From b5305eb0516c217caba18b37ff8c993acaa7cfc0 Mon Sep 17 00:00:00 2001
From: "Edward M. Reingold" <reingold@emr.cs.iit.edu>
Date: Mon, 11 May 1998 14:56:37 +0000
Subject: [PATCH] Made holiday button on menu bar related to current calendar
 display.

---
 lisp/calendar/cal-menu.el | 61 +++++++++++++++++++++++++++++----------
 lisp/calendar/calendar.el |  2 ++
 2 files changed, 48 insertions(+), 15 deletions(-)

diff --git a/lisp/calendar/cal-menu.el b/lisp/calendar/cal-menu.el
index 2e29be0958a..e6c58109eda 100644
--- a/lisp/calendar/cal-menu.el
+++ b/lisp/calendar/cal-menu.el
@@ -38,6 +38,7 @@
 ;;; Code:
 
 (eval-when-compile (require 'calendar))
+(require 'easymenu)
 
 (define-key calendar-mode-map [menu-bar edit] 'undefined)
 (define-key calendar-mode-map [menu-bar search] 'undefined)
@@ -88,21 +89,6 @@
 (define-key calendar-mode-map [menu-bar holidays]
   (cons "Holidays" (make-sparse-keymap "Holidays")))
 
-(define-key calendar-mode-map [menu-bar holidays unmark]
-  '("Unmark" . calendar-unmark))
-(define-key calendar-mode-map [menu-bar holidays mark]
-  '("Mark" . mark-calendar-holidays))
-(define-key calendar-mode-map [menu-bar holidays previous-year]
-  '("Previous year" . cal-menu-list-holidays-previous-year))
-(define-key calendar-mode-map [menu-bar holidays following-year]
-  '("Following year" . cal-menu-list-holidays-following-year))
-(define-key calendar-mode-map [menu-bar holidays year]
-  '("Year" . cal-menu-list-holidays-year))
-(define-key calendar-mode-map [menu-bar holidays 3-mon]
-  '("3 Months" . list-calendar-holidays))
-(define-key calendar-mode-map [menu-bar holidays 1-day]
-  '("One Day" . calendar-cursor-holidays))
-
 (define-key calendar-mode-map [menu-bar goto]
   (cons "Goto" (make-sparse-keymap "Goto")))
 
@@ -193,6 +179,51 @@
   (let ((year (1- (extract-calendar-year (calendar-cursor-to-date)))))
     (list-holidays year year)))
 
+(defun cal-menu-update ()
+  ;; Update the holiday part of calendar menu bar for the current display.
+  (condition-case nil
+      (if (eq major-mode 'calendar-mode)
+          (let ((l))
+            (calendar-for-loop;; Show 11 years--5 before, 5 after year of
+                   ;; middle month
+             i from (- displayed-year 5) to (+ displayed-year 5) do
+             (setq l (cons (vector (format "For Year %s" i)
+                                   (list (list 'lambda 'nil '(interactive)
+                                               (list 'list-holidays i i)))
+                                   t)
+                           l)))
+            (setq l (cons ["Mark Holidays" mark-calendar-holidays t]
+                          (cons ["Unmark Calendar" calendar-unmark t] l)))
+            (easy-menu-change nil "holidays" (nreverse l))
+            (let ((title
+                   (let ((m1 displayed-month)
+                         (y1 displayed-year)
+                         (m2 displayed-month)
+                         (y2 displayed-year))
+                     (increment-calendar-month m1 y1 -1)
+                     (increment-calendar-month m2 y2 1)
+                     (if (= y1 y2)
+                         (format "%s-%s, %d"
+                                 (calendar-month-name m1 3)
+                                 (calendar-month-name m2 3)
+                                 y2)
+                       (format "%s, %d-%s, %d"
+                               (calendar-month-name m1 3)
+                               y1
+                               (calendar-month-name m2 3)
+                               y2)))))
+              (define-key  calendar-mode-map [menu-bar holidays 3-day]
+                `(,(format "For Current Window (%s)" title)
+                  . list-calendar-holidays)))
+            (let ((date (calendar-cursor-to-date)))
+              (if date
+                  (define-key calendar-mode-map [menu-bar holidays 1-day]
+                    `(,(format "For Cursor Date (%s)"
+                               (calendar-date-string date t t))
+                      . calendar-cursor-holidays))))))
+    ;; Try to avoid entering infinite beep mode in case of errors.
+    (error (ding))))
+
 (defun calendar-event-to-date (&optional error)
   "Date of last event.
 If event is not on a specific date, signals an error if optional parameter
diff --git a/lisp/calendar/calendar.el b/lisp/calendar/calendar.el
index 821748ad4e3..65e2ace68fc 100644
--- a/lisp/calendar/calendar.el
+++ b/lisp/calendar/calendar.el
@@ -2025,6 +2025,8 @@ For a complete description, type \
   (setq buffer-read-only t)
   (setq indent-tabs-mode nil)
   (update-calendar-mode-line)
+  (make-local-hook 'activate-menubar-hook)
+  (add-hook 'activate-menubar-hook 'cal-menu-update nil t)
   (make-local-variable 'calendar-mark-ring)
   (make-local-variable 'displayed-month);;  Month in middle of window.
   (make-local-variable 'displayed-year));;  Year in middle of window.
-- 
2.39.2