1 ;;; tabify.el --- tab conversion commands for Emacs
3 ;; Copyright (C) 1985 Free Software Foundation, Inc.
7 ;; This file is part of GNU Emacs.
9 ;; GNU Emacs is free software; you can redistribute it and/or modify
10 ;; it under the terms of the GNU General Public License as published by
11 ;; the Free Software Foundation; either version 2, or (at your option)
14 ;; GNU Emacs is distributed in the hope that it will be useful,
15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 ;; GNU General Public License for more details.
19 ;; You should have received a copy of the GNU General Public License
20 ;; along with GNU Emacs; see the file COPYING. If not, write to
21 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
26 (defun untabify (start end
)
27 "Convert all tabs in region to multiple spaces, preserving columns.
28 The variable tab-width controls the action."
32 (narrow-to-region start end
)
34 (while (search-forward "\t" nil t
) ; faster than re-search
36 (column (current-column))
37 (indent-tabs-mode nil
))
38 (skip-chars-backward "\t")
39 (delete-region start
(point))
40 (indent-to column
))))))
43 (defun tabify (start end
)
44 "Convert multiple spaces in region to tabs when possible.
45 A group of spaces is partially replaced by tabs
46 when this can be done without changing the column they end at.
47 The variable tab-width controls the action."
51 (narrow-to-region start end
)
53 (while (re-search-forward "[ \t][ \t][ \t]*" nil t
)
54 (let ((column (current-column))
56 (delete-region (match-beginning 0) (point))
57 (indent-to column
))))))
59 ;;; tabify.el ends here