import argparse
import csv
import gzip
import sys


def domains(path):
    with gzip.open(path, "rt", encoding="utf-8") as source:
        for line in source:
            domain = line.strip().lower().rstrip(".")
            if domain:
                yield domain

parser = argparse.ArgumentParser(description="Find domain names matching topic keywords")
parser.add_argument("file")
parser.add_argument("--keywords", nargs="+", required=True)
args = parser.parse_args()
writer = csv.writer(sys.stdout)
writer.writerow(["domain", "topic_matches"])
for domain in domains(args.file):
    name = domain.rsplit(".", 1)[0]
    matches = [word for word in args.keywords if word.lower() in name]
    if matches:
        writer.writerow([domain, ";".join(matches)])