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with-output-to-temp-buffer and let variable bindings

From: Stefan Reichör
Subject: with-output-to-temp-buffer and let variable bindings
Date: Wed, 05 Mar 2003 09:12:38 +0100
User-agent: Gnus/5.090016 (Oort Gnus v0.16) Emacs/21.3.50 (windows-nt)

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Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the address@hidden mailing list.

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

I use the latest emacs from CVS under windows.
I use bbdb and I found out, that the bbdb append feature does not
work with my emacs.
I tried the same feature on my debian box with the latest debian
emacs packages. It works on debian.

Here is the recipe for the test (in a bbdb buffer):
I type:
b search-string1 <RET>
+ b search-string2 <RET>

But the second search always clears the first one and I get only the
results of the second search.

On linux (emacs21.2.2) I get the correct result:
records with search-string1 and search-string2 are shown.

I started to debug the bbdb query.
Here is, what I found out:
* In the function bbdb-display-records-1, there is a call to
* Before the call to this function, the variable bbdb-records
  contains the already visible bbdb-entries.
* After the call to with-output-to-temp-buffer, the variable
  bbdb-records is nil
  + On linux this variable has still the same value as before
  + I fixed the problem with the new variable xbbdb-records
* My question is now, is this a bug of with-output-to-temp-buffer?

My changed function looks like this:

(defun bbdb-display-records-1 (records &optional append layout)
  (setq append (or append (bbdb-append-records-p)))
  (if (or (null records)
          (consp (car records)))

    ;; add layout and a marker to the local list of records
    (setq layout (or layout bbdb-display-layout))
    (setq records (mapcar (lambda (x)
                            (list x layout (make-marker)))

  (let ((b (current-buffer))
        (temp-buffer-setup-hook nil)
        (temp-buffer-show-hook nil)
        (xbbdb-records (copy-alist bbdb-records))
        (first (car (car records))))
    ;;(message "xbbdb-records: %S" xbbdb-records)
    ;;(message "bbdb-records: %S" bbdb-records)

    ;;05.03.2003, XSteve, with-output-to-temp-buffer seems to
    ;; destroy the binding of bbdb-records on windows emacs, cvs version...
    ;; so use xbbdb-records - this works
    (with-output-to-temp-buffer bbdb-buffer-name
      (set-buffer bbdb-buffer-name)
      ;;(message "xbbdb-records: %S" xbbdb-records)
      ;;(message "bbdb-records: %S" bbdb-records)
      ;; If append is unset, clear the buffer.
      (unless append

      ;; If we're appending these records to the ones already displayed,
      ;; then first remove any duplicates, and then sort them.
      (if append
          (let ((rest records))
            (while rest
              (if (assq (car (car rest)) xbbdb-records)
                  (setq records (delq (car rest) records)))
              (setq rest (cdr rest)))
            (setq records (append xbbdb-records records))
            (setq records
                  (sort records
                        (lambda (x y) (bbdb-record-lessp (car x) (car y)))))))
      (make-local-variable 'mode-line-buffer-identification)
      (make-local-variable 'mode-line-modified)
      (set (make-local-variable 'bbdb-showing-changed-ones) nil)
      (let ((done nil)
            (rest records)
            (changed (bbdb-changed-records)))
        (while (and rest (not done))
          (setq done (memq (car (car rest)) changed)
                rest (cdr rest)))
        (setq bbdb-showing-changed-ones done))
      (bbdb-frob-mode-line (length records))
      (and (not bbdb-gag-messages)
           (not bbdb-silent-running)
           (message "Formatting..."))
      ;; this in in the *BBDB* buffer, remember, not the .bbdb buffer.
      (set (make-local-variable 'bbdb-records) nil)
      (setq bbdb-records records)
      (let ((buffer-read-only nil)
        (bbdb-debug (setq prs (bbdb-records)))
        (setq truncate-lines t)
        (while records
          (bbdb-debug (if (not (memq (car (car records)) prs))
                          (error "record doubleplus unpresent!")))
          (set-marker (nth 2 (car records)) (point))
          (bbdb-format-record (nth 0 (car records))
                              (nth 1 (car records)))
          (setq records (cdr records))))
      (and (not bbdb-gag-messages)
           (not bbdb-silent-running)
           (message "Formatting...done."))
    (set-buffer bbdb-buffer-name)
    (if (and append first)
        (let ((cons (assq first bbdb-records))
              (window (get-buffer-window (current-buffer))))
          (if window (set-window-start window (nth 2 cons)))))
    ;; this doesn't really belong here, but it's convenient ... and when
    ;; using electric display it would not be called otherwise.
    (save-excursion (run-hooks 'bbdb-list-hook))
    (if bbdb-gui (bbdb-fontify-buffer))
    (set-buffer-modified-p nil)
    (setq buffer-read-only t)
    (set-buffer b)))

In GNU Emacs (i386-msvc-nt5.0.2195)
 of 2003-02-19 on HEIDI
configured using `configure --with-msvc (12.00)'

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: DEA
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

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