Git flow commit message generator

gfcommit.py

#!/usr/bin/env python3

# brew install pygit2
# pip3 install pygit2

from pygit2 import Repository
import sys
import re

regex = r"^([a-z]{1,5})/([A-Z]{1,5}-[0-9]{1,4})"

def main():
    repo = Repository('.')
    branch_name = repo.head.shorthand

    message = sys.argv[1:]
    if not message:
        raise Exception(f'Empty commit message. Usage: {sys.argv[0]} commit message...')
    message = ' '.join(message)

    pattern = re.compile(regex) 
    if not pattern.match(branch_name):
        raise Exception(f'Branch name "{branch_name}" is not valid!')
    branch_type, jira_ticket = pattern.findall(branch_name)[0]

    status: Dict[str, int] = repo.status()
    if not status:
        raise Exception("Tree is empty, nothing to commit")

    commit_msg = f"{branch_type}({jira_ticket}): {message}" 
    tree = repo.index.write_tree()
    parent, ref = repo.resolve_refish(refish=repo.head.name)
    repo.create_commit(
        ref.name,
        repo.default_signature,
        repo.default_signature,
        commit_msg, 
        tree,
        [parent.oid],
    )
    print(f'Created commit: "{commit_msg}"')
try:
    main()
except Exception as err:
    print(f'Error: {err}')
    sys.exit(1)