build_icon_icns.sh

#!/usr/bin/env bash

set -euo pipefail

ROOT_DIR="$(cd "$(dirname "$0")" && pwd)"
SOURCE_PNG="${1:-$ROOT_DIR/icon.png}"
OUTPUT_ICNS="${2:-$ROOT_DIR/assets/CompressImage.icns}"
TEMP_DIR="$(mktemp -d "${TMPDIR:-/tmp}/compressimage.icon.XXXXXX")"
ICONSET_DIR="$TEMP_DIR/CompressImage.iconset"

cleanup() {
  rm -rf "$TEMP_DIR"
}

trap cleanup EXIT

if [[ ! -f "$SOURCE_PNG" ]]; then
  echo "Icon source not found: $SOURCE_PNG" >&2
  exit 1
fi

mkdir -p "$(dirname "$OUTPUT_ICNS")"
mkdir -p "$ICONSET_DIR"

for size in 16 32 128 256 512; do
  sips -z "$size" "$size" "$SOURCE_PNG" --out "$ICONSET_DIR/icon_${size}x${size}.png" >/dev/null
  retina_size=$((size * 2))
  sips -z "$retina_size" "$retina_size" "$SOURCE_PNG" --out "$ICONSET_DIR/icon_${size}x${size}@2x.png" >/dev/null
done

iconutil -c icns "$ICONSET_DIR" -o "$OUTPUT_ICNS"
echo "Generated app icon: $OUTPUT_ICNS"