(defun ess-change-directory (path)
  "Set the current working directory to PATH for both *R* and Emacs."
  (interactive "DDirectory to change to: ")

  (when (file-exists-p path)
    (ess-command (concat "setwd(\"" path "\")\n"))
    ;; use file-name-as-directory to ensure it has trailing /
    (setq default-directory (file-name-as-directory path))))
(add-hook 'ess-mode-hook 'flyspell-prog-mode)
;;; outlining support for ess modes
(add-hook 'ess-mode-hook
      '(lambda ()
         (outline-minor-mode)
         (setq outline-regexp "\\(^#\\{4,5\\} \\)\\|\\(^[a-zA-Z0-9_\.]+ ?<- ?function\\)")
         (defun outline-level ()
           (cond ((looking-at "^##### ") 1)
             ((looking-at "^#### ") 2)
             ((looking-at "^[a-zA-Z0-9_\.]+ ?<- ?function(.*{") 3)
             (t 1000)))
         ))
(add-hook 'ess-mode-hook
          '(lambda ()
             (local-set-key (kbd "C-c C-r")
                            dla/ess-eval-region)))