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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, Inc., 59 Temple Place - Suite 330, Boston, MA
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23 ;; 02111-1307, USA.
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24
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25 ;;; Synched up with: FSF 19.34.
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26
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27 ;;; Commentary:
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28
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29 ;; This package deals with the primitive form of underlining
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30 ;; consisting of prefixing each character with "_\^h". The entry
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31 ;; point `underline-region' performs such underlining on a region.
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32 ;; The entry point `ununderline-region' removes it.
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33
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34 ;;; Code:
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35
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36 ;;;###autoload
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37 (defun underline-region (start end)
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38 "Underline all nonblank characters in the region.
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39 Works by overstriking underscores.
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40 Called from program, takes two arguments START and END
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41 which specify the range to operate on."
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42 ;; XEmacs: FSF doesn't use a '*', a bug? -sb
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43 (interactive "*r")
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44 (save-excursion
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45 (let ((end1 (make-marker)))
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46 (move-marker end1 (max start end))
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47 (goto-char (min start end))
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48 (while (< (point) end1)
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49 (or (looking-at "[_\^@- ]")
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50 (insert "_\b"))
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51 (forward-char 1)))))
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52
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53 ;;;###autoload
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54 (defun ununderline-region (start end)
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55 "Remove all underlining (overstruck underscores) in the region.
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56 Called from program, takes two arguments START and END
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57 which specify the range to operate on."
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58 (interactive "*r")
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59 (save-excursion
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60 (let ((end1 (make-marker)))
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61 (move-marker end1 (max start end))
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62 (goto-char (min start end))
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63 (while (re-search-forward "_\b\\|\b_" end1 t)
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64 (delete-char -2)))))
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65
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66 ;; XEmacs: The rest of these functions are not in FSF. I don't see any
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67 ;; point in removing them. -sb
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68
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69 ;;;###autoload
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70 (defun unoverstrike-region (start end)
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71 "Remove all overstriking (character-backspace-character) in the region.
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72 Called from program, takes two arguments START and END which specify the
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73 range to operate on."
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74 (interactive "*r")
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75 (save-excursion
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76 (let ((end1 (make-marker)))
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77 (move-marker end1 (max start end))
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78 (goto-char (min start end))
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79 (while (re-search-forward "\\(.\\)\b\\1" end1 t)
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80 (delete-char -2)))))
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81
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82 ;;;###autoload
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83 (defun overstrike-region (start end)
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84 "Overstrike (character-backspace-character) all nonblank characters in
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85 the region. Called from program, takes two arguments START and END which
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86 specify the range to operate on."
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87 (interactive "*r")
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88 (save-excursion
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89 (let ((end1 (make-marker)))
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90 (move-marker end1 (max start end))
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91 (goto-char (min start end))
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92 (while (< (point) end1)
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93 (or (looking-at "[_\^@- ]")
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94 (insert (char-after (point)) 8))
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95 (forward-char 1)))))
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96
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97 ;;;###autoload
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98 (defun ununderline-and-unoverstrike-region (start end)
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99 "Remove underlining and overstriking in the region. Called from a program,
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100 takes two arguments START and END which specify the range to operate on."
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101 (interactive "*r")
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102 (save-excursion
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103 ;; This is a piece of nuke-nroff-bs from standard `man.el'.
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104 (goto-char (point-min))
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105 (while (search-forward "\b" (max start end) t)
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106 (let* ((preceding (char-after (- (point) 2)))
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107 (following (following-char)))
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108 (cond ((= preceding following)
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109 ;; x\bx
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110 (delete-char -2))
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111 ((= preceding ?\_)
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112 ;; _\b
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113 (delete-char -2))
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114 ((= following ?\_)
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115 ;; \b_
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116 (delete-region (1- (point)) (1+ (point)))))))))
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117
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118 ;;; underline.el ends here
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