mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-12-04 08:47:11 +00:00
524 lines
21 KiB
EmacsLisp
524 lines
21 KiB
EmacsLisp
;;; holidays.el --- holiday functions for the calendar package
|
|
|
|
;; Copyright (C) 1989, 1990, 1992, 1993, 1994, 1997, 2004 Free
|
|
;; Software Foundation, Inc.
|
|
|
|
;; Author: Edward M. Reingold <reingold@cs.uiuc.edu>
|
|
;; Maintainer: Glenn Morris <gmorris@ast.cam.ac.uk>
|
|
;; Keywords: holidays, calendar
|
|
|
|
;; This file is part of GNU Emacs.
|
|
|
|
;; GNU Emacs is free software; you can redistribute it and/or modify
|
|
;; it under the terms of the GNU General Public License as published by
|
|
;; the Free Software Foundation; either version 2, or (at your option)
|
|
;; any later version.
|
|
|
|
;; GNU Emacs is distributed in the hope that it will be useful,
|
|
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
;; GNU General Public License for more details.
|
|
|
|
;; You should have received a copy of the GNU General Public License
|
|
;; along with GNU Emacs; see the file COPYING. If not, write to the
|
|
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
;; Boston, MA 02111-1307, USA.
|
|
|
|
;;; Commentary:
|
|
|
|
;; This collection of functions implements the holiday features as described
|
|
;; in calendar.el.
|
|
|
|
;; Technical details of all the calendrical calculations can be found in
|
|
;; ``Calendrical Calculations'' by Nachum Dershowitz and Edward M. Reingold,
|
|
;; Cambridge University Press (1997).
|
|
|
|
;; An earlier version of the technical details appeared in
|
|
;; ``Calendrical Calculations'' by Nachum Dershowitz and Edward M. Reingold,
|
|
;; Software--Practice and Experience, Volume 20, Number 9 (September, 1990),
|
|
;; pages 899-928. ``Calendrical Calculations, Part II: Three Historical
|
|
;; Calendars'' by E. M. Reingold, N. Dershowitz, and S. M. Clamen,
|
|
;; Software--Practice and Experience, Volume 23, Number 4 (April, 1993),
|
|
;; pages 383-404.
|
|
|
|
;; Hard copies of these two papers can be obtained by sending email to
|
|
;; reingold@cs.uiuc.edu with the SUBJECT "send-paper-cal" (no quotes) and
|
|
;; the message BODY containing your mailing address (snail).
|
|
|
|
;; Comments, corrections, and improvements should be sent to
|
|
;; Edward M. Reingold Department of Computer Science
|
|
;; (217) 333-6733 University of Illinois at Urbana-Champaign
|
|
;; reingold@cs.uiuc.edu 1304 West Springfield Avenue
|
|
;; Urbana, Illinois 61801
|
|
|
|
;;; Code:
|
|
|
|
(defvar displayed-month)
|
|
(defvar displayed-year)
|
|
|
|
(require 'calendar)
|
|
|
|
(autoload 'holiday-julian "cal-julian"
|
|
"Holiday on MONTH, DAY (Julian) called STRING."
|
|
t)
|
|
|
|
(autoload 'holiday-hebrew "cal-hebrew"
|
|
"Holiday on MONTH, DAY (Hebrew) called STRING."
|
|
t)
|
|
|
|
(autoload 'holiday-rosh-hashanah-etc "cal-hebrew"
|
|
"List of dates related to Rosh Hashanah, as visible in calendar window."
|
|
t)
|
|
|
|
(autoload 'holiday-hanukkah "cal-hebrew"
|
|
"List of dates related to Hanukkah, as visible in calendar window."
|
|
t)
|
|
|
|
(autoload 'holiday-passover-etc "cal-hebrew"
|
|
"List of dates related to Passover, as visible in calendar window."
|
|
t)
|
|
|
|
(autoload 'holiday-tisha-b-av-etc "cal-hebrew"
|
|
"List of dates around Tisha B'Av, as visible in calendar window."
|
|
t)
|
|
|
|
(autoload 'holiday-islamic "cal-islam"
|
|
"Holiday on MONTH, DAY (Islamic) called STRING."
