plugin=diff is not implemented.
http://yellow.ribbon.to/~tuotehhou/index.php?%2BSL%2B%E3%83%87%E3%83%BC%E3%82%BF%E3%83%90%E3%82%A4%E3%83%B3%E3%83%87%E3%82%A3%E3%83%B3%E3%82%B0
plugin=diff is not implemented.