#+END_SRC
+** View only for some directory
+When see function by =C-h f=, and visit the source code, I would like the buffer is read only. See [[http://emacs.stackexchange.com/questions/3676/how-to-enter-view-only-mode-when-browsing-emacs-source-code-from-help/3681#3681][here]]
+#+BEGIN_SRC emacs-lisp :tangle yes :results silent
+ (dir-locals-set-class-variables
+ 'emacs
+ '((nil . ((buffer-read-only . t)
+ (show-trailing-whitespace . nil)
+ (tab-width . 8)
+ (eval . (whitespace-mode -1))))))
+
+ ;; (dir-locals-set-directory-class (expand-file-name "/usr/local/share/emacs") 'emacs)
+ (dir-locals-set-directory-class "/usr/local/Cellar/emacs" 'emacs)
+ ;; (dir-locals-set-directory-class "~/.emacs.d/elpa" 'emacs)
+ (dir-locals-set-directory-class "~/dotfiles/emacs.d/elpa" 'emacs)
+ (dir-locals-set-directory-class "~/dotfiles/emacs.d/el-get" 'emacs)
+#+END_SRC
+
** Info plus
#+BEGIN_SRC emacs-lisp :tangle yes :results silent
(el-get-bundle info+