macOS: Add option to hide window buttons (#7504)

Conversion of #7497 to a PR. This implements a feature requested in
#7331: an option to hide the default window buttons on macOS for a
cleaner aesthetic.

~~Builds on #7502 as it requires the same change to avoid the main
toolbar title showing on top of the tab bar.~~ EDIT: rebased on main now
that #7502 was merged.

I aligned the scope of the new option with `macos-titlebar-style`, since
they both customize titlebar elements. This means it has the same edge
case quirks: For example, if you change the setting, reload the config,
and then open a new tab, the appearance of the current window will
depend on which tab is in the foreground. I did it this way because
`macos-titlebar-style` provided an easy template for which derived
configs and functions to modify. Let me know if you want me to try
adjusting this so that a change in the setting also takes effect for
current windows/tabs, which I _think_ should be possible.

Screenshots:
* `macos-titlebar-style = transparent` (default)
![Screenshot 2025-06-01 at 18 04
56](https://github.com/user-attachments/assets/01fa3953-d2ef-4c39-a6e3-f236488dd841)
![Screenshot 2025-06-01 at 18 07
24](https://github.com/user-attachments/assets/cd463ded-a0b2-4f69-9abe-384e7eecaa27)
* `macos-titlebar-style = tabs`
![Screenshot 2025-06-01 at 17 56
35](https://github.com/user-attachments/assets/bf99d046-cdbb-4e5d-b1c5-d51bbba79007)
![Screenshot 2025-06-01 at 17 56
48](https://github.com/user-attachments/assets/098164b8-bf97-4df1-9dff-c1c17e12665d)

macos/Sources/Features/Terminal/TerminalController.swift

@@ -377,6 +377,14 @@ class TerminalController: BaseTerminalController {
         shouldCascadeWindows = false
     }
 
+   fileprivate func hideWindowButtons() {
+        guard let window else { return }
+
+        window.standardWindowButton(.closeButton)?.isHidden = true
+        window.standardWindowButton(.miniaturizeButton)?.isHidden = true
+        window.standardWindowButton(.zoomButton)?.isHidden = true
+    }
+
     fileprivate func applyHiddenTitlebarStyle() {
         guard let window else { return }
 
@@ -398,9 +406,7 @@ class TerminalController: BaseTerminalController {
         window.titlebarAppearsTransparent = true
 
         // Hide the traffic lights (window control buttons)
-        window.standardWindowButton(.closeButton)?.isHidden = true
-        window.standardWindowButton(.miniaturizeButton)?.isHidden = true
-        window.standardWindowButton(.zoomButton)?.isHidden = true
+        hideWindowButtons()
 
         // Disallow tabbing if the titlebar is hidden, since that will (should) also hide the tab bar.
         window.tabbingMode = .disallowed
@@ -456,6 +462,10 @@ class TerminalController: BaseTerminalController {
             y: config.windowPositionY,
             windowDecorations: config.windowDecorations)
 
+        if config.macosWindowButtons == .hidden {
+            hideWindowButtons()
+        }
+
         // Make sure our theme is set on the window so styling is correct.
         if let windowTheme = config.windowTheme {
             window.windowTheme = .init(rawValue: windowTheme)
@@ -872,17 +882,20 @@ class TerminalController: BaseTerminalController {
 
     struct DerivedConfig {
         let backgroundColor: Color
+        let macosWindowButtons: Ghostty.MacOSWindowButtons
         let macosTitlebarStyle: String
         let maximize: Bool
 
         init() {
             self.backgroundColor = Color(NSColor.windowBackgroundColor)
+            self.macosWindowButtons = .visible
             self.macosTitlebarStyle = "system"
             self.maximize = false
         }
 
         init(_ config: Ghostty.Config) {
             self.backgroundColor = config.backgroundColor
+            self.macosWindowButtons = config.macosWindowButtons
             self.macosTitlebarStyle = config.macosTitlebarStyle
             self.maximize = config.maximize
         }

macos/Sources/Features/Terminal/TerminalWindow.swift

@@ -45,6 +45,18 @@ class TerminalWindow: NSWindow {
         },
     ]
 
