partially fix port autoconnect

src/main.rs

@@ -18,6 +18,29 @@ pub fn main () -> Usually<()> {
         .with_midi_ins(&["nanoKEY Studio.*capture.*"])?
         .with_audio_outs(&["Komplete.+:playback_FL", "Komplete.+:playback_FR"])?
         .activate(Some(|app: &Arc<RwLock<App>>| {
+            let (midi_in, mut midi_outs) = {
+                let app = app.read().unwrap();
+                let jack = app.jack.as_ref().unwrap();
+                let midi_in = jack.register_port("midi-in", MidiIn)?;
+                let midi_outs = app.tracks.iter()
+                    .map(|t|Some(jack.register_port(&t.name, MidiOut).unwrap()))
+                    .collect::<Vec<_>>();
+                (midi_in, midi_outs)
+            };
+            {
+                let mut app = app.write().unwrap();
+                let jack = app.jack.as_ref().unwrap();
+                for name in app.midi_ins.iter() {
+                    if let Some(port) = jack.client().port_by_name(&name) {
+                        jack.client().connect_ports(&port, &midi_in)?;
+                    }
+                }
+                app.midi_in = Some(Arc::new(midi_in));
+                for (index, track) in app.tracks.iter_mut().enumerate() {
+                    track.midi_out = midi_outs[index].take();
+                    track.connect_first_device()?;
+                }
+            }
             Ok(())
         }))?;
     run(app)?;