X-Git-Url: http://git.chise.org/gitweb/?a=blobdiff_plain;f=mcharset.el;h=156c34e7763e3b17a9466a4cc57ed25baed57e9b;hb=f601b82c55f8002e6c1044193d10041f62792f2a;hp=5ce21087a925cfaafd76366fd315cea07d6a3b02;hpb=0df64d3b6ef5ae5212fd59ee13dd5f044b378ba6;p=elisp%2Fapel.git

diff --git a/mcharset.el b/mcharset.el
index 5ce2108..156c34e 100644
--- 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 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).
@@ -25,6 +25,7 @@
 ;;; Code:
 
 (require 'poe)
+(require 'pcustom)
 
 (cond ((featurep 'mule)
        (cond ((featurep 'xemacs)
@@ -46,34 +47,73 @@
        (require 'mcs-ltn1)
        ))
 
+(defcustom default-mime-charset-for-write
+  (if (and (fboundp 'find-coding-system)
+	   (find-coding-system '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