#!/usr/bin/env bash
#
# Orignal source:
#   https://github.com/herrbischoff/awesome-osx-command-line/blob/master/functions.md#app-icons

if [[ -z "$@" ]]; then
  echo "Input file missing"
  exit 1
else
  filename=${1%.*}
  mkdir $filename.iconset
  sips -z 16 16   $1 --out $filename.iconset/icon_16x16.png
  sips -z 32 32   $1 --out $filename.iconset/icon_16x16@2x.png
  sips -z 32 32   $1 --out $filename.iconset/icon_32x32.png
  sips -z 64 64   $1 --out $filename.iconset/icon_32x32@2x.png
  sips -z 128 128 $1 --out $filename.iconset/icon_128x128.png
  sips -z 256 256 $1 --out $filename.iconset/icon_128x128@2x.png
  sips -z 256 256 $1 --out $filename.iconset/icon_256x256.png
  sips -z 512 512 $1 --out $filename.iconset/icon_256x256@2x.png
  sips -z 512 512 $1 --out $filename.iconset/icon_512x512.png
  cp $1 $filename.iconset/icon_512x512@2x.png
  iconutil -c icns $filename.iconset
  rm -r $filename.iconset
fi
