Support $''-quoted strings.

This does not yet highlight backslash escapes within them.

highlighters/main/README.md

@@ -42,6 +42,7 @@ This highlighter defines the following styles:
 * `back-quoted-argument` - backquoted expressions (`` `foo` ``)
 * `single-quoted-argument` - single quoted arguments (`` 'foo' ``)
 * `double-quoted-argument` - double quoted arguments (`` "foo" ``)
+* `dollar-quoted-argument` - dollar quoted arguments (`` $'foo' ``)
 * `dollar-double-quoted-argument` -  dollar double quoted arguments ($foo inside "")
 * `back-double-quoted-argument` -  back double quoted arguments (\x inside "")
 * `assign` - variable assignments

highlighters/main/main-highlighter.zsh

@@ -51,6 +51,7 @@
 : ${ZSH_HIGHLIGHT_STYLES[back-quoted-argument]:=none}
 : ${ZSH_HIGHLIGHT_STYLES[single-quoted-argument]:=fg=yellow}
 : ${ZSH_HIGHLIGHT_STYLES[double-quoted-argument]:=fg=yellow}
+: ${ZSH_HIGHLIGHT_STYLES[dollar-quoted-argument]:=fg=yellow}
 : ${ZSH_HIGHLIGHT_STYLES[dollar-double-quoted-argument]:=fg=cyan}
 : ${ZSH_HIGHLIGHT_STYLES[back-double-quoted-argument]:=fg=cyan}
 : ${ZSH_HIGHLIGHT_STYLES[assign]:=none}
@@ -198,6 +199,8 @@ _zsh_highlight_main_highlighter()
                  _zsh_highlight_main_highlighter_highlight_string
                  substr_color=1
                  ;;
+        \$\'*)   style=$ZSH_HIGHLIGHT_STYLES[dollar-quoted-argument]
+                 ;;
         '`'*)    style=$ZSH_HIGHLIGHT_STYLES[back-quoted-argument];;
         *[*?]*)  $highlight_glob && style=$ZSH_HIGHLIGHT_STYLES[globbing] || style=$ZSH_HIGHLIGHT_STYLES[default];;
         *)       if _zsh_highlight_main_highlighter_check_path; then

highlighters/main/test-data/dollar-quoted.zsh

@@ -0,0 +1,35 @@
+#!/usr/bin/env zsh
+# -------------------------------------------------------------------------------------------------
+# Copyright (c) 2010-2011 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
+# -------------------------------------------------------------------------------------------------
+
+BUFFER=": \$'*'"
+
+expected_region_highlight=(
+  "3 6 $ZSH_HIGHLIGHT_STYLES[dollar-quoted-argument]" # $'*' - not a glob
+)