[Python-Dev] whitespace normalization

[Barry Warsaw]

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On Apr 25, 2007, at 2:37 PM, skip at pobox.com wrote:

>>> Well, there are editors that don't intelligently strip  
>>> whitespace, so
>>> that people using them would be constantly pained by such a hook.
>
>     Guido> And they should. There really is no excuse for letting one
>     Guido> developer's poor choice of tools cause later grief for  
> all other
>     Guido> developers.
>
> Just a little FYI, python-mode (the one Barry and I manage - dunno  
> about the
> one distributed w/ GNU Emacs these days) is one of those tools that  
> leaves
> trailing whitespace behind when advancing to the next line..

Maybe we should include this function in the mode:

;; untabify and clean up lines with just whitespace
(defun baw-whitespace-normalization ()
   "Like untabify, but also cleans up lines with trailing whitespace."
   (interactive)
   (save-excursion
     (save-restriction
       (untabify (point-min) (point-max))
       (goto-char (point-min))
       (while (re-search-forward "[ \t]+$" nil t)
         (let ((bol (save-excursion (beginning-of-line) (point)))
               (eol (save-excursion (end-of-line) (point))))
           (goto-char (match-beginning 0))
           (if (and (bolp)
                    (eq (char-after) ?\))
               (forward-char 1))
           (skip-chars-backward " \t" bol)
           (delete-region (point) eol)
           ))
       ;; Now clean up any trailing blank lines
       (goto-char (point-max))
       (skip-chars-backward " \t\n")
       (if (not (bolp))
           (forward-char 1))
       (delete-region (point) (point-max))
       ;; But make sure the files ends in a newline
       (if (not (bolp))
           (newline))
       )))
(defalias 'baw-normalize-whitespace 'baw-whitespace-normalization)

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