From de46d8583a513d067c5b9c7fa9e9f7516cc4c361 Mon Sep 17 00:00:00 2001
From: disarmer mk <disarmer.mk@gmail.com>
Date: Fri, 14 Oct 2016 23:38:21 +0300
Subject: [PATCH] regexp highlighter

---
 docs/highlighters/regexp.md                | 24 ++++++++++
 highlighters/regexp/README.md              |  1 +
 highlighters/regexp/regexp-highlighter.zsh | 56 ++++++++++++++++++++++
 3 files changed, 81 insertions(+)
 create mode 100644 docs/highlighters/regexp.md
 create mode 120000 highlighters/regexp/README.md
 create mode 100644 highlighters/regexp/regexp-highlighter.zsh

diff --git a/docs/highlighters/regexp.md b/docs/highlighters/regexp.md
new file mode 100644
index 0000000..83a4b1d
--- /dev/null
+++ b/docs/highlighters/regexp.md
@@ -0,0 +1,24 @@
+zsh-syntax-highlighting / highlighters / regexp
+------------------------------------------------
+
+This is the `regexp` highlighter, that highlights user-defined regular expressions. It's similar to pattern highlighter, but allows more complex patterns.
+
+
+### How to tweak it
+
+To use this highlighter, associate regular expressions with styles in the
+`ZSH_HIGHLIGHT_REGEXP` associative array, for example in `~/.zshrc`:
+
+    ZSH_HIGHLIGHT_REGEXP+=('\bsudo\b' fg=123,bold)
+
+This will highlight "sudo" only if it's surrounded by word boundary, i.e. "sudo cmd", but not "sudoedit"
+
+The syntax for values is the same as the syntax of "types of highlighting" of
+the zsh builtin `$zle_highlight` array, which is documented in [the `zshzle(1)`
+manual page][zshzle-Character-Highlighting].
+
+See also: [regular expressions on wikipedia][regexp-wiki], zsh regexp operator `=~` in [zsh manual page][zsh-man-regexp]
+
+[zshzle-Character-Highlighting]: http://zsh.sourceforge.net/Doc/Release/Zsh-Line-Editor.html#Character-Highlighting
+[regexp-wiki]: https://en.wikipedia.org/wiki/Regular_expression
+[zsh-man-regexp]: http://zsh.sourceforge.net/Doc/Release/Conditional-Expressions.html#Conditional-Expressions
diff --git a/highlighters/regexp/README.md b/highlighters/regexp/README.md
new file mode 120000
index 0000000..9f2522d
--- /dev/null
+++ b/highlighters/regexp/README.md
@@ -0,0 +1 @@
+../../docs/highlighters/regexp.md
\ No newline at end of file
diff --git a/highlighters/regexp/regexp-highlighter.zsh b/highlighters/regexp/regexp-highlighter.zsh
new file mode 100644
index 0000000..52e0cbf
--- /dev/null
+++ b/highlighters/regexp/regexp-highlighter.zsh
@@ -0,0 +1,56 @@
+# -------------------------------------------------------------------------------------------------
+# 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
+# -------------------------------------------------------------------------------------------------
+
+
+# List of keyword and color pairs.
+typeset -gA ZSH_HIGHLIGHT_REGEXP
+
+# Whether the pattern highlighter should be called or not.
+_zsh_highlight_highlighter_regexp_predicate(){
+  _zsh_highlight_buffer_modified
+}
+
+# Pattern syntax highlighting function.
+_zsh_highlight_highlighter_regexp_paint(){
+  setopt localoptions extendedglob
+  local pattern
+  for pattern in ${(k)ZSH_HIGHLIGHT_REGEXP}; do
+    _zsh_highlight_regexp_highlighter_loop "$BUFFER" "$pattern"
+  done
+}
+_zsh_highlight_regexp_highlighter_loop(){
+  local buf="$1" pat="$2" OFFSET="$3"
+  local MATCH; integer MBEGIN MEND
+  while true;do
+    [[ "$buf" =~ "$pat" ]] || return;  
+    region_highlight+=("$((MBEGIN - 1 + OFFSET)) $((MEND + OFFSET)) $ZSH_HIGHLIGHT_REGEXP[$pat]")
+    buf="$buf[$(($MEND+1)),-1]"
+    OFFSET=$((MEND+OFFSET));
+  done
+}