A script that can be called from hg hooks to update version.py.

theano/misc/hg_version_hook.sh

+#!/bin/sh
+# Script to update version.py in response to Mercurial hooks. This should
+# not appear in a release tarball.
+
+echo "Updating version.py..."
+sed -e "s/^hg_revision.*/hg_revision = '`expr substr $HG_NODE 1 12`'/" theano/version.py >theano/version.py.out && mv theano/version.py.out theano/version.py
+