                Open a new window displaying the contents of {filename}
                The file must have been created with term_dumpwrite().
                Returns the buffer number or zero when it fails.
                Also see terminal-diff.

                For {options} see term_dumpdiff().

                Can also be used as a method:

                Return type: Number

term_dumpwrite({buf}{filename} [, {options}])         term_dumpwrite()
                Dump the contents of the terminal screen of {buf} in the file
                {filename}.  This uses a format that can be used with
                term_dumpload() and term_dumpdiff().
                If the job in the terminal already finished an error is given:
                If {filename} already exists an error is given: E953
                Also see terminal-diff.

                {options} is a dictionary with these optional entries:
                        "rows"          maximum number of rows to dump
                        "columns"       maximum number of columns to dump

                Can also be used as a method, the base is used for the file

                Return type: Number

term_getaltscreen({buf})                                term_getaltscreen()
                Returns 1 if the terminal of {buf} is using the alternate
                {buf} is used as with term_getsize().

                Can also be used as a method:

                Return type: Number

term_getansicolors({buf})                               term_getansicolors()
                Get the ANSI color palette in use by terminal {buf}.
                Returns a List of length 16 where each element is a String
                representing a color in hexadecimal "#rrggbb" format.
                Also see term_setansicolors() and g:terminal_ansi_colors.
                If neither was used returns the default colors.

                {buf} is used as with term_getsize().  If the buffer does not
                exist or is not a terminal window, an empty list is returned.

                Can also be used as a method:

                Return type: list<string> or list<any>

                {only available when compiled with GUI enabled and/or the
                +termguicolors feature}

term_getattr({attr}{what})                            term_getattr()
                Given {attr}, a value returned by term_scrape() in the "attr"
                item, return whether {what} is on.  {what} can be one of:

                Can also be used as a method:

                Return type: Number

term_getcursor({buf})                                   term_getcursor()
                Get the cursor position of terminal {buf}. Returns a list with
                two numbers and a dictionary: [row, col, dict].

                "row" and "col" are one based, the first screen cell is row
                1, column 1.  This is the cursor position of the terminal
                itself, not of the Vim window.

                "dict" can have these members:
                   "visible"    one when the cursor is visible, zero when it
                                is hidden.
                   "blink"      one when the cursor is blinking, zero when it
                                is not blinking.
                   "shape"      1 for a block cursor, 2 for underline and 3
                                for a vertical bar.
                   "color"      color of the cursor, e.g. "green"

                {buf} must be the buffer number of a terminal window. If the
                buffer does not exist or is not a terminal window, an empty
                list is returned.

                Can also be used as a method:

                Return type: list<any>

term_getjob({buf})                                      term_getjob()
                Get the Job associated with terminal window {buf}.
                {buf} is used as with term_getsize().
                Returns v:null when there is no job. In Vim9 script, return
                null_job when there is no job.

                Can also be used as a method:

                Return type: job

term_getline({buf}{row})                              term_getline()
                Get a line of text from the terminal window of {buf}.
                {buf} is used as with term_getsize().

                The first line has {row} one.  When {row} is "." the cursor
                line is used.  When {row} is invalid an empty string is

                To get attributes of each character use term_scrape().

                Can also be used as a method:

                Return type: String

term_getscrolled({buf})                                 term_getscrolled()
                Return the number of lines that scrolled to above the top of
                terminal {buf}.  This is the offset between the row number
                used for term_getline() and getline(), so that:
                        term_getline(buf, N)
                is equal to:
                        getline(N + term_getscrolled(buf))
                (if that line exists).

                {buf} is used as with term_getsize().

                Can also be used as a method:

                Return type: Number

term_getsize({buf})                                     term_getsize()
                Get the size of terminal {buf}. Returns a list with two
                numbers: [rows, cols].  This is the size of the terminal, not
                the window containing the terminal.

                {buf} must be the buffer number of a terminal window.  Use an
                empty string for the current buffer.  If the buffer does not
                exist or is not a terminal window, an empty list is returned.

                Can also be used as a method:

                Return type: list<number> or list<any>

term_getstatus({buf})                                   term_getstatus()
                Get the status of terminal {buf}. This returns a String with
                a comma-separated list of these items:
                        running         job is running
                        finished        job has finished
                        normal          in Terminal-Normal mode
                One of "running" or "finished" is always present.

                {buf} must be the buffer number of a terminal window. If the
                buffer does not exist or is not a terminal window, an empty
                string is returned.

                Can also be used as a method:

                Return type: String

term_gettitle({buf})                                    term_gettitle()
                Get the title of terminal {buf}. This is the title that the
                job in the terminal has set.

