quiet-super-save.el

;;; Suppress messages
;; http://qiita.com/itiut@github/items/d917eafd6ab255629346
;; http://emacs.stackexchange.com/questions/14706/suppress-message-in-minibuffer-when-a-buffer-is-saved
(defmacro with-suppressed-message (&rest body)
  "Suppress new messages temporarily in the echo area and the `*Messages*' buffer while BODY is evaluated."
  (declare (indent 0))
  (let ((message-log-max nil))
    `(with-temp-message (or (current-message) "") ,@body)))

;;;
;;; super-save.el
;; http://emacsredux.com/blog/2016/01/30/super-save/
;; https://github.com/bbatsov/super-save
(use-package super-save
  :config
  ;; https://www.gnu.org/software/emacs/manual/html_node/elisp/Advising-Functions.html
  (defun quiet-super-save-command (orig-fun)
    (with-suppressed-message (funcall orig-fun)))
  (advice-add 'super-save-command
              :around
              #'quiet-super-save-command)
  ;; Only when idle for some time
  ;; This is active in ssh buffers, too
  (setq super-save-auto-save-when-idle t)
  (setq super-save-idle-duration 5)
  ;; Activate
  (super-save-mode +1))