appt.el code simplifications.

* lisp/calendar/appt.el (appt-now-displayed): Remove pointless variable.
(appt-check): Simplify.

Details:
appt-now-displayed was set non-nil the first time a reminder was displayed.
Nothing ever set it back to nil again.  Thus when full-check was nil,
mode-line-only was always true, so the "(when (or full-check mode-line-only)"
was pointless.  That was the only use of full-check.  mode-line-only
was only used in a negative sense, and can be reduced to the zerop test.

2 files changed, 81 insertions, 89 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index d1348485002..beaee515a52 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,8 @@
+2011-05-12  Glenn Morris  <rgm@gnu.org>
+
+        * calendar/appt.el (appt-now-displayed): Remove pointless variable.
+        (appt-check): Simplify.
+
 2011-05-12  Eli Zaretskii  <eliz@gnu.org>
 
         * smerge-mode.el (smerge-resolve): Use null-device rather than a
diff --git a/lisp/calendar/appt.el b/lisp/calendar/appt.el
index d1483c5445d..dce6cc28239 100644
--- a/lisp/calendar/appt.el
+++ b/lisp/calendar/appt.el
@@ -197,9 +197,6 @@ Only used if `appt-display-mode-line' is non-nil.")
   "Time of day (mins since midnight) at which we last checked appointments.
 A nil value forces the diary file to be (re-)checked for appointments.")
 
-(defvar appt-now-displayed nil
-  "Non-nil when we have started notifying about a appointment that is near.")
-
 (defvar appt-display-count nil
   "Internal variable used to count number of consecutive reminders.")
 
