rc/zsh-syntax-highlighting/zsh-syntax-highlighting.zsh
2015-11-07 18:09:26 +01:00

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# -------------------------------------------------------------------------------------------------
# Copyright (c) 2010-2015 zsh-syntax-highlighting contributors
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without modification, are permitted
# provided that the following conditions are met:
#
# * Redistributions of source code must retain the above copyright notice, this list of conditions
# and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright notice, this list of
# conditions and the following disclaimer in the documentation and/or other materials provided
# with the distribution.
# * Neither the name of the zsh-syntax-highlighting contributors nor the names of its contributors
# may be used to endorse or promote products derived from this software without specific prior
# written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
# IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
# FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
# IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
# -------------------------------------------------------------------------------------------------
# -*- mode: zsh; sh-indentation: 2; indent-tabs-mode: nil; sh-basic-offset: 2; -*-
# vim: ft=zsh sw=2 ts=2 et
# -------------------------------------------------------------------------------------------------
if [[ -o function_argzero ]]; then
# $0 is reliable
ZSH_HIGHLIGHT_VERSION=$(<"$0:A:h"/.version)
ZSH_HIGHLIGHT_REVISION=$(<"$0:A:h"/.revision-hash)
if [[ $ZSH_HIGHLIGHT_REVISION == \$Format:* ]]; then
# When running from a source tree without 'make install', $ZSH_HIGHLIGHT_REVISION
# would be set to '$Format:%H$' literally. That's an invalid value, and obtaining
# the valid value (via `git rev-parse HEAD`, as Makefile does) might be costly, so:
unset ZSH_HIGHLIGHT_REVISION
fi
else
# $0 is unreliable, so the call to _zsh_highlight_load_highlighters will fail.
# TODO: If 'zmodload zsh/parameter' is available, ${funcsourcetrace[1]%:*} might serve as a substitute?
# TODO: also check POSIX_ARGZERO, but not it's not available in older zsh
echo "zsh-syntax-highlighting: error: not compatible with FUNCTION_ARGZERO" >&2
return 1
fi
# -------------------------------------------------------------------------------------------------
# Core highlighting update system
# -------------------------------------------------------------------------------------------------
# Array declaring active highlighters names.
typeset -ga ZSH_HIGHLIGHT_HIGHLIGHTERS
# Update ZLE buffer syntax highlighting.
#
# Invokes each highlighter that needs updating.
# This function is supposed to be called whenever the ZLE state changes.
_zsh_highlight()
{
# Store the previous command return code to restore it whatever happens.
local ret=$?
setopt localoptions warncreateglobal
local REPLY # don't leak $REPLY into global scope
# Do not highlight if there are more than 300 chars in the buffer. It's most
# likely a pasted command or a huge list of files in that case..
[[ -n ${ZSH_HIGHLIGHT_MAXLENGTH:-} ]] && [[ $#BUFFER -gt $ZSH_HIGHLIGHT_MAXLENGTH ]] && return $ret
# Do not highlight if there are pending inputs (copy/paste).
[[ $PENDING -gt 0 ]] && return $ret
# Reset region highlight to build it from scratch
typeset -ga region_highlight
region_highlight=();
{
local cache_place
local -a region_highlight_copy
# Select which highlighters in ZSH_HIGHLIGHT_HIGHLIGHTERS need to be invoked.
local highlighter; for highlighter in $ZSH_HIGHLIGHT_HIGHLIGHTERS; do
# eval cache place for current highlighter and prepare it
cache_place="_zsh_highlight_${highlighter}_highlighter_cache"
typeset -ga ${cache_place}
# If highlighter needs to be invoked
if "_zsh_highlight_${highlighter}_highlighter_predicate"; then
# save a copy, and cleanup region_highlight
region_highlight_copy=("${region_highlight[@]}")
region_highlight=()
# Execute highlighter and save result
{
"_zsh_highlight_${highlighter}_highlighter"
} always {
eval "${cache_place}=(\"\${region_highlight[@]}\")"
}
# Restore saved region_highlight
region_highlight=("${region_highlight_copy[@]}")
fi
# Use value form cache if any cached
eval "region_highlight+=(\"\${${cache_place}[@]}\")"
done
# Re-apply zle_highlight settings
() {
if (( REGION_ACTIVE )) ; then
# zle_highlight[region] defaults to 'standout' if unspecified
local region="${${zle_highlight[(r)region:*]#region:}:-standout}"
integer start end
if (( MARK > CURSOR )) ; then
start=$CURSOR end=$MARK
else
start=$MARK end=$CURSOR
fi
region_highlight+=("$start $end $region")
fi
}
# YANK_ACTIVE is only available in zsh-5.1.1 and newer
(( $+YANK_ACTIVE )) && () {
if (( YANK_ACTIVE )) ; then
# zle_highlight[paste] defaults to 'standout' if unspecified
local paste="${${zle_highlight[(r)paste:*]#paste:}:-standout}"
integer start end
if (( YANK_END > YANK_START )) ; then
start=$YANK_START end=$YANK_END
else
start=$YANK_END end=$YANK_START
fi
region_highlight+=("$start $end $paste")
fi
}
return $ret
} always {
typeset -g _ZSH_HIGHLIGHT_PRIOR_BUFFER="$BUFFER"
