+++ /dev/null
-;;; cal-bahai.el --- calendar functions for the Baha'i calendar.
-
-;; Copyright (C) 2001 Free Software Foundation, Inc.
-
-;; Author: John Wiegley <johnw@gnu.org>
-;; Keywords: calendar
-;; Human-Keywords: Baha'i calendar, Baha'i, Bahai, calendar, diary
-
-;; 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 features of calendar.el
-;; and diary.el that deal with the Baha'i calendar.
-
-;; The Baha'i (http://www.bahai.org) calendar system is based on a
-;; solar cycle of 19 months with 19 days each. The four remaining
-;; "intercalary" days are called the Ayyam-i-Ha (days of Ha), and are
-;; placed between the 18th and 19th months. They are meant as a time
-;; of festivals preceding the 19th month, which is the month of
-;; fasting. In Gregorian leap years, there are 5 of these days (Ha
-;; has the numerical value of 5 in the arabic abjad, or
-;; letter-to-number, reckoning).
-
-;; Each month is named after an attribute of God, as are the 19 days
-;; -- which have the same names as the months. There is also a name
-;; for each year in every 19 year cycle. These cycles are called
-;; Vahids. A cycle of 19 Vahids (361 years) is called a Kullu-Shay,
-;; which means "all things".
-
-;; The calendar was named the "Badi calendar" by its author, the Bab.
-;; It uses a week of seven days, corresponding to the Gregorian week,
-;; each of which has its own name, again patterned after the
-;; attributes of God.
-
-;; Note: The days of Ayyam-i-Ha are encoded as zero and negative
-;; offsets from the first day of the final month. So, (19 -3 157) is
-;; the first day of Ayyam-i-Ha, in the year 157 BE.
-
-;;; Code:
-
-(require 'cal-julian)
-
-(defvar bahai-calendar-month-name-array
- ["Baha" "Jalal" "Jamal" "`Azamat" "Nur" "Rahmat" "Kalimat" "Kamal"
- "Asma" "`Izzat" "Mashiyyat" "`Ilm" "Qudrat" "Qawl" "Masa'il"
- "Sharaf" "Sultan" "Mulk" "`Ala"])
-
-(defvar calendar-bahai-epoch (calendar-absolute-from-gregorian '(3 21 1843))
- "Absolute date of start of Baha'i calendar = March 19, 622 A.D. (Julian).")
-
-(defun bahai-calendar-leap-year-p (year)
- "True if YEAR is a leap year on the Baha'i calendar."
- (calendar-leap-year-p (+ year 1843)))
-
-(defvar bahai-calendar-leap-base
- (+ (/ 1843 4) (- (/ 1843 100)) (/ 1843 400)))
-
-(defun calendar-absolute-from-bahai (date)
- "Compute absolute date from Baha'i date DATE.
-The absolute date is the number of days elapsed since the (imaginary)
-Gregorian date Sunday, December 31, 1 BC."
- (let* ((month (extract-calendar-month date))
- (day (extract-calendar-day date))
- (year (extract-calendar-year date))
- (prior-years (+ (1- year) 1843))
- (leap-days (- (+ (/ prior-years 4) ; Leap days in prior years.
- (- (/ prior-years 100))
- (/ prior-years 400))
- bahai-calendar-leap-base)))
- (+ (1- calendar-bahai-epoch) ; Days before epoch
- (* 365 (1- year)) ; Days in prior years.
- leap-days
- (calendar-sum m 1 (< m month) 19)
- (if (= month 19) 4 0)
- day))) ; Days so far this month.
-
-(defun calendar-bahai-from-absolute (date)
- "Baha'i year corresponding to the absolute DATE."
- (if (< date calendar-bahai-epoch)
- (list 0 0 0) ;; pre-Baha'i date
- (let* ((greg (calendar-gregorian-from-absolute date))
- (year (+ (- (extract-calendar-year greg) 1843)
- (if (or (> (extract-calendar-month greg) 3)
- (and (= (extract-calendar-month greg) 3)
- (>= (extract-calendar-day greg) 21)))
- 1 0)))
- (month ;; Search forward from Baha.
