png-webp-mac.py

#  brew install webp
# then run following

import os
import subprocess
import argparse

def convert_png_to_webp(directory):
    """
    Converts PNG images in a directory to WebP format.

    Args:
        directory: The directory containing the PNG images.
    """

    if not os.path.isdir(directory):
        print(f"Error: '{directory}' is not a valid directory.")
        return

    for filename in os.listdir(directory):
        if filename.lower().endswith(".png"):
            input_path = os.path.join(directory, filename)
            base, ext = os.path.splitext(filename)
            output_path = os.path.join(directory, f"{base}.webp")

            try:
                # Construct the command, crucial for error handling
                command = ["cwebp", input_path, "-o", output_path]


                # Use subprocess.run for better error handling and output capture:
                result = subprocess.run(command, capture_output=True, text=True, check=True)
                print(f"Converted {filename} to {output_path}")
            except FileNotFoundError:
                print(f"Error: cwebp not found in your system's PATH. Please ensure cwebp is installed and in your PATH.")
                return 
            except subprocess.CalledProcessError as e:
                print(f"Error converting {filename}: {e.stderr}")




if __name__ == "__main__":
    parser = argparse.ArgumentParser(description="Convert PNG images to WebP in a directory.")
    parser.add_argument("directory", help="The directory containing PNG images.")
    args = parser.parse_args()

    convert_png_to_webp(args.directory)