libghostty als zweite Terminal-Engine integriert (Default ghostty, SwiftTerm Fallback)

- vendor/libghostty: vorgebaute macOS-libghostty.a (arm64) + Header + Build-Patches + README
- Sources/CGhostty: C-Modul der libghostty-C-API
- Sources/MiniTerm/Ghostty.swift: GhosttyApp + GhosttySurfaceView (Surface, Input, Größe, Fokus)
- main.swift: Engine-Wahl per Info.plist MTEngine
- Package.swift: CGhostty-Target + Link gegen libghostty + Frameworks
- STATUS.md: Stand, Build-Weg (macOS-15-VM), offene Punkte

Sources/MiniTerm/main.swift

@@ -20,6 +20,7 @@ struct AppConfig {
     let fontSize: CGFloat
     let fontName: String
     let windowTitle: String
+    let engine: String          // "ghostty" (Default) oder "swiftterm"
 
     static func load() -> AppConfig {
         let info = Bundle.main.infoDictionary ?? [:]
@@ -27,6 +28,9 @@ struct AppConfig {
         let cmd = ((info["MTCommand"] as? String) ?? "")
             .trimmingCharacters(in: .whitespacesAndNewlines)
 
+        let engine = ((info["MTEngine"] as? String) ?? "ghostty")
+            .trimmingCharacters(in: .whitespacesAndNewlines).lowercased()
+
         var workdir: String? = nil
         if let raw = info["MTWorkingDirectory"] as? String,
            !raw.trimmingCharacters(in: .whitespaces).isEmpty {
@@ -46,7 +50,8 @@ struct AppConfig {
                          workingDirectory: workdir,
                          fontSize: CGFloat(size),
                          fontName: fontName.isEmpty ? "Menlo" : fontName,
-                         windowTitle: title)
+                         windowTitle: title,
+                         engine: engine == "swiftterm" ? "swiftterm" : "ghostty")
     }
 }
 
@@ -55,30 +60,54 @@ final class AppDelegate: NSObject, NSApplicationDelegate, LocalProcessTerminalVi
     private var window: NSWindow!
     private var terminalView: LocalProcessTerminalView!
     private var keyMonitor: Any?
+    private var ghosttyApp: GhosttyApp?
+    private var ghosttyView: GhosttySurfaceView?
     private let config = AppConfig.load()
 
     func applicationDidFinishLaunching(_ notification: Notification) {
         let frame = NSRect(x: 0, y: 0, width: 900, height: 560)
 
-        terminalView = LocalProcessTerminalView(frame: frame)
-        terminalView.processDelegate = self
-        terminalView.font = resolvedFont()
-
-        installKeyMonitor()
-
         window = NSWindow(
             contentRect: frame,
             styleMask: [.titled, .closable, .miniaturizable, .resizable],
             backing: .buffered,
             defer: false)
         window.title = config.windowTitle
-        window.contentView = terminalView
         window.setFrameAutosaveName("MiniTermMain")
         window.center()
-        window.makeKeyAndOrderFront(nil)
-        window.makeFirstResponder(terminalView)
+
+        // Engine wählen. libghostty (GPU-Renderer) ist Default; SwiftTerm bleibt
+        // als Fallback (auch wenn die libghostty-Init scheitert).
+        if config.engine == "ghostty", let contentView = setupGhostty(frame: frame) {
+            window.contentView = contentView
+            window.makeKeyAndOrderFront(nil)
+            window.makeFirstResponder(contentView)
+        } else {
+            setupSwiftTerm(frame: frame)
+        }
 
         setupMenu()
+    }
+
+    private func setupGhostty(frame: NSRect) -> NSView? {
+        guard let gapp = GhosttyApp() else {
+            NSLog("libghostty-Init fehlgeschlagen – Fallback auf SwiftTerm")
+            return nil
+        }
+        ghosttyApp = gapp
+        let view = GhosttySurfaceView(ghostty: gapp, appConfig: config, frame: frame)
+        ghosttyView = view
+        return view
+    }
+
+    private func setupSwiftTerm(frame: NSRect) {
+        terminalView = LocalProcessTerminalView(frame: frame)
+        terminalView.processDelegate = self
+        terminalView.font = resolvedFont()
+        installKeyMonitor()
+        window.contentView = terminalView
+        window.makeKeyAndOrderFront(nil)
+        window.makeFirstResponder(terminalView)
         launchProcess()
     }