--- /dev/null
+;;; mcs-20.el --- MIME charset implementation for Emacs 20 and XEmacs/mule
+
+;; Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
+
+;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
+;; Keywords: emulation, compatibility, Mule
+
+;; This file is part of APEL (A Portable Emacs Library).
+
+;; This program 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.
+
+;; This program 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 GNU Emacs; see the file COPYING. If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;; This module requires Emacs 20.0.93, XEmacs 20.3-b5 (with mule)
+;; or later.
+
+;;; Code:
+
+(require 'poem)
+(require 'pcustom)
+(eval-when-compile (require 'wid-edit))
+
+
+;;; @ MIME charset
+;;;
+
+(defcustom mime-charset-coding-system-alist
+ (let ((rest
+ '((us-ascii . raw-text)
+ (gb2312 . cn-gb-2312)
+ (cn-gb . cn-gb-2312)
+ (iso-2022-jp-2 . iso-2022-7bit-ss2)
+ (iso-2022-jp-3 . iso-2022-7bit-ss2)
+ (tis-620 . tis620)
+ (windows-874 . tis-620)
+ (cp874 . tis-620)
+ (x-ctext . ctext)
+ (unknown . undecided)
+ (x-unknown . undecided)
+ ))
+ dest)
+ (while rest
+ (let ((pair (car rest)))
+ (or (find-coding-system (car pair))
+ (setq dest (cons pair dest))
+ ))
+ (setq rest (cdr rest))
+ )
+ dest)
+ "Alist MIME CHARSET vs CODING-SYSTEM.
+MIME CHARSET and CODING-SYSTEM must be symbol."
+ :group 'i18n
+ :type '(repeat (cons symbol coding-system)))
+
+(defcustom mime-charset-to-coding-system-default-method
+ nil
+ "Function called when suitable coding-system is not found from MIME-charset.
+It must be nil or function.
+If it is a function, interface must be (CHARSET LBT CODING-SYSTEM)."
+ :group 'i18n
+ :type '(choice function (const nil)))
+
+(defun mime-charset-to-coding-system (charset &optional lbt)
+ "Return coding-system corresponding with CHARSET.
+CHARSET is a symbol whose name is MIME charset.
+If optional argument LBT (`CRLF', `LF', `CR', `unix', `dos' or `mac')
+is specified, it is used as line break code type of coding-system."
+ (if (stringp charset)
+ (setq charset (intern (downcase charset)))
+ )
+ (let ((cs (assq charset mime-charset-coding-system-alist)))
+ (setq cs
+ (if cs
+ (cdr cs)
+ charset))
+ (if lbt
+ (setq cs (intern (format "%s-%s" cs
+ (cond ((eq lbt 'CRLF) 'dos)
+ ((eq lbt 'LF) 'unix)
+ ((eq lbt 'CR) 'mac)
+ (t lbt)))))
+ )
+ (if (find-coding-system cs)
+ cs
+ (if mime-charset-to-coding-system-default-method
+ (funcall mime-charset-to-coding-system-default-method
+ charset lbt cs)
+ ))))
+
+(defvar widget-mime-charset-prompt-value-history nil
+ "History of input to `widget-mime-charset-prompt-value'.")
+
+(define-widget 'mime-charset 'coding-system
+ "A mime-charset."
+ :format "%{%t%}: %v"
+ :tag "MIME-charset"
+ :prompt-history 'widget-mime-charset-prompt-value-history
+ :prompt-value 'widget-mime-charset-prompt-value
+ :action 'widget-mime-charset-action)
+
+(defun widget-mime-charset-prompt-value (widget prompt value unbound)
+ ;; Read mime-charset from minibuffer.
+ (intern
+ (completing-read (format "%s (default %s) " prompt value)
+ (mapcar (function
+ (lambda (sym)
+ (list (symbol-name sym))))
+ (mime-charset-list)))))
+
+(defun widget-mime-charset-action (widget &optional event)
+ ;; Read a mime-charset from the minibuffer.
+ (let ((answer
+ (widget-mime-charset-prompt-value
+ widget
+ (widget-apply widget :menu-tag-get)
+ (widget-value widget)
+ t)))
+ (widget-value-set widget answer)
+ (widget-apply widget :notify widget event)
+ (widget-setup)))
+
+(defcustom default-mime-charset 'x-ctext
+ "Default value of MIME-charset.
+It is used when MIME-charset is not specified.
+It must be symbol."
+ :group 'i18n
+ :type 'mime-charset)
+
+(defun detect-mime-charset-region (start end)
+ "Return MIME charset for region between START and END."
+ (find-mime-charset-by-charsets (find-charset-region start end)
+ 'region start end))
+
+(defun write-region-as-mime-charset (charset start end filename
+ &optional append visit lockname)
+ "Like `write-region', q.v., but encode by MIME CHARSET."
+ (let ((coding-system-for-write
+ (or (mime-charset-to-coding-system charset)
+ 'binary)))
+ (write-region start end filename append visit lockname)))
+
+
+;;; @ end
+;;;
+
+(require 'product)
+(product-provide (provide 'mcs-20) (require 'apel-ver))
+
+;;; mcs-20.el ends here
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