Use temp-buffers when not displaying the diary.

* lisp/calendar/diary-lib.el (diary-list-entries): Use temp buffers when
not displaying the diary.
(diary-add-to-list): If no buffer-file-name, fall back to diary-file.
* lisp/calendar/appt.el (appt-check): No longer need to kill diary.

3 files changed, 85 insertions, 84 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 5d65ecf5987..655e4d1b240 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,5 +1,10 @@
 2010-09-29  Glenn Morris  <rgm@gnu.org>
 
+        * calendar/diary-lib.el (diary-list-entries): Use temp buffers when
+        not displaying the diary.
+        (diary-add-to-list): If no buffer-file-name, fall back to diary-file.
+        * calendar/appt.el (appt-check): No longer need to kill diary.
+
         * calendar/diary-lib.el (diary-list-entries): Move the
         "Preparing..." message entirely here.
         (diary-simple-display, diary-fancy-display): Move "Preparing..."
diff --git a/lisp/calendar/appt.el b/lisp/calendar/appt.el
index 4926e79c2b5..cd0f049027b 100644
--- a/lisp/calendar/appt.el
+++ b/lisp/calendar/appt.el
@@ -257,8 +257,6 @@ The variable `appt-audible' controls the audible reminder."
            (message "%s" string)))))
 
 
-(defvar diary-selective-display)
-
 (defun appt-check (&optional force)
   "Check for an appointment and update any reminder display.
 If optional argument FORCE is non-nil, reparse the diary file for
@@ -326,7 +324,7 @@ displayed in a window:
          (mode-line-only (unless full-check appt-now-displayed))
          now cur-comp-time appt-comp-time appt-warn-time)
     (when (or full-check mode-line-only)
-      (save-excursion
+      (save-excursion                   ; FIXME ?
         ;; Convert current time to minutes after midnight (12.01am = 1).
         (setq now (decode-time)
               cur-comp-time (+ (* 60 (nth 2 now)) (nth 1 now)))
@@ -337,23 +335,13 @@ displayed in a window:
             (ignore-errors
               (let ((diary-hook (if (assoc 'appt-make-list diary-hook)
                                     diary-hook
-                                  (cons 'appt-make-list diary-hook)))
-                    d-buff d-buff2)
+                                  (cons 'appt-make-list diary-hook))))
                 (if appt-display-diary
                     (diary)
-                  (setq d-buff (find-buffer-visiting diary-file))
                   ;; Not displaying the diary, so we can ignore
                   ;; diary-number-of-entries.  Since appt.el only
                   ;; works on a daily basis, no need for more entries.
-                  (diary-list-entries (calendar-current-date) 1 t)
-                  ;; If diary buffer did not exist before this command, kill it.
-                  ;; FIXME does not kill any included diary files.
-                  ;; The real issue is that (diary) should not have
-                  ;; the side effect of visiting all the diary files.
-                  ;; It is not really appt.el's job to clean up this mess...
-                  (and (not d-buff)
-                       (setq d-buff2 (find-buffer-visiting diary-file))
-                       (kill-buffer d-buff2))))))
+                  (diary-list-entries (calendar-current-date) 1 t)))))
         (setq appt-prev-comp-time cur-comp-time
               appt-mode-string nil
               appt-display-count nil)
diff --git a/lisp/calendar/diary-lib.el b/lisp/calendar/diary-lib.el
index 37af75a7164..ddabeb7dbad 100644
--- a/lisp/calendar/diary-lib.el
+++ b/lisp/calendar/diary-lib.el
@@ -594,19 +594,20 @@ The entry is added to the list as (DATE STRING SPECIFIER LOCATOR
 GLOBCOLOR), where LOCATOR has the form (MARKER FILENAME LITERAL),
 FILENAME being the file containing the diary entry."
   (when (and date string)
-    (if diary-file-name-prefix
-        (let ((prefix (funcall diary-file-name-prefix-function
-                               (buffer-file-name))))
-          (or (string-equal prefix "")
-              (setq string (format "[%s] %s" prefix string)))))
-    (and diary-modify-entry-list-string-function
-         (setq string (funcall diary-modify-entry-list-string-function
-                               string)))
-    (setq diary-entries-list
-          (append diary-entries-list
-                  (list (list date string specifier
-                              (list marker (buffer-file-name) literal)
-                              globcolor))))))
+    ;; b-f-n is nil if we are visiting an include file in a temp-buffer.
+    (let ((dfile (or (buffer-file-name) diary-file)))
+      (if diary-file-name-prefix
+          (let ((prefix (funcall diary-file-name-prefix-function dfile)))
+            (or (string-equal prefix "")
+                (setq string (format "[%s] %s" prefix string)))))
+      (and diary-modify-entry-list-string-function
+           (setq string (funcall diary-modify-entry-list-string-function
+                                 string)))
+      (setq diary-entries-list
+            (append diary-entries-list
+                    (list (list date string specifier
+                                (list marker dfile literal)
+                                globcolor)))))))
 
 (define-obsolete-function-alias 'add-to-diary-list 'diary-add-to-list "23.1")
 
