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[elisp/apel.git] / mcharset.el

diff --git a/mcharset.el b/mcharset.el
index 5ce2108..04281e5 100644 (file)
--- a/mcharset.el
+++ b/mcharset.el
@@ -1,8 +1,8 @@
 ;;; mcharset.el --- MIME charset API
 
-;; Copyright (C) 1997,1998 Free Software Foundation, Inc.
+;; Copyright (C) 1997,1998,1999,2000 Free Software Foundation, Inc.
 
-;; Author: MORIOKA Tomohiko <morioka@jaist.ac.jp>
+;; Author: MORIOKA Tomohiko <tomo@m17n.org>
 ;; Keywords: emulation, compatibility, Mule
 
 ;; This file is part of APEL (A Portable Emacs Library).
@@ -19,61 +19,91 @@
 
 ;; 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.
+;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
 
 ;;; Code:
 
 (require 'poe)
+(require 'pcustom)
 
 (cond ((featurep 'mule)
-       (cond ((featurep 'xemacs)
-             (require 'mcs-xm)
-             )
-            ((>= emacs-major-version 20)
-             (require 'mcs-e20)
-             )
-            (t
-             ;; for MULE 1.* and 2.*
-             (require 'mcs-om)
-             ))
-       )
+       (if (>= emacs-major-version 20)
+          (require 'mcs-20)
+        ;; for MULE 1.* and 2.*
+        (require 'mcs-om)))
       ((boundp 'NEMACS)
        ;; for Nemacs and Nepoch
-       (require 'mcs-nemacs)
-       )
+       (require 'mcs-nemacs))
       (t
-       (require 'mcs-ltn1)
-       ))
+       (require 'mcs-ltn1)))
 
+(defcustom default-mime-charset-for-write
+  (if (mime-charset-p 'utf-8)
+      'utf-8
+    default-mime-charset)
+  "Default value of MIME-charset for encoding.
+It may be used when suitable MIME-charset is not found.
+It must be symbol."
+  :group 'i18n
+  :type 'mime-charset)
+
+(defcustom default-mime-charset-detect-method-for-write
+  nil
+  "Function called when suitable MIME-charset is not found to encode.
+It must be nil or function.
+If it is nil, variable `default-mime-charset-for-write' is used.
+If it is a function, interface must be (TYPE CHARSETS &rest ARGS).
+CHARSETS is list of charset.
+If TYPE is 'region, ARGS has START and END."
+  :group 'i18n
+  :type '(choice function (const nil)))
 
 (defun charsets-to-mime-charset (charsets)
   "Return MIME charset from list of charset CHARSETS.
-This function refers variable `charsets-mime-charset-alist'
-and `default-mime-charset'."
+Return nil if suitable mime-charset is not found."
   (if charsets
-      (or (catch 'tag
-           (let ((rest charsets-mime-charset-alist)
-                 cell)
-             (while (setq cell (car rest))
-               (if (catch 'not-subset
-                     (let ((set1 charsets)
-                           (set2 (car cell))
-                           obj)
-                       (while set1
-                         (setq obj (car set1))
-                         (or (memq obj set2)
-                             (throw 'not-subset nil))
-                         (setq set1 (cdr set1)))
-                       t))
-                   (throw 'tag (cdr cell)))
-               (setq rest (cdr rest)))))
-         default-mime-charset)))
+      (catch 'tag
+       (let ((rest charsets-mime-charset-alist)
+             cell)
+         (while (setq cell (car rest))
+           (if (catch 'not-subset
+                 (let ((set1 charsets)
+                       (set2 (car cell))
+                       obj)
+                   (while set1
+                     (setq obj (car set1))
+                     (or (memq obj set2)
+                         (throw 'not-subset nil))
+                     (setq set1 (cdr set1)))
+                   t))
+               (throw 'tag (cdr cell)))
+           (setq rest (cdr rest)))
+         ))))
+
+(defun find-mime-charset-by-charsets (charsets &optional mode &rest args)
+  "Like `charsets-to-mime-charset', but it does not return nil.
+
+When suitable mime-charset is not found and variable
+`default-mime-charset-detect-method-for-write' is not nil,
+`find-mime-charset-by-charsets' calls the variable as function and
+return the return value of the function.
+Interface of the function is (MODE CHARSETS &rest ARGS).
+
+When suitable mime-charset is not found and variable
+`default-mime-charset-detect-method-for-write' is nil,
+variable `default-mime-charset-for-write' is returned."
+  (or (charsets-to-mime-charset charsets)
+      (if default-mime-charset-detect-method-for-write
+         (apply default-mime-charset-detect-method-for-write
+                mode charsets args)
+       default-mime-charset-for-write)))
 
 
 ;;; @ end
 ;;;
 
-(provide 'mcharset)
+(require 'product)
+(product-provide (provide 'mcharset) (require 'apel-ver))
 
 ;;; mcharset.el ends here