Add RootView.eachPane(callback)

spec/app/root-view-spec.coffee

@@ -354,3 +354,31 @@ describe "RootView", ->
       rootView.open(require.resolve('fixtures/sample.txt'))
       expect(count).toBe 1
       expect(callbackBuffer).toBe rootView.getActiveView().getBuffer()
+
+  describe ".eachPane(callback)", ->
+    beforeEach ->
+      rootView.attachToDom()
+
+    it "invokes the callback for all existing panes", ->
+      count = 0
+      callbackPane = null
+      callback = (pane) ->
+        callbackPane = pane
+        count++
+      rootView.eachPane(callback)
+      expect(count).toBe 1
+      expect(callbackPane).toBe rootView.getActivePane()
+
+    it "invokes the callback for new panes", ->
+      count = 0
+      callbackPane = null
+      callback = (pane) ->
+        callbackPane = pane
+        count++
+
+      rootView.eachPane(callback)
+      count = 0
+      callbackPane = null
+      rootView.getActiveView().splitRight()
+      expect(count).toBe 1
+      expect(callbackPane).toBe rootView.getActivePane()

src/app/pane.coffee

@@ -58,7 +58,7 @@ class Pane extends View
 
     return if @attached
     @attached = true
-    @trigger 'pane:attached'
+    @trigger 'pane:attached', [this]
 
   makeActive: ->
     for pane in @getContainer().getPanes() when pane isnt this

src/app/root-view.coffee

@@ -162,6 +162,10 @@ class RootView extends View
   indexOfPane: (pane) ->
     @panes.indexOfPane(pane)
 
+  eachPane: (callback) ->
+    callback(pane) for pane in @getPanes()
+    @on 'pane:attached', (e, pane) -> callback(pane)
+
   eachEditor: (callback) ->
     callback(editor) for editor in @getEditors()
     @on 'editor:attached', (e, editor) -> callback(editor)