Change how pathsToOpen gets passed around

src/atom-application.coffee

@@ -21,6 +21,7 @@ class AtomApplication
   socketPath: '/tmp/atom.sock'
 
   constructor: ({@resourcePath, @executedFrom, @pathsToOpen, @testMode, @version}) ->
+    @pathsToOpen ?= [@executedFrom] if @executedFrom
     atomApplication = this
     @windows = []
 
@@ -157,8 +158,8 @@ class AtomApplication
   sendCommand: (command) ->
     atomWindow.sendCommand command for atomWindow in @windows when atomWindow.browserWindow.isFocused()
 
-  open: (pathsToOpen = []) ->
-    pathsToOpen = [null] if pathsToOpen.length == 0
+  open: (pathsToOpen) ->
+    pathsToOpen ?= [null]
     for pathToOpen in pathsToOpen
       pathToOpen = path.resolve(@executedFrom, pathToOpen) if @executedFrom and pathToOpen
 

src/main.coffee

@@ -18,8 +18,7 @@ getHomeDir = ->
 parseCommandLine = ->
   args = optimist(process.argv[1..]).argv
   executedFrom = args['executed-from'] ? process.cwd()
-  pathsToOpen = args._
-  pathsToOpen = [executedFrom] if pathsToOpen.length is 0 and args['executed-from']
+  pathsToOpen = if args._.length > 0 then args._ else null
   testMode = true if args['test']
   version = String fs.readFileSync(path.join(__dirname, '..', '..', 'version'))