#!/usr/bin/env python3
"""Write a copy of requirements.txt without the self-hosted packages.

Usage: filter_requirements.py <input> <output>
"""
import re
import sys

SKIP = {
	"lib-db-module",
	"lib-secret-manager",
	"lib-send-notifications",
	"simple-logger-handler",
	"lib-service-auth",
}

NAME_RE = re.compile(r"^\s*([A-Za-z0-9][A-Za-z0-9._-]*)")


def main(src: str, dst: str) -> None:
	skipped = []

	with open(src) as fin, open(dst, "w") as fout:
		for line in fin:
			match = NAME_RE.match(line)
			if match and match.group(1) in SKIP:
				skipped.append(match.group(1))
				continue
			fout.write(line)

	print(f"Skipped {len(skipped)} self-hosted package(s): {', '.join(skipped) or '-'}")


if __name__ == "__main__":
	if len(sys.argv) != 3:
		sys.exit(__doc__)
	main(sys.argv[1], sys.argv[2])