@@ -285,93 +282,83 @@ displayed in a window:
   (let* ((min-to-app -1)
          (prev-appt-mode-string appt-mode-string)
          (prev-appt-display-count (or appt-display-count 0))
-         ;; Non-nil means do a full check for pending appointments and
-         ;; display in whatever ways the user has selected.  When no
-         ;; appointment is being displayed, we always do a full check.
-         (full-check
-          (or (not appt-now-displayed)
-              ;; This is true every appt-display-interval minutes.
-              (zerop (mod prev-appt-display-count appt-display-interval))))
-         ;; Non-nil means only update the interval displayed in the mode line.
-         (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                   ; 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)))
-        ;; At first check in any day, update appointments to today's list.
-        (if (or force                      ; eg initialize, diary save
-                (null appt-prev-comp-time) ; first check
-                (< cur-comp-time appt-prev-comp-time)) ; new day
-            (ignore-errors
-              (let ((diary-hook (if (assoc 'appt-make-list diary-hook)
-                                    diary-hook
-                                  (cons 'appt-make-list diary-hook))))
-                (if appt-display-diary
-                    (diary)
-                  ;; 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)))))
-        (setq appt-prev-comp-time cur-comp-time
-              appt-mode-string nil
-              appt-display-count nil)
-        ;; If there are entries in the list, and the user wants a
-        ;; message issued, get the first time off of the list and
-        ;; calculate the number of minutes until the appointment.
-        (when appt-time-msg-list
-          (setq appt-comp-time (caar (car appt-time-msg-list))
-                appt-warn-time (or (nth 3 (car appt-time-msg-list))
-                                   appt-message-warning-time)
-                min-to-app (- appt-comp-time cur-comp-time))
-          (while (and appt-time-msg-list
-                      (< appt-comp-time cur-comp-time))
-            (setq appt-time-msg-list (cdr appt-time-msg-list))
-            (if appt-time-msg-list
-                (setq appt-comp-time (caar (car appt-time-msg-list)))))
-          ;; If we have an appointment between midnight and
-          ;; `appt-warn-time' minutes after midnight, we
-          ;; must begin to issue a message before midnight.  Midnight
-          ;; is considered 0 minutes and 11:59pm is 1439
-          ;; minutes.  Therefore we must recalculate the minutes to
-          ;; appointment variable.  It is equal to the number of
-          ;; minutes before midnight plus the number of minutes after
-          ;; midnight our appointment is.
-          (if (and (< appt-comp-time appt-warn-time)
-                   (> (+ cur-comp-time appt-warn-time)
-                      appt-max-time))
-              (setq min-to-app (+ (- (1+ appt-max-time) cur-comp-time)
-                                  appt-comp-time)))
-          ;; Issue warning if the appointment time is within
-          ;; appt-message-warning time.
-          (when (and (<= min-to-app appt-warn-time)
-                     (>= min-to-app 0))
-            (setq appt-now-displayed t
-                  appt-display-count (1+ prev-appt-display-count))
-            (unless mode-line-only
-              (appt-display-message (cadr (car appt-time-msg-list))
-                                    min-to-app))
-            (when appt-display-mode-line
-              (setq appt-mode-string
-                    (concat " " (propertize
-                                 (format "App't in %s min." min-to-app)
-                                 'face 'mode-line-emphasis))))
-            ;; When an appointment is reached, delete it from the
-            ;; list.  Reset the count to 0 in case we display another
-            ;; appointment on the next cycle.
-            (if (zerop min-to-app)
-                (setq appt-time-msg-list (cdr appt-time-msg-list)
-                      appt-display-count nil))))
-        ;; If we have changed the mode line string, redisplay all mode lines.
-        (and appt-display-mode-line
-             (not (string-equal appt-mode-string
-                                prev-appt-mode-string))
-             (progn
-               (force-mode-line-update t)
-               ;; If the string now has a notification, redisplay right now.
-               (if appt-mode-string
-                   (sit-for 0))))))))
+    (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)))
+      ;; At first check in any day, update appointments to today's list.
+      (if (or force                      ; eg initialize, diary save
+              (null appt-prev-comp-time) ; first check
+              (< cur-comp-time appt-prev-comp-time)) ; new day
+          (ignore-errors
+            (let ((diary-hook (if (assoc 'appt-make-list diary-hook)
+                                  diary-hook
+                                (cons 'appt-make-list diary-hook))))
+              (if appt-display-diary
+                  (diary)
+                ;; 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)))))
+      (setq appt-prev-comp-time cur-comp-time
+            appt-mode-string nil
+            appt-display-count nil)
+      ;; If there are entries in the list, and the user wants a
+      ;; message issued, get the first time off of the list and
+      ;; calculate the number of minutes until the appointment.
+      (when appt-time-msg-list
+        (setq appt-comp-time (caar (car appt-time-msg-list))
+              appt-warn-time (or (nth 3 (car appt-time-msg-list))
+                                 appt-message-warning-time)
+              min-to-app (- appt-comp-time cur-comp-time))
+        (while (and appt-time-msg-list
+                    (< appt-comp-time cur-comp-time))
+          (setq appt-time-msg-list (cdr appt-time-msg-list))
+          (if appt-time-msg-list
+              (setq appt-comp-time (caar (car appt-time-msg-list)))))
+        ;; If we have an appointment between midnight and
+        ;; `appt-warn-time' minutes after midnight, we
+        ;; must begin to issue a message before midnight.  Midnight
+        ;; is considered 0 minutes and 11:59pm is 1439
+        ;; minutes.  Therefore we must recalculate the minutes to
+        ;; appointment variable.  It is equal to the number of
+        ;; minutes before midnight plus the number of minutes after
+        ;; midnight our appointment is.
+        (if (and (< appt-comp-time appt-warn-time)
+                 (> (+ cur-comp-time appt-warn-time)
+                    appt-max-time))
+            (setq min-to-app (+ (- (1+ appt-max-time) cur-comp-time)
+                                appt-comp-time)))
+        ;; Issue warning if the appointment time is within
+        ;; appt-message-warning time.
+        (when (and (<= min-to-app appt-warn-time)
+                   (>= min-to-app 0))
+          (setq appt-display-count (1+ prev-appt-display-count))
+          ;; This is true every appt-display-interval minutes.
+          (and (zerop (mod prev-appt-display-count appt-display-interval))
+               (appt-display-message (cadr (car appt-time-msg-list))
+                                     min-to-app))
+          (when appt-display-mode-line
+            (setq appt-mode-string
+                  (concat " " (propertize
+                               (format "App't in %s min." min-to-app)
+                               'face 'mode-line-emphasis))))
+          ;; When an appointment is reached, delete it from the
+          ;; list.  Reset the count to 0 in case we display another
+          ;; appointment on the next cycle.
+          (if (zerop min-to-app)
+              (setq appt-time-msg-list (cdr appt-time-msg-list)
+                    appt-display-count nil))))
+      ;; If we have changed the mode line string, redisplay all mode lines.
+      (and appt-display-mode-line
+           (not (string-equal appt-mode-string
+                              prev-appt-mode-string))
+           (progn
+             (force-mode-line-update t)
+             ;; If the string now has a notification, redisplay right now.
+             (if appt-mode-string
+                 (sit-for 0)))))))
 
 (defun appt-disp-window (min-to-app new-time appt-msg)
   "Display appointment due in MIN-TO-APP (a string) minutes.