How to use p4merge as the merge/diff tool for Mercurial?

Question

Does anyone know how to setup Mercurial to use p4merge as the merge/diff tool on OS X 10.5?

Answer 1

I use the following bit of Python to launch p4merge and use it with git :

#!/usr/bin/python
import sys
import os

os.system('/Applications/p4merge.app/Contents/MacOS/p4merge "%s" "%s"' % (sys.argv[2], sys.argv[5]))

I'm not sure how mercurial looks to launch an external diff tool though ? Hopefully it's as simple as adjusting 2 & 5 in the above line to being the index of the arguments for 'checked in' and 'current working copy'.