Validate the length of my commit's message using python

commit-msg

#!/bin/sh

# put this file here: .git/hooks/commit-msg

exec < /dev/tty
.git/hooks/validate-commit.py $1

validate-commit.py

#!python

# the path to your python.exe

import sys, os

message_file = sys.argv[1]


with open(message_file) as fp:
    for i, line in enumerate(fp):
        if i == 0 and len(line) > 50:
            print('The first line of your commit should have less than 50 chars. Got {}.'.format(len(line)))
            sys.exit(1)
        elif len(line) > 72:
            print('Your lines shouldn\'t have more than 72 chars. Got {}.'.format(len(line)))
            sys.exit(1)