#!/bin/bash

## Defaults
tiles=2x9
optimize=5
dir=.
output=.
name="sprite"

while getopts t:o:d:n:out: opt; do
  case $opt in
    t)
      tiles=$OPTARG
      ;;
    o)
      optimize=$OPTARG
      ;;
    d)
      dir=${OPTARG%/}
      ;;
    n)
      name=$OPTARG
      ;;
    out)
      output=${OPTARG%/}
      ;;
    esac
done

# take all images and convert it to sprites
echo "Converting images to sprites in $tiles grid"
echo "Saving to $output/$name{xxxxxx}.png"
montage -tile $tiles -mode concatenate -background transparent "$dir/*.*" $output/$name%05d.png > /dev/null 2>&1
echo "-- Sprites converted --"

# Optimize images
echo "Compressing sprites with optimization $optimize"
optipng -o$optimize $output/*.png > /dev/null 2>&1
echo "-- Sprites optimized --"

echo "Done, happy coding!"