support open fcitx:// scheme

.github/workflows/ci.yml

@@ -45,6 +45,7 @@ jobs:
           git apply --directory=engines/fcitx5-hallelujah patches/hallelujah.patch
           git apply --directory=engines/fcitx5-rime patches/rime.patch
           cmake -B build -G Xcode \
+            -DURL_SCHEME=fcitx \
             -DHALLELUJAH=ON \
             -DRIME=ON \
             -DCMAKE_TOOLCHAIN_FILE=cmake/ios.cmake \

.vscode/tasks.json

@@ -12,7 +12,7 @@
         {
             "type": "shell",
             "label": "Configure",
-            "command": "cmake -B build -G Xcode -DHALLELUJAH=ON -DRIME=ON -DCMAKE_TOOLCHAIN_FILE=cmake/ios.cmake -DIOS_PLATFORM=SIMULATOR",
+            "command": "cmake -B build -G Xcode -DHALLELUJAH=ON -DURL_SCHEME=fcitx -DRIME=ON -DCMAKE_TOOLCHAIN_FILE=cmake/ios.cmake -DIOS_PLATFORM=SIMULATOR",
             "group": {
                 "kind": "build"
             }

CMakeLists.txt

@@ -20,6 +20,10 @@ else()
     set(F5I_TARGET "${CMAKE_OSX_ARCHITECTURES}-apple-ios${CMAKE_OSX_DEPLOYMENT_TARGET}")
 endif()
 
+if (NOT URL_SCHEME)
+    message(FATAL_ERROR "Must provide URL_SCHEME")
+endif()
+
 include(InitializeSwift)
 include(AddSwift)
 

cmake/MacOSXBundleInfo.plist.in

@@ -16,6 +16,36 @@
   <string>@BUNDLE_NAME@</string>
   <key>CFBundleIconFile</key>
   <string>@ICON_FILE@</string>
+  <!-- Register fcitx:// scheme. -->
+  <key>CFBundleURLTypes</key>
+  <array>
+    <dict>
+      <key>CFBundleURLName</key>
+      <string>@BUNDLE_IDENTIFIER@</string>
+      <key>CFBundleURLSchemes</key>
+      <array>
+        <string>@URL_SCHEME@</string>
+      </array>
+    </dict>
+  </array>
+  <!-- Recognize fcitx:// scheme. -->
+  <key>UIApplicationSceneManifest</key>
+  <dict>
+    <key>UIApplicationSupportsMultipleScenes</key>
+    <false/>
+    <key>UISceneConfigurations</key>
+    <dict>
+      <key>UIWindowSceneSessionRoleApplication</key>
+      <array>
+        <dict>
+          <key>UISceneConfigurationName</key>
+          <string>Default Configuration</string>
+          <key>UISceneDelegateClassName</key>
+          <string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
+        </dict>
+      </array>
+    </dict>
+  </dict>
   <!-- A random string makes it fullscreen. -->
   <key>UILaunchScreen</key>
   <string>foo</string>

src/App.swift

@@ -1,10 +1,16 @@
+import OSLog
 import SwiftUI
 
+let logger = Logger(subsystem: "org.fcitx.Fcitx5", category: "FcitxLog")
+
 @main
 struct Fcitx5App: App {
+  @UIApplicationDelegateAdaptor(AppDelegate.self) var appDelegate
+
+  // Dummy. Actual Scene in managed by SceneDelegate.
   var body: some Scene {
     WindowGroup {
-      ContentView()
+      EmptyView()
     }
   }
 }

src/AppDelegate.swift

@@ -0,0 +1,23 @@
+import UIKit
+
+class AppDelegate: NSObject, UIApplicationDelegate {
+  func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+  ) -> Bool {
+    return true
+  }
+
+  func application(
+    _ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession,
+    options: UIScene.ConnectionOptions
+  ) -> UISceneConfiguration {
+    return UISceneConfiguration(
+      name: "Default Configuration", sessionRole: connectingSceneSession.role)
+  }
+
+  func application(
+    _ application: UIApplication, didDiscardSceneSessions sceneSessions: Set<UISceneSession>
+  ) {
+  }
+}

src/CMakeLists.txt

@@ -4,6 +4,8 @@ add_executable(
     ContentView.swift
     App.swift
     util.swift
+    AppDelegate.swift
+    SceneDelegate.swift
 )
 
 add_custom_command(

src/ContentView.swift

@@ -1,14 +1,25 @@
 import SwiftUI
 
+private class ViewModel: ObservableObject {
+  @Published var url: URL?
+}
+
 struct ContentView: View {
   @Environment(\.scenePhase) private var scenePhase
+  @ObservedObject private var viewModel = ViewModel()
+
+  func handleURL(_ url: URL) {
+    viewModel.url = url
+  }
 
   var body: some View {
     VStack {
       Image(systemName: "globe")
         .imageScale(.large)
         .foregroundStyle(.tint)
-      Text("Hello, world!")
+      if let url = viewModel.url {
+        Text("\(url)")
+      }
     }
     .padding()
     .onAppear {

src/SceneDelegate.swift

@@ -0,0 +1,25 @@
+import SwiftUI
+
+class SceneDelegate: UIResponder, UIWindowSceneDelegate {
+  var window: UIWindow?
+  var contentView: ContentView?
+
+  func scene(
+    _ scene: UIScene,
+    willConnectTo session: UISceneSession,
+    options connectionOptions: UIScene.ConnectionOptions
+  ) {
+    if let windowScene = scene as? UIWindowScene {
+      let window = UIWindow(windowScene: windowScene)
+      contentView = ContentView()
+      window.rootViewController = UIHostingController(rootView: contentView)
+      self.window = window
+      window.makeKeyAndVisible()
+    }
+  }
+
+  func scene(_ scene: UIScene, openURLContexts urlContexts: Set<UIOpenURLContext>) {
+    guard let url = urlContexts.first?.url else { return }
+    contentView?.handleURL(url)
+  }
+}