Add Sparkle update framework for macOS

macOS/Info.plist

@@ -15,5 +15,11 @@
 			</array>
 		</dict>
 	</array>
+	<key>SUEnableInstallerLauncherService</key>
+	<true/>
+	<key>SUFeedURL</key>
+	<string>https://repos.yattee.stream/appcast.xml</string>
+	<key>SUPublicEDKey</key>
+	<string>73U5at3utQRS7F/z/7nztpjp3l1gw1Ih+ztOelRLSx4=</string>
 </dict>
 </plist>

macOS/Updates/CheckForUpdatesView.swift

@@ -0,0 +1,10 @@
+import SwiftUI
+
+struct CheckForUpdatesView: View {
+    @EnvironmentObject<UpdaterModel> private var updater
+
+    var body: some View {
+        Button("Check For Updates…", action: updater.checkForUpdates)
+            .disabled(!updater.canCheckForUpdates)
+    }
+}

macOS/Updates/UpdaterModel.swift

@@ -0,0 +1,41 @@
+import Defaults
+import Sparkle
+import SwiftUI
+
+final class UpdaterModel: ObservableObject {
+    @Published var canCheckForUpdates = false
+
+    private let updaterController: SPUStandardUpdaterController
+    private let updaterDelegate = UpdaterDelegate()
+
+    init() {
+        updaterController = SPUStandardUpdaterController(
+            startingUpdater: true,
+            updaterDelegate: updaterDelegate,
+            userDriverDelegate: nil
+        )
+
+        updaterController.updater.publisher(for: \.canCheckForUpdates)
+            .assign(to: &$canCheckForUpdates)
+    }
+
+    func checkForUpdates() {
+        updaterController.checkForUpdates(nil)
+    }
+
+    var automaticallyChecksForUpdates: Bool {
+        updaterController.updater.automaticallyChecksForUpdates
+    }
+
+    func setAutomaticallyChecksForUpdates(_ value: Bool) {
+        updaterController.updater.automaticallyChecksForUpdates = value
+    }
+}
+
+final class UpdaterDelegate: NSObject, SPUUpdaterDelegate {
+    @Default(.enableBetaChannel) private var enableBetaChannel
+
+    func allowedChannels(for _: SPUUpdater) -> Set<String> {
+        Set(enableBetaChannel ? ["beta"] : [])
+    }
+}

macOS/Updates/UpdatesSettings.swift

@@ -0,0 +1,32 @@
+import Defaults
+import SwiftUI
+
+struct UpdatesSettings: View {
+    @EnvironmentObject<UpdaterModel> private var updater
+
+    @State private var automaticallyChecksForUpdates = false
+    @Default(.enableBetaChannel) private var enableBetaChannel
+
+    var body: some View {
+        Section(header: SettingsHeader(text: "Updates")) {
+            Toggle("Check automatically", isOn: $automaticallyChecksForUpdates)
+            Toggle("Enable beta channel", isOn: $enableBetaChannel)
+        }
+        .onAppear {
+            automaticallyChecksForUpdates = updater.automaticallyChecksForUpdates
+        }
+        .onChange(of: automaticallyChecksForUpdates) { _ in
+            updater.setAutomaticallyChecksForUpdates(automaticallyChecksForUpdates)
+        }
+        .frame(maxWidth: .infinity, alignment: .leading)
+
+        Spacer()
+    }
+}
+
+struct UpdatesSettings_Previews: PreviewProvider {
+    static var previews: some View {
+        UpdatesSettings()
+            .injectFixtureEnvironmentObjects()
+    }
+}