We've been doing some wholesale PEP 8 reformatting over in the pygr project and we're trying to figure out how to review the changes to make sure nothing inadvertently got broken. Most of the changes are in spacing and line breaks, not in variable names, so I think what we really want is a whitespace-ignoring diff utility. That's not that difficult to find -- except that we're coding in Python, so relative whitespace indentation levels are significant!

Any suggestions for tools that could help?

I've tried several approaches based on tokenizing and using ASTs, but I'm not that clever. I'm going to take another look at processing two token streams, and if that doesn't work, I think 2to3 may hold the key...

--titus