prepare-commit-msg

#!/usr/bin/env python
"""
To enable save as /yourproject/.git/hooks/prepare-commit-msg and make executable: chmod +rx prepare-commit-msg
"""
import sys
from subprocess import check_output


def get_ticket_number():
    branch_name = check_output(['git', 'rev-parse', '--abbrev-ref', 'HEAD'])
    return branch_name.split('-')[1]


def prepend_to_file(marker):
    with open(sys.argv[1], 'r') as message_file:
        lines = message_file.readlines()
        lines[0] = marker + lines[0]
    with open(sys.argv[1], 'w') as message_file:
        message_file.write(''.join(lines))

if __name__ == '__main__':
    marker = '\n\n#[touch:%s]' % get_ticket_number()
    prepend_to_file(marker)