Re: Clear trailing whitespace on save, but not at the cursor

[Le Wang <l26wang@gmail.com>]

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On Thu, Mar 22, 2012 at 8:13 AM, Aaron Meurer <asmeurer@gmail.com> wrote:

> Sorry, I'm still *very* new to emacs lisp (lisp in general, actually).
>  Does this mean that it's possible to modify the above defadvice
> function you gave above so that it actually clears it before the save,
> but then puts it back?  The function works just fine in not clearing
> at the cursor, but as noted, this is not quite what I want, because I
> do *not* want to save trailing whitespace to file at all (I would
> rather have my current annoyance).
>

The defadvice solution is not ideal.  You're changing the fundamental
behaviour of a function that could be called by other functions.  It's
better to make your own command, this should fit all your requirements:

(defun my-save-buffer-dtws (arg)
  "save buffer delete trailing white space, preserve white space before
point if point is past text"
  (interactive "p")
  (let ((save (when (and (looking-at "\\s-*$")
                         (looking-back "\\s-+" (line-beginning-position) t))
                (match-string 0))))
    (delete-trailing-whitespace)
    (save-buffer arg)
    (when save
      (insert save)
      (set-buffer-modified-p nil))))

(global-set-key [remap save-buffer] 'my-save-buffer-dtws)




> Aaron Meurer
>


-- 
Le

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