In February 2008, [:mpm:Matt Mackall] contributed a new [:Merge:merge] tool configuration feature into the Mercurial main source code repository.
"[http://selenic.com/repo/hg/rev/5af5f0f9d724 merge: allow smarter tool configuration]" in [http://selenic.com/repo/hg/shortlog main Mercurial repository] (changesets starting with 5af5f0f9d724)
"[http://selenic.com/pipermail/mercurial/2008-February/016923.html New merge tool system in mainline]", posting by Matt Mackall, Feb 3, 2008, [http://selenic.com/pipermail/mercurial/ Mercurial mailing list]
Note that — as of February 12, 2008 — this is an upcoming feature, not yet contained in the current 0.9.5 release of Mercurial. This feature is expected for release 1.0.
See also: [:WhatsNew], [:MergeProgram], [:.hgrc]