fix(mobile): iOS terminal can copy, paste, and stop freezing

apps/mobile/modules/t3-terminal/ios/T3TerminalModule.swift

@@ -7,7 +7,7 @@ public class T3TerminalModule: Module {
     // Bumped when native hardware-keyboard handling changes; surfaced in the JS debug
     // logs so a stale native binary is distinguishable from a broken key pipeline.
     Constants([
-      "hardwareKeyRevision": 3,
+      "hardwareKeyRevision": 4,
       "outputRevision": 1,
     ])
 
@@ -63,7 +63,7 @@ public class T3TerminalModule: Module {
       Prop("captureRequest") { (view: T3TerminalView, request: Double) in
         view.captureRequest = request
       }
-      Events("onInput", "onResize", "onCapture")
+      Events("onInput", "onResize", "onCapture", "onPaste")
     }
   }
 }

apps/mobile/modules/t3-terminal/ios/T3TerminalView.swift

@@ -110,6 +110,11 @@ private enum TerminalHardwareKeyEncoder {
   }
 }
 
+/// Ghostty callbacks can fire during deinit and hop to main after it, so they must not retain the view.
+private final class TerminalViewRef {
+  weak var view: T3TerminalView?
+}
+
 private enum TerminalInputSequence {
   /// Terminal Enter is carriage return. Sending line feed instead is Ctrl+J,
   /// which raw-mode TUIs may interpret as the literal J key.
@@ -128,6 +133,7 @@ private enum TerminalInputSequence {
 private final class TerminalInputField: UITextField {
   var onDeleteBackward: (() -> Void)?
   var onInsert: ((String) -> Void)?
+  var onPaste: (() -> Void)?
 
   private static let hardwareKeyCommands = TerminalHardwareKeyEncoder.makeKeyCommands(
     action: #selector(handleHardwareKeyCommand(_:))
@@ -142,6 +148,11 @@ private final class TerminalInputField: UITextField {
     super.deleteBackward()
   }
 
+  // System pastes must bypass typed input to preserve paste encoding and chunking.
+  override func paste(_ sender: Any?) {
+    onPaste?()
+  }
+
   @objc
   private func handleHardwareKeyCommand(_ command: UIKeyCommand) {
     guard let input = command.input else { return }
@@ -184,21 +195,25 @@ private extension UIColor {
   }
 }
 
-public final class T3TerminalView: ExpoView, UITextFieldDelegate {
+public final class T3TerminalView: ExpoView, UITextFieldDelegate, UIEditMenuInteractionDelegate {
   private static let minimumVerticalScrollStepPoints: CGFloat = 18
   private static let verticalScrollStepMultiplier: CGFloat = 1.15
 