                {buf} must be the buffer number of a terminal window. If the
                buffer does not exist or is not a terminal window, an empty
                string is returned.

                Can also be used as a method:

                Return type: String

term_gettty({buf} [, {input}])                          term_gettty()
                Get the name of the controlling terminal associated with
                terminal window {buf}.  {buf} is used as with term_getsize().

                When {input} is omitted or 0, return the name for writing
                (stdout). When {input} is 1 return the name for reading
                (stdin). On UNIX, both return same name.

                Can also be used as a method:

                Return type: String

term_list()                                             term_list()
                Return a list with the buffer numbers of all buffers for
                terminal windows.

                Return type: list<number> or list<any>

term_scrape({buf}{row})                               term_scrape()
                Get the contents of {row} of terminal screen of {buf}.
                For {buf} see term_getsize().

                The first line has {row} one.  When {row} is "." the cursor
                line is used.  When {row} is invalid an empty string is

                Return a List containing a Dict for each screen cell:
                    "chars"     character(s) at the cell
                    "fg"        foreground color as #rrggbb
                    "bg"        background color as #rrggbb
                    "attr"      attributes of the cell, use term_getattr()
                                to get the individual flags
                    "width"     cell width: 1 or 2
                For a double-width cell there is one item, thus the list can
                be shorter than the width of the terminal.

                Can also be used as a method:

                Return type: list<dict<any>> or list<any>

term_sendkeys({buf}{keys})                            term_sendkeys()
                Send keystrokes {keys} to terminal {buf}.
                {buf} is used as with term_getsize().

                {keys} are translated as key sequences. For example, "\<c-x>"
                means the character CTRL-X.

                Can also be used as a method:

                Return type: Number

term_setansicolors({buf}{colors})                     term_setansicolors()
                Set the ANSI color palette used by terminal {buf}.
                {colors} must be a List of 16 valid color names or hexadecimal
                color codes, like those accepted by highlight-guifg.
                Also see term_getansicolors() and g:terminal_ansi_colors.

                The colors normally are:
                        0    black
                        1    dark red
                        2    dark green
                        3    brown
                        4    dark blue
                        5    dark magenta
                        6    dark cyan
                        7    light grey
                        8    dark grey
                        9    red
                        10   green
                        11   yellow
                        12   blue
                        13   magenta
                        14   cyan
                        15   white

                These colors are used in the GUI and in the terminal when
                'termguicolors' is set.  When not using GUI colors (GUI mode
                or 'termguicolors'), the terminal window always uses the 16
                ANSI colors of the underlying terminal.

                Can also be used as a method:

                Return type: Number

                {only available with GUI enabled and/or the +termguicolors

term_setapi({buf}{expr})                              term_setapi()
                Set the function name prefix to be used for the terminal-api
                function in terminal {buf}.  For example:
                    :call term_setapi(buf, "Myapi_")
                    :call term_setapi(buf, "")

                The default is "Tapi_".  When {expr} is an empty string then
                no terminal-api function can be used for {buf}.

                When used as a method the base is used for {buf}:

                Return type: Number

term_setkill({buf}{how})                              term_setkill()
                When exiting Vim or trying to close the terminal window in
                another way, {how} defines whether the job in the terminal can
                be stopped.
                When {how} is empty (the default), the job will not be
                stopped, trying to exit will result in E947.
                Otherwise, {how} specifies what signal to send to the job.
                See job_stop() for the values.

                After sending the signal Vim will wait for up to a second to
                check that the job actually stopped.

                Can also be used as a method:

                Return type: Number

term_setrestore({buf}{command})                       term_setrestore()
                Set the command to write in a session file to restore the job
                in this terminal.  The line written in the session file is:
                        terminal ++curwin ++cols=%d ++rows=%d {command}
                Make sure to escape the command properly.

                Use an empty {command} to run 'shell'.
                Use "NONE" to not restore this window.

                Can also be used as a method:

                Return type: Number

term_setsize({buf}{rows}{cols})             term_setsize() E955
                Set the size of terminal {buf}. The size of the window
                containing the terminal will also be adjusted, if possible.
                If {rows} or {cols} is zero or negative, that dimension is not

                {buf} must be the buffer number of a terminal window.  Use an
                empty string for the current buffer.  If the buffer does not
                exist or is not a terminal window, an error is given.

                Can also be used as a method:
                        GetBufnr()->term_setsize(rows, cols)

                Return type: Number

term_start({cmd} [, {options}])                 term_start()
                Open a terminal window and run {cmd} in it.

