Add setting to hide icon from dock/cmd-tab

macos/Sources/App/macOS/AppDelegate.swift

@@ -533,6 +533,15 @@ 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
+        switch (config.macosHidden) {
+        case .never:
+            NSApp.setActivationPolicy(.regular)
+
+        case .always:
+            NSApp.setActivationPolicy(.accessory)
+        }
+
         // If we have configuration errors, we need to show them.
         let c = ConfigurationErrorsController.sharedInstance
         c.errors = config.errors

macos/Sources/Ghostty/Ghostty.Config.swift

@@ -302,6 +302,16 @@ extension Ghostty {
             return buffer.map { .init(ghostty: $0) }
         }
 
+        var macosHidden: MacHidden {
+            guard let config = self.config else { return .never }
+            var v: UnsafePointer<Int8>? = nil
+            let key = "macos-hidden"
+            guard ghostty_config_get(config, &v, key, UInt(key.count)) else { return .never }
+            guard let ptr = v else { return .never }
+            let str = String(cString: ptr)
+            return MacHidden(rawValue: str) ?? .never
+        }
+
         var focusFollowsMouse : Bool {
             guard let config = self.config else { return false }
             var v = false;
@@ -516,6 +526,11 @@ extension Ghostty.Config {
         case download
     }
 
+    enum MacHidden : String {
+        case never
+        case always
+    }
+
     enum ResizeOverlay : String {
         case always
         case never