"""Photo Renamer 1.0: renames photos to their date taken, e.g. 2026-11-08_0912.jpg (a demo sample)."""
import os
import sys
import time


def main(folder):
    for name in sorted(os.listdir(folder)):
        path = os.path.join(folder, name)
        stamp = time.strftime('%Y-%m-%d_%H%M', time.localtime(os.path.getmtime(path)))
        print(name, '->', stamp + os.path.splitext(name)[1].lower())


if __name__ == '__main__':
    main(sys.argv[1] if len(sys.argv) > 1 else '.')