#!/bin/bash

# ICNS from PNG

if [[ ! $2 ]]; then
    cat<<EOF
Usage:
    ${0##*/} <input png e.g. "source.png"> <output name e.g. "MyApp">
EOF
    exit 1
fi
((err > 0)) && exit 1

mkdir $2.iconset
convert -background none -resize 16x16 -gravity center -extent 16x16     $1 $2.iconset/icon_16x16.png;
convert -background none -resize 32x32 -gravity center -extent 32x32     $1 $2.iconset/icon_16x16@2x.png;
convert -background none -resize 32x32 -gravity center -extent 32x32     $1 $2.iconset/icon_32x32.png;
convert -background none -resize 64x64 -gravity center -extent 64x64     $1 $2.iconset/icon_32x32@2x.png;
convert -background none -resize 64x64 -gravity center -extent 64x64     $1 $2.iconset/icon_64x64.png;
convert -background none -resize 128x128 -gravity center -extent 128x128   $1 $2.iconset/icon_64x64@2x.png;
convert -background none -resize 128x128 -gravity center -extent 128x128   $1 $2.iconset/icon_128x128.png;
convert -background none -resize 256x256 -gravity center -extent 256x256   $1 $2.iconset/icon_128x128@2x.png;
convert -background none -resize 256x256 -gravity center -extent 256x256   $1 $2.iconset/icon_256x256.png;
convert -background none -resize 512x512 -gravity center -extent 512x512   $1 $2.iconset/icon_256x256@2x.png;
convert -background none -resize 512x512 -gravity center -extent 512x512   $1 $2.iconset/icon_512x512.png;
convert -background none -resize 1024x1024 -gravity center -extent 1024x1024 $1 $2.iconset/icon_512x512@2x.png;
iconutil --convert icns $2.iconset
rm -R $2.iconset