From 5a56be26468ed06f649a62cac66805846a185131 Mon Sep 17 00:00:00 2001
From: akr <akr>
Date: Thu, 19 Mar 1998 10:30:55 +0000
Subject: [PATCH] (message-make-subject): New function.
 (message-subject-prefix-regexp): New variable.
 (message-subject-dont-modify-regexp): New variable.

---
 lisp/message.el |   55 +++++++++++++++++++++++++++++++++++++++++++++----------
 1 file changed, 45 insertions(+), 10 deletions(-)

diff --git a/lisp/message.el b/lisp/message.el
index 79b3367..5db1f9f 100644
--- a/lisp/message.el
+++ b/lisp/message.el
@@ -1159,6 +1159,49 @@ Return the number of headers removed."
 	     (1+ max)))))
       (message-sort-headers-1))))
 
+(defvar message-subject-dont-modify-regexp nil
+  "If non-nil and this regexp matches subject,
+use identical subject.")
+(setq message-subject-dont-modify-regexp-always-match "")
+(setq message-subject-dont-modify-regexp-encoded-re
+  (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]\\)"
+    "\\)"
+    ))
+
+(defvar message-subject-prefix-regexp "^[ \t]*[Rr][Ee]:[ \t]*"
+  "regexp that matches (maybe buggy) Re:")
+
+(defun message-make-subject (subject)
+  (cond
+    ;; If unremovable buggy Re: is found, do not attach additional Re:.
+   ((and message-subject-dont-modify-regexp
+         (string-match message-subject-dont-modify-regexp 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))))
+
 
 
 ;;;
@@ -3372,11 +3415,7 @@ 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))
@@ -3493,11 +3532,7 @@ 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