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1 ;;; underline.el --- insert/remove underlining (done by overstriking) in Emacs.
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2
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3 ;; Copyright (C) 1985, 1993 Free Software Foundation, Inc.
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4
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5 ;; Maintainer: FSF
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6 ;; Keywords: wp
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7
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8 ;; This file is part of XEmacs.
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9
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10 ;; XEmacs is free software; you can redistribute it and/or modify it
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11 ;; under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; XEmacs is distributed in the hope that it will be useful, but
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16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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18 ;; General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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22 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24 ;;; Synched up with: FSF 19.30.
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25
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26 ;;; Commentary:
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27
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28 ;; This package deals with the primitive form of underlining
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29 ;; consisting of prefixing each character with "_\^h". The entry
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30 ;; point `underline-region' performs such underlining on a region.
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31 ;; The entry point `ununderline-region' removes it.
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32
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33 ;;; Code:
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34
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35 ;;;###autoload
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36 (defun underline-region (start end)
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37 "Underline all nonblank characters in the region.
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38 Works by overstriking underscores.
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39 Called from program, takes two arguments START and END
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40 which specify the range to operate on."
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41 (interactive "*r")
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42 (save-excursion
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43 (let ((end1 (make-marker)))
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44 (move-marker end1 (max start end))
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45 (goto-char (min start end))
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46 (while (< (point) end1)
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47 (or (looking-at "[_\^@- ]")
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48 (insert "_\b"))
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49 (forward-char 1)))))
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50
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51 ;;;###autoload
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52 (defun ununderline-region (start end)
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53 "Remove all underlining (overstruck underscores) in the region.
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54 Called from program, takes two arguments START and END
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55 which specify the range to operate on."
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56 (interactive "*r")
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57 (save-excursion
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58 (let ((end1 (make-marker)))
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59 (move-marker end1 (max start end))
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60 (goto-char (min start end))
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61 (while (re-search-forward "_\b\\|\b_" end1 t)
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62 (delete-char -2)))))
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63
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64 ;;;###autoload
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65 (defun unoverstrike-region (start end)
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66 "Remove all overstriking (character-backspace-character) in the region.
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67 Called from program, takes two arguments START and END which specify the
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68 range to operate on."
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69 (interactive "*r")
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70 (save-excursion
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71 (let ((end1 (make-marker)))
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72 (move-marker end1 (max start end))
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73 (goto-char (min start end))
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74 (while (re-search-forward "\\(.\\)\b\\1" end1 t)
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75 (delete-char -2)))))
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76
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77 ;;;###autoload
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78 (defun overstrike-region (start end)
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79 "Overstrike (character-backspace-character) all nonblank characters in
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80 the region. Called from program, takes two arguments START and END which
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81 specify the range to operate on."
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82 (interactive "*r")
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83 (save-excursion
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84 (let ((end1 (make-marker)))
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85 (move-marker end1 (max start end))
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86 (goto-char (min start end))
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87 (while (< (point) end1)
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88 (or (looking-at "[_\^@- ]")
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89 (insert (char-after (point)) 8))
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90 (forward-char 1)))))
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91
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92 ;;;###autoload
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93 (defun ununderline-and-unoverstrike-region (start end)
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94 "Remove underlining and overstriking in the region. Called from a program,
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95 takes two arguments START and END which specify the range to operate on."
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96 (interactive "*r")
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97 (save-excursion
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98 ;; This is a piece of nuke-nroff-bs from standard `man.el'.
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99 (goto-char (point-min))
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100 (while (search-forward "\b" (max start end) t)
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101 (let* ((preceding (char-after (- (point) 2)))
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102 (following (following-char)))
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103 (cond ((= preceding following)
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104 ;; x\bx
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105 (delete-char -2))
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106 ((= preceding ?\_)
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107 ;; _\b
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108 (delete-char -2))
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109 ((= following ?\_)
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110 ;; \b_
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111 (delete-region (1- (point)) (1+ (point)))))))))
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112
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113 ;;; underline.el ends here
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