Re: Emacs removes whitespaces at the end of lines

[Noah Slater <nslater@gnu.org>]

On Sun, Aug 02, 2009 at 03:28:16PM +0200, F. Unglaub wrote:
> I use emacs with mutt and slrn (post-mode) and noticed that
> whitespaces at the end of lines are auto-removed. This leads to
> problems, for example, with the signature delimiter "-- \n". In my
> case it's reduced to "--\n" which certain newsreaders like tin
> consider wrong.

I was getting this too, and I came up with:

  (defun cleanup-buffer ()
    (unless (or (equal major-mode 'makefile-mode)
                (equal major-mode 'makefile-automake-mode)
                (equal major-mode 'makefile-gmake-mode))
      (untabify (point-min) (point-max)))
    (delete-trailing-whitespace)
    (when (equal major-mode 'post-mode)
      (save-excursion
        (goto-char (point-min))
      (while (re-search-forward "^--$" nil t) (replace-match "-- " nil nil)))))

  (add-hook 'write-file-hooks 'cleanup-buffer)

That should add the space back in as you save the file.

Best,

-- 
Noah Slater, http://tumbolia.org/nslater