import argparse
import os
import sys


# parse_args: function definition for ScanSlicer behavior.
def parse_args(argv=None):
    parser = argparse.ArgumentParser(
        prog="scanslicer",
        description="ScanSlicer Qt UI (Wayland/X11)",
    )
    parser.add_argument(
        "path",
        nargs="?",
        help="Optional input directory containing images",
    )
    parser.add_argument(
        "--backend",
        choices=("auto", "wayland", "x11"),
        default="auto",
        help="Display backend selection (default: auto)",
    )
    return parser.parse_args(argv)