zsh script to replace all spaces and special characters in a file name for all files in the directory with dashes and make all letters lowercase removing the last dash in the file name

gistfile1.txt

#!/bin/zsh

# Iterate over files in the directory
for filename in *; do
    # Check if the filename is a regular file
    if [[ -f "$filename" ]]; then
        # Extract filename and extension
        base_filename=$(basename "$filename")
        extension="${base_filename##*.}"
        base_filename="${base_filename%.*}"

        # Replace spaces and special characters with dashes, and convert to lowercase
        new_base_filename=$(echo "$base_filename" | tr -s '[:space:]' '-' | tr -s '[:punct:]' '-' | tr '[:upper:]' '[:lower:]')

        # Remove trailing dashes
        new_base_filename=${new_base_filename%-}

        # Combine new filename with extension
        new_filename="${new_base_filename}.${extension}"

        # Rename the file
        mv "$filename" "$(dirname "$filename")/$new_filename"

        echo "File '$filename' renamed to '$new_filename'"
    fi
done