Quit on `mod1+q' key binding

* Loop our runner until it is "stopped";
* Use the event dispatcher to stop the runner on `mod1+q' key press;
* Tell the manager to grab the `q' key.

lib/uh/wm/runner.rb

@@ -4,7 +4,9 @@ module Uh
       class << self
         def run env, **options
           runner = new env, **options
+          runner.register_event_hooks
           runner.connect_manager
+          runner.run_until { runner.stopped? }
         end
       end
 
@@ -25,14 +27,26 @@ module Uh
         @stopped = true
       end
 
+      def register_event_hooks
+        register_key_bindings_hooks
+      end
+
       def connect_manager
         @manager.connect
         @env.log "Connected to X server"
+        @manager.grab_key :q
       end
 
       def run_until &block
         @manager.handle_pending_events until block.call
       end
+
+
+      private
+
+      def register_key_bindings_hooks
+        @events.on(:key, :q) { stop! }
+      end
     end
   end
 end