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- ;; Tab conversion commands for Emacs
- ;; Copyright (C) 1985 Free Software Foundation, Inc.
-
- ;; 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 1, 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.
-
-
- (defun untabify (start end)
- "Convert all tabs in region to multiple spaces, preserving columns.
- The variable tab-width controls the action."
- (interactive "r")
- (save-excursion
- (save-restriction
- (narrow-to-region start end)
- (goto-char start)
- (while (search-forward "\t" nil t) ; faster than re-search
- (let ((start (point))
- (column (current-column))
- (indent-tabs-mode nil))
- (skip-chars-backward "\t")
- (delete-region start (point))
- (indent-to column))))))
-
- (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.
- The variable tab-width controls the action."
- (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))))))
-