Add debug scrollback tab and smooth scroll wheel

Sources/AppDelegate.swift

@@ -78,6 +78,32 @@ final class AppDelegate: NSObject, NSApplicationDelegate, UNUserNotificationCent
         pasteboard.setString(payload, forType: .string)
     }
 
+#if DEBUG
+    @objc func openDebugScrollbackTab(_ sender: Any?) {
+        guard let tabManager else { return }
+        let tab = tabManager.addTab()
+        let config = GhosttyConfig.load()
+        let lineCount = min(max(config.scrollbackLimit * 2, 2000), 60000)
+        let command = "for i in {1..\(lineCount)}; do printf \"scrollback %06d\\n\" $i; done\n"
+        sendTextWhenReady(command, to: tab)
+    }
+
+    private func sendTextWhenReady(_ text: String, to tab: Tab, attempt: Int = 0) {
+        let maxAttempts = 60
+        if let surface = tab.focusedSurface, surface.surface != nil {
+            surface.sendText(text)
+            return
+        }
+        guard attempt < maxAttempts else {
+            NSLog("Debug scrollback: surface not ready after \(maxAttempts) attempts")
+            return
+        }
+        DispatchQueue.main.asyncAfter(deadline: .now() + 0.05) { [weak self] in
+            self?.sendTextWhenReady(text, to: tab, attempt: attempt + 1)
+        }
+    }
+#endif
+
     func attachUpdateAccessory(to window: NSWindow) {
         titlebarAccessoryController.start()
         titlebarAccessoryController.attach(to: window)

Sources/GhosttyTerminalView.swift

@@ -703,6 +703,15 @@ class TerminalSurface: Identifiable {
         return ghostty_surface_needs_confirm_quit(surface)
     }
 
+    func sendText(_ text: String) {
+        guard let surface = surface else { return }
+        guard let data = text.data(using: .utf8), !data.isEmpty else { return }
+        data.withUnsafeBytes { rawBuffer in
+            guard let baseAddress = rawBuffer.baseAddress?.assumingMemoryBound(to: CChar.self) else { return }
+            ghostty_surface_text(surface, baseAddress, UInt(rawBuffer.count))
+        }
+    }
+
     deinit {
         if ownsDisplayLink {
             GhosttyApp.shared.releaseDisplayLink()
@@ -1480,14 +1489,21 @@ private final class GhosttyScrollView: NSScrollView {
     weak var surfaceView: GhosttyNSView?
 
     override func scrollWheel(with event: NSEvent) {
-        if let surfaceView {
-            if window?.firstResponder !== surfaceView {
-                window?.makeFirstResponder(surfaceView)
-            }
-            surfaceView.scrollWheel(with: event)
+        guard let surfaceView else {
+            super.scrollWheel(with: event)
             return
         }
-        super.scrollWheel(with: event)
+
+        if window?.firstResponder !== surfaceView {
+            window?.makeFirstResponder(surfaceView)
+        }
+
+        if let surface = surfaceView.terminalSurface?.surface,
+           ghostty_surface_mouse_captured(surface) {
+            surfaceView.scrollWheel(with: event)
+        } else {
+            super.scrollWheel(with: event)
+        }
     }
 }
 

Sources/TabManager.swift

@@ -248,7 +248,8 @@ class TabManager: ObservableObject {
         }
     }
 
-    func addTab() {
+    @discardableResult
+    func addTab() -> Tab {
         let newTab = Tab(title: "Terminal \(tabs.count + 1)")
         tabs.append(newTab)
         selectedTabId = newTab.id
@@ -257,6 +258,7 @@ class TabManager: ObservableObject {
             object: nil,
             userInfo: [GhosttyNotificationKey.tabId: newTab.id]
         )
+        return newTab
     }
 
     func moveTabToTop(_ tabId: UUID) {

Sources/cmuxApp.swift

@@ -56,6 +56,14 @@ struct cmuxApp: App {
                 }
             }
 
+#if DEBUG
+            CommandMenu("Debug") {
+                Button("New Tab With Large Scrollback") {
+                    appDelegate.openDebugScrollbackTab(nil)
+                }
+            }
+#endif
+
             // New tab commands
             CommandGroup(replacing: .newItem) {
                 Button("New Tab") {