-;;; cal-bahai.el --- calendar functions for the Bahá'í calendar.
-
-;; Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
-;; Free Software Foundation, Inc.
-
-;; Author: John Wiegley <johnw@gnu.org>
-;; Keywords: calendar
-;; Human-Keywords: Bahá'í calendar, Bahá'í, 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 3, 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., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
-
-;;; Commentary:
-
-;; This collection of functions implements the features of calendar.el
-;; and diary.el that deal with the Bahá'í calendar.
-
-;; The Bahá'í (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 Ayyám-i-Há (days of Há), 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 (Há
-;; 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
-;; Váhids. A cycle of 19 Váhids (361 years) is called a Kullu-Shay,
-;; which means "all things".
-
-;; The calendar was named the "Badí` calendar" by its author, the Báb.
-;; 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 Ayyám-i-Há are encoded as zero and negative
-;; offsets from the first day of the final month. So, (19 -3 157) is
-;; the first day of Ayyám-i-Há, in the year 157 BE.
-
-;;; Code:
-
-(defvar date)
-(defvar displayed-month)
-(defvar displayed-year)
-(defvar number)
-(defvar original-date)
-
-(require 'cal-julian)
-
-(defconst calendar-bahai-month-name-array
- ["Bahá" "Jalál" "Jamál" "`Azamat" "Núr" "Rahmat" "Kalimát" "Kamál"
- "Asmá" "`Izzat" "Mashiyyat" "`Ilm" "Qudrat" "Qawl" "Masá'il"
- "Sharaf" "Sultán" "Mulk" "`Alá"])
-
-(defconst calendar-bahai-epoch (calendar-absolute-from-gregorian '(3 21 1844))
- "Absolute date of start of Bahá'í calendar = March 19, 622 A.D. (Julian).")
-
-(defun calendar-bahai-leap-year-p (year)
- "True if YEAR is a leap year on the Bahá'í calendar."
- (calendar-leap-year-p (+ year 1844)))
-
-(defconst calendar-bahai-leap-base
- (+ (/ 1844 4) (- (/ 1844 100)) (/ 1844 400)))
-
-(defun calendar-absolute-from-bahai (date)
- "Compute absolute date from Bahá'í 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) 1844))
- (leap-days (- (+ (/ prior-years 4) ; leap days in prior years
- (- (/ prior-years 100))
- (/ prior-years 400))
- calendar-bahai-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)
- "Bahá'í year corresponding to the absolute DATE."
- (if (< date calendar-bahai-epoch)
- (list 0 0 0) ; pre-Bahá'í date
- (let* ((greg (calendar-gregorian-from-absolute date))
- (year (+ (- (extract-calendar-year greg) 1844)
- (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))))
-
-;;;###autoload
-(defun calendar-bahai-date-string (&optional date)
- "String of Bahá'í 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))
- "Ayyám-i-Há"
- (aref calendar-bahai-month-name-array (1- m))))
- (day (int-to-string
- (if (<= d 0)
- (if (calendar-bahai-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 ""))))
-
-;;;###autoload
-(defun calendar-bahai-print-date ()
- "Show the Bahá'í calendar equivalent of the selected date."
- (interactive)
- (message "Bahá'í date: %s"
- (calendar-bahai-date-string (calendar-cursor-to-date t))))
-
-;;;###autoload
-(defun calendar-bahai-goto-date (date &optional noecho)
- "Move cursor to Bahá'í date DATE.
-Echo Bahá'í date unless NOECHO is t."
- (interactive (calendar-bahai-prompt-for-date))
- (calendar-goto-date (calendar-gregorian-from-absolute
- (calendar-absolute-from-bahai date)))
- (or noecho (calendar-bahai-print-date)))
-
-(defun calendar-bahai-prompt-for-date ()
- "Ask for a Bahá'í date."
