From c05e3e444215a3f6eeedfb48b00e0b1fd8fb76dd Mon Sep 17 00:00:00 2001
From: akr <akr>
Date: Tue, 28 Apr 1998 11:42:43 +0000
Subject: [PATCH] * lisp/gnus-i18n.el (gnus-set-summary-default-charset):
 Delete buffer-local binding of `default-mime-charset' when
 the newsgroup doesn't match
 `gnus-newsgroup-default-charset-alist'.

* lisp/message.el (message-subject-guess-encoded-re-regexp): New
constant.
(message-followup-subject): New custom variable.
(message-subject-prefix-regexp): New variable.
(message-make-subject): New function.
(message-reply): Use `message-make-subject'.
(message-followup): Use `message-make-subject'.
---
 lisp/gnus-i18n.el |   16 ++++++-------
 lisp/message.el   |   65 ++++++++++++++++++++++++++++++++++++++++++++---------
 2 files changed, 63 insertions(+), 18 deletions(-)

diff --git a/lisp/gnus-i18n.el b/lisp/gnus-i18n.el
index 3737fb9..5126a0a 100644
--- a/lisp/gnus-i18n.el
+++ b/lisp/gnus-i18n.el
@@ -76,15 +76,15 @@ It is specified by variable `gnus-newsgroup-default-charset-alist'
 		       ))
 		   (setq alist (cdr alist)))
 		 ))))
-	(when charset
-	  (save-excursion
-	    (set-buffer gnus-summary-buffer)
+	(if charset
+	  (progn
+	    (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)
-	    )
-	  (make-local-variable 'default-mime-charset)
-	  (setq default-mime-charset charset)
-	  ))))
+	    (setq default-mime-charset charset))
+	  (kill-local-variable 'default-mime-charset)))))
 
 
 ;;; @ end
diff --git a/lisp/message.el b/lisp/message.el
index 9605ff5..742ebde 100644
--- a/lisp/message.el
+++ b/lisp/message.el
@@ -1164,6 +1164,59 @@ Return the number of headers removed."
 	     (1+ max)))))
       (message-sort-headers-1))))
 
+(defconst message-subject-guess-encoded-re-regexp
+  (concat
+   "^[ \t]*"
+   (regexp-quote "=?")
+   mime-charset-regexp ; from semi/mime-def.el
+   (regexp-quote "?")
+   "\\("
+   "[Bb]" (regexp-quote "?")
+   "\\(\\(CQk\\|CSA\\|IAk\\|ICA\\)[Jg]\\)*" ; \([ \t][ \t][ \t]\)*
+   "\\("
+   "[Uc][km]U6" ; [Rr][Ee]:
+   "\\|"
+   "\\(C[VX]\\|I[FH]\\)J[Fl]O[g-v]" ; [ \t][Rr][Ee]:
+   "\\|"
+   "\\(CQl\\|CSB\\|IAl\\|ICB\\)[Sy][RZ]T[o-r]" ; [ \t][ \t][Rr][Ee]:
+   "\\)"
+   "\\|"
+   "[Qb]" (regexp-quote "?")
+   "\\(_\\|=09\\|=20\\)*"
+   "\\([Rr]\\|=[57]2\\)\\([Ee]\\|=[46]5\\)\\(:\\|=3[Aa]\\)"
+   "\\)"
+   ))
+
+(defcustom message-followup-subject nil
+  "*If non-nil and this regexp matches subject,
+use identical subject.
+
+If the value is symbol, use its symbol-value."
+  :group 'message-various
+  :type '(choice (const :tag "Prepend Re: unless already has" nil)
+		 (const :tag "Never prepend Re:" "")
+		 (const :tag "Guess encoded Re:"
+			message-subject-guess-encoded-re-regexp)))
+
+(defvar message-subject-prefix-regexp "^[ \t]*[Rr][Ee]:[ \t]*"
+  "regexp that matches (maybe buggy) Re:")
+
+(defun message-make-subject (subject)
+  (let ((message-followup-subject (if (symbolp message-followup-subject)
+				      (symbol-value message-followup-subject)
+				      message-followup-subject)))
+    (cond
+      ;; If unremovable buggy Re: is found, do not prepend additional Re:.
+     ((and message-followup-subject
+	   (string-match message-followup-subject subject))
+      subject)
+      ;; Remove any (buggy) Re:'s that are present and make a
+      ;; proper one.
+     ((string-match message-subject-prefix-regexp subject)
+      (concat "Re: " (substring subject (match-end 0))))
+     (t
+      (concat "Re: " subject)))))
+
 
 
 ;;;
@@ -3390,11 +3443,7 @@ Headers already prepared in the buffer are not modified."
 	    reply-to (unless ignore-reply-to (message-fetch-field "reply-to"))
 	    references (message-fetch-field "references")
 	    message-id (message-fetch-field "message-id" t))
-      ;; Remove any (buggy) Re:'s that are present and make a
-      ;; proper one.
-      (when (string-match "^[ \t]*[Rr][Ee]:[ \t]*" subject)
-	(setq subject (substring subject (match-end 0))))
-      (setq subject (concat "Re: " subject))
+      (setq subject (message-make-subject subject))
 
       (when (and (setq gnus-warning (message-fetch-field "gnus-warning"))
 		 (string-match "<[^>]+>" gnus-warning))
@@ -3511,11 +3560,7 @@ If TO-NEWSGROUPS, use that as the new Newsgroups line."
 		 (let ((case-fold-search t))
 		   (string-match "world" distribution)))
 	(setq distribution nil))
-      ;; Remove any (buggy) Re:'s that are present and make a
-      ;; proper one.
-      (when (string-match "^[ \t]*[Rr][Ee]:[ \t]*" subject)
-	(setq subject (substring subject (match-end 0))))
-      (setq subject (concat "Re: " subject))
+      (setq subject (message-make-subject subject))
       (widen))
 
     (message-pop-to-buffer (message-buffer-name "followup" from newsgroups))
-- 
1.7.10.4