[Python-Dev] whitespace normalization (original) (raw)

Barry Warsaw barry at python.org
Wed Apr 25 22:15:07 CEST 2007

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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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