Shell scripts for recursively compressing files to PNG/WebP

png_compress

#!/usr/bin/env sh

compress() {
    while [ "$1" ]; do
        if [ -d "$1" ]; then
            compress "$1"/*
        else
            zopflipng -m -y $1 $1
        fi
        shift
    done
}

compress *

webp_compress

#!/usr/bin/env sh

compress() {
    while [ "$1" ]; do
        if [ -d "$1" ]; then
            compress "$1"/*
        else
            cwebp -af -mt -q 100 -lossless "$1" -o "${1%.*}.webp"
            if [ "$1" != "${1%.*}.webp" ] && [ -f "${1%.*}.webp" ]; then
              rm "$1"
            fi
        fi
        shift
    done
}

compress *