Precommit file using fabric to test and run PEP8 after commit files

precommit

#!/usr/bin/env python

import os
import re
import subprocess
import sys

modified_re = re.compile(r'^(\s[AM]+)\s+(?P<name>.*\.py)')


def get_staged_files():
    """Get all files staged for the current commit.
    """
    git = subprocess.Popen(['git', 'status', '--porcelain'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out,error = git.communicate()

    staged_files = modified_re.findall(out)
    return staged_files


def main():
    abort = False
    # Getting stage files
    staged_files = get_staged_files()
    # Stagging changed files
    subprocess.call(['git', 'stash', '-u', '--keep-index'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    
    print '========== Checking PEP8 =========='
    for filename in staged_files:
        proc = subprocess.Popen(['pep8', '--max-line-length=119', '--show-source', filename[1]],
                                stdout=subprocess.PIPE)
        output, _ = proc.communicate()
        # If pep8 still reports problems then abort this commit.
        if output:
            abort = True
            print '========= Found PEP8 ERROR =========='
            print output
	else:
            print 'PEP8 correct'
    
    # Run unit tests
    print '============== Running unit tests ============='
    proc = subprocess.Popen(['fab', 'test'], stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    out, error = proc.communicate()
    if 'FAILED' in error:
        print 'There are error in unit tests: {0}'.format(error)
        abort = True

    # Un-staging previously files
    subprocess.call(['git', 'stash', 'pop', '-q'], stdout=subprocess.PIPE)

    # Final result
    if abort:
        print '=============== ABORTING commit ==============='
        sys.exit(1)
    else:
        sys.exit(0)

if __name__ == '__main__':
    main()