I created a wrapper script that provides command line interface that subversion expects, and converts it to diffmerge command line, with some nice additions.
As a starting point for this script I used somebody's else script that was integrating with kdiff3 or some other tool, and than heavily modified it until it was different implementation of the same idea.
Ok, to use it you will have to modify file ~/.subversion/config, you will see there 2 entries for 2-way diff and 3-way diff, mention same wrapper script for both.
Script was tested to work on Ubuntu 7.04 Fiesty and 7.10 Gutsy.
I just started to use it with Mac OS X 10.5 Leopard and it seems to work fine.
Windows users, of course, are out of luck, but maybe with cygwin and good dose of magic this will work too.
Hope that this script will be useful to others just as it is useful for me.
Usual disclaimer: this script is a work in progress and there is some chance that it may set your computer on fire. Take your chances
