hg_hooks.py

#!/usr/bin/python
from mercurial import util
import re

def check_references(*args, **kwargs):
    """
    Checks that commit message contains a reference to or closes an issue.
    Useful when using Redmine.

    Usage in .hgrc:
        [hooks]
        pretxncommit = python:/path/to/this/file.py:check_references
    """
    repo = kwargs["repo"]
    node_id = kwargs["node"]
    changeset = repo[node_id]
    description =changeset.description()

    DESCRIPTION_CHECKS = (
        "this references #\d+", "this closes #\d+",
    )

    lets_commit = False
    for regexp in DESCRIPTION_CHECKS:
        if re.search(regexp, description, re.I):
            # message is ok, let's commit!
            lets_commit = True
            break

    if lets_commit:
        return False

    # this will rollback the changeset 
    raise util.Abort("Please reference some issue using "\
        "'This references #<issue>' or close it using 'This closes #<issue>'.")