2005-09-13 Chong Yidong <cyd@stupidchicken.com>

	* mail/sendmail.el (mail): Use new buffer if `noerase' argument is
	`new'.

2 files changed, 19 insertions, 4 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index ea8039d7c2f..f9abe4ca871 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,8 @@
+2005-09-13  Chong Yidong  <cyd@stupidchicken.com>
+
+        * mail/sendmail.el (mail): Use new buffer if `noerase' argument is
+        `new'.
+
 2005-09-12  Richard M. Stallman  <rms@gnu.org>
 
         * font-lock.el (font-lock-keywords): Add autoload.
diff --git a/lisp/mail/sendmail.el b/lisp/mail/sendmail.el
index f5c34ff80ca..32328a33177 100644
--- a/lisp/mail/sendmail.el
+++ b/lisp/mail/sendmail.el
@@ -1591,8 +1591,13 @@ is inserted.
 The normal hook `mail-setup-hook' is run after the message is
 initialized.  It can add more default fields to the message.
 
-When calling from a program, the first argument if non-nil says
-not to erase the existing contents of the `*mail*' buffer.
+The first argument, NOERASE, determines what to do when there is
+an existing modified `*mail*' buffer.  If NOERASE is nil, the
+existing mail buffer is used, and the user is prompted whether to
+keep the old contents or to erase them.  If NOERASE has the value
+`new', a new mail buffer will be created instead of using the old
+one.  Any other non-nil value means to always select the old
+buffer without erasing the contents.
 
 The second through fifth arguments,
  TO, SUBJECT, IN-REPLY-TO and CC, specify if non-nil
@@ -1649,7 +1654,11 @@ The seventh argument ACTIONS is a list of actions to take
 ;;;                (file-exists-p buffer-auto-save-file-name))
 ;;;           (message "Auto save file for draft message exists; consider M-x mail-recover"))
 ;;;          t))
-  (pop-to-buffer "*mail*")
+
+  (if (eq noerase 'new)
+      (pop-to-buffer (generate-new-buffer "*mail*"))
+    (pop-to-buffer "*mail*"))
+
   ;; Avoid danger that the auto-save file can't be written.
   (let ((dir (expand-file-name
               (file-name-as-directory mail-default-directory))))
@@ -1664,7 +1673,8 @@ The seventh argument ACTIONS is a list of actions to take
   ;; (in case the user has actually visited a file *mail*).
 ;  (set-visited-file-name nil)
   (let (initialized)
-    (and (not noerase)
+    (and (or (not noerase)
+             (eq noerase 'new))
          (if buffer-file-name
              (if (buffer-modified-p)
                  (when (y-or-n-p "Buffer has unsaved changes; reinitialize it and discard them? ")