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+;;; gnus-i18n.el --- Internationalization for Gnus
+
+;; Copyright (C) 1996,1997 Free Software Foundation, Inc.
+
+;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
+;; Created: 1997/11/27
+;; Keywords: internationalization, news, mail
+
+;; This file is not part of GNU Emacs yet.
+
+;; 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.
+
+;;; Code:
+
+;;; @ newsgroup default charset
+;;;
+
+(defvar gnus-newsgroup-default-charset-alist
+  '(("^\\(fj\\|tnn\\|japan\\)\\."      . iso-2022-jp-2)
+    ("^han\\."                         . euc-kr)
+    ("^relcom\\."                      . koi8-r)
+    ("^alt\\.chinese\\.text\\.big5"    . cn-big5)
+    ("^hk\\(star\\)?\\."               . cn-big5)
+    ("^tw\\."                          . cn-big5)
+    ("^alt\\.chinese"                  . hz-gb-2312)
+    )
+  "Alist of newsgroup patterns vs. corresponding default MIME charset.
+Each element looks like (REGEXP . SYMBOL).  REGEXP is pattern for
+newsgroup name.  SYMBOL is MIME charset or coding-system.")
+
+(defun gnus-set-newsgroup-default-charset (newsgroup charset)
+  "Set CHARSET for the NEWSGROUP as default MIME charset."
+  (let* ((ng-regexp (concat "^" (regexp-quote newsgroup) "\\($\\|\\.\\)"))
+        (pair (assoc ng-regexp gnus-newsgroup-default-charset-alist))
+        )
+    (if pair
+       (setcdr pair charset)
+      (setq gnus-newsgroup-default-charset-alist
+           (cons (cons ng-regexp charset)
+                 gnus-newsgroup-default-charset-alist))
+      )))
+
+
+;;; @ localization
+;;;
+
+(defun gnus-set-summary-default-charset ()
+  "Set up `default-mime-charset' of summary buffer.
+It is specified by variable `gnus-newsgroup-default-charset-alist'
+\(cf. function `gnus-set-newsgroup-default-charset')."
+  (if (buffer-live-p gnus-summary-buffer)
+      (let ((charset
+            (catch 'found
+              (let ((group
+                     (save-excursion
+                       (set-buffer gnus-summary-buffer)
+                       gnus-newsgroup-name))
+                    (alist gnus-newsgroup-default-charset-alist))
+                (while alist
+                  (let ((pair (car alist)))
+                    (if (string-match (car pair) group)
+                        (throw 'found (cdr pair))
+                      ))
+                  (setq alist (cdr alist)))
+                ))))
+       (when charset
+         (save-excursion
+           (set-buffer gnus-summary-buffer)
+           (make-local-variable 'default-mime-charset)
+           (setq default-mime-charset charset)
+           )
+         (make-local-variable 'default-mime-charset)
+         (setq default-mime-charset charset)
+         ))))
+
+
+;;; @ end
+;;;
+
+(provide 'gnus-i18n)
+
+;;; gnus-i18n.el ends here