224 lines
8.9 KiB
Bash
224 lines
8.9 KiB
Bash
#!/usr/bin/env zsh
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# -------------------------------------------------------------------------------------------------
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# Copyright (c) 2010-2011 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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# -------------------------------------------------------------------------------------------------
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# Core highlighting update system
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# -------------------------------------------------------------------------------------------------
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# Array declaring active highlighters names.
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typeset -ga ZSH_HIGHLIGHT_HIGHLIGHTERS
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# Update ZLE buffer syntax highlighting.
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#
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# Invokes each highlighter that needs updating.
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# This function is supposed to be called whenever the ZLE state changes.
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_zsh_highlight()
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{
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setopt localoptions nowarncreateglobal
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# Store the previous command return code to restore it whatever happens.
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local ret=$?
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# Do not highlight if there are more than 300 chars in the buffer. It's most
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# likely a pasted command or a huge list of files in that case..
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[[ -n ${ZSH_HIGHLIGHT_MAXLENGTH:-} ]] && [[ $#BUFFER -gt $ZSH_HIGHLIGHT_MAXLENGTH ]] && return $ret
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# Do not highlight if there are pending inputs (copy/paste).
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[[ $PENDING -gt 0 ]] && return $ret
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# Reset region highlight to build it from scratch
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region_highlight=();
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{
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local cache_place
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local -a region_highlight_copy
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# Select which highlighters in ZSH_HIGHLIGHT_HIGHLIGHTERS need to be invoked.
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local highlighter; for highlighter in $ZSH_HIGHLIGHT_HIGHLIGHTERS; do
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# eval cache place for current highlighter and prepare it
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cache_place="_zsh_highlight_${highlighter}_highlighter_cache"
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typeset -ga ${cache_place}
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# If highlighter needs to be invoked
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if "_zsh_highlight_${highlighter}_highlighter_predicate"; then
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# save a copy, and cleanup region_highlight
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region_highlight_copy=("${region_highlight[@]}")
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region_highlight=()
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# Execute highlighter and save result
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{
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"_zsh_highlight_${highlighter}_highlighter"
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} always {
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eval "${cache_place}=(\"\${region_highlight[@]}\")"
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}
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# Restore saved region_highlight
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region_highlight=("${region_highlight_copy[@]}")
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fi
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# Use value form cache if any cached
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eval "region_highlight+=(\"\${${cache_place}[@]}\")"
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done
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} always {
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_ZSH_HIGHLIGHT_PRIOR_BUFFER=$BUFFER
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_ZSH_HIGHLIGHT_PRIOR_CURSOR=$CURSOR
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return $ret
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}
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}
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# -------------------------------------------------------------------------------------------------
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# API/utility functions for highlighters
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# -------------------------------------------------------------------------------------------------
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# Array used by highlighters to declare user overridable styles.
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typeset -gA ZSH_HIGHLIGHT_STYLES
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# Whether the command line buffer has been modified or not.
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#
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# Returns 0 if the buffer has changed since _zsh_highlight was last called.
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_zsh_highlight_buffer_modified()
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{
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[[ "${_ZSH_HIGHLIGHT_PRIOR_BUFFER:-}" != "$BUFFER" ]]
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}
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# Whether the cursor has moved or not.
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#
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# Returns 0 if the cursor has moved since _zsh_highlight was last called.
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_zsh_highlight_cursor_moved()
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{
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[[ -n $CURSOR ]] && [[ -n ${_ZSH_HIGHLIGHT_PRIOR_CURSOR-} ]] && (($_ZSH_HIGHLIGHT_PRIOR_CURSOR != $CURSOR))
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}
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# -------------------------------------------------------------------------------------------------
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# Setup functions
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# -------------------------------------------------------------------------------------------------
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# Rebind all ZLE widgets to make them invoke _zsh_highlights.
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_zsh_highlight_bind_widgets()
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{
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# Load ZSH module zsh/zleparameter, needed to override user defined widgets.
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zmodload zsh/zleparameter 2>/dev/null || {
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echo 'zsh-syntax-highlighting: failed loading zsh/zleparameter.' >&2
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return 1
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}
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# Override ZLE widgets to make them invoke _zsh_highlight.
