zsh-syntax-highlighting/zsh-syntax-highlighting.zsh

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# -------------------------------------------------------------------------------------------------
# Copyright (c) 2010-2020 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
# -------------------------------------------------------------------------------------------------
# First of all, ensure predictable parsing.
typeset zsh_highlight__aliases="$(builtin alias -Lm '[^+]*')"
# In zsh <= 5.2, aliases that begin with a plus sign ('alias -- +foo=42')
# are emitted by `alias -L` without a '--' guard, so they don't round trip.
#
# Hence, we exclude them from unaliasing:
builtin unalias -m '[^+]*'
# Set $0 to the expected value, regardless of functionargzero.
0=${(%):-%N}
if true; then
# $0 is reliable
typeset -g ZSH_HIGHLIGHT_VERSION=$(<"${0:A:h}"/.version)
typeset -g ZSH_HIGHLIGHT_REVISION=$(<"${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:
ZSH_HIGHLIGHT_REVISION=HEAD
fi
fi
# This function takes a single argument F and returns True iff F is an autoload stub.
_zsh_highlight__function_is_autoload_stub_p() {
if zmodload -e zsh/parameter; then
#(( ${+functions[$1]} )) &&
[[ "$functions[$1]" == *"builtin autoload -X"* ]]
else
#[[ $(type -wa -- "$1") == *'function'* ]] &&
[[ "${${(@f)"$(which -- "$1")"}[2]}" == $'\t'$histchars[3]' undefined' ]]
fi
# Do nothing here: return the exit code of the if.
}
# Return True iff the argument denotes a function name.
_zsh_highlight__is_function_p() {
if zmodload -e zsh/parameter; then
(( ${+functions[$1]} ))
else
[[ $(type -wa -- "$1") == *'function'* ]]
fi
}
# This function takes a single argument F and returns True iff F denotes the
# name of a callable function. A function is callable if it is fully defined
# or if it is marked for autoloading and autoloading it at the first call to it
# will succeed. In particular, if F has been marked for autoloading
# but is not available in $fpath, then calling this function on F will return False.
#
# See users/21671 http://www.zsh.org/cgi-bin/mla/redirect?USERNUMBER=21671
_zsh_highlight__function_callable_p() {
if _zsh_highlight__is_function_p "$1" &&
! _zsh_highlight__function_is_autoload_stub_p "$1"
then
# Already fully loaded.
return 0 # true
else
# "$1" is either an autoload stub, or not a function at all.
#
# Use a subshell to avoid affecting the calling shell.
#
# We expect 'autoload +X' to return non-zero if it fails to fully load
# the function.
( autoload -U +X -- "$1" 2>/dev/null )
return $?
fi
}
# -------------------------------------------------------------------------------------------------
# Core highlighting update system
# -------------------------------------------------------------------------------------------------
# Use workaround for bug in ZSH?
# zsh-users/zsh@48cadf4 http://www.zsh.org/mla/workers//2017/msg00034.html
autoload -Uz is-at-least
if is-at-least 5.4; then
typeset -g zsh_highlight__pat_static_bug=false
else
typeset -g zsh_highlight__pat_static_bug=true
fi
# Array declaring active highlighters names.
typeset -ga ZSH_HIGHLIGHT_HIGHLIGHTERS
# Update ZLE buffer syntax highlighting.
#
# Invokes each highlighter that needs updating.
# This function is supposed to be called whenever the ZLE state changes.
_zsh_highlight()
{
# Store the previous command return code to restore it whatever happens.
local ret=$?
# Make it read-only. Can't combine this with the previous line when POSIX_BUILTINS may be set.
typeset -r ret
# $region_highlight should be predefined, either by zle or by the test suite's mock (non-special) array.
(( ${+region_highlight} )) || {
echo >&2 'zsh-syntax-highlighting: error: $region_highlight is not defined'
echo >&2 'zsh-syntax-highlighting: (Check whether zsh-syntax-highlighting was installed according to the instructions.)'
