macroing for dummies ;) (no, I'm not saying you're dummy, it's just a joke on the book serie :)
open a random file (don't create a new file, otherwise it'll ask for the file name when saving and we don't want it to happen) automation -> start macro recording edit -> find and replace (as in the previous message) file -> save automation -> stop macro recording automation -> save scratch macro name it whatever you want ;) then focus the "key equivalent" field and press cmd+S go to the "scope" field and insert "source" if you only want it to be applied on source code (vs. "normal" text files)
and I think we should call this macro "hurt goblins".
hth
domenico