#!/usr/bin/env python3

import re
import sys

exit_code = 0

copyright_pat = re.compile(
    r"See the file \"COPYING\" in the main distribution directory for copyright."
)


def match_line(line):
    m = copyright_pat.search(line)
    if m is not None:
        return True

    return False


for f in sys.argv[1:]:
    has_license_header = False
    with open(f) as fp:
        for line in fp:
            line = line.strip()
            if has_license_header := match_line(line):
                break

    if not has_license_header:
        print(f"{f}:does not seem to contain a license header", file=sys.stderr)
        exit_code = 1

sys.exit(exit_code)