Script to convert png to icns

png2icns

#!/usr/bin/env bash

# Author: Artem Butusov <art.sormy@gmail.com>
# Version: 1.0
# Idea: https://stackoverflow.com/questions/12306223/how-to-manually-create-icns-files-using-iconutil

source="$1"

if [ -z "$source" ]; then
    echo "Usage: png2icns <file.png>"
    exit 0
fi

if [ ! -e "$source" ]; then
    echo "Unable to find file: ${source}"
    exit 1
fi

if [ "${source: -4}" != ".png" ]; then
    echo "This script could accept only png files with .png extension"
    exit 2
fi

iconset="$(basename "${source}" ".png").iconset"

mkdir "${iconset}"

sips -z 16 16     "${source}" --out "${iconset}/icon_16x16.png"
sips -z 32 32     "${source}" --out "${iconset}/icon_16x16@2x.png"
sips -z 32 32     "${source}" --out "${iconset}/icon_32x32.png"
sips -z 64 64     "${source}" --out "${iconset}/icon_32x32@2x.png"
sips -z 128 128   "${source}" --out "${iconset}/icon_128x128.png"
sips -z 256 256   "${source}" --out "${iconset}/icon_128x128@2x.png"
sips -z 256 256   "${source}" --out "${iconset}/icon_256x256.png"
sips -z 512 512   "${source}" --out "${iconset}/icon_256x256@2x.png"
sips -z 512 512   "${source}" --out "${iconset}/icon_512x512.png"
sips -z 1024 1024 "${source}" --out "${iconset}/icon_512x512@2x.png"

iconutil -c icns "$iconset"

rm -R "$iconset"