Only show menu items for a window/document when it is the key window.

Also add "File > Save" menu item. When document is focused, all menu items associated with its window are added to the main menu. When it is blurred, main menu is reset.

spec/atom/window-spec.coffee

@@ -1,4 +1,5 @@
 require 'window'
+$ = require 'jquery'
 
 describe "Window", ->
   describe "keybindings", ->
@@ -56,14 +57,42 @@ describe "Window", ->
         expectNoMatch 'meta+1', 'alt+1'
 
     describe "bindMenuItem(path, action)", ->
+      it "causes the given menu item to be added to the menu when the window is focused and removed when it is blurred", ->
+        addedPaths = []
+        spyOn(atom.native, 'addMenuItem').andCallFake (path) -> addedPaths.push(path)
+
+        window.bindMenuItem 'Submenu 1 > Item 1'
+        window.bindMenuItem 'Submenu 1 > Item 2'
+        window.bindMenuItem 'Submenu 2 > Item 1'
+
+        expect(atom.native.addMenuItem).not.toHaveBeenCalled()
+
+        $(document).focus()
+
+        expect(atom.native.addMenuItem).toHaveBeenCalled()
+        expect(addedPaths).toContain('Submenu 1 > Item 1')
+        expect(addedPaths).toContain('Submenu 1 > Item 2')
+        expect(addedPaths).toContain('Submenu 2 > Item 1')
+
+        spyOn(atom.native, 'resetMainMenu')
+
+        $(document).blur()
+
+        expect(atom.native.resetMainMenu).toHaveBeenCalled()
+
       it "causes the given action to be invoked when the menu item is selected", ->
         handler = jasmine.createSpy('menuItemHandler')
         window.bindMenuItem 'Submenu > Item', handler
+        $(document).focus()
 
         OSX.NSApp.mainMenu.itemWithTitle('Submenu').submenu.performActionForItemAtIndex(0)
 
         expect(handler).toHaveBeenCalled()
 
+    describe "menu items", ->
+      it "adds a Save item to the main menu after startup", ->
+        expect(OSX.NSApp.mainMenu.itemWithTitle('File').submenu.itemWithTitle('Save')).not.toBeNull()
+
     describe 'meta+s', ->
       it 'saves the buffer', ->
         spyOn(window.editor, 'save')

src/atom/window.coffee

@@ -19,19 +19,26 @@ windowAdditions =
     @menuItemActions = {}
     @layout = Layout.attach()
     @editor = new Editor $atomController.url?.toString()
-    @registerKeydownHandler()
+    @registerEventHandlers()
     @bindKeys()
+    @bindMenuItems()
+    $(document).focus()
 
   shutdown: ->
     @layout.remove()
     @editor.shutdown()
+    $(document).unbind('focus')
+    $(document).unbind('focus')
+    $(window).unbind('keydown')
 
   bindKeys: ->
     @bindKey 'meta+s', => @editor.save()
 
+  bindMenuItems: ->
+    @bindMenuItem "File > Save", => @editor.save()
+
   bindMenuItem: (path, action) ->
     @menuItemActions[path] = action
-    atom.native.addMenuItem(path)
 
   bindKey: (pattern, action) ->
     @keyBindings[pattern] = action
@@ -50,11 +57,18 @@ windowAdditions =
       patternModifiers.metaKey == event.metaKey and
       event.which == key.toUpperCase().charCodeAt 0
 
-  registerKeydownHandler: ->
+  registerEventHandlers: ->
     $(document).bind 'keydown', (event) =>
       for pattern, action of @keyBindings
         action() if @keyEventMatchesPattern(event, pattern)
 
+    $(document).focus => @registerMenuItems()
+    $(document).blur -> atom.native.resetMainMenu()
+
+  registerMenuItems: ->
+    for path of @menuItemActions
+      atom.native.addMenuItem(path)
+
   performActionForMenuItemPath: (path) ->
     @menuItemActions[path]()