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comparison lisp/packages/underline.el @ 0:376386a54a3c r19-14

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Import from CVS: tag r19-14
author cvs
date Mon, 13 Aug 2007 08:45:50 +0200
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-1:000000000000 0:376386a54a3c
1 ;;; underline.el --- insert/remove underlining (done by overstriking) in Emacs.
2
3 ;; Copyright (C) 1985, 1993 Free Software Foundation, Inc.
4
5 ;; Maintainer: FSF
6 ;; Keywords: wp
7
8 ;; This file is part of XEmacs.
9
10 ;; XEmacs is free software; you can redistribute it and/or modify it
11 ;; under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
13 ;; any later version.
14
15 ;; XEmacs is distributed in the hope that it will be useful, but
16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 ;; General Public License for more details.
19
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
22 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
23
24 ;;; Synched up with: FSF 19.30.
25
26 ;;; Commentary:
27
28 ;; This package deals with the primitive form of underlining
29 ;; consisting of prefixing each character with "_\^h". The entry
30 ;; point `underline-region' performs such underlining on a region.
31 ;; The entry point `ununderline-region' removes it.
32
33 ;;; Code:
34
35 ;;;###autoload
36 (defun underline-region (start end)
37 "Underline all nonblank characters in the region.
38 Works by overstriking underscores.
39 Called from program, takes two arguments START and END
40 which specify the range to operate on."
41 (interactive "*r")
42 (save-excursion
43 (let ((end1 (make-marker)))
44 (move-marker end1 (max start end))
45 (goto-char (min start end))
46 (while (< (point) end1)
47 (or (looking-at "[_\^@- ]")
48 (insert "_\b"))
49 (forward-char 1)))))
50
51 ;;;###autoload
52 (defun ununderline-region (start end)
53 "Remove all underlining (overstruck underscores) in the region.
54 Called from program, takes two arguments START and END
55 which specify the range to operate on."
56 (interactive "*r")
57 (save-excursion
58 (let ((end1 (make-marker)))
59 (move-marker end1 (max start end))
60 (goto-char (min start end))
61 (while (re-search-forward "_\b\\|\b_" end1 t)
62 (delete-char -2)))))
63
64 ;;;###autoload
65 (defun unoverstrike-region (start end)
66 "Remove all overstriking (character-backspace-character) in the region.
67 Called from program, takes two arguments START and END which specify the
68 range to operate on."
69 (interactive "*r")
70 (save-excursion
71 (let ((end1 (make-marker)))
72 (move-marker end1 (max start end))
73 (goto-char (min start end))
74 (while (re-search-forward "\\(.\\)\b\\1" end1 t)
75 (delete-char -2)))))
76
77 ;;;###autoload
78 (defun overstrike-region (start end)
79 "Overstrike (character-backspace-character) all nonblank characters in
80 the region. Called from program, takes two arguments START and END which
81 specify the range to operate on."
82 (interactive "*r")
83 (save-excursion
84 (let ((end1 (make-marker)))
85 (move-marker end1 (max start end))
86 (goto-char (min start end))
87 (while (< (point) end1)
88 (or (looking-at "[_\^@- ]")
89 (insert (char-after (point)) 8))
90 (forward-char 1)))))
91
92 ;;;###autoload
93 (defun ununderline-and-unoverstrike-region (start end)
94 "Remove underlining and overstriking in the region. Called from a program,
95 takes two arguments START and END which specify the range to operate on."
96 (interactive "*r")
97 (save-excursion
98 ;; This is a piece of nuke-nroff-bs from standard `man.el'.
99 (goto-char (point-min))
100 (while (search-forward "\b" (max start end) t)
101 (let* ((preceding (char-after (- (point) 2)))
102 (following (following-char)))
103 (cond ((= preceding following)
104 ;; x\bx
105 (delete-char -2))
106 ((= preceding ?\_)
107 ;; _\b
108 (delete-char -2))
109 ((= following ?\_)
110 ;; \b_
111 (delete-region (1- (point)) (1+ (point)))))))))
112
113 ;;; underline.el ends here