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1 ;;; hide-copyleft.el --- hide obnoxious copyright prologs
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2
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3 ;; Copyright (C) 1997 Sun Microsystems.
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4
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5 ;; This file is part of XEmacs.
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6
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7 ;; XEmacs is free software; you can redistribute it and/or modify it
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8 ;; under the terms of the GNU General Public License as published by
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9 ;; the Free Software Foundation; either version 2, or (at your option)
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10 ;; any later version.
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11
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12 ;; XEmacs is distributed in the hope that it will be useful, but
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13 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 ;; General Public License for more details.
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16
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17 ;; You should have received a copy of the GNU General Public License
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18 ;; along with XEmacs; see the file COPYING. If not, write to the Free
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19 ;; Software Foundation, Inc. 59 Temple Place - Suite 330, Boston, MA
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20 ;; 02111-1307, USA.
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21
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22 ;;; Commentary:
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0
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23
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149
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24 ;; Written by Jamie Zawinski <jwz@netscape.com>, 19-jan-91.
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25 ;; Minor fixes by Martin Buchholz, 14-may-97.
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26 ;; Last modified 14-may-97.
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27 ;;
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28 ;; I sometimes find it tiresome to have fifteen lines of copyright notice at
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29 ;; the beginning of each file. Meta-< does not take you to the beginning of
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30 ;; the code, it takes you a windowfull or two away, which can be tedious on
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31 ;; slow terminal lines.
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32 ;;
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33 ;; I know what the copyright notice says; so this code makes all but the first
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34 ;; line of it be invisible, by using Emacs's selective-display feature. The
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35 ;; text is still present and unmodified, but it is invisible.
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36 ;;
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37 ;; Elide the copyright notice with "Meta-X hide-copyleft-region". Make it
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38 ;; visible again with "Control-U Meta-X hide-copyleft-region". Or, if you're
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39 ;; sure you're not gonna get sued, you can do something like this in your
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40 ;; .emacs file:
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41 ;;
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42 ;; (autoload 'hide-copyleft-region "hide-copyleft" nil t)
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43 ;; (autoload 'unhide-copyleft-region "hide-copyleft" nil t)
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44 ;; (add-hook 'emacs-lisp-mode-hook 'hide-copyleft-region)
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45 ;; (add-hook 'c-mode-hook 'hide-copyleft-region)
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46 ;;
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47 ;; This code (obviously) has quite specific knowledge of the wording of the
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48 ;; various copyrights I've run across. Let me know if you find one on which
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49 ;; it fails.
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0
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50
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51 (defvar copylefts-to-hide
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52 ;; There are some extra backslashes in these strings to prevent this code
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53 ;; from matching the definition of this list as the copyright notice!
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54 '(;; GNU
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55 ("free software\; you can redistribute it" .
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56 "notice must be\ preserved on all")
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57 ("free software\; you can redistribute it" .
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58 "copy of the GNU General Public License.*\n?.*\n?.*\n?.*\n?.*\\(02139,\\|02111-1307\\)")
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59 ("distributed in the hope that it will be useful\," .
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60 "notice must be\ preserved on all")
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61 ("free software\; you can redistribute it" .
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62 "General Public License for more details\\.")
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63 ;; X11
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64 ("Permission to use\, copy, modify," .
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65 "WITH THE USE OR PERFORMANCE")
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66 ("Permission to use\, copy, modify," .
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67 "without express or implied warranty")
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68 ;; Motif
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69 ("Copyright.*OPEN\ SOFTWARE FOUNDATION" .
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70 "X Window System is a trademark of the")
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71 ("THIS SOFTWARE\ IS FURNISHED UNDER A LICENSE" .
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72 "X Window System is a trademark of the")
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73 ;; UPenn
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74 ("Permission to use\, copy, and distribute" .
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75 " provided \"as is\" without")
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76 ;; Evans & Sutherland, Solbourne.
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77 ("Copyright 19[0-9][0-9] by " .
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78 "OR PERFORMANCE OF THIS SOFTWARE\\.")
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79 ;; TI Explorer
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80 ("RESTRICTED RIGHTS LEGEND" . "All rights reserved\\.\\(\n;;; ?$\\)?")
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81 ("^%%BeginDocumentation" . "^%%EndDocumentation")
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82 )
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83 "An alist of pairs of regexps which delimit copyright notices to hide.
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84 The first one found is hidden, so order is significant.")
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85
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86
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87 ;;;###autoload
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88 (defun hide-copyleft-region (&optional arg)
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89 "Make the legal drivel at the front of this file invisible. Unhide it again
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90 with C-u \\[hide-copyleft-region]."
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91 (interactive "P")
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92 (if arg
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93 (unhide-copyleft-region)
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94 (save-excursion
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95 (save-restriction
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96 (if selective-display (error "selective-display is already on."))
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97 (catch 'Abort
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98 (let ((mod-p (buffer-modified-p))
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99 (buffer-read-only nil)
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100 (rest copylefts-to-hide)
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149
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101 pair start end)
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102 (widen)
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103 (goto-char (point-min))
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104 (while (and rest (not pair))
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105 (save-excursion
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106 (and (re-search-forward (car (car rest)) nil t)
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107 (setq start (point))
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108 (re-search-forward (cdr (car rest)) nil t)
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109 (setq end (point)
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110 pair (car rest))))
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111 (setq rest (cdr rest)))
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112 (setq x pair)
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113 (or pair
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114 (if (interactive-p)
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115 (error "Couldn't find a CopyLeft to hide.")
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116 (throw 'Abort nil)))
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117 (goto-char end)
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118 (forward-line 1)
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119 ;; If the last line of the notice closes a C comment, don't
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120 ;; hide that line (to avoid confusion...)
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121 (if (save-excursion (forward-char -3) (looking-at "\\*/"))
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122 (forward-line -1))
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123 (setq end (point))
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124 (goto-char start)
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125 (forward-line 1)
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126 (while (< (point) end)
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127 (delete-char -1)
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128 (insert "\^M")
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129 (forward-line 1))
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130 (setq selective-display t)
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131 (set-buffer-modified-p mod-p)))))))
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132
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133 ;;;###autoload
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134 (defun unhide-copyleft-region ()
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135 "If the legal nonsense at the top of this file is elided, make it visible again."
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136 (save-excursion
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137 (save-restriction
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138 (widen)
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139 (goto-char (point-min))
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140 (let ((mod-p (buffer-modified-p))
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141 (buffer-read-only nil)
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142 end)
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143 (or (search-forward "\^M" nil t) (error "Nothing hidden here, dude."))
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144 (end-of-line)
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145 (setq end (point))
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146 (beginning-of-line)
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147 (while (search-forward "\^M" end t)
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148 (delete-char -1)
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149 (insert "\^J"))
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150 (set-buffer-modified-p mod-p)
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151 (setq selective-display nil)))))
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152
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