Git commit message spell checker

commit-msg

#!/usr/bin/env python

import os
import shutil
import subprocess
import sys

try:
    aspell_path = shutil.which('aspell')
except AttributeError:
    path = os.environ['PATH']
    paths = path.split(os.pathsep)
    aspell_path = None
    for p in paths:
        test_path = '{0}/{1}'.format(p, 'aspell')
        if os.path.isfile(test_path):
            aspell_path = test_path
            break
ok_words_path = '/Users/sdoran/.git/extra-words.txt'
if not aspell_path:
    print("aspell not found")
    sys.exit(1)

# Read in list of non-dictionary words that are ok
command = [aspell_path, 'list']
if os.path.isfile(ok_words_path):
    with open(ok_words_path, 'rb') as f:
        ok_words = f.readlines()
        ok_words = [word.rstrip(b'\n') for word in ok_words]

# Spell check the commit message
with open(sys.argv[1], 'rb') as f:
    p = subprocess.Popen(command, stdin=f, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    stdout = p.communicate()[0]

# Filter out extra words from the list of spelling mistakes
mispelled_word_set = {w.decode('utf-8') for w in stdout.splitlines()}
mistakes = mispelled_word_set.difference(ok_words)

# If anything is left, we have mistakes
if len(mistakes) > 0:
    print("Found the following spelling errors:\n")
    for word in mistakes:
        print('{0}'.format(word))
    sys.exit(1)