[fix] enable audiotools CLI format listing without required arguments

        f"-{ps}",

        f"--{p}",

        dest=f"{p}put",

        required=True,

        type=Path,

        help="Path to *.{wav, pcm, raw} file or directory",

    )

    group.add_argument(

        f"-{ps}f",

        f"--{p}_fmt",

        required=input,

        type=str,

        help="Audio format (use -l, --list for a list / -L, --long for a detailed list)",

        default=None,

    )

def get_args():

def get_argparser():

    parser = argparse.ArgumentParser(

        description="Audiotools: Convert/Manipulate spatial audio files."

    )

        action="store_true",

    )

    return parser.parse_args()

    return parser

def main():

    args = get_args()

    parser = get_argparser()

    args = parser.parse_args()

    # special arguments for listing formats

    if args.list is True or args.long is True:

        for fmt in AUDIO_FORMATS:

            if args.long:

                print(", ".join(fmt.keys()))

        exit()

    # validate required arguments

    if args.input is None or args.in_fmt is None or args.output is None:

        parser.print_usage()

        raise SystemExit("the following arguments are required: -i/--in, -if/--in_fmt, -o/--out")

    elif args.input is not None:

        if not args.out_fs:

            args.out_fs = args.in_fs

        if len(in_files) == 1 and args.input.is_file():

            out_files = [args.output]

        else:

            args.output.mkdir(exist_ok=True)

            # input was a dir so output should be a dir too

            if args.output.is_file():

                raise NotADirectoryError(f"Input directory '{args.input}' specified with file output to '{args.output}' - please specify an output directory instead")

            if not args.output.exists():

                args.output.mkdir()

                print(f"Created output directory {args.output}")

            out_files = [args.output.joinpath(i.name) for i in in_files]

        # Multiprocessing