;;; tabify.el --- tab conversion commands for Emacs ;; Copyright (C) 1985, 1994 Free Software Foundation, Inc. ;; Maintainer: FSF ;; This file is part of GNU Emacs. ;; GNU Emacs is free software; you can redistribute it and/or modify ;; it under the terms of the GNU General Public License as published by ;; the Free Software Foundation; either version 2, or (at your option) ;; any later version. ;; GNU Emacs is distributed in the hope that it will be useful, ;; but WITHOUT ANY WARRANTY; without even the implied warranty of ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the ;; GNU General Public License for more details. ;; You should have received a copy of the GNU General Public License ;; along with GNU Emacs; see the file COPYING. If not, write to ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. ;;; Commentary: ;; Commands to optimize spaces to tabs or expand tabs to spaces in a region ;; (`tabify' and `untabify'). The variable tab-width does the obvious. ;;; Code: ;;;###autoload (defun untabify (start end) "Convert all tabs in region to multiple spaces, preserving columns. Called non-interactively, the region is specified by arguments START and END, rather than by the position of point and mark. The variable `tab-width' controls the spacing of tab stops." (interactive "r") (save-excursion (save-restriction (narrow-to-region (point-min) end) (goto-char start) (while (search-forward "\t" nil t) ; faster than re-search (let ((tab-beg (point)) (column (current-column)) (indent-tabs-mode nil)) (skip-chars-backward "\t" start) (delete-region tab-beg (point)) (indent-to column)))))) ;;;###autoload (defun tabify (start end) "Convert multiple spaces in region to tabs when possible. A group of spaces is partially replaced by tabs when this can be done without changing the column they end at. Called non-interactively, the region is specified by arguments START and END, rather than by the position of point and mark. The variable `tab-width' controls the spacing of tab stops." (interactive "r") (save-excursion (save-restriction (narrow-to-region start end) (goto-char start) (while (re-search-forward "[ \t][ \t][ \t]*" nil t) (let ((column (current-column)) (indent-tabs-mode t)) (delete-region (match-beginning 0) (point)) (indent-to column)))))) (provide 'tabify) ;;; tabify.el ends here