typeset -gi _ZSH_HIGHLIGHT_PRIOR_CURSOR=$CURSOR
}
}
# -------------------------------------------------------------------------------------------------
# API/utility functions for highlighters
# -------------------------------------------------------------------------------------------------
# Array used by highlighters to declare user overridable styles.
typeset -gA ZSH_HIGHLIGHT_STYLES
# Whether the command line buffer has been modified or not.
#
# Returns 0 if the buffer has changed since _zsh_highlight was last called.
_zsh_highlight_buffer_modified()
{
[[ "${_ZSH_HIGHLIGHT_PRIOR_BUFFER:-}" != "$BUFFER" ]]
}
# Whether the cursor has moved or not.
#
# Returns 0 if the cursor has moved since _zsh_highlight was last called.
_zsh_highlight_cursor_moved()
{
[[ -n $CURSOR ]] && [[ -n ${_ZSH_HIGHLIGHT_PRIOR_CURSOR-} ]] && (($_ZSH_HIGHLIGHT_PRIOR_CURSOR != $CURSOR))
}
# -------------------------------------------------------------------------------------------------
# Setup functions
# -------------------------------------------------------------------------------------------------
# Helper for _zsh_highlight_bind_widgets
# $1 is name of widget to call
_zsh_highlight_call_widget()
{
builtin zle "$@" &&
_zsh_highlight
}
# Rebind all ZLE widgets to make them invoke _zsh_highlights.
_zsh_highlight_bind_widgets()
{
# Load ZSH module zsh/zleparameter, needed to override user defined widgets.
zmodload zsh/zleparameter 2>/dev/null || {
echo 'zsh-syntax-highlighting: failed loading zsh/zleparameter.' >&2
return 1
}
# Override ZLE widgets to make them invoke _zsh_highlight.
local cur_widget
for cur_widget in ${${(f)"$(builtin zle -la)"}:#(.*|_*|orig-*|run-help|which-command|beep|set-local-history|yank)}; do
case $widgets[$cur_widget] in
# Already rebound event: do nothing.
user:$cur_widget|user:_zsh_highlight_widget_*);;
# User defined widget: override and rebind old one with prefix "orig-".
user:*) eval "zle -N orig-$cur_widget ${widgets[$cur_widget]#*:}; \
_zsh_highlight_widget_$cur_widget() { _zsh_highlight_call_widget orig-$cur_widget \"\$@\" }; \
zle -N $cur_widget _zsh_highlight_widget_$cur_widget";;
# Completion widget: override and rebind old one with prefix "orig-".
completion:*) eval "zle -C orig-$cur_widget ${${widgets[$cur_widget]#*:}/:/ }; \
_zsh_highlight_widget_$cur_widget() { _zsh_highlight_call_widget orig-$cur_widget \"\$@\" }; \
zle -N $cur_widget _zsh_highlight_widget_$cur_widget";;
# Builtin widget: override and make it call the builtin ".widget".
builtin) eval "_zsh_highlight_widget_$cur_widget() { _zsh_highlight_call_widget .$cur_widget \"\$@\" }; \
zle -N $cur_widget _zsh_highlight_widget_$cur_widget";;
# Default: unhandled case.
*) echo "zsh-syntax-highlighting: unhandled ZLE widget '$cur_widget'" >&2 ;;
esac
done
}
# Load highlighters from directory.
#
# Arguments:
# 1) Path to the highlighters directory.
_zsh_highlight_load_highlighters()
{
# Check the directory exists.
[[ -d "$1" ]] || {
echo "zsh-syntax-highlighting: highlighters directory '$1' not found." >&2
return 1
}
# Load highlighters from highlighters directory and check they define required functions.
local highlighter highlighter_dir
for highlighter_dir ($1/*/); do
highlighter="${highlighter_dir:t}"
[[ -f "$highlighter_dir/${highlighter}-highlighter.zsh" ]] && {
. "$highlighter_dir/${highlighter}-highlighter.zsh"
type "_zsh_highlight_${highlighter}_highlighter" &> /dev/null &&
type "_zsh_highlight_${highlighter}_highlighter_predicate" &> /dev/null || {
echo "zsh-syntax-highlighting: '${highlighter}' highlighter should define both required functions '_zsh_highlight_${highlighter}_highlighter' and '_zsh_highlight_${highlighter}_highlighter_predicate' in '${highlighter_dir}/${highlighter}-highlighter.zsh'." >&2
}
}
done
}
# -------------------------------------------------------------------------------------------------
# Setup
# -------------------------------------------------------------------------------------------------
# Try binding widgets.
_zsh_highlight_bind_widgets || {
echo 'zsh-syntax-highlighting: failed binding ZLE widgets, exiting.' >&2
return 1
}
# Resolve highlighters directory location.
_zsh_highlight_load_highlighters "${ZSH_HIGHLIGHT_HIGHLIGHTERS_DIR:-${${0:A}:h}/highlighters}" || {
echo 'zsh-syntax-highlighting: failed loading highlighters, exiting.' >&2
return 1
}
# Reset scratch variables when commandline is done.
_zsh_highlight_preexec_hook()
{
typeset -g _ZSH_HIGHLIGHT_PRIOR_BUFFER=
typeset -gi _ZSH_HIGHLIGHT_PRIOR_CURSOR=
}
autoload -U add-zsh-hook
add-zsh-hook preexec _zsh_highlight_preexec_hook 2>/dev/null || {
echo 'zsh-syntax-highlighting: failed loading add-zsh-hook.' >&2
}
# Initialize the array of active highlighters if needed.
[[ $#ZSH_HIGHLIGHT_HIGHLIGHTERS -eq 0 ]] && ZSH_HIGHLIGHT_HIGHLIGHTERS=(main) || true