convertToIcns

#!/bin/sh

# USAGE
# =====
# ./convertToIcns <input.svg or input.png> <output.icns>
# Example:
# ./convertToIcns ~/icon.png ~/Desktop/icon_converted.icns

# Exit the shell script on error immediately
set -e

# Check for dependency
# iconutil
type iconutil >/dev/null 2>&1 || { echo >&2 "Cannot find required iconutil executable"; exit 1; }

# Import script as variable
CONVERT_TO_PNG="${BASH_SOURCE%/*}/convertToPng"

# Arguments
SOURCE=$1
DEST=$2

# Check arguments
if [ -z "${SOURCE}" ]; then
	echo "No source image specified"
	exit 1
fi

if [ -z "${DEST}" ]; then
	echo "No destination specified"
	exit 1
fi

# File variables
SOURCE_NAME=$(basename "${SOURCE}")
SOURCE_EXT="${SOURCE_NAME##*.}"
SOURCE_BASE="${SOURCE_NAME%.*}"
ICONSET="${SOURCE_BASE}.iconset"

# Temp directory
TEMP_DIR=".convertToIcns"
mkdir -p "${TEMP_DIR}/${ICONSET}"

# Cleanup
function cleanUp() {
	rm -rf "${TEMP_DIR}"
}
trap cleanUp EXIT

# Check for file type
if [ "${SOURCE_EXT}" == "svg" ] || [ "${SOURCE_EXT}" == "png" ]; then
	${CONVERT_TO_PNG} "${SOURCE}" "${TEMP_DIR}/${ICONSET}/icon_16x16.png" 16
	${CONVERT_TO_PNG} "${SOURCE}" "${TEMP_DIR}/${ICONSET}/icon_16x16@2x.png" 32
	${CONVERT_TO_PNG} "${SOURCE}" "${TEMP_DIR}/${ICONSET}/icon_32x32.png" 32
	${CONVERT_TO_PNG} "${SOURCE}" "${TEMP_DIR}/${ICONSET}/icon_32x32@2x.png" 64
	${CONVERT_TO_PNG} "${SOURCE}" "${TEMP_DIR}/${ICONSET}/icon_128x128.png" 128
	${CONVERT_TO_PNG} "${SOURCE}" "${TEMP_DIR}/${ICONSET}/icon_128x128@2x.png" 256
	${CONVERT_TO_PNG} "${SOURCE}" "${TEMP_DIR}/${ICONSET}/icon_256x256.png" 256
	${CONVERT_TO_PNG} "${SOURCE}" "${TEMP_DIR}/${ICONSET}/icon_256x256@2x.png" 512
	${CONVERT_TO_PNG} "${SOURCE}" "${TEMP_DIR}/${ICONSET}/icon_512x512.png" 512
	${CONVERT_TO_PNG} "${SOURCE}" "${TEMP_DIR}/${ICONSET}/icon_512x512@2x.png" 1024
else
	echo "SVG or PNG must be provided"
	exit 1
fi

# Create an icns file from the iconset
iconutil -c icns "${TEMP_DIR}/${ICONSET}" -o "${DEST}"