return $ret
}
# Probe the memo= feature, once.
(( ${+zsh_highlight__memo_feature} )) || {
region_highlight+=( " 0 0 fg=red, memo=zsh-syntax-highlighting" )
case ${region_highlight[-1]} in
("0 0 fg=red")
# zsh 5.8 or earlier
integer -gr zsh_highlight__memo_feature=0
;;
("0 0 fg=red memo=zsh-syntax-highlighting")
# zsh 5.9 or later
integer -gr zsh_highlight__memo_feature=1
;;
(" 0 0 fg=red, memo=zsh-syntax-highlighting") ;&
(*)
# We can get here in two ways:
#
# 1. When not running as a widget. In that case, $region_highlight is
# not a special variable (= one with custom getter/setter functions
# written in C) but an ordinary one, so the third case pattern matches
# and we fall through to this block. (The test suite uses this codepath.)
#
# 2. When running under a future version of zsh that will have changed
# the serialization of $region_highlight elements from their underlying
# C structs, so that none of the previous case patterns will match.
#
# In either case, fall back to a version check.
#
# The memo= feature was added to zsh in commit zsh-5.8-172-gdd6e702ee.
# The version number at the time was 5.8.0.2-dev (see Config/version.mk).
# Therefore, on zsh master 5.8.0.3 and newer the memo= feature is available.
# However, there's also the zsh 5.8.1 release, which doesn't have the
# memo= feature.
#
# On zsh master 5.8.0.2 between the aforementioned commit and the
# first Config/version.mk bump after it (zsh-5.8-607-g75c1edde5, the
# bump to 5.8.1.1-dev following the backport to master of the bump
# to 5.8.1), this condition will false negative.
if is-at-least 5.8.1.1 $ZSH_VERSION.0.0; then
integer -gr zsh_highlight__memo_feature=1
else
integer -gr zsh_highlight__memo_feature=0
fi
;;
esac
region_highlight[-1]=()
}
# Reset region_highlight to build it from scratch
if (( zsh_highlight__memo_feature )); then
region_highlight=( "${(@)region_highlight:#*memo=zsh-syntax-highlighting*}" )
else
# Legacy codepath. Not very interoperable with other plugins (issue #418).
region_highlight=()
fi
# Remove all highlighting in isearch, so that only the underlining done by zsh itself remains.
# For details see FAQ entry 'Why does syntax highlighting not work while searching history?'.
# This disables highlighting during isearch (for reasons explained in README.md) unless zsh is new enough
# and doesn't have the pattern matching bug
if [[ $WIDGET == zle-isearch-update ]] && { $zsh_highlight__pat_static_bug || ! (( $+ISEARCHMATCH_ACTIVE )) }; then
return $ret
fi
# Before we 'emulate -L', save the user's options
local -A zsyh_user_options
if zmodload -e zsh/parameter; then
zsyh_user_options=("${(kv)options[@]}")
else
local canonical_options onoff option raw_options
raw_options=(${(f)"$(emulate -R zsh; set -o)"})
canonical_options=(${${${(M)raw_options:#*off}%% *}#no} ${${(M)raw_options:#*on}%% *})
for option in "${canonical_options[@]}"; do
[[ -o $option ]]
case $? in
(0) zsyh_user_options+=($option on);;
(1) zsyh_user_options+=($option off);;
(*) # Can't happen, surely?
echo "zsh-syntax-highlighting: warning: '[[ -o $option ]]' returned $?"
;;
esac
done
fi
typeset -r zsyh_user_options
emulate -L zsh
setopt localoptions warncreateglobal nobashrematch
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).