                {cmd} can be a string or a List, like with job_start(). The
                string "NONE" can be used to open a terminal window without
                starting a job, the pty of the terminal can be used by a
                command like gdb.

                Returns the buffer number of the terminal window.  If {cmd}
                cannot be executed the window does open and shows an error
                If opening the window fails zero is returned.

                {options} are similar to what is used for job_start(), see
                job-options.  However, not all options can be used.  These
                are supported:
                   all timeout options
                   "stoponexit", "cwd", "env"
                   "callback", "out_cb", "err_cb", "exit_cb", "close_cb"
                   "in_io", "in_top", "in_bot", "in_name", "in_buf"
                   "out_io", "out_name", "out_buf", "out_modifiable", "out_msg"
                   "err_io", "err_name", "err_buf", "err_modifiable", "err_msg"
                However, at least one of stdin, stdout or stderr must be
                connected to the terminal.  When I/O is connected to the
                terminal then the callback function for that part is not used.

                There are extra options:
                   "term_name"       name to use for the buffer name, instead
                                     of the command name.
                   "term_rows"       vertical size to use for the terminal,
                                     instead of using 'termwinsize'; valid
                                     range is from zero to 1000
                   "term_cols"       horizontal size to use for the terminal,
                                     instead of using 'termwinsize'
                   "vertical"        split the window vertically; note that
                                     other window position can be defined with
                                     command modifiers, such as :belowright.
                   "curwin"          use the current window, do not split the
                                     window; fails if the current buffer
                                     cannot be abandoned
                   "hidden"          do not open a window
                   "norestore"       do not add the terminal window to a
                                     session file
                   "term_kill"       what to do when trying to close the
                                     terminal window, see term_setkill()
                   "term_finish"     What to do when the job is finished:
                                        "close": close any windows
                                        "open": open window if needed
                                     Note that "open" can be interruptive.
                                     See term++close and term++open.
                   "term_opencmd"    command to use for opening the window when
                                     "open" is used for "term_finish"; must
                                     have "%d" where the buffer number goes,
                                     e.g. "10split|buffer %d"; when not
                                     specified "botright sbuf %d" is used
                   "term_highlight"  highlight group to use instead of
                   "eof_chars"       Text to send after all buffer lines were
                                     written to the terminal.  When not set
                                     CTRL-D is used on MS-Windows. For Python
                                     use CTRL-Z or "exit()". For a shell use
                                     "exit".  A CR is always added.
                   "ansi_colors"     A list of 16 color names or hex codes
                                     defining the ANSI palette used in GUI
                                     color modes.  See g:terminal_ansi_colors.
                   "tty_type"        (MS-Windows only): Specify which pty to
                                     use.  See 'termwintype' for the values.
                   "term_api"        function name prefix for the
                                     terminal-api function.  See

                Can also be used as a method:

                Return type: Number

term_wait({buf} [, {time}])                                     term_wait()
                Wait for pending updates of {buf} to be handled.
                {buf} is used as with term_getsize().
                {time} is how long to wait for updates to arrive in msec.  If
                not set then 10 msec will be used.

                Can also be used as a method:

                Return type: Number

3. Terminal communication                        terminal-communication

There are several ways to communicate with the job running in a terminal:
- Use term_sendkeys() to send text and escape sequences from Vim to the job.
- Use the JSON API to send encoded commands from the job to Vim.
- Use the client-server mechanism. This works on machines with an X server
  and on MS-Windows.

Vim to job: term_sendkeys()
This allows for remote controlling the job running in the terminal.  It is a
one-way mechanism.  The job can update the display to signal back to Vim.
For example, if a shell is running in a terminal, you can do:
        call term_sendkeys(buf, "ls *.java\<CR>")

This requires for the job to be in the right state where it will do the right
thing when receiving the keys.  For the above example, the shell must be
waiting for a command to be typed.

For a job that was written for the purpose, you can use the JSON API escape
sequence in the other direction.  E.g.:
        call term_sendkeys(buf, "\<Esc>]51;["response"]\x07")

Job to Vim: JSON API
The job can send JSON to Vim, using a special escape sequence.  The JSON
encodes a command that Vim understands.  Example of such a message:
        <Esc>]51;["drop", ""]<07>

The body is always a list, making it easy to find the end: ]<07>.
The <Esc>]51;msg<07> sequence is reserved by xterm for "Emacs shell", which is
similar to what we are doing here.

