Fix copyright.py when a repo has no commits

import re

import sys

import time

from functools import lru_cache

from pathlib import Path

from subprocess import DEVNULL

from subprocess import PIPE

from subprocess import run

from typing import Dict

	return (Path(p.decode()) for p in paths.split(b'\x00') if p != b'')

@lru_cache(1)

def has_commits() -> bool:

	"""

	Return whether the repository has any commits yet

	"""

	cmd = ['git', 'rev-parse', '--verify', '-q', 'HEAD']

	proc = run(cmd, stdout=DEVNULL)

	return proc.returncode == 0

def cli_parser() -> argparse.ArgumentParser:

	"""

	Return an argparse parser

	year = time.strftime('%Y')

	years = {path: year for path in paths if path.is_file()}

	if has_commits():

		years.update(get_file_years(paths))

		years.update((path, year) for path in get_changed(paths))