|
|
t)
|
|
|
|
(autoload 'holiday-bahai "cal-bahai"
|
|
"Holiday on MONTH, DAY (Baha'i) called STRING."
|
|
t)
|
|
|
|
(autoload 'holiday-chinese-new-year "cal-china"
|
|
"Date of Chinese New Year."
|
|
t)
|
|
|
|
(autoload 'solar-equinoxes-solstices "solar"
|
|
"Date and time of equinoxes and solstices, if visible in the calendar window.
|
|
Requires floating point."
|
|
t)
|
|
|
|
;;;###autoload
|
|
(defun holidays (&optional arg)
|
|
"Display the holidays for last month, this month, and next month.
|
|
If called with an optional prefix argument, prompts for month and year.
|
|
|
|
This function is suitable for execution in a .emacs file."
|
|
(interactive "P")
|
|
(save-excursion
|
|
(let* ((completion-ignore-case t)
|
|
(date (if arg
|
|
(calendar-read-date t)
|
|
(calendar-current-date)))
|
|
(displayed-month (extract-calendar-month date))
|
|
(displayed-year (extract-calendar-year date)))
|
|
(list-calendar-holidays))))
|
|
|
|
;;;###autoload
|
|
(defun list-holidays (y1 y2 &optional l label)
|
|
"Display holidays for years Y1 to Y2 (inclusive).
|
|
|
|
The optional list of holidays L defaults to `calendar-holidays'. See the
|
|
documentation for that variable for a description of holiday lists.
|
|
|
|
The optional LABEL is used to label the buffer created."
|
|
(interactive
|
|
(let* ((start-year (calendar-read
|
|
"Starting year of holidays (>0): "
|
|
'(lambda (x) (> x 0))
|
|
(int-to-string (extract-calendar-year
|
|
(calendar-current-date)))))
|
|
(end-year (calendar-read
|
|
(format "Ending year (inclusive) of holidays (>=%s): "
|
|
start-year)
|
|
'(lambda (x) (>= x start-year))
|
|
(int-to-string start-year)))
|
|
(completion-ignore-case t)
|
|
(lists
|
|
(list
|
|
(cons "All" calendar-holidays)
|
|
(if (fboundp 'atan)
|
|
(cons "Equinoxes/Solstices"
|
|
(list (list 'solar-equinoxes-solstices))))
|
|
(if general-holidays (cons "General" general-holidays))
|
|
(if local-holidays (cons "Local" local-holidays))
|
|
(if other-holidays (cons "Other" other-holidays))
|
|
(if christian-holidays (cons "Christian" christian-holidays))
|
|
(if hebrew-holidays (cons "Hebrew" hebrew-holidays))
|
|
(if islamic-holidays (cons "Islamic" islamic-holidays))
|
|
(if bahai-holidays (cons "Baha'i" bahai-holidays))
|
|
(if oriental-holidays (cons "Oriental" oriental-holidays))
|
|
(if solar-holidays (cons "Solar" solar-holidays))
|
|
(cons "Ask" nil)))
|
|
(choice (capitalize
|
|
(completing-read "List (TAB for choices): " lists nil t)))
|
|
(which (if (string-equal choice "Ask")
|
|
(eval (read-variable "Enter list name: "))
|
|
(cdr (assoc choice lists))))
|
|
(name (if (string-equal choice "Equinoxes/Solstices")
|
|
choice
|
|
(if (member choice '("Ask" ""))
|
|
"Holidays"
|
|
(format "%s Holidays" choice)))))
|
|
(list start-year end-year which name)))
|
|
(message "Computing holidays...")
