README.md

PowerShell:

git init; ni -ItemType SymbolicLink -Target "prepare-commit-msg" .git\hooks\prepare-commit-msg

Bash:

curl -Lo .git/hooks/prepare-commit-msg https://gist.github.com/
chmod +x .git/hooks/prepare-commit-msg

prepare-commit-msg

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

"""
Automatically Prefixing Git Commit Messages with an Issue Number From the Current Branch Name
https://andy-carter.com/blog/automating-git-commit-messages-with-git-hooks
"""

import sys, re
from subprocess import check_output

emoji_map = {
    'build': '📦',
    'ci': '🍬',
    'docs': '📃',
    'feat': '🔮',
    'fix': '🩺',
    'perf': '🦾',
    'refactor': '🧹',
    'style': '💅',
    'test': '🧪',
    'new': '🎀'
}

commit_msg_filepath = sys.argv[1]

# branch = check_output(['git', 'symbolic-ref', '--short', 'HEAD']).strip()
# regex = '(feature|hotfix)/(\w+-\d+)'
# if re.match(regex, branch):
#     issue = re.match(regex, branch).group(2)
#     with open(commit_msg_filepath, 'r+') as fh:
#         commit_msg = fh.read()
#         fh.seek(0, 0)
#         fh.write('[%s] %s' % (issue, commit_msg))
# elif branch != 'master' and branch != 'dev':
#     print 'Incorrect branch name'
#     sys.exit(1)

with open(commit_msg_filepath, 'r+', encoding='utf-8') as f:
    commit_msg = f.read()
    prefix = commit_msg.split(' ')[0].strip()
    if prefix in emoji_map.values():
        sys.exit(0)
    if not prefix in emoji_map:
        print('Prefix must be in:', ', '.join(list(emoji_map.keys())))
        sys.exit(1)
    emoji = emoji_map[prefix]
    commit_msg = commit_msg.replace(prefix, emoji)
    if prefix == 'new':
        commit_msg = emoji + ' hello world'
    commit_msg = commit_msg.strip()
    commit_msg += '\n'

with open(commit_msg_filepath, 'wb') as f:
    f.write(commit_msg.encode('utf-8'))