(( KEYS_QUEUED_COUNT > 0 )) && return $ret
(( PENDING > 0 )) && return $ret
{
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 ${cache_place}
# If highlighter needs to be invoked
if ! type "_zsh_highlight_highlighter_${highlighter}_predicate" >&/dev/null; then
echo "zsh-syntax-highlighting: warning: disabling the ${(qq)highlighter} highlighter as it has not been loaded" >&2
# TODO: use ${(b)} rather than ${(q)} if supported
ZSH_HIGHLIGHT_HIGHLIGHTERS=( ${ZSH_HIGHLIGHT_HIGHLIGHTERS:#${highlighter}} )
elif "_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}_paint"
} always {
: ${(AP)cache_place::="${region_highlight[@]}"}
}
# Restore saved region_highlight
region_highlight=("${region_highlight_copy[@]}")
fi
# Use value form cache if any cached
region_highlight+=("${(@P)cache_place}")
done
# Re-apply zle_highlight settings
# region
() {
(( REGION_ACTIVE )) || return
integer min max
if (( MARK > CURSOR )) ; then
min=$CURSOR max=$MARK
else
min=$MARK max=$CURSOR
fi
if (( REGION_ACTIVE == 1 )); then
[[ $KEYMAP = vicmd ]] && (( max++ ))
elif (( REGION_ACTIVE == 2 )); then
local needle=$'\n'
# CURSOR and MARK are 0 indexed between letters like region_highlight
# Do not include the newline in the highlight
(( min = ${BUFFER[(Ib:min:)$needle]} ))
(( max = ${BUFFER[(ib:max:)$needle]} - 1 ))
fi
_zsh_highlight_apply_zle_highlight region standout "$min" "$max"
}
# yank / paste (zsh-5.1.1 and newer)
(( $+YANK_ACTIVE )) && (( YANK_ACTIVE )) && _zsh_highlight_apply_zle_highlight paste standout "$YANK_START" "$YANK_END"
# isearch
(( $+ISEARCHMATCH_ACTIVE )) && (( ISEARCHMATCH_ACTIVE )) && _zsh_highlight_apply_zle_highlight isearch underline "$ISEARCHMATCH_START" "$ISEARCHMATCH_END"
# suffix
(( $+SUFFIX_ACTIVE )) && (( SUFFIX_ACTIVE )) && _zsh_highlight_apply_zle_highlight suffix bold "$SUFFIX_START" "$SUFFIX_END"
return $ret
} always {
typeset -g _ZSH_HIGHLIGHT_PRIOR_BUFFER="$BUFFER"
typeset -gi _ZSH_HIGHLIGHT_PRIOR_CURSOR=$CURSOR
}
}
# Apply highlighting based on entries in the zle_highlight array.
# This function takes four arguments:
# 1. The exact entry (no patterns) in the zle_highlight array:
# region, paste, isearch, or suffix
# 2. The default highlighting that should be applied if the entry is unset
# 3. and 4. Two integer values describing the beginning and end of the
# range. The order does not matter.
_zsh_highlight_apply_zle_highlight() {
local entry="$1" default="$2"
integer first="$3" second="$4"
# read the relevant entry from zle_highlight
#
# ### In zsh≥5.0.8 we'd use ${(b)entry}, but we support older zsh's, so we don't
# ### add (b). The only effect is on the failure mode for callers that violate
# ### the precondition.
local region="${zle_highlight[(r)${entry}:*]-}"
if [[ -z "$region" ]]; then
# entry not specified at all, use default value
region=$default
else
# strip prefix
region="${region#${entry}:}"
# no highlighting when set to the empty string or to 'none'
if [[ -z "$region" ]] || [[ "$region" == none ]]; then
return
fi
fi
integer start end
if (( first < second )); then
start=$first end=$second
else
start=$second end=$first
fi
region_highlight+=("$start $end $region, memo=zsh-syntax-highlighting")
}
# -------------------------------------------------------------------------------------------------
# API/utility functions for highlighters
# -------------------------------------------------------------------------------------------------
# Array used by highlighters to declare user overridable styles.
typeset -gA ZSH_HIGHLIGHT_STYLES
# Whether the command line buffer has been modified or not.
#
# Returns 0 if the buffer has changed since _zsh_highlight was last called.
_zsh_highlight_buffer_modified()
{
[[ "${_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))
}
# Add a highlight defined by ZSH_HIGHLIGHT_STYLES.
#
# Should be used by all highlighters aside from 'pattern' (cf. ZSH_HIGHLIGHT_PATTERN).
# Overwritten in tests/test-highlighting.zsh when testing.
_zsh_highlight_add_highlight()
{
local -i start end
local highlight
start=$1
end=$2
shift 2
for highlight; do
if (( $+ZSH_HIGHLIGHT_STYLES[$highlight] )); then
region_highlight+=("$start $end $ZSH_HIGHLIGHT_STYLES[$highlight], memo=zsh-syntax-highlighting")
break
fi
done
}
# -------------------------------------------------------------------------------------------------
# Setup functions
# -------------------------------------------------------------------------------------------------
# Helper for _zsh_highlight_bind_widgets
# $1 is name of widget to call
_zsh_highlight_call_widget()
