1 ;;; mcharset.el --- MIME charset API
3 ;; Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
5 ;; Author: MORIOKA Tomohiko <tomo@m17n.org>
6 ;; Keywords: emulation, compatibility, Mule
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.
30 (cond ((featurep 'mule)
31 (if (>= emacs-major-version 20)
33 ;; for MULE 1.* and 2.*
36 ;; for Nemacs and Nepoch
37 (require 'mcs-nemacs))
41 (defcustom default-mime-charset-for-write
42 (if (and (fboundp 'find-coding-system)
43 (find-coding-system 'utf-8))
46 "Default value of MIME-charset for encoding.
47 It may be used when suitable MIME-charset is not found.
52 (defcustom default-mime-charset-detect-method-for-write
54 "Function called when suitable MIME-charset is not found to encode.
55 It must be nil or function.
56 If it is nil, variable `default-mime-charset-for-write' is used.
57 If it is a function, interface must be (TYPE CHARSETS &rest ARGS).
58 CHARSETS is list of charset.
59 If TYPE is 'region, ARGS has START and END."
61 :type '(choice function (const nil)))
63 (defun charsets-to-mime-charset (charsets)
64 "Return MIME charset from list of charset CHARSETS.
65 Return nil if suitable mime-charset is not found."
68 (let ((rest charsets-mime-charset-alist)
70 (while (setq cell (car rest))
71 (if (catch 'not-subset
78 (throw 'not-subset nil))
79 (setq set1 (cdr set1)))
81 (throw 'tag (cdr cell)))
82 (setq rest (cdr rest)))
85 (defun find-mime-charset-by-charsets (charsets &optional mode &rest args)
86 "Like `charsets-to-mime-charset', but it does not return nil.
88 When suitable mime-charset is not found and variable
89 `default-mime-charset-detect-method-for-write' is not nil,
90 `find-mime-charset-by-charsets' calls the variable as function and
91 return the return value of the function.
92 Interface of the function is (MODE CHARSETS &rest ARGS).
94 When suitable mime-charset is not found and variable
95 `default-mime-charset-detect-method-for-write' is nil,
96 variable `default-mime-charset-for-write' is returned."
97 (or (charsets-to-mime-charset charsets)
98 (if default-mime-charset-detect-method-for-write
99 (apply default-mime-charset-detect-method-for-write
101 default-mime-charset-for-write)))
108 (product-provide (provide 'mcharset) (require 'apel-ver))
110 ;;; mcharset.el ends here