Improve extdiff configuration. In addition to the old cmd.foo, opts.foo hgrc entries, allow a more simple alias = command [opts]... form. For example: [extdiff] cdiff = colordiff -uprN

#!/bin/sh

hg init a
echo a > a/a
hg --cwd a ci -A -m a
hg clone a b
echo b > b/b
hg --cwd b ci -A -m b
chmod 100 a/.hg/store
hg --cwd b push ../a
chmod 700 a/.hg/store