From d284c594d92dafac1b578dae523f9454d50bce75 Mon Sep 17 00:00:00 2001
From: Tovi Jaeschke-Rogers <tovi.jaeschke-rogers@four.io>
Date: Sun, 13 Jun 2021 10:44:42 +0930
Subject: [PATCH] Add zsh-syntax-highlighting.zsh

---
 .zsh/fsh                             |   1 -
 .zsh/fsh/zsh-syntax-highlighting.zsh | 597 +++++++++++++++++++++++++++
 2 files changed, 597 insertions(+), 1 deletion(-)
 delete mode 160000 .zsh/fsh
 create mode 100644 .zsh/fsh/zsh-syntax-highlighting.zsh

diff --git a/.zsh/fsh b/.zsh/fsh
deleted file mode 160000
index be2f385..0000000
--- a/.zsh/fsh
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit be2f385453670c18c40320a7384333f98fcd9f79
diff --git a/.zsh/fsh/zsh-syntax-highlighting.zsh b/.zsh/fsh/zsh-syntax-highlighting.zsh
new file mode 100644
index 0000000..d20dc5b
--- /dev/null
+++ b/.zsh/fsh/zsh-syntax-highlighting.zsh
@@ -0,0 +1,597 @@
+# -------------------------------------------------------------------------------------------------
+# 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 a function has been marked for autoloading
+# but is not available in $fpath, then this function will return False therefor.
+#
+# 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 5.8.0.3 and newer the memo= feature is available.
+        #
+        # On zsh version 5.8.0.2 between the aforementioned commit and the
+        # first Config/version.mk bump after it (which, at the time of writing,
+        # is yet to come), this condition will false negative.
+        if is-at-least 5.8.0.3 $ZSH_VERSION.0.0; then
+          integer -gr zsh_highlight__memo_feature=1
+        else
+          integer -gr zsh_highlight__memo_feature=0
+        fi
+        ;;
+    esac
+    region_highlight[-1]=()
+  }
+
+  # Reset region_highlight to build it from scratch
+  if (( zsh_highlight__memo_feature )); then
+    region_highlight=( "${(@)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).
+  [[ $PENDING -gt 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.  (The use of 5.8.0.2
+#    rather than 5.8.0.3 as in the _zsh_highlight is deliberate.)
+if is-at-least 5.8.0.2 $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