+    private var hasWindowButtons: Bool {
+        get {
+            if let close = standardWindowButton(.closeButton),
+                  let miniaturize = standardWindowButton(.miniaturizeButton),
+                  let zoom = standardWindowButton(.zoomButton) {
+                return !(close.isHidden && miniaturize.isHidden && zoom.isHidden)
+            } else {
+                return false
+            }
+        }
+    }
+
     // Both of these must be true for windows without decorations to be able to
     // still become key/main and receive events.
     override var canBecomeKey: Bool { return true }
@@ -613,7 +625,7 @@ class TerminalWindow: NSWindow {
 
         view.translatesAutoresizingMaskIntoConstraints = false
         view.leftAnchor.constraint(equalTo: toolbarView.leftAnchor).isActive = true
-        view.rightAnchor.constraint(equalTo: toolbarView.leftAnchor, constant: 78).isActive = true
+        view.rightAnchor.constraint(equalTo: toolbarView.leftAnchor, constant: hasWindowButtons ? 78 : 0).isActive = true
         view.topAnchor.constraint(equalTo: toolbarView.topAnchor).isActive = true
         view.heightAnchor.constraint(equalTo: toolbarView.heightAnchor).isActive = true
 

macos/Sources/Ghostty/Ghostty.Config.swift

@@ -250,6 +250,17 @@ extension Ghostty {
             return String(cString: ptr)
         }
 
+        var macosWindowButtons: MacOSWindowButtons {
+            let defaultValue = MacOSWindowButtons.visible
+            guard let config = self.config else { return defaultValue }
+            var v: UnsafePointer<Int8>? = nil
+            let key = "macos-window-buttons"
+            guard ghostty_config_get(config, &v, key, UInt(key.count)) else { return defaultValue }
+            guard let ptr = v else { return defaultValue }
+            let str = String(cString: ptr)
+            return MacOSWindowButtons(rawValue: str) ?? defaultValue
+        }
+
         var macosTitlebarStyle: String {
             let defaultValue = "transparent"
             guard let config = self.config else { return defaultValue }

macos/Sources/Ghostty/Package.swift

@@ -239,6 +239,12 @@ extension Ghostty {
         case chrome
     }
 
+    /// Enum for the macos-window-buttons config option
+    enum MacOSWindowButtons: String {
+        case visible
+        case hidden
+    }
+
     /// Enum for the macos-titlebar-proxy-icon config option
     enum MacOSTitlebarProxyIcon: String {
         case visible

src/config/Config.zig

@@ -2069,6 +2069,25 @@ keybind: Keybinds = .{},
 /// it will retain the previous setting until fullscreen is exited.
 @"macos-non-native-fullscreen": NonNativeFullscreen = .false,
 
+/// Whether the window buttons in the macOS titlebar are visible. The window
+/// buttons are the colored buttons in the upper left corner of most macOS apps,
+/// also known as the traffic lights, that allow you to close, miniaturize, and
+/// zoom the window.
+///
+/// This setting has no effect when `window-decoration = false` or
+/// `macos-titlebar-style = hidden`, as the window buttons are always hidden in
+/// these modes.
+///
+/// Valid values are:
+///
+///   * `visible` - Show the window buttons.
+///   * `hidden` - Hide the window buttons.
+///
+/// The default value is `visible`.
+///
+/// Changing this option at runtime only applies to new windows.
+@"macos-window-buttons": MacWindowButtons = .visible,
+
 /// The style of the macOS titlebar. Available values are: "native",
 /// "transparent", "tabs", and "hidden".
 ///
@@ -5819,6 +5838,12 @@ pub const WindowColorspace = enum {
     @"display-p3",
 };
 
+/// See macos-window-buttons
+pub const MacWindowButtons = enum {
+    visible,
+    hidden,
+};
+
 /// See macos-titlebar-style
 pub const MacTitlebarStyle = enum {
     native,