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Buffers not deleted correctly with server/emacsclient

From: daniel dever
Subject: Buffers not deleted correctly with server/emacsclient
Date: Fri, 8 Aug 2003 13:50:46 -0400

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English, because the Emacs maintainers do not have
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Your bug report will be posted to the address@hidden mailing list,
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In GNU Emacs 21.2.1 (i686-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2002-05-27 on s0022
configured using `configure  --prefix=/proj/usertools/ia32_linux/'
Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: en_US
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

from shell tcsh on Linux (er, GNU/Linux :-):
    > setenv EDITOR emacsclient
    > emacs -q -f server-start &
    > more phone_listing.txt
      v     [in more]
      C-x # [in emacs]
      [Notice that buffer is buried, but _not_ deleted in emacs,
       as it should be.]

The value of server-kill-new-buffers is t.

I believe the problem is that server-buffer-done in
server.el checks for server-existing-buffer instead of
(not server-existing-buffer).  I've included a copy of
that function with this change made to it.

The function now seems to work, but be warned that I
haven't spent much effort testing it.

Search for DED to locate my change.

/Dan Dever

;; Here is the documentation for server-kill-new-buffers:
;;      Documentation:
;;      *Whether to kill buffers when done with them.
;;      If non-nil, kill a buffer unless it already existed before editing
;;      it with Emacs server. If nil, kill only buffers as specified by
;;      `server-temp-file-regexp'.
;;      Please note that only buffers are killed that still have a client,
;;      i.e. buffers visited which "emacsclient --no-wait" are never killed in
;;      this way.
;;      You can customize this variable.
;;      Defined in `server'.
;; However, the opposite was happening.  The buffer was only being deleted
;; if it did already exist.
;; Search for 'DED' to see my change.

(defun server-buffer-done (buffer &optional for-killing)
  "Mark BUFFER as \"done\" for its client(s).
This buries the buffer, then returns a list of the form (NEXT-BUFFER KILLED).
NEXT-BUFFER is another server buffer, as a suggestion for what to select next,
or nil.  KILLED is t if we killed BUFFER
\(typically, because it was visiting a temp file)."
  (let ((running (eq (process-status server-process) 'run))
        (next-buffer nil)
        (killed nil)
        (first t)
        (old-clients server-clients))
    (while old-clients
      (let ((client (car old-clients)))
        (or next-buffer 
            (setq next-buffer (nth 1 (memq buffer client))))
        (delq buffer client)
        ;; Delete all dead buffers from CLIENT.
        (let ((tail client))
          (while tail
            (and (bufferp (car tail))
                 (null (buffer-name (car tail)))
                 (delq (car tail) client))
            (setq tail (cdr tail))))
        ;; If client now has no pending buffers,
        ;; tell it that it is done, and forget it entirely.
        (if (cdr client) nil
          (if running
                ;; Don't send emacsserver two commands in close succession.
                ;; It cannot handle that.
                (or first (sit-for 1))
                (setq first nil)
                (send-string server-process 
                             (format "Close: %s Done\n" (car client)))
                (server-log (format "Close: %s Done\n" (car client)))))
          (setq server-clients (delq client server-clients))))
      (setq old-clients (cdr old-clients)))
    (if (and (bufferp buffer) (buffer-name buffer))
        ;; We may or may not kill this buffer;
        ;; if we do, do not call server-buffer-done recursively
        ;; from kill-buffer-hook.
        (let ((server-kill-buffer-running t))
            (set-buffer buffer)
            (setq server-buffer-clients nil)
            (run-hooks 'server-done-hook))
          ;; Notice whether server-done-hook killed the buffer.
          (if (null (buffer-name buffer))
              (setq killed t)
            ;; Don't bother killing or burying the buffer
            ;; when we are called from kill-buffer.
            (unless for-killing
              (when (and (not killed)
                         ;; DED: Added the 'not' 8 August 2003
                         (not (save-excursion
                                (set-buffer buffer)
                (setq killed t)
                (bury-buffer buffer)
                (kill-buffer buffer))
              (unless killed
                (if (server-temp-file-p buffer)
                      (kill-buffer buffer)
                      (setq killed t))
                  (bury-buffer buffer)))))))
    (list next-buffer killed)))

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