Fix bug #9392 with rmail-forward.

 lisp/simple.el (mail-encode-mml): New defvar.
 lisp/mail/rmail.el (mail-encode-mml): Add a defvar.
 (rmail-enable-mime-composing): Default to t.
 (rmail-forward): Use MIME method of forwarding only if both
 rmail-enable-mime-composing and rmail-enable-mime are non-nil.
 Set mail-encode-mml non-nil if the MIME method was used.
 lisp/mail/sendmail.el (mml-to-mime): Add autoload form.
 (mail-encode-mml): Add a defvar.
 (mail-mode): Make mail-encode-mml buffer-local and initialize it
 to nil.
 (mail-send): If mail-encode-mml is non-nil, run the outgoing
 message through mml-to-mime, and reset mail-encode-mml to nil.

4 files changed, 45 insertions, 4 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 7806877c6f5..04bc29bf1b0 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,21 @@
+2011-09-09  Eli Zaretskii  <eliz@gnu.org>
+
+        Fix for Savannah bug#9392.
+        * simple.el (mail-encode-mml): New defvar.
+
+        * mail/rmail.el (mail-encode-mml): Add a defvar.
+        (rmail-enable-mime-composing): Default to t.
+        (rmail-forward): Use MIME method of forwarding only if both
+        rmail-enable-mime-composing and rmail-enable-mime are non-nil.
+        Set mail-encode-mml non-nil if the MIME method was used.
+
+        * mail/sendmail.el (mml-to-mime): Add autoload form.
+        (mail-encode-mml): Add a defvar.
+        (mail-mode): Make mail-encode-mml buffer-local and initialize it
+        to nil.
+        (mail-send): If mail-encode-mml is non-nil, run the outgoing
+        message through mml-to-mime, and reset mail-encode-mml to nil.
+
 2011-09-09  Glenn Morris  <rgm@gnu.org>
 
         * woman.el (woman-if-body): When processing an .el block,
diff --git a/lisp/mail/rmail.el b/lisp/mail/rmail.el
index ac07f07a76b..db06de9be76 100644
--- a/lisp/mail/rmail.el
+++ b/lisp/mail/rmail.el
@@ -91,6 +91,7 @@ its character representation and its display representation.")
 (defvar messages-head)
 (defvar total-messages)
 (defvar tool-bar-map)
+(defvar mail-encode-mml)
 
 (defvar rmail-header-style 'normal
   "The current header display style choice, one of
@@ -642,7 +643,7 @@ unless the feature specified by `rmail-mime-feature' is available."
   :version "23.3"
   :group 'rmail)
 
-(defvar rmail-enable-mime-composing nil
+(defvar rmail-enable-mime-composing t
   "*If non-nil, RMAIL uses `rmail-insert-mime-forwarded-message-function' to forward.")
 
 ;; FIXME unused.
@@ -3794,9 +3795,17 @@ see the documentation of `rmail-resend'."
             ;; Insert after header separator--before signature if any.
             (rfc822-goto-eoh)
             (forward-line 1)
-            (if (or rmail-enable-mime rmail-enable-mime-composing)
-                (funcall rmail-insert-mime-forwarded-message-function
-                         forward-buffer)
+            (if (and rmail-enable-mime rmail-enable-mime-composing)
+                (prog1
+                    (funcall rmail-insert-mime-forwarded-message-function
+                             forward-buffer)
+                  ;; rmail-insert-mime-forwarded-message-function
+                  ;; works by inserting MML tags into forward-buffer.
+                  ;; The MUA will need to convert it to MIME before
+                  ;; sending.  mail-encode-mml tells them to do that.
+                  ;; message.el does that automagically.
+                  (or (eq mail-user-agent 'message-user-agent)
+                      (setq mail-encode-mml t)))
               (insert "------- Start of forwarded message -------\n")
               ;; Quote lines with `- ' if they start with `-'.
               (let ((beg (point)) end)
diff --git a/lisp/mail/sendmail.el b/lisp/mail/sendmail.el
index cb02a4b374d..f7dc01e8ebf 100644
--- a/lisp/mail/sendmail.el
+++ b/lisp/mail/sendmail.el
@@ -31,6 +31,9 @@
 
 (require 'rfc2047)
 
+(autoload 'mml-to-mime "mml"
+  "Translate the current buffer from MML to MIME.")
+
 (defgroup sendmail nil
   "Mail sending commands for Emacs."
   :prefix "mail-"
@@ -678,6 +681,7 @@ switching to, the `*mail*' buffer.  See also `mail-setup-hook'."
   :options '(footnote-mode))
 
 (defvar mail-mode-abbrev-table text-mode-abbrev-table)
+(defvar mail-encode-mml)
 ;;;###autoload
 (define-derived-mode mail-mode text-mode "Mail"
   "Major mode for editing mail to be sent.
@@ -701,6 +705,8 @@ Turning on Mail mode runs the normal hooks `text-mode-hook' and
   (make-local-variable 'mail-reply-action)
   (make-local-variable 'mail-send-actions)
   (make-local-variable 'mail-return-action)
+  (make-local-variable 'mail-encode-mml)
+  (setq mail-encode-mml nil)
   (setq buffer-offer-save t)
   (make-local-variable 'font-lock-defaults)
   (setq font-lock-defaults '(mail-font-lock-keywords t t))
@@ -934,6 +940,9 @@ the user from the mailer."
               (error "Invalid header line (maybe a continuation line lacks initial whitespace)"))
             (forward-line 1)))
         (goto-char opoint)
+        (when mail-encode-mml
+          (mml-to-mime)
+          (setq mail-encode-mml nil))
         (run-hooks 'mail-send-hook)
         (message "Sending...")
         (funcall send-mail-function)
diff --git a/lisp/simple.el b/lisp/simple.el
index 2d4f883f1ed..5b639f774cb 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -5729,6 +5729,11 @@ else the end of the last line.  This function obeys RFC822."
          "^\\([:\n]\\|[^: \t\n]+[ \t\n]\\)" nil 'move)
     (goto-char (match-beginning 0))))
 
+;; Used by Rmail (e.g., rmail-forward).
+(defvar mail-encode-mml nil
+  "If non-nil, mail-user-agent's `sendfunc' command should mml-encode
+the outgoing message before sending it.")
+
 (defun compose-mail (&optional to subject other-headers continue
                      switch-function yank-action send-actions
                      return-action)