Currently supported commands:

        call {funcname} {argument}

                Call a user defined function with {argument}.
                The function is called with two arguments: the buffer number
                of the terminal and {argument}, the decoded JSON argument.
                By default, the function name must start with "Tapi_" to avoid
                accidentally calling a function not meant to be used for the
                terminal API.  This can be changed with term_setapi().
                The user function should sanity check the argument.
                The function can use term_sendkeys() to send back a reply.
                Example in JSON:
                        ["call", "Tapi_Impression", ["play", 14]]
                Calls a function defined like this:
                        function Tapi_Impression(bufnum, arglist)
                          if len(a:arglist) == 2
                            echomsg "impression " .. a:arglist[0]
                            echomsg "count " .. a:arglist[1]
                Output from :echo may be erased by a redraw, use :echomsg
                to be able to see it with :messages.

        drop {filename} [options]

                Let Vim open a file, like the :drop command.  If {filename}
                is already open in a window, switch to that window.  Otherwise
                open a new window to edit {filename}.
                Note that both the job and Vim may change the current
                directory, thus it's best to use the full path.

                [options] is only used when opening a new window.  If present,
                it must be a Dict.  Similarly to ++opt, these entries are
                  "ff"          file format: "dos", "mac" or "unix"
                  "fileformat"  idem
                  "enc"         overrides 'fileencoding'
                  "encoding"    idem
                  "bin"         sets 'binary'
                  "binary"      idem
                  "nobin"       resets 'binary'
                  "nobinary"    idem
                  "bad"         specifies behavior for bad characters, see

                Example in JSON:
                        ["drop", "path/file.txt", {"ff": "dos"}]

A trick to have Vim send this escape sequence:
        exe "set t_ts=\<Esc>]51; t_fs=\x07"
        let &titlestring = '["call","Tapi_TryThis",["hello",123]]'
        set t_ts& t_fs&

Rationale: Why not allow for any command or expression?  Because that might
create a security problem.
This can be used to pass the current directory from a shell to Vim.
Put this in your .vimrc:
        def g:Tapi_lcd(_, path: string)
            if isdirectory(path)
                execute 'silent lcd ' .. fnameescape(path)

And, in a bash init file:
        if [[ -n "$VIM_TERMINAL" ]]; then
            function _vim_sync_PWD() {
                printf '\033]51;["call", "Tapi_lcd", "%q"]\007' "$PWD"

Or, for zsh:
        if [[ -n "$VIM_TERMINAL" ]]; then
            autoload -Uz add-zsh-hook
            add-zsh-hook -Uz chpwd _vim_sync_PWD
            function _vim_sync_PWD() {
                printf '\033]51;["call", "Tapi_lcd", "%q"]\007' "$PWD"

Or, for fish:
        if test -n "$VIM_TERMINAL"
            function _vim_sync_PWD --on-variable=PWD
                printf '\033]51;["call", "Tapi_lcd", "%s"]\007' "$PWD"

Using the client-server feature
This only works when v:servername is not empty.  If needed you can set it,
before opening the terminal, with:
        call remote_startserver('vim-server')

$VIM_SERVERNAME is set in the terminal to pass on the server name.

In the job you can then do something like:
        vim --servername $VIM_SERVERNAME --remote +123 some_file.c
This will open the file "some_file.c" and put the cursor on line 123.

4. Remote testing                                       terminal-testing

Most Vim tests execute a script inside Vim.  For some tests this does not
work, running the test interferes with the code being tested.  To avoid this
Vim is executed in a terminal window.  The test sends keystrokes to it and
inspects the resulting screen state.


term_sendkeys()       send keystrokes to a terminal (not subject to tmap)
term_wait()           wait for screen to be updated
term_scrape()         inspect terminal screen

5. Diffing screen dumps                                 terminal-diff

In some cases it can be bothersome to test that Vim displays the right
characters on the screen.  E.g. with syntax highlighting.  To make this
simpler it is possible to take a screen dump of a terminal and compare it to
an expected screen dump.

Vim uses the window size, text, color and other attributes as displayed.  The
Vim screen size, font and other properties do not matter.  Therefore this
mechanism is portable across systems.  A conventional screenshot would reflect
all differences, including font size and family.