- (1+ (calendar-sum m 1
- (> date
- (calendar-absolute-from-bahai
- (list m 19 year)))
- 1)))
- (day ;; Calculate the day by subtraction.
- (- date
- (1- (calendar-absolute-from-bahai (list month 1 year))))))
- (list month day year))))
-
-(defun calendar-bahai-date-string (&optional date)
- "String of Baha'i date of Gregorian DATE.
-Defaults to today's date if DATE is not given."
- (let* ((bahai-date (calendar-bahai-from-absolute
- (calendar-absolute-from-gregorian
- (or date (calendar-current-date)))))
- (y (extract-calendar-year bahai-date))
- (m (extract-calendar-month bahai-date))
- (d (extract-calendar-day bahai-date)))
- (let ((monthname
- (if (and (= m 19)
- (<= d 0))
- "Ayyam-i-Ha"
- (aref bahai-calendar-month-name-array (1- m))))
- (day (int-to-string
- (if (<= d 0)
- (if (bahai-calendar-leap-year-p y)
- (+ d 5)
- (+ d 4))
- d)))
- (dayname nil)
- (month (int-to-string m))
- (year (int-to-string y)))
- (mapconcat 'eval calendar-date-display-form ""))))
-
-(defun calendar-print-bahai-date ()
- "Show the Baha'i calendar equivalent of the selected date."
- (interactive)
- (message "Baha'i date: %s"
- (calendar-bahai-date-string (calendar-cursor-to-date t))))
-
-(defun calendar-goto-bahai-date (date &optional noecho)
- "Move cursor to Baha'i date DATE.
-Echo Baha'i date unless NOECHO is t."
- (interactive (bahai-prompt-for-date))
- (calendar-goto-date (calendar-gregorian-from-absolute
- (calendar-absolute-from-bahai date)))
- (or noecho (calendar-print-bahai-date)))
-
-(defun bahai-prompt-for-date ()
- "Ask for a Baha'i date."
- (let* ((today (calendar-current-date))
- (year (calendar-read
- "Baha'i calendar year (not 0): "
- '(lambda (x) (/= x 0))
- (int-to-string
- (extract-calendar-year
- (calendar-bahai-from-absolute
- (calendar-absolute-from-gregorian today))))))
- (completion-ignore-case t)
- (month (cdr (assoc
- (completing-read
- "Baha'i calendar month name: "
- (mapcar 'list
- (append bahai-calendar-month-name-array nil))
- nil t)
- (calendar-make-alist bahai-calendar-month-name-array
- 1))))
- (day (calendar-read "Baha'i calendar day (1-19): "
- '(lambda (x) (and (< 0 x) (<= x 19))))))
- (list (list month day year))))
-
-(defun diary-bahai-date ()
- "Baha'i calendar equivalent of date diary entry."
- (format "Baha'i date: %s" (calendar-bahai-date-string date)))
-
-(defun holiday-bahai (month day string)
- "Holiday on MONTH, DAY (Baha'i) called STRING.
-If MONTH, DAY (Baha'i) is visible, the value returned is corresponding
-Gregorian date in the form of the list (((month day year) STRING)). Returns
-nil if it is not visible in the current calendar window."
- (let* ((bahai-date (calendar-bahai-from-absolute
- (calendar-absolute-from-gregorian
- (list displayed-month 15 displayed-year))))
- (m (extract-calendar-month bahai-date))
- (y (extract-calendar-year bahai-date))
- (date))
- (if (< m 1)
- nil ;; Baha'i calendar doesn't apply.
- (increment-calendar-month m y (- 10 month))
- (if (> m 7) ;; Baha'i date might be visible
- (let ((date (calendar-gregorian-from-absolute
- (calendar-absolute-from-bahai (list month day y)))))
- (if (calendar-date-is-visible-p date)
- (list (list date string))))))))
-
-(defun list-bahai-diary-entries ()
- "Add any Baha'i date entries from the diary file to `diary-entries-list'.
