Adds currentPath to Ember.StateManager

This is a shorthand so you don't have to type
router.get('currentState.path') all the time.

packages/ember-states/lib/state_manager.js

@@ -585,6 +585,17 @@ Ember.StateManager = Ember.State.extend(
   */
   currentState: null,
 
+  /**
+   The path of the current state. Returns a string representation of the current
+   state.
+
+   @type String
+   @readOnly
+  */
+  currentPath: Ember.computed('currentState', function() {
+    return get(this, 'currentState.path');
+  }).cacheable(),
+
   /**
     The name of transitionEvent that this stateManager will dispatch
 

packages/ember-states/tests/state_manager_test.js

@@ -77,6 +77,16 @@ test("it reports its current state", function() {
   ok(get(stateManager, 'currentState') === loadedState, "currentState can change to a sibling state");
 });
 
+test("it reports its current state path", function() {
+  strictEqual(get(stateManager, 'currentPath'), null, "currentPath defaults to null if no state is specified");
+
+  stateManager.transitionTo('loadingState');
+  equal(get(stateManager, 'currentPath'), 'loadingState', "currentPath changes after transitionTo() is called");
+
+  stateManager.transitionTo('loadedState');
+  equal(get(stateManager, 'currentPath'), 'loadedState', "currentPath can change to a sibling state");
+});
+
 test("it sends enter and exit events during state transitions", function() {
   stateManager.transitionTo('loadingState');