macos: show warning in debug mode

macos/Sources/Features/Primary Window/PrimaryView.swift

@@ -94,6 +94,13 @@ struct PrimaryView: View {
                 self.appDelegate.confirmQuit = $0
             })
             
+            VStack(spacing: 0) {
+                // If we're running in debug mode we show a warning so that users
+                // know that performance will be degraded.
+                if (ghostty.info.mode == GHOSTTY_BUILD_MODE_DEBUG) {
+                    DebugBuildWarningView()
+                }
+                
                 Ghostty.TerminalSplit(onClose: Self.closeWindow, baseConfig: self.baseConfig)
                     .ghosttyApp(ghostty.app!)
                     .ghosttyConfig(ghostty.config!)
@@ -128,6 +135,7 @@ struct PrimaryView: View {
                         }
             }
         }
+    }
     
     static func closeWindow() {
         guard let currentWindow = NSApp.keyWindow else { return }
@@ -196,3 +204,34 @@ struct PrimaryView: View {
         }
     }
 }
+
+struct DebugBuildWarningView: View {
+    @State private var isPopover = false
+    
+    var body: some View {
+        HStack {
+            Spacer()
+            
+            Image(systemName: "exclamationmark.triangle.fill")
+                .foregroundColor(.yellow)
+            
+            Text("You're running a debug build of Ghostty!")
+                .padding(.all, 8)
+                .popover(isPresented: $isPopover, arrowEdge: .bottom) {
+                    Text("""
+                    Debug builds of Ghostty are very slow and you may experience
+                    performance problems. Debug builds are only recommended during
+                    development.
+                    """)
+                    .padding(.all)
+                }
+            
+            Spacer()
+        }
+        .background(Color(.windowBackgroundColor))
+        .frame(maxWidth: .infinity)
+        .onTapGesture {
+            isPopover = true
+        }
+    }
+}

macos/Sources/Ghostty/AppState.swift

@@ -11,6 +11,11 @@ extension Ghostty {
         case loading, error, ready
     }
     
+    struct Info {
+        var mode: ghostty_build_mode_e
+        var version: String
+    }
+    
     /// The AppState is the global state that is associated with the Swift app. This handles initially
     /// initializing Ghostty, loading the configuration, etc.
     class AppState: ObservableObject {
@@ -46,6 +51,18 @@ extension Ghostty {
             return ghostty_app_needs_confirm_quit(app)
         }
         
+        /// Build information
+        var info: Info {
+            let raw = ghostty_info()
+            let version = NSString(
+                bytes: raw.version,
+                length: Int(raw.version_len),
+                encoding: NSUTF8StringEncoding
+            ) ?? "unknown"
+            
+            return Info(mode: raw.build_mode, version: String(version))
+        }
+        
         /// Cached clipboard string for `read_clipboard` callback.
         private var cached_clipboard_string: String? = nil