-Baha'i date diary entries must be prefaced by an
-`bahai-diary-entry-symbol' (normally a `B'). The same diary date
-forms govern the style of the Baha'i calendar entries, except that the
-Baha'i month names must be given numerically. The Baha'i months are
-numbered from 1 to 19 with Baha being 1 and 19 being `Ala. If a
-Baha'i date diary entry begins with a `diary-nonmarking-symbol', the
-entry will appear in the diary listing, but will not be marked in the
-calendar. This function is provided for use with the
-`nongregorian-diary-listing-hook'."
- (if (< 0 number)
- (let ((buffer-read-only nil)
- (diary-modified (buffer-modified-p))
- (gdate original-date)
- (mark (regexp-quote diary-nonmarking-symbol)))
- (calendar-for-loop i from 1 to number do
- (let* ((d diary-date-forms)
- (bdate (calendar-bahai-from-absolute
- (calendar-absolute-from-gregorian gdate)))
- (month (extract-calendar-month bdate))
- (day (extract-calendar-day bdate))
- (year (extract-calendar-year bdate)))
- (while d
- (let*
- ((date-form (if (equal (car (car d)) 'backup)
- (cdr (car d))
- (car d)))
- (backup (equal (car (car d)) 'backup))
- (dayname
- (concat
- (calendar-day-name gdate) "\\|"
- (substring (calendar-day-name gdate) 0 3) ".?"))
- (calendar-month-name-array
- bahai-calendar-month-name-array)
- (monthname
- (concat
- "\\*\\|"
- (calendar-month-name month)))
- (month (concat "\\*\\|0*" (int-to-string month)))
- (day (concat "\\*\\|0*" (int-to-string day)))
- (year
- (concat
- "\\*\\|0*" (int-to-string year)
- (if abbreviated-calendar-year
- (concat "\\|" (int-to-string (% year 100)))
- "")))
- (regexp
- (concat
- "\\(\\`\\|\^M\\|\n\\)" mark "?"
- (regexp-quote bahai-diary-entry-symbol)
- "\\("
- (mapconcat 'eval date-form "\\)\\(")
- "\\)"))
- (case-fold-search t))
- (goto-char (point-min))
- (while (re-search-forward regexp nil t)
- (if backup (re-search-backward "\\<" nil t))
- (if (and (or (char-equal (preceding-char) ?\^M)
- (char-equal (preceding-char) ?\n))
- (not (looking-at " \\|\^I")))
- ;; Diary entry that consists only of date.
- (backward-char 1)
- ;; Found a nonempty diary entry--make it visible and
- ;; add it to the list.
- (let ((entry-start (point))
- (date-start))
- (re-search-backward "\^M\\|\n\\|\\`")
- (setq date-start (point))
- (re-search-forward "\^M\\|\n" nil t 2)
- (while (looking-at " \\|\^I")
- (re-search-forward "\^M\\|\n" nil t))
- (backward-char 1)
- (subst-char-in-region date-start (point) ?\^M ?\n t)
- (add-to-diary-list
- gdate
- (buffer-substring-no-properties entry-start (point))
- (buffer-substring-no-properties
- (1+ date-start) (1- entry-start)))))))
- (setq d (cdr d))))
- (setq gdate
- (calendar-gregorian-from-absolute
- (1+ (calendar-absolute-from-gregorian gdate)))))
- (set-buffer-modified-p diary-modified))
- (goto-char (point-min))))
-
-(defun mark-bahai-diary-entries ()
- "Mark days in the calendar window that have Baha'i date diary entries.
-Each entry in diary-file (or included files) visible in the calendar
-window is marked. Baha'i date entries are prefaced by a
-bahai-diary-entry-symbol \(normally a B`I'). The same
-diary-date-forms govern the style of the Baha'i calendar entries,
-except that the Baha'i month names must be spelled in full. The
-Baha'i months are numbered from 1 to 12 with Baha being 1 and 12 being
-`Ala. Baha'i date diary entries that begin with a
-diary-nonmarking-symbol will not be marked in the calendar. This
-function is provided for use as part of the
-nongregorian-diary-marking-hook."