|
|
(let* ((holiday-buffer "*Holidays*")
|
|
(calendar-holidays (if l l calendar-holidays))
|
|
(title (or label "Holidays"))
|
|
(holiday-list nil)
|
|
(s (calendar-absolute-from-gregorian (list 2 1 y1)))
|
|
(e (calendar-absolute-from-gregorian (list 11 1 y2)))
|
|
(d s)
|
|
(never t)
|
|
(displayed-month 2)
|
|
(displayed-year y1))
|
|
(while (or never (<= d e))
|
|
(setq holiday-list (append holiday-list (calendar-holiday-list)))
|
|
(setq never nil)
|
|
(increment-calendar-month displayed-month displayed-year 3)
|
|
(setq d (calendar-absolute-from-gregorian
|
|
(list displayed-month 1 displayed-year))))
|
|
(save-excursion
|
|
(set-buffer (get-buffer-create holiday-buffer))
|
|
(setq buffer-read-only nil)
|
|
(calendar-set-mode-line
|
|
(if (= y1 y2)
|
|
(format "%s for %s" title y1)
|
|
(format "%s for %s-%s" title y1 y2)))
|
|
(erase-buffer)
|
|
(goto-char (point-min))
|
|
(insert
|
|
(mapconcat
|
|
'(lambda (x) (concat (calendar-date-string (car x))
|
|
": " (car (cdr x))))
|
|
holiday-list "\n"))
|
|
(goto-char (point-min))
|
|
(set-buffer-modified-p nil)
|
|
(setq buffer-read-only t)
|
|
(display-buffer holiday-buffer)
|
|
(message "Computing holidays...done"))))
|
|
|
|
|
|
(defun check-calendar-holidays (date)
|
|
"Check the list of holidays for any that occur on DATE.
|
|
The value returned is a list of strings of relevant holiday descriptions.
|
|
The holidays are those in the list calendar-holidays."
|
|
(let* ((displayed-month (extract-calendar-month date))
|
|
(displayed-year (extract-calendar-year date))
|
|
(h (calendar-holiday-list))
|
|
(holiday-list))
|
|
(while h
|
|
(if (calendar-date-equal date (car (car h)))
|
|
(setq holiday-list (append holiday-list (cdr (car h)))))
|
|
(setq h (cdr h)))
|
|
holiday-list))
|
|
|
|
(defun calendar-cursor-holidays ()
|
|
"Find holidays for the date specified by the cursor in the calendar window."
|
|
(interactive)
|
|
(message "Checking holidays...")
|
|
(let* ((date (calendar-cursor-to-date t))
|
|
(date-string (calendar-date-string date))
|
|
(holiday-list (check-calendar-holidays date))
|
|
(holiday-string (mapconcat 'identity holiday-list "; "))
|
|
(msg (format "%s: %s" date-string holiday-string)))
|
|
(if (not holiday-list)
|
|
(message "No holidays known for %s" date-string)
|
|
(if (<= (length msg) (frame-width))
|
|
(message "%s" msg)
|
|
(set-buffer (get-buffer-create holiday-buffer))
|
|
(setq buffer-read-only nil)
|
|
(calendar-set-mode-line date-string)
|
|
(erase-buffer)
|
|
(insert (mapconcat 'identity holiday-list "\n"))
|
|
(goto-char (point-min))
|
|
(set-buffer-modified-p nil)
|
|
(setq buffer-read-only t)
|
|
(display-buffer holiday-buffer)
|
|
(message "Checking holidays...done")))))
|
|
|
|
(defun mark-calendar-holidays ()
|
|
"Mark notable days in the calendar window."
|
|
(interactive)
|
|
(setq mark-holidays-in-calendar t)
|
|
(message "Marking holidays...")
|
|
(let ((holiday-list (calendar-holiday-list)))
|
|
(while holiday-list
|
|
(mark-visible-calendar-date
|
|
(car (car holiday-list)) calendar-holiday-marker)
|
|
(setq holiday-list (cdr holiday-list))))
|
|
(message "Marking holidays...done"))
|
|
|
|
(defun list-calendar-holidays ()
|
|
"Create a buffer containing the holidays for the current calendar window.
|
|
The holidays are those in the list calendar-notable-days. Returns t if any
|
|
holidays are found, nil if not."
|
|
(interactive)
|
|
(message "Looking up holidays...")
