ThemeManager emits a reload event when reloaded

spec/app/theme-manager-spec.coffee

@@ -7,10 +7,13 @@ describe "ThemeManager", ->
   describe "when the core.themes config value changes", ->
     it "add/removes stylesheets to reflect the new config value", ->
       themeManager = new ThemeManager()
+      themeManager.on 'reload', reloadHandler = jasmine.createSpy()
       spyOn(themeManager, 'getUserStylesheetPath').andCallFake -> null
       themeManager.load()
+
       config.set('core.themes', [])
       expect($('style.userTheme').length).toBe 0
+      expect(reloadHandler).toHaveBeenCalled()
 
       config.set('core.themes', ['atom-dark-syntax'])
       expect($('style.userTheme').length).toBe 1

src/app/theme-manager.coffee

@@ -1,4 +1,5 @@
 path = require 'path'
+EventEmitter = require 'event-emitter'
 
 _ = require 'underscore'
 
@@ -7,6 +8,8 @@ Theme = require 'theme'
 
 module.exports =
 class ThemeManager
+  _.extend @prototype, EventEmitter
+
   constructor: ->
     @loadedThemes = []
 
@@ -27,6 +30,8 @@ class ThemeManager
       @loadTheme(themeName) for themeName in themeNames
       @loadUserStylesheet()
 
+      @trigger('reload')
+
   loadTheme: (name) ->
     try
       @loadedThemes.push(new Theme(name))