- (let ((d diary-date-forms))
- (while d
- (let*
- ((date-form (if (equal (car (car d)) 'backup)
- (cdr (car d))
- (car d)));; ignore 'backup directive
- (dayname (diary-name-pattern calendar-day-name-array))
- (monthname
- (concat
- (diary-name-pattern bahai-calendar-month-name-array t)
- "\\|\\*"))
- (month "[0-9]+\\|\\*")
- (day "[0-9]+\\|\\*")
- (year "[0-9]+\\|\\*")
- (l (length date-form))
- (d-name-pos (- l (length (memq 'dayname date-form))))
- (d-name-pos (if (/= l d-name-pos) (+ 2 d-name-pos)))
- (m-name-pos (- l (length (memq 'monthname date-form))))
- (m-name-pos (if (/= l m-name-pos) (+ 2 m-name-pos)))
- (d-pos (- l (length (memq 'day date-form))))
- (d-pos (if (/= l d-pos) (+ 2 d-pos)))
- (m-pos (- l (length (memq 'month date-form))))
- (m-pos (if (/= l m-pos) (+ 2 m-pos)))
- (y-pos (- l (length (memq 'year date-form))))
- (y-pos (if (/= l y-pos) (+ 2 y-pos)))
- (regexp
- (concat
- "\\(\\`\\|\^M\\|\n\\)"
- (regexp-quote bahai-diary-entry-symbol)
- "\\("
- (mapconcat 'eval date-form "\\)\\(")
- "\\)"))
- (case-fold-search t))
- (goto-char (point-min))
- (while (re-search-forward regexp nil t)
- (let* ((dd-name
- (if d-name-pos
- (buffer-substring
- (match-beginning d-name-pos)
- (match-end d-name-pos))))
- (mm-name
- (if m-name-pos
- (buffer-substring
- (match-beginning m-name-pos)
- (match-end m-name-pos))))
- (mm (string-to-int
- (if m-pos
- (buffer-substring
- (match-beginning m-pos)
- (match-end m-pos))
- "")))
- (dd (string-to-int
- (if d-pos
- (buffer-substring
- (match-beginning d-pos)
- (match-end d-pos))
- "")))
- (y-str (if y-pos
- (buffer-substring
- (match-beginning y-pos)
- (match-end y-pos))))
- (yy (if (not y-str)
- 0
- (if (and (= (length y-str) 2)
- abbreviated-calendar-year)
- (let* ((current-y
- (extract-calendar-year
- (calendar-bahai-from-absolute
- (calendar-absolute-from-gregorian
- (calendar-current-date)))))
- (y (+ (string-to-int y-str)
- (* 100 (/ current-y 100)))))
- (if (> (- y current-y) 50)
- (- y 100)
- (if (> (- current-y y) 50)
- (+ y 100)
- y)))
- (string-to-int y-str)))))
- (if dd-name
- (mark-calendar-days-named
- (cdr (assoc-ignore-case (substring dd-name 0 3)
- (calendar-make-alist
- calendar-day-name-array
- 0
- '(lambda (x) (substring x 0 3))))))
- (if mm-name
- (if (string-equal mm-name "*")
- (setq mm 0)
- (setq mm
- (cdr (assoc-ignore-case
- mm-name
- (calendar-make-alist
- bahai-calendar-month-name-array))))))
- (mark-bahai-calendar-date-pattern mm dd yy)))))
- (setq d (cdr d)))))
-
-(defun mark-bahai-calendar-date-pattern (month day year)
- "Mark dates in calendar window that conform to Baha'i date MONTH/DAY/YEAR.
-A value of 0 in any position is a wildcard."
- (save-excursion
- (set-buffer calendar-buffer)
- (if (and (/= 0 month) (/= 0 day))
- (if (/= 0 year)
- ;; Fully specified Baha'i date.