- (let* ((today (calendar-current-date))
- (year (calendar-read
- "Bahá'í calendar year (not 0): "
- (lambda (x) (not (zerop x)))
- (int-to-string
- (extract-calendar-year
- (calendar-bahai-from-absolute
- (calendar-absolute-from-gregorian today))))))
- (completion-ignore-case t)
- (month (cdr (assoc
- (completing-read
- "Bahá'í calendar month name: "
- (mapcar 'list
- (append calendar-bahai-month-name-array nil))
- nil t)
- (calendar-make-alist calendar-bahai-month-name-array
- 1))))
- (day (calendar-read "Bahá'í calendar day (1-19): "
- (lambda (x) (and (< 0 x) (<= x 19))))))
- (list (list month day year))))
-
-(defun diary-bahai-date ()
- "Bahá'í calendar equivalent of date diary entry."
- (format "Bahá'í date: %s" (calendar-bahai-date-string date)))
-
-(defun holiday-bahai (month day string)
- "Holiday on MONTH, DAY (Bahá'í) called STRING.
-If MONTH, DAY (Bahá'í) 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 ; Bahá'í calendar doesn't apply
- (increment-calendar-month m y (- 10 month))
- (if (> m 7) ; Bahá'í 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))))))))
-
-;; d-b-l-e should be called from diary code.
-(declare-function add-to-diary-list "diary-lib"
- (date string specifier &optional marker globcolor literal))
-
-(defun diary-bahai-list-entries ()
- "Add any Bahá'í date entries from the diary file to `diary-entries-list'.
-Bahá'í 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 Bahá'í calendar entries, except that the
-Bahá'í month names must be given numerically. The Bahá'í months are
-numbered from 1 to 19 with Bahá being 1 and 19 being `Alá. If a
-Bahá'í 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)))
- (dotimes (idummy number)
- (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
- calendar-bahai-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))))
-
-(declare-function diary-name-pattern "diary-lib"
- (string-array &optional abbrev-array paren))
-
-(declare-function mark-calendar-days-named "diary-lib"
- (dayname &optional color))
-
-(defun diary-bahai-mark-entries ()
- "Mark days in the calendar window that have Bahá'í date diary entries.
-Each entry in `diary-file' (or included files) visible in the calendar
-window is marked. Bahá'í date entries are prefaced by
-`bahai-diary-entry-symbol' (normally a \"B\"). The same
-`diary-date-forms' govern the style of the Bahá'í calendar entries,
-except that the Bahá'í month names must be spelled in full. The
-Bahá'í months are numbered from 1 to 12 with Bahá being 1 and 12 being
-`Alá. Bahá'í date diary entries that begin with `diary-nonmarking-symbol'
-will not be marked in the calendar. This function is provided for use as
-part of `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 calendar-bahai-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-number
- (if m-pos
- (buffer-substring
- (match-beginning m-pos)
- (match-end m-pos))
- "")))
- (dd (string-to-number
- (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-number y-str)
- (* 100 (/ current-y 100)))))
- (if (> (- y current-y) 50)
- (- y 100)
- (if (> (- current-y y) 50)
- (+ y 100)
- y)))
- (string-to-number y-str)))))
- (if dd-name
- (mark-calendar-days-named
- (cdr (assoc-string (substring dd-name 0 3)
- (calendar-make-alist
- calendar-day-name-array
- 0
- (lambda (x) (substring x 0 3)))
- t)))
- (if mm-name
- (if (string-equal mm-name "*")
- (setq mm 0)
- (setq mm
- (cdr (assoc-string
- mm-name
- (calendar-make-alist
- calendar-bahai-month-name-array)
- t)))))
- (calendar-bahai-mark-date-pattern mm dd yy)))))
- (setq d (cdr d)))))
-
-(defun calendar-bahai-mark-date-pattern (month day year)
- "Mark dates in calendar window that conform to Bahá'í date MONTH/DAY/YEAR.
-A value of 0 in any position is a wildcard."
