insert-issue-number.hook

#!/usr/bin/env python
# Based on a hook from dzone.com
# Source: https://dzone.com/articles/an-in-depth-look-at-git-hooks
#
# Inserts issue number to beginning of the commit message.
#
# Requirements: 
#   * Python
#
# To enable this hook, rename this file to "prepare-commit-msg".

import sys, os, re
from subprocess import check_output
# Collect the parameters
commit_msg_filepath = sys.argv[1]
if len(sys.argv) > 2:
commit_type = sys.argv[2]
else:
commit_type = ''
if len(sys.argv) > 3:
commit_hash = sys.argv[3]
else:
commit_hash = ''
print "prepare-commit-msg: File: %s\nType: %s\nHash: %s" % (commit_msg_filepath, commit_type, commit_hash)
# Figure out which branch we're on
branch = check_output(['git', 'symbolic-ref', '--short', 'HEAD']).strip()
print "prepare-commit-msg: On branch '%s'" % branch
# Populate the commit message with the issue #, if there is one
if branch.startswith('issue-'):
print "prepare-commit-msg: Oh hey, it's an issue branch."
result = re.match('issue-(.*)', branch)
issue_number = result.group(1)
with open(commit_msg_filepath, 'r+') as f:
content = f.read()
f.seek(0, 0)
f.write("ISSUE-%s %s" % (issue_number, content))