#!/usr/bin/env python3

from re import sub as re_sub
from glob import glob
from os import remove as os_remove
from os.path import isdir as path_isdir, isfile as path_isfile, abspath
from shutil import rmtree

GITIGNORE_PATH = "./.gitignore"
DRY_RUN = False

remove_comments = lambda s: re_sub(r"(?<!\\)#.*$", "", s).replace(r"\#", "#")


def read_gitignore():
    res = ""
    with open(GITIGNORE_PATH, "r", encoding="utf-8-sig") as gitignore_file:
        res = gitignore_file.read().splitlines()
    return res


def delete(file_path: str):
    is_dir = path_isdir(file_path)
    is_file = path_isfile(file_path)

    if not (is_dir or is_file):
        return

    display_file_path = abspath(file_path)
    if is_dir:
        print("Removing directory", display_file_path)
    elif is_file:
        print("Removing file", display_file_path)

    if DRY_RUN:
        return

    if is_dir:
        rmtree(file_path, ignore_errors=True)
    elif is_file:
        os_remove(file_path)


def extend_wildcards(patterns: list):
    res = []
    for pattern in patterns:
        processed_line = remove_comments(pattern).strip()

        if processed_line.startswith("!"):
            exception_pattern = processed_line[1:]
            exceptions = glob(exception_pattern, recursive=True)
            res = [path for path in res if path not in exceptions]
        else:
            res.extend(glob(processed_line, recursive=True))

    return res


def clean_gitignored_files():
    for file_path in extend_wildcards(read_gitignore()):
        delete(file_path)


if __name__ == "__main__":
    clean_gitignored_files()