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emu-20.el
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emu-20.el
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;;; emu-20.el --- emu API implementation for Emacs 20 and XEmacs/mule
;; Copyright (C) 1997 Free Software Foundation, Inc.
;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
;; Version: $Id$
;; Keywords: emulation, compatibility, Mule
;; This file is part of emu.
;; 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 'custom)
;;; @ binary access
;;;
(defmacro as-binary-process (&rest body)
`(let (selective-display ; Disable ^M to nl translation.
(coding-system-for-read 'binary)
(coding-system-for-write 'binary))
,@body))
(defmacro as-binary-input-file (&rest body)
`(let ((coding-system-for-read 'binary))
,@body))
(defmacro as-binary-output-file (&rest body)
`(let ((coding-system-for-write 'binary))
,@body))
(defun insert-binary-file-contents-literally
(filename &optional visit beg end replace)
"Like `insert-file-contents-literally', q.v., but don't code conversion.
A buffer may be modified in several ways after reading into the buffer due
to advanced Emacs features, such as file-name-handlers, format decoding,
find-file-hooks, etc.
This function ensures that none of these modifications will take place."
(let ((coding-system-for-read 'binary))
(insert-file-contents-literally filename visit beg end replace)
))
;;; @@ Mule emulating aliases
;;;
;;; You should not use it.
(defconst *noconv* 'binary
"Coding-system for binary.
This constant is defined to emulate old MULE anything older than MULE
2.3. It is obsolete, so don't use it.")
;;; @ MIME charset
;;;
(defvar mime-charset-coding-system-alist
`,(let ((rest
'((us-ascii . iso-8859-1)
(gb2312 . cn-gb-2312)
(iso-2022-jp-2 . iso-2022-7bit-ss2)
(x-ctext . ctext)
))
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.")
(defsubst 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 (`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 ((ret (assq charset mime-charset-coding-system-alist)))
(if ret
(setq charset (cdr ret))
))
(if lbt
(setq charset (intern (format "%s-%s" charset lbt)))
)
(if (find-coding-system charset)
charset))
(defsubst mime-charset-list ()
"Return a list of all existing MIME-charset."
(nconc (mapcar (function car) mime-charset-coding-system-alist)
(coding-system-list)))
(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)
(defsubst detect-mime-charset-region (start end)
"Return MIME charset for region between START and END."
(charsets-to-mime-charset (find-charset-region start end)))
;;; @ end
;;;
(provide 'emu-20)
;;; emu-20.el ends here