Start on CommandRegistry

src/command-registry.coffee

@@ -0,0 +1,21 @@
+module.exports =
+class CommandRegistry
+  constructor: (@rootNode) ->
+    @listenersByCommandName = {}
+
+  add: (commandName, selector, callback) ->
+    unless @listenersByCommandName[commandName]?
+      @rootNode.addEventListener(commandName, @dispatchCommand, true)
+      @listenersByCommandName[commandName] = []
+
+    @listenersByCommandName[commandName].push({selector, callback})
+
+  dispatchCommand: (event) =>
+    syntheticEvent = Object.create event,
+      eventPhase: value: Event.BUBBLING_PHASE
+      currentTarget: get: -> currentTarget
+
+    currentTarget = event.target
+    for listener in @listenersByCommandName[event.type]
+      if event.target.webkitMatchesSelector(listener.selector)
+        listener.callback.call(currentTarget, syntheticEvent)