|
|
(let ((holiday-list (calendar-holiday-list))
|
|
(m1 displayed-month)
|
|
(y1 displayed-year)
|
|
(m2 displayed-month)
|
|
(y2 displayed-year))
|
|
(if (not holiday-list)
|
|
(progn
|
|
(message "Looking up holidays...none found")
|
|
nil)
|
|
(set-buffer (get-buffer-create holiday-buffer))
|
|
(setq buffer-read-only nil)
|
|
(increment-calendar-month m1 y1 -1)
|
|
(increment-calendar-month m2 y2 1)
|
|
(calendar-set-mode-line
|
|
(if (= y1 y2)
|
|
(format "Notable Dates from %s to %s, %d%%-"
|
|
(calendar-month-name m1) (calendar-month-name m2) y2)
|
|
(format "Notable Dates from %s, %d to %s, %d%%-"
|
|
(calendar-month-name m1) y1 (calendar-month-name m2) y2)))
|
|
(erase-buffer)
|
|
(insert
|
|
(mapconcat
|
|
'(lambda (x) (concat (calendar-date-string (car x))
|
|
": " (car (cdr x))))
|
|
holiday-list "\n"))
|
|
(goto-char (point-min))
|
|
(set-buffer-modified-p nil)
|
|
(setq buffer-read-only t)
|
|
(display-buffer holiday-buffer)
|
|
(message "Looking up holidays...done")
|
|
t)))
|
|
|
|
(defun calendar-holiday-list ()
|
|
"Form the list of holidays that occur on dates in the calendar window.
|
|
The holidays are those in the list calendar-holidays."
|
|
(let ((p calendar-holidays)
|
|
(holiday-list))
|
|
(while p
|
|
(let* ((holidays
|
|
(if calendar-debug-sexp
|
|
(let ((stack-trace-on-error t))
|
|
(eval (car p)))
|
|
(condition-case nil
|
|
(eval (car p))
|
|
(error (beep)
|
|
(message "Bad holiday list item: %s" (car p))
|
|
(sleep-for 2))))))
|
|
(if holidays
|
|
(setq holiday-list (append holidays holiday-list))))
|
|
(setq p (cdr p)))
|
|
(setq holiday-list (sort holiday-list 'calendar-date-compare))))
|
|
|
|
;; Below are the functions that calculate the dates of holidays; these
|
|
;; are eval'ed in the function calendar-holiday-list. If you
|
|
;; write other such functions, be sure to imitate the style used below.
|
|
;; Remember that each function must return a list of items of the form
|
|
;; ((month day year) string) of VISIBLE dates in the calendar window.
|
|
|
|
(defun holiday-fixed (month day string)
|
|
"Holiday on MONTH, DAY (Gregorian) called STRING.
|
|
If MONTH, DAY is visible, the value returned is the list (((MONTH DAY year)
|
|
STRING)). Returns nil if it is not visible in the current calendar window."
|
|
(let ((m displayed-month)
|
|
(y displayed-year))
|
|
(increment-calendar-month m y (- 11 month))
|
|
(if (> m 9)
|
|
(list (list (list month day y) string)))))
|
|
|
|
(defun holiday-float (month dayname n string &optional day)
|
|
"Holiday on MONTH, DAYNAME (Nth occurrence) called STRING.
|
|
If the Nth DAYNAME in MONTH is visible, the value returned is the list
|
|
\(((MONTH DAY year) STRING)).
|
|
|
|
If N<0, count backward from the end of MONTH.
|
|
|
|
An optional parameter DAY means the Nth DAYNAME on or after/before MONTH DAY.
|
|
|
|
Returns nil if it is not visible in the current calendar window."
|
|
;; This is messy because the holiday may be visible, while the date on which
|
|
;; it is based is not. For example, the first Monday after December 30 may be
|
|
;; visible when January is not. For large values of |n| the problem is more
|
|
;; grotesque. If we didn't have to worry about such cases, we could just use
|
|
|
|
;; (let ((m displayed-month)
|
|
;; (y displayed-year))
|
|
;; (increment-calendar-month m y (- 11 month))
|
|
;; (if (> m 9); month in year y is visible
|
|
;; (list (list (calendar-nth-named-day n dayname month y day) string)))))
|
|
|
|
;; which is the way the function was originally written.