- (save-excursion
- (set-buffer calendar-buffer)
- (if (and (not (zerop month)) (not (zerop day)))
- (if (not (zerop year))
- ;; Fully specified Bahá'í 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 ; Bahá'í calendar doesn't apply
- (increment-calendar-month m y (- 10 month))
- (if (> m 7) ; Bahá'í 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)))))))))
-
-;;;###autoload
-(defun diary-bahai-insert-entry (arg)
- "Insert a diary entry.
-For the Bahá'í date corresponding to the date indicated by point.
-Prefix argument ARG makes the entry nonmarking."
- (interactive "P")
- (let* ((calendar-month-name-array calendar-bahai-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)))
-
-;;;###autoload
-(defun diary-bahai-insert-monthly-entry (arg)
- "Insert a monthly diary entry.
-For the day of the Bahá'í month corresponding to the date indicated by point.
-Prefix argument ARG makes the entry nonmarking."
- (interactive "P")
- (let* ((calendar-date-display-form
- (if european-calendar-style '(day " * ") '("* " day )))
- (calendar-month-name-array calendar-bahai-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)))
-
-;;;###autoload
-(defun diary-bahai-insert-yearly-entry (arg)
- "Insert an annual diary entry.
-For the day of the Bahá'í year corresponding to the date indicated by point.
-Prefix argument 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 calendar-bahai-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)))
-
-;; Backward compatibility.
-(define-obsolete-function-alias
- 'list-bahai-diary-entries 'diary-bahai-list-entries "23.1")
-(define-obsolete-function-alias
- 'mark-bahai-diary-entries 'diary-bahai-mark-entries "23.1")
-(define-obsolete-function-alias
- 'insert-bahai-diary-entry 'diary-bahai-insert-entry "23.1")
-(define-obsolete-function-alias
- 'insert-monthly-bahai-diary-entry 'diary-bahai-insert-monthly-entry "23.1")
-(define-obsolete-function-alias
- 'insert-yearly-bahai-diary-entry 'diary-bahai-insert-yearly-entry "23.1")
-(define-obsolete-function-alias
- 'mark-bahai-calendar-date-pattern 'calendar-bahai-mark-date-pattern "23.1")
-(define-obsolete-function-alias
- 'calendar-goto-bahai-date 'calendar-bahai-goto-date "23.1")
-(define-obsolete-function-alias
- 'calendar-print-bahai-date 'calendar-bahai-print-date "23.1")
-
-(provide 'cal-bahai)
-
-;; Local Variables:
-;; coding: utf-8
-;; generated-autoload-file: "cal-loaddefs.el"
-;; End:
-
-;; arch-tag: c1cb1d67-862a-4264-a01c-41cb4df01f14
-;;; cal-bahai.el ends here
+;;; cal-bahai.el --- calendar functions for the Bahá'í calendar.
+
+;; Copyright (C) 2001-2011
+;; Free Software Foundation, Inc.
+
+;; Author: John Wiegley <johnw@gnu.org>
+;; Keywords: calendar
+;; Human-Keywords: Bahá'í calendar, Bahá'í, Baha'i, Bahai, calendar, diary
+;; Package: 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This collection of functions implements the features of calendar.el
+;; and diary-lib.el that deal with the Bahá'í calendar.
+
+;; The Bahá'í (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 Ayyám-i-Há (days of Há), 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 (Há
+;; 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
+;; Váhids. A cycle of 19 Váhids (361 years) is called a Kullu-Shay,
+;; which means "all things".
+
+;; The calendar was named the "Badí` calendar" by its author, the Báb.
+;; 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 Ayyám-i-Há are encoded as zero and negative
+;; offsets from the first day of the final month. So, (19 -3 157) is
+;; the first day of Ayyám-i-Há, in the year 157 BE.
+
+;;; Code:
+
+(require 'calendar)
+
+(defconst calendar-bahai-month-name-array
+ ["Bahá" "Jalál" "Jamál" "`Azamat" "Núr" "Rahmat" "Kalimát" "Kamál"
+ "Asmá" "`Izzat" "Mashiyyat" "`Ilm" "Qudrat" "Qawl" "Masá'il"
+ "Sharaf" "Sultán" "Mulk" "`Alá"]
+ "Array of the month names in the Bahá'í calendar.")
