Refactor Dispatcher

lib/uh/wm/dispatcher.rb

@@ -3,21 +3,20 @@ module Uh
     class Dispatcher
       attr_reader :hooks
 
-      def initialize hooks = Hash.new
-        @hooks = hooks
+      def initialize
+        @hooks = Hash.new { |h, k| h[k] = [] }
       end
 
       def [] *key
-        @hooks[translate_key key] or []
+        @hooks[translate_key key]
       end
 
       def on *key, &block
-        @hooks[translate_key key] ||= []
         @hooks[translate_key key] << block
       end
 
       def emit *key
-        @hooks[translate_key key].tap { |o| o.each { |e| e.call } if o }
+        @hooks[translate_key key].each { |e| e.call }
       end