;; better behavior inserting _
;;(require 'ess-smart-underscore)

;; enable code auto completion
(require 'auto-complete-config)
(ac-config-default)
(setq ac-auto-start nil)
(define-key ac-mode-map (kbd "<f2>") 'auto-complete)
(define-key ac-completing-map [return] nil)
(setq ac-quick-help-delay 0.1)