feat: add macos-window-shadow

optionally enable the window shadow (and border) like Terminal.app

macos/Sources/Features/Terminal/TerminalController.swift

@@ -71,8 +71,8 @@ class TerminalController: NSWindowController, NSWindowDelegate,
         super.init(window: nil)
         
         // Initialize our initial surface.
-        guard let ghostty_app = ghostty.app else { preconditionFailure("app must be loaded") }
+        guard ghostty.app != nil else { preconditionFailure("app must be loaded") }
-        self.surfaceTree = tree ?? .leaf(.init(ghostty_app, baseConfig: base))
+        self.surfaceTree = tree ?? .leaf(.init(ghostty, baseConfig: base))
         
         // Setup our notifications for behaviors
         let center = NotificationCenter.default

macos/Sources/Ghostty/Ghostty.Config.swift

@@ -236,6 +236,14 @@ extension Ghostty {
             return v
         }
         
+        var macosWindowShadow: Bool {
+            guard let config = self.config else { return false }
+            var v = false;
+            let key = "macos-window-shadow"
+            _ = ghostty_config_get(config, &v, key, UInt(key.count))
+            return v
+        }
+
         var backgroundColor: Color {
             var rgb: UInt32 = 0
             let bg_key = "background"

macos/Sources/Ghostty/Ghostty.SplitNode.swift

@@ -168,13 +168,13 @@ extension Ghostty {
         }
 
         class Leaf: ObservableObject, Equatable, Hashable, Codable {
-            let app: ghostty_app_t
+            let app: Ghostty.App
             @Published var surface: SurfaceView
 
             weak var parent: SplitNode.Container?
 
             /// Initialize a new leaf which creates a new terminal surface.
-            init(_ app: ghostty_app_t, baseConfig: SurfaceConfiguration? = nil, uuid: UUID? = nil) {
+            init(_ app: Ghostty.App, baseConfig: SurfaceConfiguration? = nil, uuid: UUID? = nil) {
                 self.app = app
                 self.surface = SurfaceView(app, baseConfig: baseConfig, uuid: uuid)
             }
@@ -182,14 +182,14 @@ extension Ghostty {
             // MARK: - Hashable
             
             func hash(into hasher: inout Hasher) {
-                hasher.combine(app)
+                hasher.combine(app.app)
                 hasher.combine(surface)
             }
             
             // MARK: - Equatable
             
             static func == (lhs: Leaf, rhs: Leaf) -> Bool {
-                return lhs.app == rhs.app && lhs.surface === rhs.surface
+                return lhs.app.app == rhs.app.app && lhs.surface === rhs.surface
             }
             
             // MARK: - Codable
@@ -203,7 +203,7 @@ extension Ghostty {
                 // Decoding uses the global Ghostty app
                 guard let del = NSApplication.shared.delegate,
                       let appDel = del as? AppDelegate,
-                      let app = appDel.ghostty.app else {
+                      appDel.ghostty.app != nil else {
                     throw TerminalRestoreError.delegateInvalid
                 }
                 
@@ -212,7 +212,7 @@ extension Ghostty {
                 var config = SurfaceConfiguration()
                 config.workingDirectory = try container.decode(String?.self, forKey: .pwd)
                 
-                self.init(app, baseConfig: config, uuid: uuid)
+                self.init(appDel.ghostty, baseConfig: config, uuid: uuid)
             }
             
             func encode(to encoder: Encoder) throws {
@@ -223,7 +223,7 @@ extension Ghostty {
         }
 
         class Container: ObservableObject, Equatable, Hashable, Codable {
-            let app: ghostty_app_t
+            let app: Ghostty.App
             let direction: SplitViewDirection
 
             @Published var topLeft: SplitNode
@@ -335,7 +335,7 @@ extension Ghostty {
             // MARK: - Hashable
             
             func hash(into hasher: inout Hasher) {
-                hasher.combine(app)
+                hasher.combine(app.app)
                 hasher.combine(direction)
                 hasher.combine(topLeft)
                 hasher.combine(bottomRight)
@@ -344,7 +344,7 @@ extension Ghostty {
             // MARK: - Equatable
             
             static func == (lhs: Container, rhs: Container) -> Bool {
-                return lhs.app == rhs.app &&
+                return lhs.app.app == rhs.app.app &&
                     lhs.direction == rhs.direction &&
                     lhs.topLeft == rhs.topLeft &&
                     lhs.bottomRight == rhs.bottomRight
@@ -363,12 +363,12 @@ extension Ghostty {
                 // Decoding uses the global Ghostty app
                 guard let del = NSApplication.shared.delegate,
                       let appDel = del as? AppDelegate,
-                      let app = appDel.ghostty.app else {
+                      appDel.ghostty.app != nil else {
                     throw TerminalRestoreError.delegateInvalid
                 }
                 
