PEP8_PyUnit_pre-commit_hook

#!/usr/bin/env python3
#
# A pre-commit hook to verify PEP8 conformity using flake8
# and to run all available unit tests

import subprocess
from subprocess import CalledProcessError
import sys
import os
import glob

# Try to read the GIT_DIR envvar, which is set if this is being called as a git pre-commit hook.
try:
    path, _ = os.path.split(os.path.abspath(os.environ['GIT_DIR']))
# If it is not set, a KeyError is raised, which is taken as if this is invoked from the command line, using the cwd instead.
# This requires calling this script from the correct directory!
except KeyError:
    path = os.getcwd()

print("Checking " + path)
try:
    subprocess.check_call(["flake8", path])
except CalledProcessError as e:
    print("Found PEP8 non-conformities! Aborting commit...")
    sys.exit(1)

for test_file in glob.glob(path + "/tests/*_tests.py"):
    print("Running " + test_file)
    if subprocess.call(["python3", "-m", "unittest", test_file], stdin=None, stdout=None, stderr=subprocess.DEVNULL) != 0:
        print("Unit tests failed in " + test_file + "! Aborting commit...")
        sys.exit(1)

print("Style check and unit tests successful, committing!")