- (let ((date (calendar-gregorian-from-absolute
- (calendar-absolute-from-bahai
- (list month day year)))))
- (if (calendar-date-is-visible-p date)
- (mark-visible-calendar-date date)))
- ;; Month and day in any year--this taken from the holiday stuff.
- (let* ((bahai-date (calendar-bahai-from-absolute
- (calendar-absolute-from-gregorian
- (list displayed-month 15 displayed-year))))
- (m (extract-calendar-month bahai-date))
- (y (extract-calendar-year bahai-date))
- (date))
- (if (< m 1)
- nil;; Baha'i calendar doesn't apply.
- (increment-calendar-month m y (- 10 month))
- (if (> m 7);; Baha'i date might be visible
- (let ((date (calendar-gregorian-from-absolute
- (calendar-absolute-from-bahai
- (list month day y)))))
- (if (calendar-date-is-visible-p date)
- (mark-visible-calendar-date date)))))))
- ;; Not one of the simple cases--check all visible dates for match.
- ;; Actually, the following code takes care of ALL of the cases, but
- ;; it's much too slow to be used for the simple (common) cases.
- (let ((m displayed-month)
- (y displayed-year)
- (first-date)
- (last-date))
- (increment-calendar-month m y -1)
- (setq first-date
- (calendar-absolute-from-gregorian
- (list m 1 y)))
- (increment-calendar-month m y 2)
- (setq last-date
- (calendar-absolute-from-gregorian
- (list m (calendar-last-day-of-month m y) y)))
- (calendar-for-loop date from first-date to last-date do
- (let* ((b-date (calendar-bahai-from-absolute date))
- (i-month (extract-calendar-month b-date))
- (i-day (extract-calendar-day b-date))
- (i-year (extract-calendar-year b-date)))
- (and (or (zerop month)
- (= month i-month))
- (or (zerop day)
- (= day i-day))
- (or (zerop year)
- (= year i-year))
- (mark-visible-calendar-date
- (calendar-gregorian-from-absolute date)))))))))
-
-(defun insert-bahai-diary-entry (arg)
- "Insert a diary entry.
-For the Baha'i date corresponding to the date indicated by point.
-Prefix arg will make the entry nonmarking."
- (interactive "P")
- (let* ((calendar-month-name-array bahai-calendar-month-name-array))
- (make-diary-entry
- (concat
- bahai-diary-entry-symbol
- (calendar-date-string
- (calendar-bahai-from-absolute
- (calendar-absolute-from-gregorian
- (calendar-cursor-to-date t)))
- nil t))
- arg)))
-
-(defun insert-monthly-bahai-diary-entry (arg)
- "Insert a monthly diary entry.
-For the day of the Baha'i month corresponding to the date indicated by point.
-Prefix arg will make the entry nonmarking."
- (interactive "P")
- (let* ((calendar-date-display-form
- (if european-calendar-style '(day " * ") '("* " day )))
- (calendar-month-name-array bahai-calendar-month-name-array))
- (make-diary-entry
- (concat
- bahai-diary-entry-symbol
- (calendar-date-string
- (calendar-bahai-from-absolute
- (calendar-absolute-from-gregorian
- (calendar-cursor-to-date t)))))
- arg)))
-
-(defun insert-yearly-bahai-diary-entry (arg)
- "Insert an annual diary entry.
-For the day of the Baha'i year corresponding to the date indicated by point.
-Prefix arg will make the entry nonmarking."
- (interactive "P")
- (let* ((calendar-date-display-form
- (if european-calendar-style
- '(day " " monthname)
- '(monthname " " day)))
- (calendar-month-name-array bahai-calendar-month-name-array))
- (make-diary-entry
- (concat
- bahai-diary-entry-symbol
- (calendar-date-string
- (calendar-bahai-from-absolute
- (calendar-absolute-from-gregorian
- (calendar-cursor-to-date t)))))
- arg)))
-
-(provide 'cal-bahai)
-
-;;; cal-bahai.el ends here
projects / emacs.git / commitdiff