(defun mk-write-mode-enable ()
  (setq olivetti-body-width 73)
  (setq mode-line-format nil)
  (olivetti-mode))
(defun mk-write-mode-disable ()
  (setq mode-line-format '(("-" mode-line-mule-info mode-line-modified mode-line-frame-identification mode-line-buffer-identification " " mode-line-position mode-line-modes (which-func-mode ("" which-func-format "--")) (global-mode-string ("--" global-mode-string)) "-%-")))
  (olivetti-mode)
  (defvar mode-line-format-current
    (symbol-value 'mode-line-format)))