   private let terminalViewport = UIView()
   private let inputField = TerminalInputField()
   private let focusTapGesture = UITapGestureRecognizer()
   private let scrollPanGesture = UIPanGestureRecognizer()
+  private let editMenuGesture = UILongPressGestureRecognizer()
+  private lazy var editMenuInteraction = UIEditMenuInteraction(delegate: self)
   private var lastViewportSize: CGSize = .zero
   private var lastContentScale: CGFloat = 0
   private var lastReportedGrid: (cols: Int, rows: Int)?
   private var lastAppliedBuffer = ""
   private var streamedOutput: TerminalOutputBuffer?
   private var pendingVerticalScrollPoints: CGFloat = 0
+  private var menuText: String?
   private var app: ghostty_app_t?
+  private let callbackRef = TerminalViewRef()
   private var surface: ghostty_surface_t?
   private var isCreatingSurface = false
   private var surfaceCreationFailed = false
@@ -208,18 +223,11 @@ public final class T3TerminalView: ExpoView, UITextFieldDelegate {
   let onInput = EventDispatcher()
   let onResize = EventDispatcher()
   let onCapture = EventDispatcher()
+  let onPaste = EventDispatcher()
   var captureRequest: Double = 0 {
     didSet {
       guard captureRequest > 0, captureRequest != oldValue else { return }
-      guard let surface else { onCapture(["text": ""]); return }
-      let selection = ghostty_selection_s(
-        top_left: ghostty_point_s(tag: GHOSTTY_POINT_VIEWPORT, coord: GHOSTTY_POINT_COORD_TOP_LEFT, x: 0, y: 0),
-        bottom_right: ghostty_point_s(tag: GHOSTTY_POINT_VIEWPORT, coord: GHOSTTY_POINT_COORD_BOTTOM_RIGHT, x: 0, y: 0),
-        rectangle: false)
-      var captured = ghostty_text_s()
-      guard ghostty_surface_read_text(surface, selection, &captured) else { onCapture(["text": ""]); return }
-      defer { ghostty_surface_free_text(surface, &captured) }
-      let text = captured.text.flatMap { String(bytes: UnsafeBufferPointer(start: UnsafeRawPointer($0).assumingMemoryBound(to: UInt8.self), count: Int(captured.text_len)), encoding: .utf8) } ?? ""
+      let text = readViewportText() ?? ""
       // Android joins snapshot rows with "\n" and trims each row's trailing whitespace, so do
       // the same here: identical terminal content must capture identically on both platforms.
       let normalized = text.split(separator: "\n", omittingEmptySubsequences: false)
@@ -253,7 +261,7 @@ public final class T3TerminalView: ExpoView, UITextFieldDelegate {
     didSet {
       guard oldValue != fontSize else { return }
       inputField.font = UIFont.monospacedSystemFont(ofSize: max(fontSize, 13), weight: .regular)
-      refreshSurface()
+      resetSurface()
     }
   }
 
@@ -289,14 +297,14 @@ public final class T3TerminalView: ExpoView, UITextFieldDelegate {
     didSet {
       guard oldValue != appearanceScheme else { return }
       appearance = TerminalAppearanceScheme(value: appearanceScheme)
-      refreshSurface()
+      resetSurface()
     }
   }
 
   var themeConfig: String = "" {
     didSet {
       guard oldValue != themeConfig else { return }
-      refreshSurface()
+      resetSurface()
     }
   }
 
@@ -312,6 +320,7 @@ public final class T3TerminalView: ExpoView, UITextFieldDelegate {
 
   public required init(appContext: AppContext? = nil) {
     super.init(appContext: appContext)
+    callbackRef.view = self
 
     applyTheme()
     clipsToBounds = true
@@ -348,13 +357,20 @@ public final class T3TerminalView: ExpoView, UITextFieldDelegate {
     inputField.onInsert = { [weak self] data in
       self?.emitInput(data)
     }
+    inputField.onPaste = { [weak self] in
+      self?.emitPaste()
+    }
 
     focusTapGesture.addTarget(self, action: #selector(handleViewportTap))
     terminalViewport.addGestureRecognizer(focusTapGesture)
     scrollPanGesture.addTarget(self, action: #selector(handleViewportPan(_:)))
     scrollPanGesture.maximumNumberOfTouches = 1
     scrollPanGesture.cancelsTouchesInView = false
     terminalViewport.addGestureRecognizer(scrollPanGesture)
+    editMenuGesture.addTarget(self, action: #selector(handleViewportLongPress(_:)))
+    terminalViewport.addGestureRecognizer(editMenuGesture)
+    terminalViewport.addInteraction(editMenuInteraction)
+    focusTapGesture.require(toFail: editMenuGesture)
 
     addSubview(terminalViewport)
     addSubview(inputField)
@@ -426,6 +442,23 @@ public final class T3TerminalView: ExpoView, UITextFieldDelegate {
     requestKeyboardFocus()
   }
 