+
+(defconst calendar-bahai-epoch (calendar-absolute-from-gregorian '(3 21 1844))
+ "Absolute date of start of Bahá'í calendar = March 21, 1844 AD.")
+
+(defun calendar-bahai-leap-year-p (year)
+ "True if Bahá'í YEAR is a leap year in the Bahá'í calendar."
+ (calendar-leap-year-p (+ year 1844)))
+
+(defconst calendar-bahai-leap-base
+ (+ (/ 1844 4) (- (/ 1844 100)) (/ 1844 400))
+ "Number of leap years between 1 and 1844 AD, inclusive.
+Used by `calendar-bahai-to-absolute'.")
+
+(defun calendar-bahai-to-absolute (date)
+ "Compute absolute date from Bahá'í date DATE.
+The absolute date is the number of days elapsed since the (imaginary)
+Gregorian date Sunday, December 31, 1 BC."
+ (let* ((month (calendar-extract-month date))
+ (day (calendar-extract-day date))
+ (year (calendar-extract-year date))
+ (prior-years (+ (1- year) 1844))
+ (leap-days (- (+ (/ prior-years 4) ; leap days in prior years
+ (- (/ prior-years 100))
+ (/ prior-years 400))
+ calendar-bahai-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)
+ (if (calendar-bahai-leap-year-p year) 5 4)
+ 0)
+ day))) ; days so far this month
+
+(define-obsolete-function-alias 'calendar-absolute-from-bahai
+ 'calendar-bahai-to-absolute "23.1")
+
+(defun calendar-bahai-from-absolute (date)
+ "Bahá'í date (month day year) corresponding to the absolute DATE."
+ (if (< date calendar-bahai-epoch)
+ (list 0 0 0) ; pre-Bahá'í date
+ (let* ((greg (calendar-gregorian-from-absolute date))
+ (gmonth (calendar-extract-month greg))
+ (year (+ (- (calendar-extract-year greg) 1844)
+ (if (or (> gmonth 3)
+ (and (= gmonth 3)
+ (>= (calendar-extract-day greg) 21)))
+ 1 0)))
+ (month ; search forward from Baha
+ (1+ (calendar-sum m 1
+ (> date (calendar-bahai-to-absolute (list m 19 year)))
+ 1)))
+ (day ; calculate the day by subtraction
+ (- date
+ (1- (calendar-bahai-to-absolute (list month 1 year))))))
+ (list month day year))))
+
+;;;###cal-autoload
+(defun calendar-bahai-date-string (&optional date)
+ "String of Bahá'í 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 (calendar-extract-year bahai-date)))
+ (if (< y 1)
+ "" ; pre-Bahai
+ (let* ((m (calendar-extract-month bahai-date))
+ (d (calendar-extract-day bahai-date))
+ (monthname (if (and (= m 19)
+ (<= d 0))
+ "Ayyám-i-Há"
+ (aref calendar-bahai-month-name-array (1- m))))
+ (day (number-to-string
+ (if (<= d 0)
+ (+ d (if (calendar-bahai-leap-year-p y) 5 4))
+ d)))
+ (year (number-to-string y))
+ (month (number-to-string m))
+ dayname)
+ ;; Can't call calendar-date-string because of monthname oddity.
+ (mapconcat 'eval calendar-date-display-form "")))))
+
+;;;###cal-autoload
+(defun calendar-bahai-print-date ()
+ "Show the Bahá'í calendar equivalent of the selected date."
+ (interactive)
+ (let ((s (calendar-bahai-date-string (calendar-cursor-to-date t))))
+ (if (string-equal s "")
+ (message "Date is pre-Bahá'í")
+ (message "Bahá'í date: %s" s))))
+
+(define-obsolete-function-alias
+ 'calendar-print-bahai-date 'calendar-bahai-print-date "23.1")
+
+(defun calendar-bahai-read-date ()
+ "Interactively read the arguments for a Bahá'í date command.
+Reads a year, month and day."