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local cur_widget
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for cur_widget in ${${(f)"$(builtin zle -la)"}:#(.*|_*|orig-*|run-help|which-command|beep|yank*)}; do
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case $widgets[$cur_widget] in
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# Already rebound event: do nothing.
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user:$cur_widget|user:_zsh_highlight_widget_*);;
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# User defined widget: override and rebind old one with prefix "orig-".
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user:*) eval "zle -N orig-$cur_widget ${widgets[$cur_widget]#*:}; \
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_zsh_highlight_widget_$cur_widget() { builtin zle orig-$cur_widget -- \"\$@\" && _zsh_highlight }; \
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zle -N $cur_widget _zsh_highlight_widget_$cur_widget";;
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# Completion widget: override and rebind old one with prefix "orig-".
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completion:*) eval "zle -C orig-$cur_widget ${${widgets[$cur_widget]#*:}/:/ }; \
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_zsh_highlight_widget_$cur_widget() { builtin zle orig-$cur_widget -- \"\$@\" && _zsh_highlight }; \
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zle -N $cur_widget _zsh_highlight_widget_$cur_widget";;
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# Builtin widget: override and make it call the builtin ".widget".
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builtin) eval "_zsh_highlight_widget_$cur_widget() { builtin zle .$cur_widget -- \"\$@\" && _zsh_highlight }; \
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zle -N $cur_widget _zsh_highlight_widget_$cur_widget";;
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# Default: unhandled case.
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*) echo "zsh-syntax-highlighting: unhandled ZLE widget '$cur_widget'" >&2 ;;
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esac
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done
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}
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# Load highlighters from directory.
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#
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# Arguments:
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# 1) Path to the highlighters directory.
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_zsh_highlight_load_highlighters()
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{
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# Check the directory exists.
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[[ -d "$1" ]] || {
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echo "zsh-syntax-highlighting: highlighters directory '$1' not found." >&2
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return 1
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}
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# Load highlighters from highlighters directory and check they define required functions.
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local highlighter highlighter_dir
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for highlighter_dir ($1/*/); do
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highlighter="${highlighter_dir:t}"
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[[ -f "$highlighter_dir/${highlighter}-highlighter.zsh" ]] && {
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. "$highlighter_dir/${highlighter}-highlighter.zsh"
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type "_zsh_highlight_${highlighter}_highlighter" &> /dev/null &&
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type "_zsh_highlight_${highlighter}_highlighter_predicate" &> /dev/null || {
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echo "zsh-syntax-highlighting: '${highlighter}' highlighter should define both required functions '_zsh_highlight_${highlighter}_highlighter' and '_zsh_highlight_${highlighter}_highlighter_predicate' in '${highlighter_dir}/${highlighter}-highlighter.zsh'." >&2
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}
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}
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done
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}
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# -------------------------------------------------------------------------------------------------
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# Setup
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# -------------------------------------------------------------------------------------------------
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# Try binding widgets.
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_zsh_highlight_bind_widgets || {
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echo 'zsh-syntax-highlighting: failed binding ZLE widgets, exiting.' >&2
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return 1
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}
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# Resolve highlighters directory location.
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_zsh_highlight_load_highlighters "${ZSH_HIGHLIGHT_HIGHLIGHTERS_DIR:-${${0:A}:h}/highlighters}" || {
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echo 'zsh-syntax-highlighting: failed loading highlighters, exiting.' >&2
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return 1
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}
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# Reset scratch variables when commandline is done.
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_zsh_highlight_preexec_hook()
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{
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_ZSH_HIGHLIGHT_PRIOR_BUFFER=
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_ZSH_HIGHLIGHT_PRIOR_CURSOR=
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}
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autoload -U add-zsh-hook
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add-zsh-hook preexec _zsh_highlight_preexec_hook 2>/dev/null || {
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echo 'zsh-syntax-highlighting: failed loading add-zsh-hook.' >&2
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}
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# Initialize the array of active highlighters if needed.
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[[ $#ZSH_HIGHLIGHT_HIGHLIGHTERS -eq 0 ]] && ZSH_HIGHLIGHT_HIGHLIGHTERS=(main) || true
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