.git_hooks_pre-commit

#!/usr/bin/env python3.4

"""Git pre-commit hook"""

import os
import subprocess
import sys


def run_linter(cmd, files):
    return subprocess.check_output(cmd + files,
        stderr=subprocess.STDOUT, universal_newlines=True)


def lint_files(changed_files):
    py_files = [file for file in changed_files if file.endswith('.py')]
    if py_files:
        run_linter(['flake8'], py_files)
        run_linter(['isort', '-c'], py_files)


if __name__ == "__main__":
    os.chdir(os.path.join(os.path.dirname(__file__), '..', '..'))
    changed_files = subprocess.check_output(
        'git diff --cached --name-only --diff-filter=ACM',
        shell=True, universal_newlines=True)
    changed_files = [file.strip() for file in changed_files.splitlines()]

    try:
        lint_files(changed_files)
    except subprocess.CalledProcessError as exc:
        print('Quality check failed:', file=sys.stderr)
        print(' '.join(exc.cmd), file=sys.stderr)
        if exc.output:
            print('\t', '\n\t'.join(exc.output.splitlines()), sep='', file=sys.stderr)
        sys.exit(1)