render a markdown document on your browser in real time by impatient-mode and markdown-mode

markdown-filter.el

;; How to use:
;; impatient-mode
;; M-x imp-set-user-filter
;; markdown-filter
;; see also https://github.com/skeeto/impatient-mode
(defun markdown-filter (buffer)
  "Render a markdown document on your browser in real time by impatient-mode and markdown-mode."
  (princ
   (with-temp-buffer
     (let ((tempname (buffer-name)))
       (set-buffer buffer)
       (set-buffer (markdown tempname))
       (buffer-string)))
   (current-buffer)))