                 let container = try decoder.container(keyedBy: CodingKeys.self)
-                self.app = app
+                self.app = appDel.ghostty
                 self.direction = try container.decode(SplitViewDirection.self, forKey: .direction)
                 self.split = try container.decode(CGFloat.self, forKey: .split)
                 self.topLeft = try container.decode(SplitNode.self, forKey: .topLeft)

macos/Sources/Ghostty/SurfaceView.swift

@@ -9,8 +9,8 @@ extension Ghostty {
         @FocusedValue(\.ghosttySurfaceTitle) private var surfaceTitle: String?
 
         var body: some View {
-            if let app = self.ghostty.app {
+            if self.ghostty.app != nil {
-                SurfaceForApp(app) { surfaceView in
+                SurfaceForApp(self.ghostty) { surfaceView in
                     SurfaceWrapper(surfaceView: surfaceView)
                 }
                 .navigationTitle(surfaceTitle ?? "Ghostty")
@@ -24,7 +24,7 @@ extension Ghostty {
 
         @StateObject private var surfaceView: SurfaceView
 
-        init(_ app: ghostty_app_t, @ViewBuilder content: @escaping ((SurfaceView) -> Content)) {
+        init(_ app: Ghostty.App, @ViewBuilder content: @escaping ((SurfaceView) -> Content)) {
             _surfaceView = StateObject(wrappedValue: SurfaceView(app))
             self.content = content
         }

macos/Sources/Ghostty/SurfaceView_AppKit.swift

@@ -85,6 +85,8 @@ extension Ghostty {
         // I don't think we need this but this lets us know we should redraw our layer
         // so we'll use that to tell ghostty to refresh.
         override var wantsUpdateLayer: Bool { return true }
+        
+        private let app: Ghostty.App
 
         // State machine for mouse cursor visibility because every call to
         // NSCursor.hide/unhide must be balanced.
@@ -95,9 +97,10 @@ extension Ghostty {
             case pendingHidden
         }
 
-        init(_ app: ghostty_app_t, baseConfig: SurfaceConfiguration? = nil, uuid: UUID? = nil) {
+        init(_ app: Ghostty.App, baseConfig: SurfaceConfiguration? = nil, uuid: UUID? = nil) {
             self.markedText = NSMutableAttributedString()
             self.uuid = uuid ?? .init()
+            self.app = app
 
             // Initialize with some default frame size. The important thing is that this
             // is non-zero so that our layer bounds are non-zero so that our renderer
@@ -121,7 +124,7 @@ extension Ghostty {
             // Setup our surface. This will also initialize all the terminal IO.
             let surface_cfg = baseConfig ?? SurfaceConfiguration()
             var surface_cfg_c = surface_cfg.ghosttyConfig(view: self)
-            guard let surface = ghostty_surface_new(app, &surface_cfg_c) else {
+            guard let surface = ghostty_surface_new(app.app, &surface_cfg_c) else {
                 self.error = AppError.surfaceCreateError
                 return
             }
@@ -369,8 +372,16 @@ extension Ghostty {
             
             // Set the window transparency settings
             window.isOpaque = false
-            window.hasShadow = false
+            
-            window.backgroundColor = .clear
+            if app.config.macosWindowShadow {
+                window.hasShadow = true
+                // NOTE(haze): I have no idea why this works, but it does. This emulates the
+                // aesthetic of `Terminal.app`.
+                window.backgroundColor = .white.withAlphaComponent(0.001)
+            } else {
+                window.hasShadow = false
+                window.backgroundColor = .clear
+            }
 
             // If we have a blur, set the blur
             ghostty_set_window_background_blur(surface, Unmanaged.passUnretained(window).toOpaque())

src/config/Config.zig

@@ -976,6 +976,9 @@ keybind: Keybinds = .{},
 /// This option only applies to new windows when changed.
 @"macos-titlebar-tabs": bool = false,
 
+/// If `true`, render the drop shadow behind the macOS window.
+@"macos-window-shadow": bool = true,
+
 /// If `true`, the *Option* key will be treated as *Alt*. This makes terminal
 /// sequences expecting *Alt* to work properly, but will break Unicode input
 /// sequences on macOS if you use them via the *Alt* key. You may set this to