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;;; 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)
(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
;;;
(provide 'mcs-20)
;;; mcs-20.el ends here
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