#!/usr/bin/env python3
"""show dirty git repos"""

from __future__ import division, print_function

from colorama import Fore
from pathlib import Path

import contextlib
import os
import re
import subprocess

import click


# TODO config file (and defaults here)
IGNORES = [
        r"\.sync",
        r"\.git/modules",  # XXX check this again
        r"\.local/share/containers/storage",
]


def git_directories(startdir) -> Path:
    for dirpath, dirnames, _ in os.walk(startdir):
        if any(re.search(ignore, dirpath) for ignore in IGNORES):
            continue
        if set(['info', 'objects', 'refs']).issubset(set(dirnames)):
            yield Path(dirpath)


@contextlib.contextmanager
def working_directory(directory: Path):
    saved_cwd = os.getcwd()
    os.chdir(directory)
    yield
    os.chdir(saved_cwd)


@click.command
@click.argument('topdirs',  nargs=-1, type=click.Path(exists=True, file_okay=False,
                                                      path_type=Path))
@click.option('-l', '--list', 'list_', is_flag=True, default=False,
              help='Just list the dirty directories')
def search_dirty(topdirs, list_):
    """Search for dirty git working directories in TOPDIRS"""
    if len(topdirs) == 0:
        topdirs = [Path(".")]

    for topdir in topdirs:
        for git_directory in git_directories(topdir):
            # technically,we could have a different GIT_DIR than ".git", but this script
            # assumes ".git".
            if git_directory.parts[-1] != ".git":
                continue
            work_tree_directory = git_directory.parent

            with working_directory(work_tree_directory):
                try:
                    out = subprocess.check_output(['git', 'status', '-s'], stderr=subprocess.STDOUT)
                    if len(out) > 0:
                        if not list_:
                            print('== {}\n{}'.format(work_tree_directory, out.decode('utf-8')))
                        else:
                            print(work_tree_directory)
                except subprocess.CalledProcessError as e:
                    print((Fore.RED + 'git status is unhappy with {}' + Fore.RESET)
                          .format(work_tree_directory))
                    print(e.output)


if __name__ == '__main__':
    search_dirty()