factor chime play into separate function

src/main.rs

@@ -49,17 +49,8 @@ async fn main() {
   let (tx, rx) = mpsc::channel(1);
   events_clients.lock().unwrap().push(tx);
   let pushes = rx.for_each(|()| {
-    if !audio_busy() {
-      trace!("Playing doorbell chime");
-      match process::Command::new("mplayer")
-                             .arg(OUTDOOR_CHIME_FILE)
-                             .stdout(process::Stdio::null())
-                             .stderr(process::Stdio::null())
-                             .spawn() {
-        Ok(child) => { AUDIO_CHILD.with(|cell| cell.replace(Some(child))); },
-        Err(err) => error!("Error playing outdoor chime: {}", err)
-      };
-    } else { debug!("doorbell still ringing, not playing new chime"); }
+    if !audio_busy() { play_chime() }
+    else { debug!("doorbell still ringing, not playing new chime"); }
     futures_util::future::ready(())
   });
 
@@ -118,3 +109,15 @@ fn audio_busy() -> bool {
     false
   })
 }
+
+fn play_chime() {
+  trace!("Playing doorbell chime");
+  match process::Command::new("mplayer")
+                         .arg(OUTDOOR_CHIME_FILE)
+                         .stdout(process::Stdio::null())
+                         .stderr(process::Stdio::null())
+                         .spawn() {
+    Ok(child) => { AUDIO_CHILD.with(|cell| cell.replace(Some(child))); },
+    Err(err) => error!("Error playing outdoor chime: {}", err)
+  };
+}