Shell script to convert all files in directory to webp, with default params, or standard cwebp params passed from command.

#!/bin/bash

PARAMS=('-m 6 -q 70 -mt -af -progress')

if [ $# -ne 0 ]; then
	PARAMS=$@;
fi

cd $(pwd)

shopt -s globstar nullglob nocaseglob extglob

To fix problems with globstar(especially on MacOS), use this gist.