1 ;;; inv-18.el --- invisible feature implementation for Emacs 18
3 ;; Copyright (C) 1995,1996,1997,1998 Free Software Foundation, Inc.
5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
6 ;; Keywords: invisible, text-property, region, Emacs 18
8 ;; This file is part of APEL (A Portable Emacs Library).
10 ;; This program is free software; you can redistribute it and/or
11 ;; modify it under the terms of the GNU General Public License as
12 ;; published by the Free Software Foundation; either version 2, or (at
13 ;; your option) any later version.
15 ;; This program 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.
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with GNU Emacs; see the file COPYING. If not, write to the
22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 ;; Boston, MA 02111-1307, USA.
27 (defmacro enable-invisible ()
30 (make-local-variable 'original-selective-display)
31 (setq original-selective-display selective-display)
32 (setq selective-display t)
35 (defmacro end-of-invisible ()
36 (` (setq selective-display
37 (if (boundp 'original-selective-display)
38 original-selective-display))
41 (defun invisible-region (start end)
42 (let ((buffer-read-only nil) ;Okay even if write protected.
43 (modp (buffer-modified-p)))
46 (eq (following-char) ?\n)
51 (subst-char-in-region start end ?\n ?\^M t)
52 (set-buffer-modified-p modp)
55 (defun visible-region (start end)
56 (let ((buffer-read-only nil) ;Okay even if write protected.
57 (modp (buffer-modified-p)))
59 (subst-char-in-region start end ?\^M ?\n t)
60 (set-buffer-modified-p modp)
63 (defun invisible-p (pos)
66 (eq (following-char) ?\^M)
69 (defun next-visible-point (pos)
73 (if (eq (following-char) ?\n)
85 ;;; inv-18.el ends here