Move already opened path logic to Atom Window

src/atom-application.coffee

@@ -220,16 +220,8 @@ class AtomApplication
       atomWindow.sendCommand(command, args...)
 
   windowForPath: (pathToOpen) ->
-    return null unless pathToOpen
-
-    for atomWindow in @windows when atomWindow.getPathToOpen()?
-      if pathToOpen is atomWindow.getPathToOpen()
-        return atomWindow
-
-      if pathToOpen.indexOf(path.join(atomWindow.getPathToOpen(), path.sep)) is 0
-        return atomWindow
-
-    null
+    for atomWindow in @windows
+      return atomWindow if atomWindow.containsPath(pathToOpen)
 
   openPaths: (pathsToOpen=[], pidToKillWhenClosed) ->
     @openPath(pathToOpen, pidToKillWhenClosed) for pathToOpen in pathsToOpen

src/atom-window.coffee

@@ -1,6 +1,7 @@
 BrowserWindow = require 'browser-window'
 dialog = require 'dialog'
 ipc = require 'ipc'
+path = require 'path'
 
 module.exports =
 class AtomWindow
@@ -18,6 +19,16 @@ class AtomWindow
   getPathToOpen: ->
     @browserWindow.loadSettings.pathToOpen
 
+  containsPath: (pathToCheck) ->
+    if not pathToCheck
+      false
+    else if pathToCheck is @getPathToOpen()
+      true
+    else if pathToCheck.indexOf(path.join(@getPathToOpen(), path.sep)) is 0
+      true
+    else
+      false
+
   handleEvents: ->
     @browserWindow.on 'destroyed', =>
       global.atomApplication.removeWindow(this)