plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BC%EF%BC%83%2B%E8%A8%80%E8%AA%9E%E3%82%BB%E3%82%AF%E3%82%B7%E3%83%A7%E3%83%B3
plugin=diff is not implemented.