+ (let* ((today (calendar-current-date))
+ (year (calendar-read
+ "Bahá'í calendar year (not 0): "
+ (lambda (x) (not (zerop x)))
+ (number-to-string
+ (calendar-extract-year
+ (calendar-bahai-from-absolute
+ (calendar-absolute-from-gregorian today))))))
+ (completion-ignore-case t)
+ (month (cdr (assoc
+ (completing-read
+ "Bahá'í calendar month name: "
+ (mapcar 'list
+ (append calendar-bahai-month-name-array nil))
+ nil t)
+ (calendar-make-alist calendar-bahai-month-name-array
+ 1))))
+ (day (calendar-read "Bahá'í calendar day (1-19): "
+ (lambda (x) (and (< 0 x) (<= x 19))))))
+ (list (list month day year))))
+
+(define-obsolete-function-alias
+ 'calendar-bahai-prompt-for-date 'calendar-bahai-read-date "23.1")
+
+;;;###cal-autoload
+(defun calendar-bahai-goto-date (date &optional noecho)
+ "Move cursor to Bahá'í date DATE; echo Bahá'í date unless NOECHO is non-nil."
+ (interactive (calendar-bahai-read-date))
+ (calendar-goto-date (calendar-gregorian-from-absolute
+ (calendar-bahai-to-absolute date)))
+ (or noecho (calendar-bahai-print-date)))
+
+(define-obsolete-function-alias
+ 'calendar-goto-bahai-date 'calendar-bahai-goto-date "23.1")
+
+(defvar displayed-month)
+(defvar displayed-year)
+
+;;;###holiday-autoload
+(defun holiday-bahai (month day string)
+ "Holiday on MONTH, DAY (Bahá'í) called STRING.
+If MONTH, DAY (Bahá'í) is visible in the current calendar window,
+returns the corresponding Gregorian date in the form of the
+list (((month day year) STRING)). Otherwise, returns nil."
+ ;; Since the calendar window shows 3 months at a time, there are
+ ;; approx +/- 45 days either side of the central month.
+ ;; Since the Bahai months have 19 days, this means up to +/- 3 months.
+ (let* ((bahai-date (calendar-bahai-from-absolute
+ (calendar-absolute-from-gregorian
+ (list displayed-month 15 displayed-year))))
+ (m (calendar-extract-month bahai-date))
+ (y (calendar-extract-year bahai-date))
+ date)
+ (unless (< m 1) ; Bahá'í calendar doesn't apply
+ ;; Cf holiday-fixed, holiday-islamic.
+ ;; With a +- 3 month calendar window, and 19 months per year,
+ ;; month 16 is special. When m16 is central is when the
+ ;; end-of-year first appears. When m1 is central, m16 is no
+ ;; longer visible. Hence we can do a one-sided test to see if
+ ;; m16 is visible. m16 is visible when the central month >= 13.
+ ;; To see if other months are visible we can shift the range
+ ;; accordingly.
+ (calendar-increment-month m y (- 16 month) 19)
+ (and (> m 12) ; Bahá'í date might be visible
+ (calendar-date-is-visible-p
+ (setq date (calendar-gregorian-from-absolute
+ (calendar-bahai-to-absolute (list month day y)))))
+ (list (list date string))))))
+
+(autoload 'holiday-fixed "holidays")
+
+;;;###holiday-autoload
+(defun holiday-bahai-new-year ()
+ "Holiday entry for the Bahá'í New Year, if visible in the calendar window."
+ (holiday-fixed 3 21
+ (format "Bahá'í New Year (Naw-Ruz) %d"
+ (- displayed-year (1- 1844)))))
+
+;;;###holiday-autoload
+(defun holiday-bahai-ridvan (&optional all)
+ "Holidays related to Ridvan, as visible in the calendar window.
+Only considers the first, ninth, and twelfth days, unless ALL or
+`calendar-bahai-all-holidays-flag' is non-nil."
