Git message format git hook

validate-style.py

#!/usr/bin/python

import sys, os
from subprocess import call

message_file = sys.argv[1]

def check_format_rules(lineno, line):
    real_lineno = lineno + 1
    if lineno == 0:
        if len(line) > 50:
            return "Error %d: First line should be less than 50 characters " \
                    "in length." % (real_lineno,)
    if lineno == 1:
        if line:
            return "Error %d: Second line should be empty." % (real_lineno,)
    if not line.startswith('#'):
        if len(line) > 72:
            return "Error %d: No line should be over 72 characters long." % (
                    real_lineno,)
    return False


commit_msg = list()
errors = list()
with open(message_file) as commit_fd:
    for lineno, line in enumerate(commit_fd):
        stripped_line = line.strip()
        commit_msg.append(line)
        e = check_format_rules(lineno, stripped_line)
        if e:
            errors.append(e)
if errors:
    for error in errors:
        print('%s\n' % (error,))
    sys.exit(1)