|
|
|
|
(let* ((m1 displayed-month)
|
|
(y1 displayed-year)
|
|
(m2 m1)
|
|
(y2 y1))
|
|
(increment-calendar-month m1 y1 -1)
|
|
(increment-calendar-month m2 y2 1)
|
|
(let* ((d1; first possible base date for holiday
|
|
(+ (calendar-nth-named-absday 1 dayname m1 y1)
|
|
(* -7 n)
|
|
(if (> n 0) 1 -7)))
|
|
(d2; last possible base date for holiday
|
|
(+ (calendar-nth-named-absday -1 dayname m2 y2)
|
|
(* -7 n)
|
|
(if (> n 0) 7 -1)))
|
|
(y1 (extract-calendar-year (calendar-gregorian-from-absolute d1)))
|
|
(y2 (extract-calendar-year (calendar-gregorian-from-absolute d2)))
|
|
(y; year of base date
|
|
(if (or (= y1 y2) (> month 9))
|
|
y1
|
|
y2))
|
|
(d; day of base date
|
|
(or day (if (> n 0)
|
|
1
|
|
(calendar-last-day-of-month month y))))
|
|
(date; base date for holiday
|
|
(calendar-absolute-from-gregorian (list month d y))))
|
|
(if (and (<= d1 date) (<= date d2))
|
|
(list (list (calendar-nth-named-day n dayname month y d)
|
|
string))))))
|
|
|
|
(defun holiday-sexp (sexp string)
|
|
"Sexp holiday for dates in the calendar window.
|
|
SEXP is an expression in variable `year' evaluates to `date'.
|
|
|
|
STRING is an expression in `date' that evaluates to the holiday description
|
|
of `date'.
|
|
|
|
If `date' is visible in the calendar window, the holiday STRING is on that
|
|
date. If date is nil, or if the date is not visible, there is no holiday."
|
|
(let ((m displayed-month)
|
|
(y displayed-year))
|
|
(increment-calendar-month m y -1)
|
|
(filter-visible-calendar-holidays
|
|
(append
|
|
(let* ((year y)
|
|
(date (eval sexp))
|
|
(string (if date (eval string))))
|
|
(list (list date string)))
|
|
(let* ((year (1+ y))
|
|
(date (eval sexp))
|
|
(string (if date (eval string))))
|
|
(list (list date string)))))))
|
|
|
|
(defun holiday-advent (&optional n string)
|
|
"Date of Nth day after advent (named STRING), if visible in calendar window.
|
|
Negative values of N are interpreted as days before advent.
|
|
STRING is used purely for display purposes. The return value has
|
|
the form ((MONTH DAY YEAR) STRING), where the date is that of the
|
|
Nth day before or after advent.
|
|
|
|
For backwards compatibility, if this function is called with no
|
|
arguments, then it returns the value appropriate for advent itself."
|
|
;; Backwards compatibility layer.
|
|
(if (not n)
|
|
(holiday-advent 0 "Advent")
|
|
(let ((year displayed-year)
|
|
(month displayed-month))
|
|
(increment-calendar-month month year -1)
|
|
(let ((advent (calendar-gregorian-from-absolute
|
|
(+ n
|
|
(calendar-dayname-on-or-before
|
|
0
|
|
(calendar-absolute-from-gregorian
|
|
(list 12 3 year)))))))
|
|
(if (calendar-date-is-visible-p advent)
|
|
(list (list advent string)))))))
|
|
|
|
(defun holiday-easter-etc (&optional n string)
|
|
"Date of Nth day after Easter (named STRING), if visible in calendar window.
|
|
Negative values of N are interpreted as days before Easter.
|
|
STRING is used purely for display purposes. The return value has
|
|
the form ((MONTH DAY YEAR) STRING), where the date is that of the
|
|
Nth day before or after Easter.
|
|
|
|
For backwards compatibility, if this function is called with no
|
|
arguments, then it returns a list of \"standard\" Easter-related
|
|
holidays (with more entries if `all-christian-calendar-holidays'
|
|
is non-nil)."
|
|
;; Backwards compatibility layer.