{
builtin zle "$@" &&
_zsh_highlight
}
# Decide whether to use the zle-line-pre-redraw codepath (colloquially known as
# "feature/redrawhook", after the topic branch's name) or the legacy "bind all
# widgets" codepath.
#
# We use the new codepath under two conditions:
#
# 1. If it's available, which we check by testing for add-zle-hook-widget's availability.
#
# 2. If zsh has the memo= feature, which is required for interoperability reasons.
# See issues #579 and #735, and the issues referenced from them.
#
# We check this with a plain version number check, since a functional check,
# as done by _zsh_highlight, can only be done from inside a widget
# function — a catch-22.
#
# See _zsh_highlight for the magic version number.
if is-at-least 5.8.1.1 $ZSH_VERSION.0.0 && _zsh_highlight__function_callable_p add-zle-hook-widget
then
autoload -U add-zle-hook-widget
_zsh_highlight__zle-line-finish() {
# Reset $WIDGET since the 'main' highlighter depends on it.
#
# Since $WIDGET is declared by zle as read-only in this function's scope,
# a nested function is required in order to shadow its built-in value;
# see "User-defined widgets" in zshall.
() {
local -h -r WIDGET=zle-line-finish
_zsh_highlight
}
}
_zsh_highlight__zle-line-pre-redraw() {
# Set $? to 0 for _zsh_highlight. Without this, subsequent
# zle-line-pre-redraw hooks won't run, since add-zle-hook-widget happens to
# call us with $? == 1 in the common case.
true && _zsh_highlight "$@"
}
_zsh_highlight_bind_widgets(){}
if [[ -o zle ]]; then
add-zle-hook-widget zle-line-pre-redraw _zsh_highlight__zle-line-pre-redraw
add-zle-hook-widget zle-line-finish _zsh_highlight__zle-line-finish
fi
else
# Rebind all ZLE widgets to make them invoke _zsh_highlights.
_zsh_highlight_bind_widgets()
{
setopt localoptions noksharrays
typeset -F SECONDS
local prefix=orig-s$SECONDS-r$RANDOM # unique each time, in case we're sourced more than once
# Load ZSH module zsh/zleparameter, needed to override user defined widgets.
zmodload zsh/zleparameter 2>/dev/null || {
print -r -- >&2 'zsh-syntax-highlighting: failed loading zsh/zleparameter.'
return 1
}
# Override ZLE widgets to make them invoke _zsh_highlight.
local -U widgets_to_bind
widgets_to_bind=(${${(k)widgets}:#(.*|run-help|which-command|beep|set-local-history|yank|yank-pop)})
# Always wrap special zle-line-finish widget. This is needed to decide if the
# current line ends and special highlighting logic needs to be applied.
# E.g. remove cursor imprint, don't highlight partial paths, ...
widgets_to_bind+=(zle-line-finish)
# Always wrap special zle-isearch-update widget to be notified of updates in isearch.
# This is needed because we need to disable highlighting in that case.
widgets_to_bind+=(zle-isearch-update)
local cur_widget
for cur_widget in $widgets_to_bind; do
case ${widgets[$cur_widget]:-""} in
# Already rebound event: do nothing.
user:_zsh_highlight_widget_*);;
# The "eval"'s are required to make $cur_widget a closure: the value of the parameter at function
# definition time is used.
#
# We can't use ${0/_zsh_highlight_widget_} because these widgets are always invoked with
# NO_function_argzero, regardless of the option's setting here.
# User defined widget: override and rebind old one with prefix "orig-".
user:*) zle -N $prefix-$cur_widget ${widgets[$cur_widget]#*:}
eval "_zsh_highlight_widget_${(q)prefix}-${(q)cur_widget}() { _zsh_highlight_call_widget ${(q)prefix}-${(q)cur_widget} -- \"\$@\" }"
zle -N $cur_widget _zsh_highlight_widget_$prefix-$cur_widget;;
# Completion widget: override and rebind old one with prefix "orig-".
completion:*) zle -C $prefix-$cur_widget ${${(s.:.)widgets[$cur_widget]}[2,3]}
eval "_zsh_highlight_widget_${(q)prefix}-${(q)cur_widget}() { _zsh_highlight_call_widget ${(q)prefix}-${(q)cur_widget} -- \"\$@\" }"
zle -N $cur_widget _zsh_highlight_widget_$prefix-$cur_widget;;
# Builtin widget: override and make it call the builtin ".widget".
builtin) eval "_zsh_highlight_widget_${(q)prefix}-${(q)cur_widget}() { _zsh_highlight_call_widget .${(q)cur_widget} -- \"\$@\" }"
zle -N $cur_widget _zsh_highlight_widget_$prefix-$cur_widget;;
