kakoune/doc/manpages/highlighters.asciidoc

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KAKOUNE(1)
==========
NAME
----
highlighters - a
Description
-----------
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Manipulation of the displayed text is done through highlighters, which can
be added or removed with the following commands:
-------------------------------------------------------
addhl <highlighter_name> <highlighter_parameters> ...
-------------------------------------------------------
and
-----------------------
rmhl <highlighter_id>
-----------------------
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*highlighter_id* is a name generated by the highlighter specified with
*highlighter_name*, possibly dependent on the parameters. Use command
completion in a prompt on the *rmhl* command to see the existing highlighters
ids.
General highlighters
--------------------
*regex* <ex> <capture_id>:<face> ...::
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highlight a regex, takes the regex as first parameter, followed by
any number of face parameters. For example:
-----------------------------------------------------
addhl regex //(\hTODO:)?[^\n] 0:cyan 1:yellow,red
-----------------------------------------------------
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will highlight C++ style comments in cyan, with an eventual 'TODO:'
in yellow on red background
*dynregex*::
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Similar to regex, but expand (like a command paramater would) the
given expression before building a regex from the result
*flag_lines* <flag> <option_name>::
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add a column in front of text, and display the given flag in it for
everly line contained in the int-list option named <option_name>
*show_matching*::
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highlight matching char of the character under the selections cursor
using MatchingChar face
*number_lines* [options]::
show line numbers, with the following *options*:
*-relative*:::
show line numbers relative to the main cursor line
*-hlcursor*:::
highlight the cursor line with a separate face
*-separator* <separator text>:::
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specify a string to separate the line numbers column with
the rest of the buffer (default is '|')
*fill* <face>::
fill using the given *face*, mostly useful with regions highlighters
Highlighting Groups
-------------------
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The group highlighter is a container for other highlighters. You can add a
group to the current window using
--------------------
addhl group <name>
--------------------
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The *-group* switch of the *addhl* command provides a mean to add highlighters
inside this group:
----------------------------------------
addhl -group <name> <type> <params>...
----------------------------------------
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Groups can contain other groups, the *-group* switch can be used to define
a path as follows:
--------------------------------------------------
addhl -group <name> group <subname>
addhl -group <name>/<subname> <type> <params>...
--------------------------------------------------
Regions highlighters
--------------------
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A special highlighter provides a way to segment the buffer into regions,
which are to be highlighted differently.
*name*::
user defined, used to identify the region
*opening*::
regex that defines the region start text
*closing*::
regex that defines the region end text
*recurse*::
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regex that defines the text that matches recursively an end token
into the region
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The *recurse* option is useful for regions that can be nested, for example
the following contruct:
----------
%sh{ ... }
----------
accepts nested braces scopes ('{ ... }') so the following string is valid:
----------------------
%sh{ ... { ... } ... }
----------------------
This region can be defined with:
------------------------
shell_expand %sh\{ \} \{
------------------------
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Regions are used in the regions highlighter which can take any number
of regions.
The following command:
-----------------------------------------------------------------------
addhl regions <name> <region_name1> <opening1> <closing1> <recurse1>
<region_name2> <opening2> <closing2> <recurse2>...
-----------------------------------------------------------------------
defines multiple regions in which other highlighters can be added as follows:
---------------------------------------
addhl -group <name>/<region_name> ...
---------------------------------------
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Regions are matched using the left-most rule: the left-most region opening
starts a new region. When a region closes, the closest next opening start
another region.
That matches the rule governing most programming language parsing.
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Regions also supports a *-default <default_region>* switch to define the
default region, when no other region matches the current buffer range.
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Most programming languages can then be properly highlighted using a regions
highlighter as root:
-----------------------------------------------------------------
addhl regions -default code <lang> \
string <str_opening> <str_closing> <str_recurse> \
comment <comment_opening> <comment_closing> <comment_recurse>
addhl -group <lang>/code ...
addhl -group <lang>/string ...
addhl -group <lang>/comment ...
-----------------------------------------------------------------
Shared Highlighters
-------------------
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Highlighters are often defined for a specific filetype, and it makes then
sense to share the highlighters between all the windows on the same filetypes.
A shared highlighter can be defined with the following command:
--------------------------------
addhl -group /<group_name> ...
--------------------------------
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When the group switch values starts with a '/', it references a group in
the shared highlighters, rather than the window highlighters.
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The common case would be to create a named shared group, and then fill it
with highlighters:
------------------------------
addhl -group / group <name>
addhl -group /name regex ...
------------------------------
It can then be referenced in a window using the ref highlighter.
------------------
addhl ref <name>
------------------
The ref can reference any named highlighter in the shared namespace.