|
|
(if (not n)
|
|
(let (res-list res)
|
|
(dolist (elem (append
|
|
(if all-christian-calendar-holidays
|
|
'((-63 . "Septuagesima Sunday")
|
|
(-56 . "Sexagesima Sunday")
|
|
(-49 . "Shrove Sunday")
|
|
(-48 . "Shrove Monday")
|
|
(-47 . "Shrove Tuesday")
|
|
(-14 . "Passion Sunday")
|
|
(-7 . "Palm Sunday")
|
|
(-3 . "Maundy Thursday")
|
|
(35 . "Rogation Sunday")
|
|
(39 . "Ascension Day")
|
|
(49 . "Pentecost (Whitsunday)")
|
|
(50 . "Whitmonday")
|
|
(56 . "Trinity Sunday")
|
|
(60 . "Corpus Christi")))
|
|
'((0 . "Easter Sunday")
|
|
(-2 . "Good Friday")
|
|
(-46 . "Ash Wednesday")))
|
|
res-list)
|
|
;; Filter out nil (not visible) values.
|
|
(if (setq res (holiday-easter-etc (car elem) (cdr elem)))
|
|
(setq res-list (append res res-list)))))
|
|
(let* ((century (1+ (/ displayed-year 100)))
|
|
(shifted-epact ;; Age of moon for April 5...
|
|
(% (+ 14 (* 11 (% displayed-year 19)) ;; ...by Nicaean rule
|
|
(- ;; ...corrected for the Gregorian century rule
|
|
(/ (* 3 century) 4))
|
|
(/ ;; ...corrected for Metonic cycle inaccuracy.
|
|
(+ 5 (* 8 century)) 25)
|
|
(* 30 century)) ;; Keeps value positive.
|
|
30))
|
|
(adjusted-epact ;; Adjust for 29.5 day month.
|
|
(if (or (zerop shifted-epact)
|
|
(and (= shifted-epact 1) (< 10 (% displayed-year 19))))
|
|
(1+ shifted-epact)
|
|
shifted-epact))
|
|
(paschal-moon ;; Day after the full moon on or after March 21.
|
|
(- (calendar-absolute-from-gregorian (list 4 19 displayed-year))
|
|
adjusted-epact))
|
|
(abs-easter (calendar-dayname-on-or-before 0 (+ paschal-moon 7))))
|
|
(filter-visible-calendar-holidays
|
|
(list (list (calendar-gregorian-from-absolute (+ abs-easter n))
|
|
string))))))
|
|
|
|
(defun holiday-greek-orthodox-easter ()
|
|
"Date of Easter according to the rule of the Council of Nicaea."
|
|
(let ((m displayed-month)
|
|
(y displayed-year))
|
|
(increment-calendar-month m y 1)
|
|
(let* ((julian-year
|
|
(extract-calendar-year
|
|
(calendar-julian-from-absolute
|
|
(calendar-absolute-from-gregorian
|
|
(list m (calendar-last-day-of-month m y) y)))))
|
|
(shifted-epact ;; Age of moon for April 5.
|
|
(% (+ 14
|
|
(* 11 (% julian-year 19)))
|
|
30))
|
|
(paschal-moon ;; Day after full moon on or after March 21.
|
|
(- (calendar-absolute-from-julian (list 4 19 julian-year))
|
|
shifted-epact))
|
|
(nicaean-easter;; Sunday following the Paschal moon
|
|
(calendar-gregorian-from-absolute
|
|
(calendar-dayname-on-or-before 0 (+ paschal-moon 7)))))
|
|
(if (calendar-date-is-visible-p nicaean-easter)
|
|
(list (list nicaean-easter "Pascha (Greek Orthodox Easter)"))))))
|
|
|
|
(defun filter-visible-calendar-holidays (l)
|
|
"Return a list of all visible holidays of those on L."
|
|
(let ((visible)
|
|
(p l))
|
|
(while p
|
|
(and (car (car p))
|
|
(calendar-date-is-visible-p (car (car p)))
|
|
(setq visible (append (list (car p)) visible)))
|
|
(setq p (cdr p)))
|
|
visible))
|
|
|
|
(provide 'holidays)
|
|
|
|
;;; arch-tag: 48eb3117-75a7-4dbe-8fd9-873c3cbb0d37
|
|
;;; holidays.el ends here
|