initial

README

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+mkicns.sh is script that automates creating icns bundle from single PNG image.
+
+REQUIREMENTS
+
+	- macOS
+	- convert utility from imagemagick
+
+USAGE
+
+	mkicns.sh --source icon.png --output icon
+
+	As a result of above command, icon.icns will be created.
+
+LICENSE
+
+	BSD-2c

mkicns.sh

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+#!/bin/sh
+
+set -e
+
+PROGPATH="$0"
+
+usage() {
+	cat <<-_EOT
+	Usage: $PROGPATH <OPTIONS>
+
+	Options:
+	    --source  PNG source (should be 1024x1024)
+	    --output  iconset name, will be created in current directory
+	_EOT
+	exit
+}
+
+error() {
+    echo "error: $@" >&2
+    exit 1
+}
+
+SOURCE=
+OUTPUT=
+
+while :; do
+	case $1 in
+		--source)
+			if [ -n "$2" ]; then
+				SOURCE="$2"
+				shift
+			else
+				error "$q requires an argument"
+			fi
+			;;
+
+		--output)
+			if [ -n "$2" ]; then
+				OUTPUT="$2"
+				shift
+			else
+				error "$q requires an argument"
+			fi
+			;;
+
+		--)
+			shift
+			break
+			;;
+
+		-?*)
+			error "unknown option: %s" "$1"
+            ;;
+
+        *)
+            break
+	esac
+	shift
+done
+
+[ -z "$SOURCE" ] && usage
+[ -z "$OUTPUT" ] && usage
+[ ! -f "$SOURCE" ] && error "source file '$SOURCE' does not exists"
+
+mkdir $OUTPUT.iconset || error "failed to create temporary iconset directory"
+
+convert -background none -resize 16x16     -gravity center -extent 16x16     $SOURCE $OUTPUT.iconset/icon_16x16.png
+convert -background none -resize 32x32     -gravity center -extent 32x32     $SOURCE $OUTPUT.iconset/icon_16x16@2x.png
+convert -background none -resize 32x32     -gravity center -extent 32x32     $SOURCE $OUTPUT.iconset/icon_32x32.png
+convert -background none -resize 64x64     -gravity center -extent 64x64     $SOURCE $OUTPUT.iconset/icon_32x32@2x.png
+convert -background none -resize 64x64     -gravity center -extent 64x64     $SOURCE $OUTPUT.iconset/icon_64x64.png
+convert -background none -resize 128x128   -gravity center -extent 128x128   $SOURCE $OUTPUT.iconset/icon_64x64@2x.png
+convert -background none -resize 128x128   -gravity center -extent 128x128   $SOURCE $OUTPUT.iconset/icon_128x128.png
+convert -background none -resize 256x256   -gravity center -extent 256x256   $SOURCE $OUTPUT.iconset/icon_128x128@2x.png
+convert -background none -resize 256x256   -gravity center -extent 256x256   $SOURCE $OUTPUT.iconset/icon_256x256.png
+convert -background none -resize 512x512   -gravity center -extent 512x512   $SOURCE $OUTPUT.iconset/icon_256x256@2x.png
+convert -background none -resize 512x512   -gravity center -extent 512x512   $SOURCE $OUTPUT.iconset/icon_512x512.png
+convert -background none -resize 1024x1024 -gravity center -extent 1024x1024 $SOURCE $OUTPUT.iconset/icon_512x512@2x.png
+
+iconutil --convert icns $OUTPUT.iconset
+
+rm -R $OUTPUT.iconset