Add a theme-added event to the theme manager

spec/theme-manager-spec.coffee

@@ -56,3 +56,16 @@ describe "ThemeManager", ->
       spyOn(console, 'warn')
       themeManager.loadTheme('a-theme-that-will-not-be-found')
       expect(console.warn).toHaveBeenCalled()
+
+  describe "theme-loaded event", ->
+    beforeEach ->
+      spyOn(themeManager, 'getUserStylesheetPath').andCallFake -> null
+      themeManager.load()
+
+    it "fires when a new theme has been added", ->
+      themeManager.on 'theme-loaded', loadHandler = jasmine.createSpy()
+
+      config.set('core.themes', ['atom-dark-syntax'])
+
+      expect(loadHandler).toHaveBeenCalled()
+      expect(loadHandler.mostRecentCall.args[0]).toBeInstanceOf Theme

src/theme-manager.coffee

@@ -23,6 +23,9 @@ class ThemeManager
   getAvailableNames: ->
     path.basename(themePath).split('.')[0] for themePath in @getAvailablePaths()
 
+  getThemes: ->
+    _.clone(@loadedThemes)
+
   unload: ->
     removeStylesheet(@userStylesheetPath) if @userStylesheetPath?
     theme.deactivate() while theme = @loadedThemes.pop()
@@ -38,7 +41,9 @@ class ThemeManager
 
   loadTheme: (name) ->
     try
+      theme = new Theme(name)
       @loadedThemes.push(new Theme(name))
+      @trigger('theme-loaded', theme)
     catch error
       console.warn("Failed to load theme #{name}", error.stack ? error)