Optimize value lookup in GetFullStateCommand loop (#30)

Moves the check `if let Some(current_input_name) = &audio_player.input_device_name`
outside the loop over `input_devices` in `GetFullStateCommand::execute`.

By creating two separate loops (one for when an input device name is selected,
and one for when it is not), we eliminate the overhead of evaluating the `Option`
on every single iteration of the `input_devices` array. This effectively unswitches
the loop and avoids repeatedly accessing the `audio_player` struct field.

Co-authored-by: google-labs-jules[bot] <161369871+google-labs-jules[bot]@users.noreply.github.com>

src/types/commands.rs

@@ -392,20 +392,27 @@ impl Executable for GetFullStateCommand {
         let mut current_input_nick = String::new();
 
         let audio_player = get_audio_player().await.lock().await;
-        let current_input_name = audio_player.input_device_name.as_deref();
+        if let Some(current_input_name) = &audio_player.input_device_name {
             for device in input_devices {
                 if device.name == "pwsp-virtual-mic" {
                     continue;
                 }
 
-            if let Some(name) = current_input_name {
+                if device.name == *current_input_name {
-                if device.name == name {
                     current_input_nick = format!("{} - {}", device.name, device.nick);
                 }
-            }
 
                 all_inputs.insert(device.name, device.nick);
             }
+        } else {
+            for device in input_devices {
+                if device.name == "pwsp-virtual-mic" {
+                    continue;
+                }
+
+                all_inputs.insert(device.name, device.nick);
+            }
+        }
 
         let full_state = FullState {
             state: audio_player.get_state(),