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textprop - Vim Documentation

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textprop.txt  For Vim version 8.1.  Last change: 2019 Nov 12


                  VIM REFERENCE MANUAL    by Bram Moolenaar


Displaying text with properties attached.       textprop text-properties


1. Introduction                 text-prop-intro
2. Functions                    text-prop-functions
3. When text changes            text-prop-changes


{not able to use text properties when the +textprop feature was
disabled at compile time}

==============================================================================
1. Introduction                                         text-prop-intro

Text properties can be attached to text in a buffer.  They will move with the
text: If lines are deleted or inserted the properties move with the text they
are attached to.  Also when inserting/deleting text in the line before the
text property.  And when inserting/deleting text inside the text property, it
will increase/decrease in size.

The main use for text properties is to highlight text.  This can be seen as a
replacement for syntax highlighting.  Instead of defining patterns to match
the text, the highlighting is set by a script, possibly using the output of an
external parser.  This only needs to be done once, not every time when
redrawing the screen, thus can be much faster, after the initial cost of
attaching the text properties.

Text properties can also be used for other purposes to identify text.  For
example, add a text property on a function name, so that a search can be
defined to jump to the next/previous function.

A text property is attached at a specific line and column, and has a specified
length.  The property can span multiple lines.

A text property has these fields:
        "id"            a number to be used as desired
        "type"          the name of a property type


Property Types
                                                        E971
A text property normally has the name of a property type, which defines 
how to highlight the text.  The property type can have these entries:
        "highlight"     name of the highlight group to use
        "combine"       when omitted or TRUE the text property highlighting is
                        combined with any syntax highlighting; when FALSE the
                        text property highlighting replaces the syntax
                        highlighting
        "priority"      when properties overlap, the one with the highest
                        priority will be used.
        "start_incl"    when TRUE inserts at the start position will be
                        included in the text property
        "end_incl"      when TRUE inserts at the end position will be
                        included in the text property


Example

Suppose line 11 in a buffer has this text (excluding the indent):

        The number 123 is smaller than 4567.

To highlight the numbers in this text:
        call prop_type_add('number', {'highlight': 'Constant'})
        call prop_add(11, 12, {'length': 3, 'type': 'number'})
        call prop_add(11, 32, {'length': 4, 'type': 'number'})

Try inserting or deleting lines above the text, you will see that the text
properties stick to the text, thus the line number is adjusted as needed.

Setting "start_incl" and "end_incl" is useful when white space surrounds the
text, e.g. for a function name.  Using false is useful when the text starts
and/or ends with a specific character, such as the quote surrounding a string.

        func FuncName(arg)
             ^^^^^^^^        property with start_incl and end_incl set

        var = "text";
              ^^^^^^         property with start_incl and end_incl not set

Nevertheless, when text is inserted or deleted the text may need to be parsed
and the text properties updated.  But this can be done asynchronously.


Internal error E967

If you see E967, please report the bug.  You can do this at Github:
https://github.com/vim/vim/issues/new

==============================================================================
2. Functions                                            text-prop-functions

Manipulating text property types:

prop_type_add({name}{props})          define a new property type
prop_type_change({name}{props})       change an existing property type
prop_type_delete({name} [, {props}])    delete a property type
prop_type_get([{name} [, {props}])      get property type values
prop_type_list([{props}])               get list of property types


Manipulating text properties:

prop_add({lnum}{col}{props})        add a text property
prop_clear({lnum} [, {lnum-end} [, {bufnr}]])
                                        remove all text properties
prop_find({props} [, {direction}])      search for a text property
prop_list({lnum} [, {props})            text properties in {lnum}
prop_remove({props} [, {lnum} [, {lnum-end}]])
                                        remove a text property

                                                prop_add() E965
prop_add({lnum}{col}{props})
                Attach a text property at position {lnum}{col}.  {col} is
                counted in bytes, use one for the first column.
                If {lnum} is invalid an error is given. E966
                If {col} is invalid an error is given. E964

                {props} is a dictionary with these fields:
                   length       length of text in bytes, can only be used
                                for a property that does not continue in
                                another line; can be zero
                   end_lnum     line number for the end of text
                   end_col      column just after the text; not used when
                                "length" is present; when {col} and "end_col"
                                are equal, and "end_lnum" is omitted or equal
                                to {lnum}, this is a zero-width text property
                   bufnr        buffer to add the property to; when omitted
                                the current buffer is used
                   id           user defined ID for the property; when omitted
                                zero is used
                   type         name of the text property type
                All fields except "type" are optional.

                It is an error when both "length" and "end_lnum" or "end_col"
                are given.  Either use "length" or "end_col" for a property
                within one line, or use "end_lnum" and "end_col" for a
                property that spans more than one line.
                When neither "length" nor "end_col" are given the property
                will be zero-width.  That means it will not be highlighted but
                will move with the text, as a kind of mark.
                The property can end exactly at the last character of the
                text, or just after it.  In the last case, if text is appended
                to the line, the text property size will increase, also when
                the property type does not have "end_incl" set.

                "type" will first be looked up in the buffer the property is
                added to. When not found, the global property types are used.
                If not found an error is given.

                See text-properties for information about text properties.

                Can also be used as a method:
                        GetLnum()->prop_add(col, props)


prop_clear({lnum} [, {lnum-end} [, {props}]])           prop_clear()
                Remove all text properties from line {lnum}.
                When {lnum-end} is given, remove all text properties from line
                {lnum} to {lnum-end} (inclusive).

                When {props} contains a "bufnr" item use this buffer,
                otherwise use the current buffer.

                See text-properties for information about text properties.

