97_custom_functions.el

;; http://blog.tuxicity.se/elisp/emacs/2010/05/07/clean-up-buffer-or-region-in-emacs.html
(defun clean-up-buffer-or-region ()
  "Untabifies, indents and deletes trailing whitespace from buffer or region."
  (interactive)
  (save-excursion
    (unless (region-active-p)
      (mark-whole-buffer))
    (untabify (region-beginning) (region-end))
    (indent-region (region-beginning) (region-end))
    (save-restriction
      (narrow-to-region (region-beginning) (region-end))
      (delete-trailing-whitespace))))

(global-set-key (kbd "C-c n") 'clean-up-buffer-or-region)