Writing a screen dump test for Vim
For an example see the Test_syntax_c() function in
src/testdir/test_syntax.vim.  The main parts are:
- Write a file you want to test with. This is useful for testing syntax
  highlighting.  You can also start Vim with an empty buffer.
- Run Vim in a terminal with a specific size.  The default is 20 lines of 75
  characters.  This makes sure the dump is always this size.  The function
  RunVimInTerminal() takes care of this.  Pass it the arguments for the Vim
- Send any commands to Vim using term_sendkeys().  For example:
        call term_sendkeys(buf, ":echo &lines &columns\<CR>")
- Check that the screen is now in the expected state, using
  VerifyScreenDump().  This expects the reference screen dump to be in the
  src/testdir/dumps/ directory.  Pass the name without ".dump".  It is
  recommended to use the name of the test function and a sequence number, so
  that we know what test is using the file.
- Repeat sending commands and checking the state.
- Finally stop Vim by calling StopVimInTerminal().

The first time you do this you won't have a screen dump yet.  Create an empty
file for now, e.g.:
        touch src/testdir/dumps/Test_function_name_01.dump

The test will then fail, giving you the command to compare the reference dump
and the failed dump, e.g.:
        call term_dumpdiff("failed/Test_func.dump", "dumps/Test_func.dump")

Use this command in Vim, with the current directory set to src/testdir.
Once you are satisfied with the test, move the failed dump in place of the
        :!mv failed/Test_func.dump dumps/Test_func.dump

Creating a screen dump
To create the screen dump, run Vim (or any other program) in a terminal and
make it show the desired state.  Then use the term_dumpwrite() function to
create a screen dump file.  For example:
        :call term_dumpwrite(77, "mysyntax.dump")

Here "77" is the buffer number of the terminal.  Use :ls! to see it.

You can view the screen dump with term_dumpload():
        :call term_dumpload("mysyntax.dump")

To verify that Vim still shows exactly the same screen, run Vim again with
exactly the same way to show the desired state.  Then create a screen dump
again, using a different file name:
        :call term_dumpwrite(88, "test.dump")

To assert that the files are exactly the same use assert_equalfile():
        call assert_equalfile("mysyntax.dump", "test.dump")

If there are differences then v:errors will contain the error message.

Comparing screen dumps
assert_equalfile() does not make it easy to see what is different.
To spot the problem use term_dumpdiff():
        call term_dumpdiff("mysyntax.dump", "test.dump")

This will open a window consisting of three parts:
1.  The contents of the first dump
2.  The difference between the first and second dump
3.  The contents of the second dump

You can usually see what differs in the second part.  Use the 'ruler' to
relate it to the position in the first or second dump.  Letters indicate the
kind of difference:
        X       different character
        >       cursor in first but not in second
        <       cursor in second but not in first
        w       character width differs (single vs double width)
        f       foreground color differs
        b       background color differs
        a       attribute differs (bold, underline, reverse, etc.)
        ?       character missing in both
        +       character missing in first
        -       character missing in second

Alternatively, press "s" to swap the first and second dump. Do this several
times so that you can spot the difference in the context of the text.

6. Debugging                            terminal-debug terminal-debugger

The Terminal debugging plugin can be used to debug a program with gdb and view
the source code in a Vim window.  Since this is completely contained inside
Vim this also works remotely over an ssh connection.

When the +terminal feature is missing, the plugin will use the "prompt"
buffer type, if possible.  The running program will then use a newly opened
terminal window.  See termdebug-prompt below for details.

Load the plugin with this command:
        packadd termdebug
To start debugging use :Termdebug or :TermdebugCommand followed by the
command name, for example:
        :Termdebug vim

This opens two windows:

gdb window      A terminal window in which "gdb vim" is executed.  Here you
                can directly interact with gdb.  The buffer name is "!gdb".

program window  A terminal window for the executed program.  When "run" is
                used in gdb the program I/O will happen in this window, so
                that it does not interfere with controlling gdb.  The buffer
                name is "debugged program".

The current window is used to show the source code.  When gdb pauses the
source file location will be displayed, if possible.  A sign is used to
highlight the current position, using highlight group debugPC.

If the buffer in the current window is modified, another window will be opened
to display the current gdb position.  You can use :Winbar to add a window
toolbar there.

Focus the terminal of the executed program to interact with it.  This works
the same as any command running in a terminal window.

When the debugger ends, typically by typing "quit" in the gdb window, the two
opened windows are closed.

Only one debugger can be active at a time.

Depending on how gdb is launched, termdebug startup time may vary.
To avoid termdebug to get stuck if the startup process of gdb takes too long,
a configurable timeout is included. Such time out is configurable in terms of
multiple of 10ms:
    let g:termdebug_config['timeout'] = 500 # 500 * 10ms = 5 seconds.