# Incomplete or nonexistent widget: Bind to z-sy-h directly.
*)
if [[ $cur_widget == zle-* ]] && (( ! ${+widgets[$cur_widget]} )); then
_zsh_highlight_widget_${cur_widget}() { :; _zsh_highlight }
zle -N $cur_widget _zsh_highlight_widget_$cur_widget
else
# Default: unhandled case.
print -r -- >&2 "zsh-syntax-highlighting: unhandled ZLE widget ${(qq)cur_widget}"
print -r -- >&2 "zsh-syntax-highlighting: (This is sometimes caused by doing \`bindkey <keys> ${(q-)cur_widget}\` without creating the ${(qq)cur_widget} widget with \`zle -N\` or \`zle -C\`.)"
fi
esac
done
}
fi
# Load highlighters from directory.
#
# Arguments:
# 1) Path to the highlighters directory.
_zsh_highlight_load_highlighters()
{
setopt localoptions noksharrays bareglobqual
# Check the directory exists.
[[ -d "$1" ]] || {
print -r -- >&2 "zsh-syntax-highlighting: highlighters directory ${(qq)1} not found."
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"
if type "_zsh_highlight_highlighter_${highlighter}_paint" &> /dev/null &&
type "_zsh_highlight_highlighter_${highlighter}_predicate" &> /dev/null;
then
# New (0.5.0) function names
elif type "_zsh_highlight_${highlighter}_highlighter" &> /dev/null &&
type "_zsh_highlight_${highlighter}_highlighter_predicate" &> /dev/null;
then
# Old (0.4.x) function names
if false; then
# TODO: only show this warning for plugin authors/maintainers, not for end users
print -r -- >&2 "zsh-syntax-highlighting: warning: ${(qq)highlighter} highlighter uses deprecated entry point names; please ask its maintainer to update it: https://github.com/zsh-users/zsh-syntax-highlighting/issues/329"
fi
# Make it work.
eval "_zsh_highlight_highlighter_${(q)highlighter}_paint() { _zsh_highlight_${(q)highlighter}_highlighter \"\$@\" }"
eval "_zsh_highlight_highlighter_${(q)highlighter}_predicate() { _zsh_highlight_${(q)highlighter}_highlighter_predicate \"\$@\" }"
else
print -r -- >&2 "zsh-syntax-highlighting: ${(qq)highlighter} highlighter should define both required functions '_zsh_highlight_highlighter_${highlighter}_paint' and '_zsh_highlight_highlighter_${highlighter}_predicate' in ${(qq):-"$highlighter_dir${highlighter}-highlighter.zsh"}."
fi
done
}
# -------------------------------------------------------------------------------------------------
# Setup
# -------------------------------------------------------------------------------------------------
# Try binding widgets.
_zsh_highlight_bind_widgets || {
print -r -- >&2 'zsh-syntax-highlighting: failed binding ZLE widgets, exiting.'
return 1
}
# Resolve highlighters directory location.
_zsh_highlight_load_highlighters "${ZSH_HIGHLIGHT_HIGHLIGHTERS_DIR:-${${0:A}:h}/highlighters}" || {
print -r -- >&2 'zsh-syntax-highlighting: failed loading highlighters, exiting.'
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 -Uz add-zsh-hook
add-zsh-hook preexec _zsh_highlight_preexec_hook 2>/dev/null || {
print -r -- >&2 'zsh-syntax-highlighting: failed loading add-zsh-hook.'
}
# Load zsh/parameter module if available
zmodload zsh/parameter 2>/dev/null || true
# Initialize the array of active highlighters if needed.
[[ $#ZSH_HIGHLIGHT_HIGHLIGHTERS -eq 0 ]] && ZSH_HIGHLIGHT_HIGHLIGHTERS=(main)
if (( $+X_ZSH_HIGHLIGHT_DIRS_BLACKLIST )); then
print >&2 'zsh-syntax-highlighting: X_ZSH_HIGHLIGHT_DIRS_BLACKLIST is deprecated. Please use ZSH_HIGHLIGHT_DIRS_BLACKLIST.'
ZSH_HIGHLIGHT_DIRS_BLACKLIST=($X_ZSH_HIGHLIGHT_DIRS_BLACKLIST)
unset X_ZSH_HIGHLIGHT_DIRS_BLACKLIST
fi
# Restore the aliases we unned
eval "$zsh_highlight__aliases"
builtin unset zsh_highlight__aliases
# Set $?.
true