+  private func readViewportText() -> String? {
+    guard let surface else { return nil }
+    let selection = ghostty_selection_s(
+      top_left: ghostty_point_s(tag: GHOSTTY_POINT_VIEWPORT, coord: GHOSTTY_POINT_COORD_TOP_LEFT, x: 0, y: 0),
+      bottom_right: ghostty_point_s(tag: GHOSTTY_POINT_VIEWPORT, coord: GHOSTTY_POINT_COORD_BOTTOM_RIGHT, x: 0, y: 0),
+      rectangle: false)
+    var captured = ghostty_text_s()
+    guard ghostty_surface_read_text(surface, selection, &captured) else { return nil }
+    defer { ghostty_surface_free_text(surface, &captured) }
+    guard let text = captured.text else { return nil }
+    return String(
+      bytes: UnsafeBufferPointer(
+        start: UnsafeRawPointer(text).assumingMemoryBound(to: UInt8.self),
+        count: Int(captured.text_len)),
+      encoding: .utf8)
+  }
+
   @objc
   private func handleViewportPan(_ gesture: UIPanGestureRecognizer) {
     guard let surface else { return }
@@ -466,6 +499,83 @@ public final class T3TerminalView: ExpoView, UITextFieldDelegate {
     }
   }
 
+  @objc
+  private func handleViewportLongPress(_ gesture: UILongPressGestureRecognizer) {
+    guard gesture.state == .began else { return }
+    // Freeze the text the user pressed on; output keeps streaming while the menu is open.
+    menuText = readViewportText().flatMap { $0.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty ? nil : $0 }
+    guard menuText != nil || canPaste else { return }
+    editMenuInteraction.presentEditMenu(
+      with: UIEditMenuConfiguration(identifier: nil, sourcePoint: gesture.location(in: terminalViewport))
+    )
+  }
+
+  public func editMenuInteraction(
+    _ interaction: UIEditMenuInteraction,
+    menuFor configuration: UIEditMenuConfiguration,
+    suggestedActions: [UIMenuElement]
+  ) -> UIMenu? {
+    // The hidden input field would otherwise add actions such as Scan Text or Writing Tools.
+    // Keep the system Paste command: unlike a custom action, it reads without a paste prompt.
+    var children: [UIMenuElement] = Self.pasteCommand(in: suggestedActions).map { [$0] } ?? []
+    if let text = menuText {
+      children.append(
+        UIAction(title: "Select Text", image: UIImage(systemName: "text.cursor")) { [weak self] _ in
+          self?.presentTextSelection(text)
+        })
+    }
+    return children.isEmpty ? nil : UIMenu(children: children)
+  }
+
+  private func presentTextSelection(_ text: String) {
+    guard let window else { return }
+    var responder: UIResponder? = self
+    while let current = responder, !(current is UIViewController) {
+      responder = current.next
+    }
+    guard let presenter = responder as? UIViewController,
+      presenter.viewIfLoaded?.window === window,
+      presenter.presentedViewController == nil,
+      !presenter.isBeingPresented,
+      !presenter.isBeingDismissed,
+      presenter.transitionCoordinator == nil
+    else { return }
+
+    inputField.resignFirstResponder()
+    let controller = TerminalTextSelectionViewController(text: text, fontSize: fontSize)
+    let navigation = UINavigationController(rootViewController: controller)
+    navigation.modalPresentationStyle = .pageSheet
+    presenter.present(navigation, animated: !UIAccessibility.isReduceMotionEnabled)
+  }
+
+  private static func pasteCommand(in elements: [UIMenuElement]) -> UIMenuElement? {
+    for element in elements {
+      if let command = element as? UICommand,
+         command.action == #selector(UIResponderStandardEditActions.paste(_:)) {
+        return command
+      }
+      if let menu = element as? UIMenu, let command = pasteCommand(in: menu.children) {
+        return command
+      }
+    }
+    return nil
+  }
+
+  public override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
+    if action == #selector(UIResponderStandardEditActions.paste(_:)) {
+      return canPaste
+    }
+    return super.canPerformAction(action, withSender: sender)
+  }
+
+  public override func paste(_ sender: Any?) {
+    emitPaste()
+  }
+
+  private var canPaste: Bool {
+    !readOnly && UIPasteboard.general.hasStrings
+  }
+
   @objc
   private func handleInputEditingDidBegin() {
     textInputModeDidChange()
@@ -483,9 +593,15 @@ public final class T3TerminalView: ExpoView, UITextFieldDelegate {
     defer { isCreatingSurface = false }
 