The default timeout is 3000 ms.
If you want to give specific commands to the command being debugged, you can
use the :TermdebugCommand command followed by the command name and
additional parameters.
        :TermdebugCommand vim --clean -c ':set nu'

Both the :Termdebug and :TermdebugCommand support an optional "!" bang
argument to start the command right away, without pausing at the gdb window
(and cursor will be in the debugged window).  For example:
        :TermdebugCommand! vim --clean

To attach gdb to an already running executable or use a core file, pass extra
arguments.  E.g.:
        :Termdebug vim core
        :Termdebug vim 98343

If no argument is given, you'll end up in a gdb window, in which you need to
specify which command to run using e.g. the gdb file command.

Example session
Start in the Vim "src" directory and build Vim:
        % make
Make sure that debug symbols are present, usually that means that $CFLAGS
includes "-g".

Start Vim:
        % ./vim

Load the termdebug plugin and start debugging Vim:
        :packadd termdebug
        :Termdebug vim
You should now have three windows:
    source  - where you started, has a window toolbar with buttons
    gdb     - you can type gdb commands here
    program - the executed program will use this window

You can use CTRL-W CTRL-W or the mouse to move focus between windows.
Put focus on the gdb window and type:
        break ex_help
Vim will start running in the program window. Put focus there and type:
        :help gui
Gdb will run into the ex_help breakpoint.  The source window now shows the
ex_cmds.c file.  A red "1 " marker will appear in the signcolumn where the
breakpoint was set.  The line where the debugger stopped is highlighted.  You
can now step through the program.  Let's use the mouse: click on the "Next"
button in the window toolbar.  You will see the highlighting move as the
debugger executes a line of source code.

Click "Next" a few times until the for loop is highlighted.  Put the cursor on
the end of "eap->arg", then click "Eval" in the toolbar.  You will see this
        "eap->arg": 0x555555e68855 "gui"
This way you can inspect the value of local variables.  You can also focus the
gdb window and use a "print" command, e.g.:
        print *eap
If mouse pointer movements are working, Vim will also show a balloon when the
mouse rests on text that can be evaluated by gdb.

Now go back to the source window and put the cursor on the first line after
the for loop, then type:
You will see a ">>" marker appear, this indicates the new breakpoint.  Now
click "Cont" in the toolbar and the code until the breakpoint will be

You can type more advanced commands in the gdb window.  For example, type:
        watch curbuf
Now click "Cont" in the toolbar (or type "cont" in the gdb window). Execution
will now continue until the value of "curbuf" changes, which is in do_ecmd().
To remove this watchpoint again type in the gdb window:
        delete 3

You can see the stack by typing in the gdb window:
Move through the stack frames, e.g. with:
        frame 3
The source window will show the code, at the point where the call was made to
a deeper level.

Stepping through code
Put focus on the gdb window to type commands there.  Some common ones are:
CTRL-C        interrupt the program
- next          execute the current line and stop at the next line
- step          execute the current line and stop at the next statement,
                entering functions
- until         execute until past the current cursor line or past a specified
                position or the current stack frame returns
- finish        execute until leaving the current function
- where         show the stack
- frame N       go to the Nth stack frame
- continue      continue execution

                                                :Run :Arguments
In the window showing the source code these commands can be used to control
 :Run [args]      run the program with [args] or the previous arguments
 :Arguments {args}  set arguments for the next :Run

 :Break       set a breakpoint at the cursor position
 :Break {position}
                set a breakpoint at the specified position
 :Tbreak      set a temporary breakpoint at the cursor position
 :Tbreak {position}
                set a temporary breakpoint at the specified position
 :Clear       delete the breakpoint at the cursor position

 :Step        execute the gdb "step" command
 :Over        execute the gdb "next" command (:Next is a Vim command)
 :Until       execute the gdb "until" command
 :Finish      execute the gdb "finish" command
 :Continue    execute the gdb "continue" command
 :Stop        interrupt the program

If 'mouse' is set the plugin adds a window toolbar with these entries:
  Step          :Step
  Next          :Over
  Finish        :Finish
  Cont          :Continue
  Stop          :Stop
  Eval          :Evaluate
This way you can use the mouse to perform the most common commands.  You need
to have the 'mouse' option set to enable mouse clicks.
See termdebug_winbar for configuring this toolbar.
You can add the window toolbar in other windows you open with:

If gdb stops at a source line and there is no window currently showing the
source code, a new window will be created for the source code.  This also
happens if the buffer in the source code window has been modified and can't be

Gdb gives each breakpoint a number.  In Vim the number shows up in the sign
column, with a red background.  You can use these gdb commands:
- info break    list breakpoints
- delete N      delete breakpoint N
You can also use the :Clear command if the cursor is in the line with the
breakpoint, or use the "Clear breakpoint" right-click menu entry.

