Added colordiff plugin.

plugins/colordiff/colordiff.plugin.zsh

@@ -0,0 +1,22 @@
+#!/bin/zsh
+
+# This file is part of xals' zsh utils.
+#
+# xals' zsh utils is free software: you can redistribute it and/or
+# modify it under the terms of the GNU General Public License as
+# published by the Free Software Foundation, either version 3 of the
+# License, or (at your option) any later version.
+#
+# xals' zsh utils is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with xals' zsh utils.  If not, see
+# <http://www.gnu.org/licenses/>.
+
+if [ -x "$(which colordiff)" ]; then
+    alias diff=colordiff
+fi
+