'main': Introduce style fallback for the command word.
Fixes #316. * danielsh/i316-v2: 'main': Enable fallback to the 'arg0' style. 'main': Set fallback style for the 'arg0' style.
This commit is contained in:
Daniel Shahaf
commit
094329eb14
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@ -44,6 +44,7 @@ This highlighter defines the following styles:
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* `assign` - parameter assignments
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* `redirection` - redirection operators (`<`, `>`, etc)
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* `comment` - comments, when `setopt INTERACTIVE_COMMENTS` is in effect (`echo # foo`)
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* `arg0` - a command word other than one of those enumrated above (other than a command, precommand, alias, function, or shell builtin command).
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* `default` - everything else
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To override one of those styles, change its entry in `ZSH_HIGHLIGHT_STYLES`,
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@ -65,4 +66,26 @@ The syntax for values is the same as the syntax of "types of highlighting" of
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the zsh builtin `$zle_highlight` array, which is documented in [the `zshzle(1)`
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manual page][zshzle-Character-Highlighting].
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### Useless trivia
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#### Forward compatibility.
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zsh-syntax-highlighting attempts to be forward-compatible with zsh.
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Specifically, we attempt to facilitate highlighting _command word_ types that
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had not yet been invented when this version of zsh-syntax-highlighting was
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released.
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A _command word_ is something like a function name, external command name, et
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cetera. (See
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[Simple Commands & Pipelines in `zshmisc(1)`][zshmisc-Simple-Commands-And-Pipelines]
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for a formal definition.)
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If a new _kind_ of command word is ever added to zsh — something conceptually
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different than "function" and "alias" and "external command" — then command words
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of that (new) kind will be highlighted by the style `arg0_$kind`,
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where `$kind` is the output of `type -w` on the new kind of command word. If that
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style is not defined, then the style `arg0` will be used instead.
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[zshmisc-Simple-Commands-And-Pipelines]: http://zsh.sourceforge.net/Doc/Release/Shell-Grammar.html#Simple-Commands-_0026-Pipelines
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[zshzle-Character-Highlighting]: http://zsh.sourceforge.net/Doc/Release/Zsh-Line-Editor.html#Character-Highlighting
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@ -32,17 +32,11 @@
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: ${ZSH_HIGHLIGHT_STYLES[default]:=none}
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: ${ZSH_HIGHLIGHT_STYLES[unknown-token]:=fg=red,bold}
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: ${ZSH_HIGHLIGHT_STYLES[reserved-word]:=fg=yellow}
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: ${ZSH_HIGHLIGHT_STYLES[alias]:=fg=green}
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: ${ZSH_HIGHLIGHT_STYLES[suffix-alias]:=fg=green,underline}
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: ${ZSH_HIGHLIGHT_STYLES[builtin]:=fg=green}
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: ${ZSH_HIGHLIGHT_STYLES[function]:=fg=green}
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: ${ZSH_HIGHLIGHT_STYLES[command]:=fg=green}
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: ${ZSH_HIGHLIGHT_STYLES[precommand]:=fg=green,underline}
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: ${ZSH_HIGHLIGHT_STYLES[commandseparator]:=none}
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: ${ZSH_HIGHLIGHT_STYLES[hashed-command]:=fg=green}
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: ${ZSH_HIGHLIGHT_STYLES[path]:=underline}
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: ${ZSH_HIGHLIGHT_STYLES[path_pathseparator]:=}
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: ${ZSH_HIGHLIGHT_STYLES[path_prefix]:=underline}
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: ${ZSH_HIGHLIGHT_STYLES[path_prefix_pathseparator]:=}
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: ${ZSH_HIGHLIGHT_STYLES[globbing]:=fg=blue}
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: ${ZSH_HIGHLIGHT_STYLES[history-expansion]:=fg=blue}
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@ -58,6 +52,7 @@
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: ${ZSH_HIGHLIGHT_STYLES[assign]:=none}
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: ${ZSH_HIGHLIGHT_STYLES[redirection]:=none}
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: ${ZSH_HIGHLIGHT_STYLES[comment]:=fg=black,bold}
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: ${ZSH_HIGHLIGHT_STYLES[arg0]:=fg=green}
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# Whether the highlighter should be called or not.
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_zsh_highlight_highlighter_main_predicate()
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@ -71,6 +66,33 @@ _zsh_highlight_main_add_region_highlight() {
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integer start=$1 end=$2
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shift 2
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if (( $+argv[2] )); then
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# Caller specified inheritance explicitly.
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else
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# Automate inheritance.
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typeset -A fallback_of; fallback_of=(
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alias arg0
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suffix-alias arg0
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builtin arg0
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function arg0
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command arg0
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precommand arg0
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hashed-command arg0
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path_prefix path
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# The path separator fallback won't ever be used, due to the optimisation
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# in _zsh_highlight_main_highlighter_highlight_path_separators().
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path_pathseparator path
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path_prefix_pathseparator path_prefix
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)
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local needle=$1 value
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while [[ -n ${value::=$fallback_of[$needle]} ]]; do
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unset "fallback_of[$needle]" # paranoia against infinite loops
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argv+=($value)
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needle=$value
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done
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fi
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# The calculation was relative to $PREBUFFER$BUFFER, but region_highlight is
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# relative to $BUFFER.
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(( start -= $#PREBUFFER ))
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@ -581,7 +603,7 @@ _zsh_highlight_highlighter_main_paint()
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fi
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fi
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;;
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*) _zsh_highlight_main_add_region_highlight $start_pos $end_pos commandtypefromthefuture-$res
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*) _zsh_highlight_main_add_region_highlight $start_pos $end_pos arg0_$res arg0
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already_added=1
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;;
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esac
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@ -0,0 +1,40 @@
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#!/usr/bin/env zsh
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# -------------------------------------------------------------------------------------------------
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# Copyright (c) 2016 zsh-syntax-highlighting contributors
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without modification, are permitted
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# provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice, this list of conditions
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# and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice, this list of
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# conditions and the following disclaimer in the documentation and/or other materials provided
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# with the distribution.
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# * Neither the name of the zsh-syntax-highlighting contributors nor the names of its contributors
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# may be used to endorse or promote products derived from this software without specific prior
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# written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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# FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
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# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
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# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# -------------------------------------------------------------------------------------------------
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# -*- mode: zsh; sh-indentation: 2; indent-tabs-mode: nil; sh-basic-offset: 2; -*-
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# vim: ft=zsh sw=2 ts=2 et
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# -------------------------------------------------------------------------------------------------
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_zsh_highlight_add_highlight()
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{
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region_highlight+=("$1 $2 ${(j.,.)argv[3,-1]}")
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}
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BUFFER='type'
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expected_region_highlight=(
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'1 4 builtin,arg0' # type
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)
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