use main loop with input everywhere

src/looper.rs

@@ -6,14 +6,25 @@ pub use self::jack::*;
 pub use self::render::*;
 use crate::prelude::*;
 
-pub struct Looper;
+pub struct Looper {
+    exited: bool
+}
 
-const ACTIONS: [(&'static str, &'static str);1] = [
+pub const ACTIONS: [(&'static str, &'static str);1] = [
     ("Ins/Del", "Add/remove loop"),
 ];
 
 impl Looper {
     pub fn new () -> Result<Self, Box<dyn Error>> {
-        Ok(Self)
+        Ok(Self { exited: false })
+    }
+}
+
+impl Exitable for Looper {
+    fn exit (&mut self) {
+        self.exited = true
+    }
+    fn exited (&self) -> bool {
+        self.exited
     }
 }