Game - move quit handling logic back from MainRoom

sample/src/Game.cs

@@ -23,10 +23,11 @@ public Game(TextReader reader, TextWriter writer)
         public void Run()
         {
             using (CancellationTokenSource cts = new CancellationTokenSource())
+            using (this.bus.Subscribe<SentenceMessage>(m => this.HandleQuit(m.Verb, cts)))
             using (new SentenceParser(this.bus, this.words))
             using (InputLoop loop = this.console.NewLoop())
             {
-                Room room = new MainRoom(this.bus, cts);
+                Room room = new MainRoom(this.bus);
                 room.Enter();
                 loop.Run(cts.Token);
             }
@@ -40,5 +41,16 @@ private static Words InitializeWords()
             w.Add(Verb.Take, "get");
             return w;
         }
+
+        private bool HandleQuit(Word verb, CancellationTokenSource cts)
+        {
+            if (verb.Primary == Verb.Quit)
+            {
+                cts.Cancel();
+                return true;
+            }
+
+            return false;
+        }
     }
 }

sample/src/MainRoom.cs

@@ -4,22 +4,16 @@
 
 namespace Adventure.Sample
 {
-    using System.Threading;
-
     internal sealed class MainRoom : Room
     {
-        private readonly CancellationTokenSource cts;
-
-        public MainRoom(MessageBus bus, CancellationTokenSource cts)
+        public MainRoom(MessageBus bus)
             : base(bus)
         {
-            this.cts = cts;
         }
 
         protected override void EnterCore()
         {
             this.Register(Verb.Greet, (_, __) => this.Output("You say, \"Hello,\" to no one in particular. No one answers."));
-            this.Register(Verb.Quit, (_, n) => this.cts.Cancel());
             this.Register(Verb.Take, (_, n) => this.Output("There is no " + n.Actual.ToLowerInvariant() + " here."));
         }
     }