would like to compare current file to same file name in another directory

[slestak]

I have two hg repos, one in a test env and another in a live env. Comparing to head is fine, but a lot of times I want to compare my current buffer to the same file in the other account.

I guess I would phrase it as:

When editing "/ud/TEST/foo.txt" and hit binding, diff to "/ud/LIVE/foo.txt" and vice versa. When in LIVE, compare to TEST. I would not want to replace the ability to compare to repo, just in addition to.