Switch distribution from ZIP to DMG with drag-to-Applications installer

Replace the zip Makefile target with a dmg target using create-dmg.
Update the release workflow to install create-dmg and upload a .dmg.
Bump version to 0.0.2.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: bensquire

.github/workflows/release.yml

@@ -21,10 +21,13 @@ jobs:
       - name: Build pngquant
         run: make pngquant
 
-      - name: Build and zip
-        run: make zip
+      - name: Install create-dmg
+        run: brew install create-dmg
+
+      - name: Build and create DMG
+        run: make dmg
 
       - name: Create GitHub Release
-        run: gh release create "${{ github.ref_name }}" build/ImageAlpha-${{ github.ref_name }}.zip --generate-notes
+        run: gh release create "${{ github.ref_name }}" build/ImageAlpha-${{ github.ref_name }}.dmg --generate-notes
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## v0.0.2
+
+- Switched distribution from ZIP to DMG with drag-to-Applications installer
+
 ## v0.0.1
 
 - Rewritten in Swift (replacing the original Python/PyObjC implementation)

Info.plist

@@ -38,9 +38,9 @@
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>
-	<string>0.0.1</string>
+	<string>0.0.2</string>
 	<key>CFBundleVersion</key>
-	<string>0.0.1</string>
+	<string>0.0.2</string>
 	<key>LSMinimumSystemVersion</key>
 	<string>15.0</string>
 	<key>NSHumanReadableCopyright</key>

Makefile

@@ -4,7 +4,7 @@ BUILD_DIR = build
 PNGQUANT_DIR = pngquant
 VERSION = $(shell /usr/libexec/PlistBuddy -c "Print CFBundleShortVersionString" Info.plist)
 
-.PHONY: build debug release archive clean pngquant zip
+.PHONY: build debug release archive clean pngquant dmg
 
 build: debug
 
@@ -21,10 +21,18 @@ archive:
 	xcodebuild -project $(PROJECT) -scheme $(SCHEME) -configuration Release \
 		-archivePath $(BUILD_DIR)/ImageAlpha.xcarchive archive
 
-zip: release
+dmg: release
 	mkdir -p $(BUILD_DIR)
 	cp -R $(HOME)/Library/Developer/Xcode/DerivedData/ImageAlpha-*/Build/Products/Release/ImageAlpha.app $(BUILD_DIR)/
-	cd $(BUILD_DIR) && zip -r ImageAlpha-v$(VERSION).zip ImageAlpha.app
+	create-dmg \
+		--volname "ImageAlpha" \
+		--window-pos 200 120 \
+		--window-size 600 400 \
+		--icon "ImageAlpha.app" 150 200 \
+		--app-drop-link 450 200 \
+		--no-internet-enable \
+		$(BUILD_DIR)/ImageAlpha-v$(VERSION).dmg \
+		$(BUILD_DIR)/ImageAlpha.app
 
 clean:
 	xcodebuild -project $(PROJECT) -scheme $(SCHEME) clean