Inspecting variables
                                        termdebug-variables :Evaluate
 :Evaluate        evaluate the expression under the cursor
 K                same (see termdebug_map_K to disable)
 :Evaluate {expr}   evaluate {expr}
 :'<,'>Evaluate     evaluate the Visually selected text

This is similar to using "print" in the gdb window.
You can usually shorten :Evaluate to :Ev.

Navigating stack frames
                                termdebug-frames :Frame :Up :Down
 :Frame [frame]       select frame [frame], which is a frame number,
                        address, or function name (default: current frame)
 :Up [count]          go up [count] frames (default: 1; the frame that
                        called the current)
 +                    same (see termdebug_map_plus to disable)
 :Down [count]        go down [count] frames (default: 1; the frame called
                        by the current)
 -                    same (see termdebug_map_minus to disable)

Other commands
 :Gdb      jump to the gdb window
 :Program    jump to the window with the running program
 :Source     jump to the window with the source code, create it if there
             isn't one
 :Asm      jump to the window with the disassembly, create it if there
             isn't one
 :Var      jump to the window with the local and argument variables,
             create it if there isn't one. This window updates whenever the
             program is stopped

Four autocommands can be used:
        au User TermdebugStartPre  echomsg 'debugging starting'
        au User TermdebugStartPost echomsg 'debugging started'
        au User TermdebugStopPre   echomsg 'debugging stopping'
        au User TermdebugStopPost  echomsg 'debugging stopped'

TermdebugStartPre               Before starting debugging.
                                Not triggered if the debugger is already
                                running or the debugger command cannot be
TermdebugStartPost              After debugging has initialized.
                                If a "!" bang is passed to :Termdebug or
                                :TermdebugCommand the event is triggered
                                before running the provided command in gdb.
TermdebugStopPre                Before debugging ends, when gdb is terminated,
                                most likely after issuing a "quit" command in
                                the gdb window.
TermdebugStopPost               After debugging has ended, gdb-related windows
                                are closed, debug buffers wiped out and
                                the state before the debugging was restored.

                                termdebug-customizing g:termdebug_config
In the past several global variables were used for configuration.  These are
deprecated and using the g:termdebug_config dictionary is preferred.  When
g:termdebug_config exists the other global variables will NOT be used.
The recommended way is to start with an empty dictionary:
        let g:termdebug_config = {}

Then you can add entries to the dictionary as mentioned below.  The
deprecated global variable names are mentioned for completeness.  If you are
switching over to using g:termdebug_config you can find the old variable name
and take over the value, then delete the deprecated variable.

Prompt mode
When the +terminal feature is not supported and on MS-Windows, gdb will run
in a buffer with 'buftype' set to "prompt".  This works slightly differently:
- The gdb window will be in Insert mode while typing commands.  Go to Normal
  mode with <Esc>, then you can move around in the buffer, copy/paste, etc.
  Go back to editing the gdb command with any command that starts Insert mode,
  such as a or i.
- The program being debugged will run in a separate window.  On MS-Windows
  this is a new console window.  On Unix, if the +terminal feature is
  available a Terminal window will be opened to run the debugged program in.

Prompt mode can be used even when the +terminal feature is present with:
        let g:termdebug_config['use_prompt'] = 1
If there is no g:termdebug_config you can use:
        let g:termdebug_use_prompt = 1

The termdebug plugin enables a few default mappings.  All those mappings
are reset to their original values once the termdebug session concludes.

                                        termdebug_map_K termdebug-mappings
The K key is normally mapped to :Evaluate unless a buffer local (:map-local)
mapping to K already exists.  If you do not want this use:
        let g:termdebug_config['map_K'] = 0
If there is no g:termdebug_config you can use:
        let g:termdebug_map_K = 0

The - key is normally mapped to :Down unless a buffer local mapping to the -
key already exists.  If you do not want this use:
        let g:termdebug_config['map_minus'] = 0

The + key is normally mapped to :Up unless a buffer local mapping to the +
key already exists.  If you do not want this use:
        let g:termdebug_config['map_plus'] = 0

If you want the Asm window shown by default, set the "disasm_window" flag to
1.  The "disasm_window_height" entry can be used to set the window height:
        let g:termdebug_config['disasm_window'] = 1
        let g:termdebug_config['disasm_window_height'] = 15
If there is no g:termdebug_config you can use:
        let g:termdebug_disasm_window = 15
Any value greater than 1 will set the Asm window height to that value.
If the current window has enough horizontal space, it will be vertically split
and the Asm window will be shown side by side with the source code window (and
the height option won't be used).

