(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)
(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))))
(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'.
If you want to control what holidays are displayed, use a
different list. For example,
(list-holidays 2006 2006
(append general-holidays local-holidays other-holidays))
will display holidays for the year 2006 defined in the 3
mentioned lists, and nothing else.
When called interactively, this command offers a choice of
holidays, based on the variables `solar-holidays' etc. See the
documentation of `calendar-holidays' for a list of the variables
that control the choices, as well as a description of the format
of a holiday list.
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))))
(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."
(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 (+ (calendar-nth-named-absday 1 dayname m1 y1)
(* -7 n)
(if (> n 0) 1 -7)))
(d2 (+ (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 (if (or (= y1 y2) (> month 9))
y1
y2))
(d (or day (if (> n 0)
1
(calendar-last-day-of-month month y))))
(date (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."
(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)."
(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)
(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 (% (+ 14 (* 11 (% displayed-year 19)) (- (/ (* 3 century) 4))
(/ (+ 5 (* 8 century)) 25)
(* 30 century)) 30))
(adjusted-epact (if (or (zerop shifted-epact)
(and (= shifted-epact 1) (< 10 (% displayed-year 19))))
(1+ shifted-epact)
shifted-epact))
(paschal-moon (- (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 (% (+ 14
(* 11 (% julian-year 19)))
30))
(paschal-moon (- (calendar-absolute-from-julian (list 4 19 julian-year))
shifted-epact))
(nicaean-easter (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)