@@ -760,65 +761,72 @@ LIST-ONLY is non-nil, in which case it just returns the list."
            (diary-buffer (find-buffer-visiting diary-file))
            ;; Dynamically bound in diary-include-other-diary-files.
            (d-incp (and (boundp 'diary-including) diary-including))
-           diary-entries-list file-glob-attrs)
+           diary-entries-list file-glob-attrs temp-buff)
       (unless d-incp
         (setq diary-included-files nil)
         (message "Preparing diary..."))
-      (save-current-buffer
-        (if (not diary-buffer)
-            (set-buffer (find-file-noselect diary-file t))
-          (set-buffer diary-buffer)
-          (or (verify-visited-file-modtime diary-buffer)
-              (revert-buffer t t)))
-        ;; Setup things like the header-line-format and invisibility-spec.
-        (if (eq major-mode (default-value 'major-mode))
-            (diary-mode)
-          ;; This kludge is to make customizations to
-          ;; diary-header-line-flag after diary has been displayed
-          ;; take effect. Unconditionally calling (diary-mode)
-          ;; clobbers file local variables.
-          ;; http://lists.gnu.org/archive/html/emacs-pretest-bug/2007-03/msg00363.html
-          ;; http://lists.gnu.org/archive/html/emacs-pretest-bug/2007-04/msg00404.html
-          (if (eq major-mode 'diary-mode)
-              (setq header-line-format (and diary-header-line-flag
-                                            diary-header-line-format))))
-        ;; d-s-p is passed to the diary display function.
-        (let ((diary-saved-point (point)))
-          (save-excursion
-            (save-restriction
-              (widen)                   ; bug#5093
-              (setq file-glob-attrs (cadr (diary-pull-attrs nil "")))
-              (with-syntax-table diary-syntax-table
-                (goto-char (point-min))
-                (unless list-only
-                  (let ((ol (make-overlay (point-min) (point-max) nil t nil)))
-                    (set (make-local-variable 'diary-selective-display) t)
-                    (overlay-put ol 'invisible 'diary)
-                    (overlay-put ol 'evaporate t)))
-                (dotimes (idummy number)
-                  (let ((sexp-found (diary-list-sexp-entries date))
-                        (entry-found (diary-list-entries-2
-                                      date diary-nonmarking-symbol
-                                      file-glob-attrs list-only)))
-                    (if diary-list-include-blanks
-                        (or sexp-found entry-found
-                            (diary-add-to-list date "" "" "" "")))
-                    (setq date
-                          (calendar-gregorian-from-absolute
-                           (1+ (calendar-absolute-from-gregorian date)))))))
-              (goto-char (point-min))
-              (run-hooks 'diary-nongregorian-listing-hook
-                         'diary-list-entries-hook)
-              (unless list-only
-                (if (and diary-display-function
-                         (listp diary-display-function))
-                    ;; Backwards compatibility.
-                    (run-hooks 'diary-display-function)
-                  (funcall (or diary-display-function
-                               'diary-simple-display))))
-              (run-hooks 'diary-hook)
-              (or d-incp (message "Preparing diary...done"))
-              diary-entries-list)))))))
+      (unwind-protect
+          (with-current-buffer (or diary-buffer
+                                   (if list-only
+                                       (setq temp-buff (generate-new-buffer
+                                                        " *diary-temp*"))
+                                     (find-file-noselect diary-file t)))
+            (if diary-buffer
+                (or (verify-visited-file-modtime diary-buffer)
+                    (revert-buffer t t)))
+            (if temp-buff
+                ;; If including, caller has already verified it is readable.
+                (insert-file-contents diary-file)
+              ;; Setup things like the header-line-format and invisibility-spec.
+              (if (eq major-mode (default-value 'major-mode))
+                  (diary-mode)
+                ;; This kludge is to make customizations to
+                ;; diary-header-line-flag after diary has been displayed
+                ;; take effect. Unconditionally calling (diary-mode)
+                ;; clobbers file local variables.
+                ;; http://lists.gnu.org/archive/html/emacs-pretest-bug/2007-03/msg00363.html
+                ;; http://lists.gnu.org/archive/html/emacs-pretest-bug/2007-04/msg00404.html
+                (if (eq major-mode 'diary-mode)
+                    (setq header-line-format (and diary-header-line-flag
+                                                  diary-header-line-format)))))
+            ;; d-s-p is passed to the diary display function.
+            (let ((diary-saved-point (point)))
+              (save-excursion
+                (save-restriction
+                  (widen)                   ; bug#5093
+                  (setq file-glob-attrs (cadr (diary-pull-attrs nil "")))
+                  (with-syntax-table diary-syntax-table
+                    (goto-char (point-min))
+                    (unless list-only
+                      (let ((ol (make-overlay (point-min) (point-max) nil t nil)))
+                        (set (make-local-variable 'diary-selective-display) t)
+                        (overlay-put ol 'invisible 'diary)
+                        (overlay-put ol 'evaporate t)))
+                    (dotimes (idummy number)
+                      (let ((sexp-found (diary-list-sexp-entries date))
+                            (entry-found (diary-list-entries-2
+                                          date diary-nonmarking-symbol
+                                          file-glob-attrs list-only)))
+                        (if diary-list-include-blanks
+                            (or sexp-found entry-found
+                                (diary-add-to-list date "" "" "" "")))
+                        (setq date
+                              (calendar-gregorian-from-absolute
+                               (1+ (calendar-absolute-from-gregorian date)))))))
+                  (goto-char (point-min))
+                  (run-hooks 'diary-nongregorian-listing-hook
+                             'diary-list-entries-hook)
+                  (unless list-only
+                    (if (and diary-display-function
+                             (listp diary-display-function))
+                        ;; Backwards compatibility.
+                        (run-hooks 'diary-display-function)
+                      (funcall (or diary-display-function
+                                   'diary-simple-display))))
+                  (run-hooks 'diary-hook)))))
+        (and temp-buff (buffer-name temp-buff) (kill-buffer temp-buff)))
+      (or d-incp (message "Preparing diary...done"))
+      diary-entries-list)))
 
 (define-obsolete-function-alias 'list-diary-entries 'diary-list-entries "22.1")