     var runtimeConfig = ghostty_runtime_config_s(
-      userdata: Unmanaged.passUnretained(self).toOpaque(),
+      userdata: Unmanaged.passUnretained(callbackRef).toOpaque(),
       supports_selection_clipboard: false,
-      wakeup_cb: { _ in },
+      // The io thread queues app messages (titles, bells) in a bounded mailbox. Unless the main
+      // thread drains it, the io thread blocks and the next feed or surface free hangs the app.
+      wakeup_cb: { userdata in
+        guard let userdata else { return }
+        let ref = Unmanaged<TerminalViewRef>.fromOpaque(userdata).takeUnretainedValue()
+        DispatchQueue.main.async { ref.view?.tickApp() }
+      },
       action_cb: { _, _, _ in false },
       read_clipboard_cb: { _, _, _, _, _, _ in GHOSTTY_CLIPBOARD_READ_UNSUPPORTED },
       confirm_read_clipboard_cb: { _, _, _, _ in },
@@ -544,12 +660,9 @@ public final class T3TerminalView: ExpoView, UITextFieldDelegate {
     setNeedsLayout()
   }
 
-  private func refreshSurface() {
-    resetSurface()
-    createSurfaceIfPossible()
-  }
-
   private func destroySurface() {
+    // Unblock the io thread before ghostty_surface_free joins it.
+    tickApp()
     if let surface {
       ghostty_surface_set_write_callback(surface, nil, nil)
       ghostty_surface_free(surface)
@@ -561,6 +674,11 @@ public final class T3TerminalView: ExpoView, UITextFieldDelegate {
     app = nil
   }
 
+  private func tickApp() {
+    guard let app else { return }
+    ghostty_app_tick(app)
+  }
+
   private func applyRemoteBuffer(_ buffer: String) {
     guard streamedOutput == nil else { return }
     guard surface != nil else {
@@ -591,7 +709,7 @@ public final class T3TerminalView: ExpoView, UITextFieldDelegate {
     output.write(bytes, reset: reset)
     streamedOutput = output
     if reset {
-      refreshSurface()
+      resetSurface()
     } else if surface == nil {
       createSurfaceIfPossible()
     } else {
@@ -608,6 +726,7 @@ public final class T3TerminalView: ExpoView, UITextFieldDelegate {
   private func feedData(_ data: Data) {
     guard let surface, !data.isEmpty else { return }
 
+    tickApp()
     data.withUnsafeBytes { buffer in
       guard let pointer = buffer.baseAddress?.assumingMemoryBound(to: UInt8.self) else {
         return
@@ -621,15 +740,15 @@ public final class T3TerminalView: ExpoView, UITextFieldDelegate {
   private func setupWriteCallback() {
     guard let surface else { return }
 
-    let userdata = Unmanaged.passUnretained(self).toOpaque()
+    let userdata = Unmanaged.passUnretained(callbackRef).toOpaque()
     ghostty_surface_set_write_callback(surface, { userdata, data, len in
       guard let userdata, let data, len > 0 else { return }
-      let view = Unmanaged<T3TerminalView>.fromOpaque(userdata).takeUnretainedValue()
+      let ref = Unmanaged<TerminalViewRef>.fromOpaque(userdata).takeUnretainedValue()
       let bytes = Data(bytes: data, count: len)
       guard let input = String(data: bytes, encoding: .utf8), !input.isEmpty else { return }
 
       DispatchQueue.main.async {
-        view.emitInput(input)
+        ref.view?.emitInput(input)
       }
     }, userdata)
   }
@@ -716,6 +835,11 @@ public final class T3TerminalView: ExpoView, UITextFieldDelegate {
     onInput(["data": data])
   }
 
+  private func emitPaste() {
+    guard let text = UIPasteboard.general.string, !text.isEmpty else { return }
+    onPaste(["text": text])
+  }
+
   private func textInputModeDidChange() {
     guard let app else { return }
     ghostty_app_keyboard_changed(app)