276 lines
9.5 KiB
Plaintext
276 lines
9.5 KiB
Plaintext
= Highlighters
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== Description
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Manipulation of the displayed text is done through highlighters, which can
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be added or removed with the following commands:
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----------------------------------------------------------------------
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add-highlighter <path> <highlighter_name> <highlighter_parameters> ...
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----------------------------------------------------------------------
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and
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------------------------------------------
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remove-highlighter <path>/<highlighter_id>
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------------------------------------------
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*path* is the name of an highlighter group, it is expressed as a */*
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separated path starting with a scope. Scopes are *global*, *buffer*,
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*window* and *shared*
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*highlighter_id* is a name generated by the highlighter specified with
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*highlighter_name*, possibly dependent on the parameters. Use command
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completion in a prompt on the *remove-highlighter* command to see the
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existing highlighters ids.
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== Convenient highlighters
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*show_matching*::
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highlight matching char of the character under the selections' cursor
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using `MatchingChar` face
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*show_whitespaces* [options]::
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display symbols on top of whitespaces to make them more explicit
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using the `Whitespace` face, with the following *options*:
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*-lf* <separator>:::
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a one character long separator that will replace line feeds
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*-spc* <separator>:::
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a one character long separator that will replace spaces
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*-nbsp* <separator>:::
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a one character long separator that will replace non-breakable spaces
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*-tab* <separator>:::
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a one character long separator that will replace tabulations
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*-tabpad* <separator>:::
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a one character long separator that will be appended to tabulations to honor the *tabstop* option
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*number_lines* [options]::
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show line numbers, with the following *options*:
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*-relative*:::
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show line numbers relative to the main cursor line
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*-hlcursor*:::
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highlight the cursor line with a separate face
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*-separator* <separator text>:::
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specify a string to separate the line numbers column with
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the rest of the buffer (default is '|')
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*wrap* [options]::
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soft wrap buffer text at window width, with the following *options*:
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*-word*:::
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wrap at word boundaries instead of codepoint boundaries.
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*-indent*:::
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preserve line indent when wrapping.
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*-width <max_width>*:::
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wrap text at *max_width* if the window is wider.
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== General highlighters
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*fill* <face>::
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fill using the given *face*, mostly useful with regions highlighters
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*column* <number> <face>::
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highlight column *number* with face *face*
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*line* <number> <face>::
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highlight line *number* with face *face*
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*regex* <regex> <capture_id>:<face> ...::
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highlight a regex, takes the regex as first parameter, followed by
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any number of face parameters.
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This highlights C++ style comments in cyan, with an eventual 'TODO:'
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in yellow on red background:
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-------------------------------------------------------------------
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add-highlighter window regex //\h*(TODO:)[^\n]* 0:cyan 1:yellow,red
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-------------------------------------------------------------------
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*dynregex* <expression> <capture_id>:<face> ...::
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similar to regex, but expand (like a command parameter would) the
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given expression before building a regex from the result.
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This highlights all the current search matches in italic:
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---------------------------------------------
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add-highlighter window dynregex '%reg{/}' 0:i
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---------------------------------------------
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== Specs highlighters
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The following highlighters are useful to add indicators like lint warnings,
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git blame output or spelling typos.
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See <<options#types,`:doc options types`>> for the format of `line-specs`
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and `range-specs`.
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*flag_lines* <face> <option_name>::
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add columns in front of the buffer, and display the flags specified
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in `line-specs` option, using <face>.
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In this example two words will be added in the gutter: a blue Foo at
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line 1 and a bold red/yellow Bar on line 3:
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---------------------------------------------------------------
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declare-option line-specs my_flags
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set-option window my_flags 1486635122:1|Foo:3|{red,yellow+b}Bar
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add-highlighter window/ flag_lines blue my_flags
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---------------------------------------------------------------
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*ranges* <option_name>::
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use the data in the `range-specs` option of the given name to highlight
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the buffer. The string part of each tuple of the range-specs is
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interpreted as a *face* to apply to the range.
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In this example the 3 first chars of the buffer will be colored in red:
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-------------------------------------------------
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declare-option range-specs my_range
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set-option window my_range 1486635122:1.1,1.3|red
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add-highlighter window/ ranges my_range
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-------------------------------------------------
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*replace-ranges* <option_name>::
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use the data in the `range-specs` option of the given name to highlight
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the buffer. The string part of each tuple of the range-specs is
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interpreted as a *display line* to display in place of the range.
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Here, the 3 first chars of the buffer will be replaced by the word 'red':
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-------------------------------------------------
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declare-option range-specs my_range
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set-option window my_range 1486635122:1.1,1.3|red
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add-highlighter window/ replace-ranges my_range
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-------------------------------------------------
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== Highlighting Groups
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The *group* highlighter is a container for other highlighters. A subgroup
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can be added to an existing group or scope using:
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-----------------------------------
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add-highlighter <path> group <name>
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-----------------------------------
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That group is then accessible using the *<path>/<name>* path
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------------------------------------------------
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add-highlighter <path>/<name> <type> <params>...
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------------------------------------------------
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In order to specify which kinds of highlighters can be added to a given group, the *-passes*
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flag set can be passed along with the group name. Possible values for this option can be one
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or several (separated with a pipe sign) of *colorize*, *move* or *wrap* (default: *colorize*):
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--------------------------------------------------------------
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add-highlighter window group -passes colorize|move|wrap <name>
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--------------------------------------------------------------
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== Regions highlighters
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A special highlighter provides a way to segment the buffer into regions,
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which are to be highlighted differently.
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*name*::
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user defined, used to identify the region
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*opening*::
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regex that defines the region start text
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*closing*::
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regex that defines the region end text
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*recurse*::
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regex that defines the text that matches recursively an end token
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into the region
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The *recurse* option is useful for regions that can be nested, for example
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the following contruct:
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----------
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%sh{ ... }
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----------
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accepts nested braces scopes ('{ ... }') so the following string is valid:
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----------------------
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%sh{ ... { ... } ... }
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----------------------
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This region can be defined with:
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------------------------
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shell_expand %sh\{ \} \{
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------------------------
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Regions are used in the region highlighters which can take any number
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of regions.
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The following command:
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------------------------------------------------------
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add-highlighter <path> regions <name> \
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<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 as follows:
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-----------------------------------------------
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add-highlighter <path>/<name>/<region_name> ...
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-----------------------------------------------
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Regions are matched using the left-most rule: the left-most region opening
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starts a new region. When a region closes, the closest next opening start
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another region.
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That matches the rule governing most programming language parsing.
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Regions 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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If the *-match-capture* switch is passed, then region closing and recurse
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matches are considered valid for a given region opening match only if they
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matched the same content for the capture 1.
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Most programming languages can then be properly highlighted using a region
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highlighter as root:
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-----------------------------------------------------------------
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add-highlighter <path> regions -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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add-highlighter <path>/<lang>/code ...
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add-highlighter <path>/<lang>/string ...
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add-highlighter <path>/<lang>/comment ...
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-----------------------------------------------------------------
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== Shared Highlighters
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Highlighters are often defined for a specific filetype, and it makes then
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sense to share the highlighters between all the windows on the same filetypes.
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Highlighters can be put in the shared scope in order to make them reusable.
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---------------------------------------
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add-highlighter shared/<group_name> ...
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---------------------------------------
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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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add-highlighter shared/ group <name>
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add-highlighter shared/<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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add-highlighter ref <name>
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--------------------------
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The ref can reference any named highlighter in the shared scope.
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