Atom Themes can be loaded

src/app/root-view.coffee

@@ -10,7 +10,7 @@ Project = require 'project'
 Pane = require 'pane'
 PaneColumn = require 'pane-column'
 PaneRow = require 'pane-row'
-TextMateTheme = require 'text-mate-theme'
+Theme = require 'theme'
 
 module.exports =
 class RootView extends View
@@ -41,7 +41,7 @@ class RootView extends View
 
     config.load()
 
-    TextMateTheme.activate(config.get("core.theme") ? 'IR_Black')
+    Theme.load(config.get("core.theme") ? 'IR_Black')
 
     @handleEvents()
 

src/app/text-mate-theme.coffee

@@ -1,17 +1,18 @@
 _ = require 'underscore'
 fs = require 'fs'
-
 Theme = require 'Theme'
 
 module.exports =
 class TextMateTheme extends Theme
   constructor: (@path, {settings}) ->
-    super
     @rulesets = []
     globalSettings = settings[0]
     @buildGlobalSettingsRulesets(settings[0])
     @buildScopeSelectorRulesets(settings[1..])
 
+    @stylesheets = {}
+    @stylesheets[@path] = @getStylesheet()
+
   getStylesheet: ->
     lines = []
     for {selector, properties} in @getRulesets()

src/app/theme.coffee

@@ -16,7 +16,7 @@ class Theme
     if @isTextMateTheme(path)
       theme = @loadTextMateTheme(path)
     else
-      throw new Error("I only know how to load textmate themes!")
+      theme = @loadAtomTheme(path)
 
     if theme
       theme.activate()
@@ -34,13 +34,25 @@ class Theme
       theme = new TextMateTheme(path, data[0])
     theme
 
+  @loadAtomTheme: (path) ->
+    new Theme(path)
+
   @isTextMateTheme: (path) ->
     /\.(tmTheme|plist)$/.test(path)
 
+  @stylesheets: null
+
   constructor: (@path) ->
+    json = fs.read(fs.join(path, "package.json"))
+    @stylesheets = {}
+    for stylesheetName in JSON.parse(json).stylesheets
+      stylesheetPath = fs.join(@path, stylesheetName)
+      @stylesheets[stylesheetPath] = fs.read(stylesheetPath)
 
   activate: ->
-    applyStylesheet(@path, @getStylesheet())
+    for stylesheetPath, stylesheetContent of @stylesheets
+      applyStylesheet(stylesheetPath, stylesheetContent)
 
-  getStylesheet: ->
-    fs.read(@path)
+  deactivate: ->
+    for stylesheetPath, stylesheetContent of @stylesheets
+      window.removeStylesheet(stylesheetPath)