If you want the Var window shown by default, set the "variables_window" flag
to 1.  The "variables_window_height" entry can be used to set the window
        let g:termdebug_config['variables_window'] = 1
        let g:termdebug_config['variables_window_height'] = 15
If there is no g:termdebug_config you can use:
        let g:termdebug_variables_window = 15
Any value greater than 1 will set the Var window height to that value.
If the current window has enough horizontal space, it will be vertically split
and the Var window will be shown side by side with the source code window (and
the height options won't be used).

There is another, hidden, buffer, which is used for Vim to communicate with
gdb.  The buffer name is "gdb communication".  Do not delete this buffer, it
will break the debugger.

Gdb has some weird behavior, the plugin does its best to work around that.
For example, after typing "continue" in the gdb window a CTRL-C can be used to
interrupt the running program.  But after using the MI command
"-exec-continue"  pressing CTRL-C does not interrupt.  Therefore you will see
"continue" being used for the :Continue command, instead of using the
communication channel.

GDB command
To change the name of the gdb command, set "debugger" entry in
g:termdebug_config or the "g:termdebugger" variable before invoking
        let g:termdebug_config['command'] = "mygdb"
If there is no g:termdebug_config you can use:
        let g:termdebugger = "mygdb"

If the command needs an argument use a List:
        let g:termdebug_config['command'] = ['rr', 'replay', '--']
If there is no g:termdebug_config you can use:
        let g:termdebugger = ['rr', 'replay', '--']

Several arguments will be added to make gdb work well for the debugger.
If you want to modify them, add a function to filter the argument list:
        let g:termdebug_config['command_filter'] = MyDebugFilter

If you do not want the arguments to be added, but you do need to set the
"pty", use a function to add the necessary arguments:
        let g:termdebug_config['command_add_args'] = MyAddArguments
The function will be called with the list of arguments so far, and a second
argument that is the name of the pty.
Only debuggers fully compatible with gdb will work.  Vim uses the GDB/MI
interface.  The "new-ui" command requires gdb version 7.12 or later.  If you
get this error:
        Undefined command: "new-ui". Try "help".
Then your gdb is too old.

                                        hl-debugPC hl-debugBreakpoint
The color of the signs can be adjusted with these highlight groups:
- debugPC               the current position
- debugBreakpoint       a breakpoint

The defaults are, when 'background' is "light":
  hi debugPC term=reverse ctermbg=lightblue guibg=lightblue
  hi debugBreakpoint term=reverse ctermbg=red guibg=red

When 'background' is "dark":
  hi debugPC term=reverse ctermbg=darkblue guibg=darkblue
  hi debugBreakpoint term=reverse ctermbg=red guibg=red

You can define your own shortcuts (mappings) to control gdb, that can work in
any window, using the TermDebugSendCommand() function.  Example:
        map ,w :call TermDebugSendCommand('where')<CR>
The argument is the gdb command.

Popup menu
By default the Termdebug plugin sets 'mousemodel' to "popup_setpos" and adds
these entries to the popup menu:
        Set breakpoint          :Break
        Clear breakpoint        :Clear
        Evaluate                :Evaluate
If you don't want this then disable it with:
        let g:termdebug_config['popup'] = 0
If there is no g:termdebug_config you can use:
        let g:termdebug_popup = 0

Change default signs
Termdebug uses the hex number of the breakpoint ID in the signcolumn to
represent breakpoints. if it is greater than "0xFF", then it will be displayed
as "F+", due to we really only have two screen cells for the sign.

If you want to customize the breakpoint signs:
        let g:termdebug_config['sign'] = '>>'
If there is no g:terminal_config yet you can use:
        let g:termdebug_config = {'sign': '>>'}

After this, breakpoints will be displayed as >> in the signcolumn.

Window toolbar
By default the Termdebug plugin creates a window toolbar if the mouse is
enabled (see :Winbar).  If you don't want this then disable it with:
        let g:termdebug_config['winbar'] = 0

Vim window width
To change the width of the Vim window when debugging starts and use a vertical
        let g:termdebug_config['wide'] = 163
If there is no g:termdebug_config you can use:
        let g:termdebug_wide = 163

This will set 'columns' to 163 when :Termdebug is used.  The value is
restored when quitting the debugger.

If the wide value is set and 'columns' is already a greater value, then a
vertical split will be used without modifying 'columns'.

Set the wide value to 1 to use a vertical split without ever changing
'columns'.  This is useful when the terminal can't be resized by Vim.