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update the readme for highlighters doc
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Maxime Coste
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README.asciidoc
137
README.asciidoc
@ -582,14 +582,8 @@ and
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:rmhl <highlighter_id>
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----------------------
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existing highlighters are:
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general highlighters are:
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* +number_lines+: show line numbers
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* +group <group_name>+: highlighter group, containing other highlighters.
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useful when multiple highlighters work together and need to be
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removed as one. Adding and removing from a group can be done using
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`:addhl -group <group> <highlighter_name> <highlighter_parameters...>`
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`:rmhl -group <group> <highlighter_name>`
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* +regex <ex> <color>...+: highlight a regex, takes the regex as first parameter,
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followed by any number of color parameters. color format is:
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<capture_id>:<fg_color>[,<bg_color>]
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@ -603,6 +597,98 @@ existing highlighters are:
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<option_name>.
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* +show_matching+: highlight matching char of the character under the selections
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cursor using +MatchingChar+ color alias.
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* +number_lines+: show line numbers
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* +fill <color>+: fill with given color, mostly useful with region highlighters
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(see below)
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Highlighting Groups
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~~~~~~~~~~~~~~~~~~~
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the +group+ highlighter is a container for other highlighters. You can add
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a group to the current window using
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------------------
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addhl group <name>
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------------------
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and then the +-group+ switch of +addhl+ provides a mean to add highlighters
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inside this group.
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--------------------------------------
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addhl -group <name> <type> <params>...
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--------------------------------------
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groups can contain other groups, the +-group+ switch can be used to define a path.
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------------------------------------------------
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addhl -group <name> group <subname>
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addhl -group <name>/<subname> <type> <params>...
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------------------------------------------------
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Region highlighters
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~~~~~~~~~~~~~~~~~~~
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The +region+ highlighters takes 3 to 4 parameters:
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---------------------------------------------------
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addhl region <name> <opening> <closing> [<recurse>]
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---------------------------------------------------
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+name+ is user defined, but +opening+, +closing+ and +recurse+ are regexes.
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* +opening+ defines the region start text
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* +closing+ defines the region end text
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* +recurse+ defines the text that matches recursively an end token into the region.
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+recurse+ is useful for regions that can be nested, for example the +%sh{ ... }+
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construct in kakoune accept nested +{ ... }+ so +%sh{ ... { ... } ... }+ is valid.
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this region can be defined with:
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-------------------------------------
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addhl region shell_expand %sh\{ \} \{
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-------------------------------------
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It then provides a group named +content+ which can be filled with other highlighters
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that will only be applied on the given regions.
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-------------------------------------
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addhl -group shell_expand/content ...
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-------------------------------------
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The +multi_region+ highlighter is even more powerfull, it can segment the buffer
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in non overlapping regions.
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-------------------------------------------------------------------------
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addhl multi_region <name> <region_name1> <opening1> <closing1> <recurse1> \
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<region_name2> <opening2> <closing2> <recurse2>...
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-------------------------------------------------------------------------
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defines multiple regions in which other highlighters can be added
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-------------------------------------
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addhl -group <name>/<region_name> ...
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-------------------------------------
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Regions are matched using the left-most rule: the left-most region opening starts
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a new region. when a region closes, the closest next opening start another region.
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That matches the rule governing most programming language parsing.
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+multi_region+ also supports a +-default <default_region>+ switch to define the
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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 +multi_region+
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highlighter as root:
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-----------------------------------------------------------------
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addhl multi_region -default code <lang> \
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string <str_opening> <str_closing> <str_recurse> \
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comment <comment_opening> <comment_closing> <comment_recurse>
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addhl -group <lang>/code ...
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addhl -group <lang>/string ...
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addhl -group <lang>/comment ...
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-----------------------------------------------------------------
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Shared Highlighters
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~~~~~~~~~~~~~~~~~~~
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@ -610,20 +696,30 @@ Shared Highlighters
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Highlighters are often defined for a specific filetype, and it makes then sense to
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share the highlighters between all the windows on the same filetypes.
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A shared highlighter can be defined with
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A shared highlighter can be defined with the +:addhl+ command
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-----------------------
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defhl <shared_hl_name>
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-----------------------
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------------------------------
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addhl -group /<group_name> ...
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------------------------------
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Highlighters can be added to it using the regular +:addhl+ command, with the
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+-def-group <shared_hl_name>+ option.
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when the group switch values starts with a '/', it references a group in the
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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
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with highlighters:
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---------------------------
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addhl -group / group <name>
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addhl -group /name regex ...
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---------------------------
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It can then be referenced in a window using the +ref+ highlighter.
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--------------------------
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addhl ref <shared_hl_name>
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--------------------------
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----------------
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addhl ref <name>
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----------------
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the +ref+ can reference any named highlighter in the shared namespace.
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Hooks
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-----
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@ -844,14 +940,17 @@ FIFO Buffer
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the +:edit+ command can take a -fifo parameter:
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-----------------------------------
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:edit -fifo <filename> <buffername>
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-----------------------------------
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---------------------------------------------
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:edit -fifo <filename> [-scroll] <buffername>
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---------------------------------------------
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in this case, a buffer named +<buffername>+ is created which reads its content
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from fifo +<filename>+. When the fifo is written to, the buffer is automatically
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updated.
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if the +-scroll+ switch is specified, the initial cursor position will be made
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such as the window displaying the buffer will scroll as new data is read.
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This is very useful for running some commands asynchronously while displaying
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their result in a buffer. See rc/make.kak and rc/grep.kak for examples.
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