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nativefier/bin/convertToPng

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#!/usr/bin/env bash
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# USAGE
# ./convertToPng <input png or ico> <outfilename>.png
# Example
# ./convertToPng ~/sample.ico ~/Desktop/converted.png
set -e
type convert >/dev/null 2>&1 || { echo >&2 "Cannot find required ImageMagick Convert executable"; exit 1; }
type identify >/dev/null 2>&1 || { echo >&2 "Cannot find required ImageMagick Identify executable"; exit 1; }
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# Parameters
SOURCE="$1"
DEST="$2"
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# Check source and destination arguments
if [ -z "${SOURCE}" ]; then
echo "No source image specified"
exit 1
fi
if [ -z "${DEST}" ]; then
echo "No destination specified"
exit 1
fi
# File Infrastructure
NAME=$(basename "${SOURCE}")
BASE="${NAME%.*}"
TEMP_DIR="convert_temp"
function cleanUp() {
rm -rf "${TEMP_DIR}"
}
trap cleanUp EXIT
mkdir -p "${TEMP_DIR}"
# check if .ico is a sequence
# pipe into cat so no exit code is given for grep if no matches are found
IS_ICO_SET="$(identify "${SOURCE}" | grep -e "\w\.ico\[0" | cat )"
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convert "${SOURCE}" "${TEMP_DIR}/${BASE}.png"
if [ "${IS_ICO_SET}" ]; then
# extract the largest(?) image from the set
cp "${TEMP_DIR}/${BASE}-0.png" "${DEST}"
else
cp "${TEMP_DIR}/${BASE}.png" "${DEST}"
fi
rm -rf "${TEMP_DIR}"
trap - EXIT
cleanUp