Project.proto.open emits a 'new-buffer' event if a new buffer is created

RootView.proto.open always uses Project's open method now. RootView creates a project with no path when editing a new buffer, so there's always a project.

src/app/project.coffee

@@ -1,8 +1,9 @@
 fs = require 'fs'
 Buffer = require 'buffer'
+_ = require 'underscore'
+EventEmitter = require 'event-emitter'
 
 module.exports =
-
 class Project
   buffers: null
 
@@ -15,10 +16,19 @@ class Project
       path.replace(projectPath, "") for path in paths when fs.isFile(path)
 
   open: (filePath) ->
-    filePath = @resolve filePath
-    @buffers[filePath] ?= new Buffer(filePath)
+    if filePath?
+      filePath = @resolve(filePath)
+      buffer = @buffers[filePath]
+      unless buffer
+        @buffers[filePath] = buffer = new Buffer(filePath)
+        @trigger 'new-buffer', buffer
+    else
+      buffer = new Buffer
+      @trigger 'new-buffer', buffer
+    buffer
 
   resolve: (filePath) ->
     filePath = fs.join(@path, filePath) unless filePath[0] == '/'
     fs.absolute filePath
 
+_.extend Project.prototype, EventEmitter

src/app/root-view.coffee

@@ -42,6 +42,7 @@ class RootView extends View
       @project = new Project(fs.directory(pathToOpen))
       @open(pathToOpen) if fs.isFile(pathToOpen)
     else if not panesViewState?
+      @project = new Project
       @open()
 
     @deserializePanes(panesViewState) if panesViewState
@@ -65,7 +66,7 @@ class RootView extends View
       when 'Editor' then Editor.deserialize(viewState)
 
   open: (path) ->
-    buffer = if path then @project.open(path) else new Buffer
+    buffer = @project.open(path)
 
     if @activeEditor()
       @activeEditor().setBuffer(buffer)
@@ -86,7 +87,7 @@ class RootView extends View
         .on 'buffer-path-change.root-view', =>
           path = editor.buffer.path
           @setTitle(path)
-          @project ?= new Project(fs.directory(path)) if path
+          @project.path ?= fs.directory(path) if path
 
       @setTitle(editor.buffer.path)
 
@@ -108,7 +109,7 @@ class RootView extends View
     rootPane?.adjustDimensions()
 
   toggleFileFinder: ->
-    return unless @project
+    return unless @project.path?
 
     if @fileFinder and @fileFinder.parent()[0]
       @fileFinder.remove()