Add long press to open currently playing app

Underbar/Items/NowPlayingItem.swift

@@ -11,6 +11,7 @@ import MediaToolbox
 
 class NowPlayingItem: NSCustomTouchBarItem {
 
+    var nowPlayingClientID: String?
     var nowPlayingTitle: String?
     var nowPlayingArtist: String?
     var nowPlayingAlbum: String?
@@ -30,6 +31,10 @@ class NowPlayingItem: NSCustomTouchBarItem {
         
         button.widthAnchor.constraint(equalToConstant: 200).isActive = true
 
+        let longPressRecognizer = NSPressGestureRecognizer(target: self, action: #selector(buttonLongPressed))
+        longPressRecognizer.allowedTouchTypes = .direct
+        button.addGestureRecognizer(longPressRecognizer)
+        
         view = button
 
         MRMediaRemoteRegisterForNowPlayingNotifications(.global(qos: .utility))
@@ -61,6 +66,14 @@ class NowPlayingItem: NSCustomTouchBarItem {
             self.updateButtonTitle()
             self.updateButtonImage()
         }
+        
+        MRMediaRemoteGetNowPlayingClient(.main) { (client) in
+            guard let client = client else {
+                self.nowPlayingClientID = nil
+                return
+            }
+            self.nowPlayingClientID = MRNowPlayingClientGetBundleIdentifier(client)
+        }
     }
     
     func updateButtonTitle() {
@@ -82,6 +95,7 @@ class NowPlayingItem: NSCustomTouchBarItem {
     }
     
     func updateButtonImage() {
+        // todo: custom spotify artwork helper
         if let data = nowPlayingArtwork,
             let image = NSImage(data: data) {
             button.image = image
@@ -124,4 +138,11 @@ class NowPlayingItem: NSCustomTouchBarItem {
         }
     }
     
+    @objc func buttonLongPressed(recognizer: NSPressGestureRecognizer) {
+        if recognizer.state == .began,
+            let nowPlayingClientID = nowPlayingClientID {
+            NSWorkspace.shared.launchApplication(withBundleIdentifier: nowPlayingClientID, options: .default, additionalEventParamDescriptor: nil, launchIdentifier: nil)
+        }
+    }
+    
 }