png -> icns

make-icns

if [ $# -ne 1 ]; then
  echo "Usage: make-icns icon.png"
  exit 1
fi

IMAGE=$1
OUT=`basename ${IMAGE%\.*}`.iconset

mkdir $OUT
sizes=(16 32 128 256 512)
for size in ${sizes[@]}; do
  let "double = $size * 2"
  sips -z $size $size $IMAGE --out $OUT/icon_${size}x${size}.png > /dev/null
  sips -z $double $double $IMAGE --out $OUT/icon_${size}x${size}@2x.png > /dev/null
done
iconutil -c icns $OUT
rm -r $OUT