Add auto connecting for JACK MIDI ports

src/wrapper/standalone/backend/jack.rs

@@ -133,7 +133,6 @@ impl Jack {
             outputs.push(port);
         }
 
-        // TODO: CLI arguments to connect the MIDI input and output ports
         let midi_input = if P::MIDI_INPUT >= MidiConfig::Basic {
             Some(Arc::new(client.register_port("midi_input", MidiIn)?))
         } else {
@@ -168,6 +167,17 @@ impl Jack {
             }
         }
 
+        if let (Some(port), Some(port_name)) = (&midi_input, config.connect_jack_midi_input) {
+            if let Err(err) = client.connect_ports_by_name(&port_name, &port.name()?) {
+                nih_error!("Could not connect to '{port_name}': {err}");
+            }
+        }
+        if let (Some(port), Some(port_name)) = (&midi_output, config.connect_jack_midi_output) {
+            if let Err(err) = client.connect_ports_by_name(&port.borrow().name()?, &port_name) {
+                nih_error!("Could not connect to '{port_name}': {err}");
+            }
+        }
+
         Ok(Self {
             client: Some(client),
 

src/wrapper/standalone/config.rs

@@ -37,6 +37,18 @@ pub struct WrapperConfig {
     #[clap(value_parser, long)]
     pub connect_jack_inputs: Option<String>,
 
+    /// If set, then the plugin's MIDI input port will be connected to this JACK MIDI output port.
+    ///
+    /// This option is only used with the JACK backend.
+    #[clap(value_parser, long)]
+    pub connect_jack_midi_input: Option<String>,
+
+    /// If set, then the plugin's MIDI output port will be connected to this JACK MIDI input port.
+    ///
+    /// This option is only used with the JACK backend.
+    #[clap(value_parser, long)]
+    pub connect_jack_midi_output: Option<String>,
+
     /// The editor's DPI scaling factor.
     ///
     /// This option is ignored on macOS.