#!/usr/bin/env python

import glob
import os
import sys

os.environ['PYFLAKES_NODOCTEST'] = '1'

# pep8.py uses sys.argv to find setup.cfg
sys.argv = [os.path.join(os.path.dirname(__file__), os.pardir, os.pardir)]

# git usurbs your bin path for hooks and will always run system python
if 'VIRTUAL_ENV' in os.environ:
    site_packages = glob.glob(
        '%s/lib/*/site-packages' % os.environ['VIRTUAL_ENV'])[0]
    sys.path.insert(0, site_packages)


def py_lint(files_modified):
    from flake8.main import DEFAULT_CONFIG
    from flake8.engine import get_style_guide

    # remove non-py files and files which no longer exist
    files_modified = [fn for fn in files_modified if fn.endswith(".py")]

    flake8_style = get_style_guide(parse_argv=True, config_file=DEFAULT_CONFIG)
    report = flake8_style.check_files(files_modified)

    return report.total_errors != 0


def main():
    from flake8.hooks import run

    gitcmd = "git diff-index --cached --name-only HEAD"

    _, files_modified, _ = run(gitcmd)

    files_modified = [fn for fn in files_modified if os.path.exists(fn)]
    files_modified = filter(lambda x: os.path.exists(x), files_modified)

    if py_lint(files_modified):
        return 1
    else:
        return 0

if __name__ == '__main__':
    sys.exit(main())
