Double clicking on a track in the queue plays it

Persephone/Controllers/QueueViewController.swift

@@ -52,6 +52,15 @@ class QueueViewController: NSViewController, NSOutlineViewDataSource, NSOutlineV
     )
   }
 
+  @IBAction func playTrack(_ sender: Any) {
+    guard let view = sender as? NSOutlineView
+      else { return }
+
+    let queuePos = view.selectedRow - 1
+
+    AppDelegate.mpdClient.playTrack(queuePos: queuePos)
+  }
+
   @objc func stateChanged(_ notification: Notification) {
     guard let state = notification.userInfo?[Notification.stateKey] as? MPDClient.Status.State
       else { return }

Persephone/MPDClient/MPDClient.swift

@@ -22,8 +22,8 @@ class MPDClient {
   private let commandQueue = DispatchQueue(label: "commandQueue")
 
   enum Command {
-    case prevTrack, nextTrack, playPause, stop, fetchStatus, fetchQueue,
+    case prevTrack, nextTrack, playPause, stop,
-      fetchAllAlbums
+      fetchStatus, fetchQueue, fetchAllAlbums
   }
 
   struct Idle: OptionSet {
@@ -101,6 +101,14 @@ class MPDClient {
     queueCommand(command: .nextTrack)
   }
 
+  func playTrack(queuePos: Int) {
+    noIdle()
+    commandQueue.async { [unowned self] in
+      mpd_run_play_pos(self.connection, UInt32(queuePos))
+    }
+    idle()
+  }
+
   func queueCommand(command: Command) {
     noIdle()
     commandQueue.async { [unowned self] in