Return whether a dispatched command matched a listener

spec/command-registry-spec.coffee

@@ -138,3 +138,10 @@ describe "CommandRegistry", ->
 
       registry.dispatch(grandchild, 'command')
       expect(called).toBe true
+
+    it "returns a boolean indicating whether any listeners matched the command", ->
+      registry.add '.grandchild', 'command', ->
+
+      expect(registry.dispatch(grandchild, 'command')).toBe true
+      expect(registry.dispatch(grandchild, 'bogus')).toBe false
+      expect(registry.dispatch(parent, 'command')).toBe false

src/command-registry.coffee

@@ -152,6 +152,7 @@ class CommandRegistry
   handleCommandEvent: (event) =>
     propagationStopped = false
     immediatePropagationStopped = false
+    matched = false
     currentTarget = event.target
 
     syntheticEvent = Object.create event,
@@ -169,6 +170,8 @@ class CommandRegistry
           .filter (listener) -> currentTarget.webkitMatchesSelector(listener.selector)
           .sort (a, b) -> a.compare(b)
 
+      matched = true if matchingListeners.length > 0
+
       for listener in matchingListeners
         break if immediatePropagationStopped
         listener.callback.call(currentTarget, syntheticEvent)
@@ -178,6 +181,8 @@ class CommandRegistry
       break if propagationStopped
       currentTarget = currentTarget.parentNode
 
+    matched
+
 class CommandListener
   constructor: (@selector, @callback) ->
     @specificity = (SpecificityCache[@selector] ?= specificity(@selector))