Add back ability to open an arbitrary window

atom.open now takes an options has that can contain either pathsToOpen
or the complete settings of a new window.

This will be used by the collaboration package to open the window when a
session is being joined.

spec/window-spec.coffee

@@ -207,7 +207,8 @@ describe "Window", ->
         spyOn(atom, "open")
         event = buildDragEvent("drop", [ {path: "/fake1"}, {path: "/fake2"} ])
         window.onDrop(event)
-        expect(atom.open.callCount).toBe 2
+        expect(atom.open.callCount).toBe 1
+        expect(atom.open.argsForCall[0][0]).toEqual pathsToOpen: ['/fake1', '/fake2']
 
     describe "when a non-file is dragged to window", ->
       it "does nothing", ->

src/atom-application.coffee

@@ -128,9 +128,12 @@ class AtomApplication
       event.preventDefault()
       @applicationMenu.showDownloadUpdateItem(version, quitAndUpdateCallback)
 
-    ipc.on 'open', (processId, routingId, pathsToOpen) =>
-      if pathsToOpen?.length > 0
-        @openPaths({pathsToOpen})
+    ipc.on 'open', (processId, routingId, options) =>
+      if options?
+        if options.pathsToOpen?.length > 0
+          @openPaths(options)
+        else
+          new AtomWindow(options)
       else
         @promptForPath()
 

src/atom.coffee

@@ -130,8 +130,8 @@ window.atom =
       packages.push(metadata)
     packages
 
-  open: (url...) ->
-    ipc.sendChannel('open', [url...])
+  open: (options) ->
+    ipc.sendChannel('open', options)
 
   confirm: (message, detailedMessage, buttonLabelsAndCallbacks...) ->
     buttons = []

src/window.coffee

@@ -2,6 +2,7 @@ fsUtils = require 'fs-utils'
 path = require 'path'
 telepath = require 'telepath'
 $ = require 'jquery'
+_ = require 'underscore'
 less = require 'less'
 remote = require 'remote'
 ipc = require 'ipc'
@@ -86,8 +87,8 @@ window.installApmCommand = (callback) ->
 window.onDrop = (e) ->
   e.preventDefault()
   e.stopPropagation()
-  for file in e.originalEvent.dataTransfer.files
-    atom.open(file.path)
+  pathsToOpen = _.pluck(e.originalEvent.dataTransfer.files, 'path')
+  atom.open({pathsToOpen}) if pathsToOpen.length > 0
 
 window.deserializeEditorWindow = ->
   RootView = require 'root-view'