use main loop with input everywhere

src/mixer.rs

@@ -11,14 +11,14 @@ use crate::prelude::*;
 //   - If one stage clips, all stages after it are marked red
 //   - If one track clips, all tracks that feed from it are marked red?
 
-const ACTIONS: [(&'static str, &'static str);2] = [
+pub const ACTIONS: [(&'static str, &'static str);2] = [
     ("+/-",     "Adjust"),
     ("Ins/Del", "Add/remove track"),
 ];
 
 pub struct Mixer {
+    exited:          bool,
     jack:            Jack<Notifications>,
-    exit:            bool,
     tracks:          Vec<Track>,
     selected_track:  usize,
     selected_column: usize,
@@ -57,7 +57,7 @@ impl Mixer {
             )
         )?;
         Ok(Self {
-            exit:            false,
+            exited:          false,
             selected_column: 0,
             selected_track:  1,
             tracks: vec![
@@ -108,3 +108,12 @@ impl Track {
         })
     }
 }
+
+impl Exitable for Mixer {
+    fn exit (&mut self) {
+        self.exited = true
+    }
+    fn exited (&self) -> bool {
+        self.exited
+    }
+}