code: func App() *Application {
  	if app == nil {
  		confFile := ""
  
  		for i, arg := range os.Args {
  			if arg == "--config" {
  				if len(arg) > i+1 {
  					confFile = os.Args[i+1]
  					break
  				}
  			}
  		}
  
  		app = &Application{}
  		app.init(confFile)
  	}
  
  	return app
  }
docs: // Getting Neo Application instance. This is singleton function.
  // First time when we call this method function will try to parse configuration for Neo application.
  // It will look for configuration file provided by ``--config`` CLI argument (if exist).