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1 ;;; tabify.el --- tab conversion commands for XEmacs
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2
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3 ;; Copyright (C) 1985, 1994 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6
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7 ;; This file is part of XEmacs.
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8
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9 ;; XEmacs is free software; you can redistribute it and/or modify it
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10 ;; under the terms of the GNU General Public License as published by
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11 ;; the Free Software Foundation; either version 2, or (at your option)
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12 ;; any later version.
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13
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14 ;; XEmacs is distributed in the hope that it will be useful, but
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15 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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17 ;; General Public License for more details.
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18
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19 ;; You should have received a copy of the GNU General Public License
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20 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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21 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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22
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23 ;;; Synched up with: FSF 19.30.
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24
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25 ;;; Commentary:
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26
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27 ;; Commands to optimize spaces to tabs or expand tabs to spaces in a region
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28 ;; (`tabify' and `untabify'). The variable tab-width does the obvious.
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29
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30 ;;; Code:
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31
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32 ;;;###autoload
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33 (defun untabify (start end)
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34 "Convert all tabs in region to multiple spaces, preserving columns.
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35 Called non-interactively, the region is specified by arguments
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36 START and END, rather than by the position of point and mark.
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37 The variable `tab-width' controls the spacing of tab stops."
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38 (interactive "r")
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39 (save-excursion
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40 (save-restriction
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41 (narrow-to-region (point-min) end)
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42 (goto-char start)
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43 (let ((percent 5))
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44 (while (search-forward "\t" nil t) ; faster than re-search
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45 (let ((tab-beg (point))
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46 (column (current-column))
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47 (indent-tabs-mode nil))
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48 (skip-chars-backward "\t" start)
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49 (delete-region tab-beg (point))
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50 (indent-to column)
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51 (if (> (/ (* 100 (- (point) start)) (- (point-max) start)) percent)
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52 (progn
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53 (message "untabify: %d%% ..." percent)
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54 (setq percent (+ 5 percent)))))))
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55 (message "untabify: done"))))
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56
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57 ;;;###autoload
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58 (defun tabify (start end)
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59 "Convert multiple spaces in region to tabs when possible.
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60 A group of spaces is partially replaced by tabs
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61 when this can be done without changing the column they end at.
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62 Called non-interactively, the region is specified by arguments
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63 START and END, rather than by the position of point and mark.
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64 The variable `tab-width' controls the spacing of tab stops."
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65 (interactive "r")
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66 (save-excursion
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67 (save-restriction
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68 ;; Include the beginning of the line in the narrowing
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69 ;; since otherwise it will throw off current-column.
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70 (goto-char start)
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71 (beginning-of-line)
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72 (narrow-to-region (point) end)
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73 (goto-char start)
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74 (let ((percent 5))
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75 (while (re-search-forward "[ \t][ \t][ \t]*" nil t)
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76 (let ((column (current-column))
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77 (indent-tabs-mode t))
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78 (delete-region (match-beginning 0) (point))
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79 (indent-to column)
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80 (if (> (/ (* 100 (- (point) start)) (- (point-max) start)) percent)
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81 (progn
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82 (message "tabify: %d%% ..." percent)
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83 (setq percent (+ 5 percent)))))))
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84 (message "tabify: done"))))
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85
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86 (provide 'tabify)
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87
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88 ;;; tabify.el ends here
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