plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%E3%83%97%E3%83%AD%E3%82%B0%E3%83%A9%E3%83%9F%E3%83%B3%E3%82%B0%E7%94%A8%E8%AA%9E
plugin=diff is not implemented.