convertToIco

#!/bin/sh

# USAGE
# =====
# ./convertToIco <input.svg or input.png or input.ico> <output.ico> <square edge size (optional, defaults to 256 px)>
# Example:
# ./convertToIco ~/icon.png ~/Desktop/icon_converted.ico 16

# Exit the shell script on error immediately
set -e

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

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

# Arguments
SOURCE=$1
DEST=$2
SIZE=$3

# 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

if [ -z "${SIZE}" ]; then
	# Set default size to 256 px
	SIZE=256
fi

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

# Temp directory
TEMP_DIR=".convertToIco"
mkdir -p "${TEMP_DIR}"

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

# Check for file type
if [ "${SOURCE_EXT}" == "ico" ]; then
	cp "${SOURCE}" "${DEST}"
	exit 0
elif [ "${SOURCE_EXT}" == "svg" ] || [ "${SOURCE_EXT}" == "png" ]; then
	${CONVERT_TO_PNG} "${SOURCE}" "${TEMP_DIR}/${SOURCE_BASE}.png" "${SIZE}"
	convert "${TEMP_DIR}/${SOURCE_BASE}.png" "${DEST}"
else
	echo "SVG, PNG or ICO must be provided"
	exit 1
fi