                Can also be used as a method:
                        GetLnum()->prop_clear()

                                                        prop_find()
prop_find({props} [, {direction}])
                {not implemented yet}
                Search for a text property as specified with {props}:
                   id           property with this ID
                   type         property with this type name
                   bufnr        buffer to search in; when present a
                                start position with "lnum" and "col"
                                must be given; when omitted the
                                current buffer is used
                   lnum         start in this line (when omitted start
                                at the cursor)
                   col          start at this column (when omitted
                                and "lnum" is given: use column 1,
                                otherwise start at the cursor)
                   skipstart    do not look for a match at the start
                                position

                {direction} can be "f" for forward and "b" for backward.  When
                omitted forward search is performed.

                If a match is found then a Dict is returned with the entries
                as with prop_list(), and additionally an "lnum" entry.
                If no match is found then an empty Dict is returned.

                See text-properties for information about text properties.


prop_list({lnum} [, {props}])                           prop_list()
                Return a List with all text properties in line {lnum}.

                When {props} contains a "bufnr" item, use this buffer instead
                of the current buffer.

                The properties are ordered by starting column and priority.
                Each property is a Dict with these entries:
                   col          starting column
                   length       length in bytes, one more if line break is
                                included
                   id           property ID
                   type         name of the property type, omitted if
                                the type was deleted
                   start        when TRUE property starts in this line
                   end          when TRUE property ends in this line

                When "start" is zero the property started in a previous line,
                the current one is a continuation.
                When "end" is zero the property continues in the next line.
                The line break after this line is included.

                See text-properties for information about text properties.

                Can also be used as a method:
                        GetLnum()->prop_list()

                                                prop_remove() E968
prop_remove({props} [, {lnum} [, {lnum-end}]])
                Remove a matching text property from line {lnum}.  When
                {lnum-end} is given, remove matching text properties from line
                {lnum} to {lnum-end} (inclusive).
                When {lnum} is omitted remove matching text properties from
                all lines.

                {props} is a dictionary with these fields:
                   id           remove text properties with this ID
                   type         remove text properties with this type name
                   bufnr        use this buffer instead of the current one
                   all          when TRUE remove all matching text properties,
                                not just the first one
                A property matches when either "id" or "type" matches.
                If buffer "bufnr" does not exist you get an error message.
                If buffer "bufnr" is not loaded then nothing happens.

                Returns the number of properties that were removed.

                See text-properties for information about text properties.

                Can also be used as a method:
                        GetProps()->prop_remove()


prop_type_add({name}{props})          prop_type_add() E969 E970
                Add a text property type {name}.  If a property type with this
                name already exists an error is given.  Nothing is returned.
                {props} is a dictionary with these optional fields:
                   bufnr        define the property only for this buffer; this
                                avoids name collisions and automatically
                                clears the property types when the buffer is
                                deleted.
                   highlight    name of highlight group to use
                   priority     when a character has multiple text
                                properties the one with the highest priority
                                will be used; negative values can be used, the
                                default priority is zero
                   combine      when TRUE combine the highlight with any
                                syntax highlight; when omitted or FALSE syntax
                                highlight will not be used
                   start_incl   when TRUE inserts at the start position will
                                be included in the text property
                   end_incl     when TRUE inserts at the end position will be
                                included in the text property

                See text-properties for information about text properties.

                Can also be used as a method:
                        GetPropName()->prop_type_add(props)

prop_type_change({name}{props})                       prop_type_change()
                Change properties of an existing text property type.  If a
                property with this name does not exist an error is given.
                The {props} argument is just like prop_type_add().

                See text-properties for information about text properties.

                Can also be used as a method:
                        GetPropName()->prop_type_change(props)

prop_type_delete({name} [, {props}])                    prop_type_delete()
                Remove the text property type {name}.  When text properties
                using the type {name} are still in place, they will not have
                an effect and can no longer be removed by name.

                {props} can contain a "bufnr" item.  When it is given, delete
                a property type from this buffer instead of from the global
                property types.

                When text property type {name} is not found there is no error.

                See text-properties for information about text properties.

                Can also be used as a method:
                        GetPropName()->prop_type_delete()

prop_type_get([{name} [, {props}])                      prop_type_get()
                Returns the properties of property type {name}.  This is a
                dictionary with the same fields as was given to
                prop_type_add().
                When the property type {name} does not exist, an empty
                dictionary is returned.

                {props} can contain a "bufnr" item.  When it is given, use
                this buffer instead of the global property types.

                See text-properties for information about text properties.

                Can also be used as a method:
                        GetPropName()->prop_type_get()

prop_type_list([{props}])                               prop_type_list()
                Returns a list with all property type names.

                {props} can contain a "bufnr" item.  When it is given, use
                this buffer instead of the global property types.

                See text-properties for information about text properties.


==============================================================================
3. When text changes                            text-prop-changes

Vim will do its best to keep the text properties on the text where it was
attached.  When inserting or deleting text the properties after the change
will move accordingly.

When text is deleted and a text property no longer includes any text, it is
deleted.  However, a text property that was defined as zero-width will remain,
unless the whole line is deleted.
                                                                E275
When a buffer is unloaded, all the text properties are gone.  There is no way
to store the properties in a file.  You can only re-create them.  When a
buffer is hidden the text is preserved and so are the text properties.  It is
not possible to add text properties to an unloaded buffer.

When using replace mode, the text properties stay on the same character
positions, even though the characters themselves change.

To update text properties after the text was changed, install a callback with
listener_add().  E.g, if your plugin does spell checking, you can have the
callback update spelling mistakes in the changed text.  Vim will move the
properties below the changed text, so that they still highlight the same text,
thus you don't need to update these.


Text property columns are not updated:

- When setting the line with setline() or through an interface, such as Lua,
  Tcl or Python.  Vim does not know what text got inserted or deleted.


 vim:tw=78:ts=8:noet:ft=help:norl: