deactivated event on themes + can reload stylesheet

spec/theme-spec.coffee

@@ -51,3 +51,30 @@ describe "Theme", ->
       expect($(".editor").css("padding-top")).toBe "10px"
       expect($(".editor").css("padding-right")).toBe "20px"
       expect($(".editor").css("padding-bottom")).toBe "30px"
+
+  describe "reloading a theme", ->
+    beforeEach ->
+      themePath = project.resolve('themes/theme-with-package-file')
+      theme = new Theme(themePath)
+      theme.load()
+
+    afterEach ->
+      theme.deactivate()
+
+    it "reloads without readding to the stylesheets list", ->
+      expect(theme.stylesheets.length).toBe 3
+      theme.loadStylesheet(theme.stylesheets[0])
+      expect(theme.stylesheets.length).toBe 3
+
+  describe "events", ->
+    beforeEach ->
+      themePath = project.resolve('themes/theme-with-package-file')
+      theme = new Theme(themePath)
+
+    afterEach ->
+      theme.deactivate()
+
+    it "deactivated event fires on .deactivate()", ->
+      theme.on 'deactivated', spy = jasmine.createSpy()
+      theme.deactivate()
+      expect(spy).toHaveBeenCalled()

src/theme.coffee

@@ -1,10 +1,14 @@
+_ = require 'underscore'
 fsUtils = require 'fs-utils'
 path = require 'path'
+EventEmitter = require 'event-emitter'
 
 ### Internal ###
 
 module.exports =
 class Theme
+  _.extend @prototype, EventEmitter
+
   stylesheetPath: null
   stylesheets: null
 
@@ -24,7 +28,7 @@ class Theme
 
   # Loads the stylesheets found in a `package.cson` file.
   load: ->
-    if path.extname(@stylesheetPath) in ['.css', '.less']
+    if @isFile()
       @loadStylesheet(@stylesheetPath)
     else
       @directoryPath = @stylesheetPath
@@ -38,13 +42,18 @@ class Theme
       else
         @loadStylesheet(stylesheetPath) for stylesheetPath in fsUtils.listSync(@stylesheetPath, ['.css', '.less'])
 
+  isFile: ->
+    path.extname(@stylesheetPath) in ['.css', '.less']
+
   # Given a path, this loads it as a stylesheet.
   #
   # stylesheetPath - A {String} to a stylesheet
   loadStylesheet: (stylesheetPath) ->
-    @stylesheets.push stylesheetPath
+    @stylesheets.push(stylesheetPath) if @stylesheets.indexOf(stylesheetPath) < 0
     content = window.loadStylesheet(stylesheetPath)
     window.applyStylesheet(stylesheetPath, content, 'userTheme')
 
   deactivate: ->
     window.removeStylesheet(stylesheetPath) for stylesheetPath in @stylesheets
+    @trigger('deactivated')
+