macos: support drag and drop with no windows

macos/Ghostty-Info.plist

@@ -2,6 +2,21 @@
 <!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
 <plist version="1.0">
 <dict>
+	<key>CFBundleDocumentTypes</key>
+	<array>
+		<dict>
+			<key>CFBundleTypeName</key>
+			<string>Folders</string>
+			<key>CFBundleTypeRole</key>
+			<string>Editor</string>
+			<key>LSHandlerRank</key>
+			<string>Alternate</string>
+			<key>LSItemContentTypes</key>
+			<array>
+				<string>public.directory</string>
+			</array>
+		</dict>
+	</array>
 	<key>LSEnvironment</key>
 	<dict>
 		<key>GHOSTTY_MAC_APP</key>

macos/Sources/AppDelegate.swift

@@ -138,6 +138,23 @@ class AppDelegate: NSObject, ObservableObject, NSApplicationDelegate, GhosttyApp
         return false
     }
     
+    func application(_ sender: NSApplication, openFile filename: String) -> Bool {
+        AppDelegate.logger.warning("OPEN FILE=\(filename)")
+        
+        // Build our config
+        var config = Ghostty.SurfaceConfiguration()
+        config.workingDirectory = filename
+            
+        // If we don't have a window open through the window manager, we launch
+        // a new window.
+        guard let mainWindow = windowManager.mainWindow else {
+            windowManager.addNewWindow(withBaseConfig: config)
+            return true
+        }
+        
+        return false
+    }
+    
     /// This is called for the dock right-click menu.
     func applicationDockMenu(_ sender: NSApplication) -> NSMenu? {
         return dockMenu

macos/Sources/Ghostty/SurfaceView.swift

@@ -199,8 +199,6 @@ extension Ghostty {
         init(from config: ghostty_surface_config_s) {
             self.fontSize = config.font_size
             self.workingDirectory = String.init(cString: config.working_directory, encoding: .utf8)
-            let blah = workingDirectory!
-            AppDelegate.logger.warning("OPEN from=\(blah)")
         }
         
         /// Returns the ghostty configuration for this surface configuration struct. The memory