1 ;;; emu.el --- Emulation module for each Emacs variants
3 ;; Copyright (C) 1995,1996 Free Software Foundation, Inc.
5 ;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
6 ;; Version: $Id: emu.el,v 7.26 1996/09/05 16:31:02 morioka Exp $
7 ;; Keywords: emulation, compatibility, NEmacs, MULE, XEmacs
9 ;; This file is part of tl (Tiny Library).
11 ;; This program is free software; you can redistribute it and/or
12 ;; modify it under the terms of the GNU General Public License as
13 ;; published by the Free Software Foundation; either version 2, or (at
14 ;; your option) any later version.
16 ;; This program is distributed in the hope that it will be useful, but
17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 ;; General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with this program; see the file COPYING. If not, write to
23 ;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
24 ;; Boston, MA 02111-1307, USA.
28 (or (boundp 'emacs-major-version)
29 (defconst emacs-major-version (string-to-int emacs-version)))
30 (or (boundp 'emacs-minor-version)
31 (defconst emacs-minor-version
35 (string-match (format "%d\\." emacs-major-version) emacs-version)
38 (defvar running-emacs-18 (<= emacs-major-version 18))
39 (defvar running-xemacs (string-match "XEmacs" emacs-version))
40 (defvar running-xemacs-19 (and running-xemacs
41 (= emacs-major-version 19)))
42 (defvar running-xemacs-20 (and running-xemacs
43 (= emacs-major-version 20)))
44 (defvar running-xemacs-20-or-later (and running-xemacs
45 (>= emacs-major-version 20)))
46 (defvar running-xemacs-19_14-or-later
47 (or (and running-xemacs-19 (>= emacs-minor-version 14))
48 running-xemacs-20-or-later))
49 (defvar running-emacs-19 (and (not running-xemacs)
50 (= emacs-major-version 19)))
51 (defvar running-emacs-19_29-or-later
52 (or (and running-emacs-19 (>= emacs-minor-version 29))
53 (and (not running-xemacs)(>= emacs-major-version 20))))
58 ((and running-xemacs-20 (featurep 'mule))
72 (defun charsets-to-mime-charset (charsets)
73 "Return MIME charset from list of charset CHARSETS.
74 This function refers variable `charsets-mime-charset-alist'
75 and `default-mime-charset'. [emu.el]"
78 (let ((rest charsets-mime-charset-alist)
80 (while (setq cell (car rest))
81 (if (catch 'not-subset
88 (throw 'not-subset nil)
90 (setq set1 (cdr set1))
93 (throw 'tag (cdr cell))
95 (setq rest (cdr rest))
97 default-mime-charset)))
100 ;;; @ EMACS 19.29 emulation
103 (or (fboundp 'buffer-substring-no-properties)
104 (defun buffer-substring-no-properties (beg end)
105 "Return the text from BEG to END, without text properties, as a string.
106 \[emu.el; EMACS 19.29 emulating function]"
107 (let ((string (buffer-substring beg end)))
108 (tl:set-text-properties 0 (length string) nil string)
112 (or running-emacs-19_29-or-later
114 ;; for Emacs 19.28 or earlier
115 (fboundp 'si:read-string)
117 (fset 'si:read-string (symbol-function 'read-string))
119 (defun read-string (prompt &optional initial-input history)
120 "Read a string from the minibuffer, prompting with string PROMPT.
121 If non-nil, second arg INITIAL-INPUT is a string to insert before reading.
122 The third arg HISTORY, is dummy for compatibility. [emu.el]
123 See `read-from-minibuffer' for details of HISTORY argument."
124 (si:read-string prompt initial-input)
128 (or (fboundp 'add-to-list)
129 ;; This function was imported Emacs 19.30.
130 (defun add-to-list (list-var element)
131 "Add to the value of LIST-VAR the element ELEMENT if it isn't there yet.
132 If you want to use `add-to-list' on a variable that is not defined
133 until a certain package is loaded, you should put the call to `add-to-list'
134 into a hook function that will be run only after loading the package.
135 \[emu.el; EMACS 19.30 emulating function]"
136 (or (member element (symbol-value list-var))
137 (set list-var (cons element (symbol-value list-var)))))
141 ;;; @ EMACS 19.31 emulation
144 (or (fboundp 'buffer-live-p)
145 (defun buffer-live-p (object)
146 "Return non-nil if OBJECT is a buffer which has not been killed.
147 Value is nil if OBJECT is not a buffer or if it has been killed.
148 \[emu.el; EMACS 19.31 emulating function]"
151 (buffer-name (get-buffer object))
155 (or (fboundp 'save-selected-window)
156 ;; This function was imported Emacs 19.33.
157 (defmacro save-selected-window (&rest body)
158 "Execute BODY, then select the window that was selected before BODY.
159 \[emu.el; EMACS 19.31 emulating function]"
161 '((save-selected-window-window (selected-window)))
162 (list 'unwind-protect
164 (list 'select-window 'save-selected-window-window))))
168 ;;; @ XEmacs emulation
171 (or (fboundp 'functionp)
172 (defun functionp (obj)
173 "Returns t if OBJ is a function, nil otherwise.
174 \[emu.el; XEmacs emulating function]"
176 (byte-code-function-p obj)
177 (and (symbolp obj)(fboundp obj))
178 (and (consp obj)(eq (car obj) 'lambda))
186 (or (fboundp 'char-int)
187 (fset 'char-int (symbol-function 'identity))
189 (or (fboundp 'int-char)
190 (fset 'int-char (symbol-function 'identity))
194 ;;; @ for text/richtext and text/enriched
197 (cond ((or running-emacs-19_29-or-later running-xemacs-19_14-or-later)
199 (autoload 'richtext-decode "richtext")
200 (or (assq 'text/richtext format-alist)
204 '("Extended MIME text/richtext format."
205 "Content-[Tt]ype:[ \t]*text/richtext"
206 richtext-decode richtext-encode t enriched-mode))
210 ;; don't have enriched.el
211 (autoload 'richtext-decode "tinyrich")
212 (autoload 'enriched-decode "tinyrich")