[macOS] feat: Add setting to hide icon from dock/cmd-tab

macos/Sources/App/macOS/AppDelegate.swift

@@ -524,6 +524,9 @@ class AppDelegate: NSObject,
         // AppKit mutex on the appearance.
         DispatchQueue.main.async { self.syncAppearance(config: config) }
 
+        // Decide whether to hide/unhide app from dock and app switcher
+        NSApp.setActivationPolicy(config.macosIconHidden ? .accessory : .regular)
+
         // If we have configuration errors, we need to show them.
         let c = ConfigurationErrorsController.sharedInstance
         c.errors = config.errors

macos/Sources/Ghostty/Ghostty.Config.swift

@@ -300,6 +300,14 @@ extension Ghostty {
             return buffer.map { .init(ghostty: $0) }
         }
 
+        var macosIconHidden: Bool {
+            guard let config = self.config else { return false }
+            var v = false;
+            let key = "macos-icon-hidden"
+            _ = ghostty_config_get(config, &v, key, UInt(key.count))
+            return v;
+        }
+
         var focusFollowsMouse : Bool {
             guard let config = self.config else { return false }
             var v = false;

src/config/Config.zig

@@ -1974,6 +1974,13 @@ keybind: Keybinds = .{},
 /// This only has an effect when `macos-icon` is set to `custom-style`.
 @"macos-icon-screen-color": ?ColorList = null,
 
+/// If true, the macOS icon in the dock and app switcher will be hidden. This is
+/// mainly intended for those primarily using the quick-terminal mode.
+///
+/// Note that setting this to true means that keyboard layout changes
+/// will no longer be automatic.
+@"macos-icon-hidden": bool = false,
+
 /// Put every surface (tab, split, window) into a dedicated Linux cgroup.
 ///
 /// This makes it so that resource management can be done on a per-surface