Does any one know of a good file comparator for RoR

Hi,
Does any one know of a good file comparator used in RoR world. Though there are many other lang/framework based source code comparator, i did not find one for RoR specific when i googled it. I use easy eclipse and scite alternately for programming in RoR. So if they have any add-on/plugin u guys/gals know of pls do tell

-ciao
Arjun