Add Editor.setBuffer

src/atom/editor.coffee

@@ -12,7 +12,6 @@ class Editor extends Template
   viewProperties:
     aceEditor: null
     buffer: null
-    editorElement: null
 
     initialize: () ->
       @buildAceEditor()
@@ -24,11 +23,13 @@ class Editor extends Template
     destroy: ->
       @aceEditor.destroy()
 
-    open: (url) ->
-      @buffer = new Buffer(url)
+    setBuffer: (@buffer) ->
       session = new EditSession(@buffer.aceDocument, @buffer.getMode())
       @aceEditor.setSession(session)
 
+    open: (url) ->
+      @setBuffer(new Buffer(url))
+
     buildAceEditor: ->
       @aceEditor = ace.edit this[0]
       @aceEditor.setTheme(require "ace/theme/twilight")

src/atom/root-view.coffee

@@ -39,6 +39,8 @@ class RootView extends Template
       else
         @project.getFilePaths().done (paths) =>
           relativePaths = (path.replace(@project.url, "") for path in paths)
-          @fileFinder = FileFinder.build({urls: relativePaths, selected: (relativePath) => @editor.open(@project.url + relativePath)})
+          @fileFinder = FileFinder.build
+            urls: relativePaths
+            selected: (relativePath) => @editor.open(@project.url + relativePath)
           @addPane(@fileFinder)
           @fileFinder.input.focus()