commit-msg file for prefix by coding

commit-msg

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

from sys import argv, stderr
from string import whitespace
from optparse import OptionParser

PREFIXES = (
    'feat',
    'fix',
    'docs',
    'style',
    'refactor',
    'pref',
    'test',
    'chore')
PREFIX_USAGES = (
    'A new feature',
    'A bug fix',
    'Documentation only changes',
    'Changes that do not affect the meaning of the code'
    ' (white-space, formatting, missing semi-colons, etc)',
    'A code change that neither fixes a bug nor adds a feature',
    'A code change that improves performance',
    'Adding missing or correcting existing tests',
    'Changes to the build process or auxiliary tools and libraries such as documentation generation'
)


def get_prefix(message):
    return list(filter(
        lambda s: not s.startswith("#") and s not in whitespace,
        message.split('\n')))[0].split()[0].lower()


def get_prefix_list():
    return map(lambda s: s + ":", PREFIXES)


def get_parser():
    parser = OptionParser()
    parser.add_option(
        '--list', '-l',
        action='store_true',
        default=False,
        dest='show_list',
        help='show all prefixes')
    return parser


def show_prefix_usage():
    for prefix, usage in zip(PREFIXES, PREFIX_USAGES):
        print("{}: {}".format(prefix, usage))


opts, args = get_parser().parse_args()
if opts.show_list:
    show_prefix_usage()
else:
    with open(argv[1]) as f:
        message = f.read()
    prefix = get_prefix(message)
    if prefix not in get_prefix_list():
        stderr.write(
            'There is no prefix.\n')
        exit(1)