Emacs: print with line numbers

Question

Does anyone know how to print with the line numbers of the code in the margin? I can display the line number, cannot have that in the printout. Thanks!

Answer 1

You can add the line numbers with temporary overlays and convert the buffer to HTML using the htmlize package, after which you can save the HTML and print using lpr or a browser.

(defun htmlize-with-line-numbers ()
  (interactive)
  (goto-char (point-min))
  (let ((n 1))
    (while (not (eobp))
      (htmlize-make-tmp-overlay (point) (point) `(before-string ,(format "%4d " n)))
      (setq n (1+ n))
      (forward-line 1)))
  (switch-to-buffer (htmlize-buffer)))

This will require a recent version of htmlize.