def main() -> None:
    """
    Command-line processor. See ``--help`` for details.
    """
    parser = ArgumentParser(
        description="Remove duplicate files"
    )
    parser.add_argument(
        "directory", nargs="+",
        help="Files and/or directories to check and remove duplicates from."
    )
    parser.add_argument(
        "--recursive", action="store_true",
        help="Recurse through any directories found"
    )
    parser.add_argument(
        "--dummy_run", action="store_true",
        help="Dummy run only; don't actually delete anything"
    )
    parser.add_argument(
        "--run_repeatedly", type=int,
        help="Run the tool repeatedly with a pause of <run_repeatedly> "
             "seconds between runs. (For this to work well,"
             "you should specify one or more DIRECTORIES in "
             "the 'filename' arguments, not files, and you will need the "
             "--recursive option.)"
    )
    parser.add_argument(
        "--verbose", action="store_true",
        help="Verbose output"
    )
    args = parser.parse_args()
    main_only_quicksetup_rootlogger(
        level=logging.DEBUG if args.verbose else logging.INFO)

    while True:
        deduplicate(args.directory,
                    recursive=args.recursive,
                    dummy_run=args.dummy_run)
        if args.run_repeatedly is None:
            break
        log.info("Sleeping for {} s...", args.run_repeatedly)
        sleep(args.run_repeatedly)