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;;; hide-copyleft.el --- hide obnoxious copyright prologs
;; Copyright (C) 1997 Sun Microsystems.
;; This file is part of XEmacs.
;; XEmacs is free software; you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; XEmacs is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;; General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with XEmacs; see the file COPYING. If not, write to the Free
;; Software Foundation, Inc. 59 Temple Place - Suite 330, Boston, MA
;; 02111-1307, USA.
;;; Commentary:
;; Written by Jamie Zawinski <jwz@netscape.com>, 19-jan-91.
;; Minor fixes by Martin Buchholz, 14-may-97.
;; Last modified 14-may-97.
;;
;; I sometimes find it tiresome to have fifteen lines of copyright notice at
;; the beginning of each file. Meta-< does not take you to the beginning of
;; the code, it takes you a windowfull or two away, which can be tedious on
;; slow terminal lines.
;;
;; I know what the copyright notice says; so this code makes all but the first
;; line of it be invisible, by using Emacs's selective-display feature. The
;; text is still present and unmodified, but it is invisible.
;;
;; Elide the copyright notice with "Meta-X hide-copyleft-region". Make it
;; visible again with "Control-U Meta-X hide-copyleft-region". Or, if you're
;; sure you're not gonna get sued, you can do something like this in your
;; .emacs file:
;;
;; (autoload 'hide-copyleft-region "hide-copyleft" nil t)
;; (autoload 'unhide-copyleft-region "hide-copyleft" nil t)
;; (add-hook 'emacs-lisp-mode-hook 'hide-copyleft-region)
;; (add-hook 'c-mode-hook 'hide-copyleft-region)
;;
;; This code (obviously) has quite specific knowledge of the wording of the
;; various copyrights I've run across. Let me know if you find one on which
;; it fails.
(defvar copylefts-to-hide
;; There are some extra backslashes in these strings to prevent this code
;; from matching the definition of this list as the copyright notice!
'(;; GNU
("free software\; you can redistribute it" .
"notice must be\ preserved on all")
("free software\; you can redistribute it" .
"copy of the GNU General Public License.*\n?.*\n?.*\n?.*\n?.*\\(02139,\\|02111-1307\\)")
("distributed in the hope that it will be useful\," .
"notice must be\ preserved on all")
("free software\; you can redistribute it" .
"General Public License for more details\\.")
;; X11
("Permission to use\, copy, modify," .
"WITH THE USE OR PERFORMANCE")
("Permission to use\, copy, modify," .
"without express or implied warranty")
;; Motif
("Copyright.*OPEN\ SOFTWARE FOUNDATION" .
"X Window System is a trademark of the")
("THIS SOFTWARE\ IS FURNISHED UNDER A LICENSE" .
"X Window System is a trademark of the")
;; UPenn
("Permission to use\, copy, and distribute" .
" provided \"as is\" without")
;; Evans & Sutherland, Solbourne.
("Copyright 19[0-9][0-9] by " .
"OR PERFORMANCE OF THIS SOFTWARE\\.")
;; TI Explorer
("RESTRICTED RIGHTS LEGEND" . "All rights reserved\\.\\(\n;;; ?$\\)?")
("^%%BeginDocumentation" . "^%%EndDocumentation")
)
"An alist of pairs of regexps which delimit copyright notices to hide.
The first one found is hidden, so order is significant.")
;;;###autoload
(defun hide-copyleft-region (&optional arg)
"Make the legal drivel at the front of this file invisible. Unhide it again
with C-u \\[hide-copyleft-region]."
(interactive "P")
(if arg
(unhide-copyleft-region)
(save-excursion
(save-restriction
(if selective-display (error "selective-display is already on."))
(catch 'Abort
(let ((mod-p (buffer-modified-p))
(buffer-read-only nil)
(rest copylefts-to-hide)
pair start end)
(widen)
(goto-char (point-min))
(while (and rest (not pair))
(save-excursion
(and (re-search-forward (car (car rest)) nil t)
(setq start (point))
(re-search-forward (cdr (car rest)) nil t)
(setq end (point)
pair (car rest))))
(setq rest (cdr rest)))
(setq x pair)
(or pair
(if (interactive-p)
(error "Couldn't find a CopyLeft to hide.")
(throw 'Abort nil)))
(goto-char end)
(forward-line 1)
;; If the last line of the notice closes a C comment, don't
;; hide that line (to avoid confusion...)
(if (save-excursion (forward-char -3) (looking-at "\\*/"))
(forward-line -1))
(setq end (point))
(goto-char start)
(forward-line 1)
(while (< (point) end)
(delete-char -1)
(insert "\^M")
(forward-line 1))
(setq selective-display t)
(set-buffer-modified-p mod-p)))))))
;;;###autoload
(defun unhide-copyleft-region ()
"If the legal nonsense at the top of this file is elided, make it visible again."
(save-excursion
(save-restriction
(widen)
(goto-char (point-min))
(let ((mod-p (buffer-modified-p))
(buffer-read-only nil)
end)
(or (search-forward "\^M" nil t) (error "Nothing hidden here, dude."))
(end-of-line)
(setq end (point))
(beginning-of-line)
(while (search-forward "\^M" end t)
(delete-char -1)
(insert "\^J"))
(set-buffer-modified-p mod-p)
(setq selective-display nil)))))
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