+ (let ((ord ["First" "Second" "Third" "Fourth" "Fifth" "Sixth"
+ "Seventh" "Eighth" "Ninth" "Tenth" "Eleventh" "Twelfth"])
+ (show '(0 8 11))
+ rid h)
+ (if (or all calendar-bahai-all-holidays-flag)
+ (setq show (number-sequence 0 11)))
+ ;; More trouble than it was worth...?
+ (dolist (i show (nreverse rid))
+ (if (setq h (holiday-fixed (if (< i 10) 4 5)
+ (+ i (if (< i 10) 21 -9))
+ (format "%s Day of Ridvan" (aref ord i))))
+ (push (car h) rid)))))
+
+(autoload 'diary-list-entries-1 "diary-lib")
+
+;;;###diary-autoload
+(defun diary-bahai-list-entries ()
+ "Add any Bahá'í date entries from the diary file to `diary-entries-list'.
+Bahá'í date diary entries must be prefaced by `diary-bahai-entry-symbol'
+\(normally a `B'). The same diary date forms govern the style of the
+Bahá'í calendar entries, except that the Bahá'í month names cannot be
+abbreviated. The Bahá'í months are numbered from 1 to 19 with Bahá being
+1 and 19 being `Alá. If a Bahá'í date diary entry begins with
+`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
+`diary-nongregorian-listing-hook'."
+ (diary-list-entries-1 calendar-bahai-month-name-array
+ diary-bahai-entry-symbol
+ 'calendar-bahai-from-absolute))
+(define-obsolete-function-alias
+ 'list-bahai-diary-entries 'diary-bahai-list-entries "23.1")
+
+
+(autoload 'calendar-mark-1 "diary-lib")
+
+;;;###diary-autoload
+(defun calendar-bahai-mark-date-pattern (month day year &optional color)
+ "Mark dates in calendar window that conform to Bahá'í date MONTH/DAY/YEAR.
+A value of 0 in any position is a wildcard. Optional argument COLOR is
+passed to `calendar-mark-visible-date' as MARK."
+ (calendar-mark-1 month day year 'calendar-bahai-from-absolute
+ 'calendar-bahai-to-absolute color))
+
+(define-obsolete-function-alias
+ 'mark-bahai-calendar-date-pattern 'calendar-bahai-mark-date-pattern "23.1")
+
+
+(autoload 'diary-mark-entries-1 "diary-lib")
+
+;;;###diary-autoload
+(defun diary-bahai-mark-entries ()
+ "Mark days in the calendar window that have Bahá'í date diary entries.
+Marks each entry in `diary-file' (or included files) visible in the calendar
+window. See `diary-bahai-list-entries' for more information."
+ (diary-mark-entries-1 'calendar-bahai-mark-date-pattern
+ calendar-bahai-month-name-array
+ diary-bahai-entry-symbol
+ 'calendar-bahai-from-absolute))
+
+(define-obsolete-function-alias
+ 'mark-bahai-diary-entries 'diary-bahai-mark-entries "23.1")
+
+
+(autoload 'diary-insert-entry-1 "diary-lib")
+
+;;;###cal-autoload
+(defun diary-bahai-insert-entry (arg)
+ "Insert a diary entry.
+For the Bahá'í date corresponding to the date indicated by point.
+Prefix argument ARG makes the entry nonmarking."
+ (interactive "P")
+ (diary-insert-entry-1 nil arg calendar-bahai-month-name-array
+ diary-bahai-entry-symbol
+ 'calendar-bahai-from-absolute))
+
+(define-obsolete-function-alias
+ 'insert-bahai-diary-entry 'diary-bahai-insert-entry "23.1")
+
+;;;###cal-autoload
+(defun diary-bahai-insert-monthly-entry (arg)
+ "Insert a monthly diary entry.
+For the day of the Bahá'í month corresponding to the date indicated by point.
+Prefix argument ARG makes the entry nonmarking."
+ (interactive "P")
+ (diary-insert-entry-1 'monthly arg calendar-bahai-month-name-array
+ diary-bahai-entry-symbol
+ 'calendar-bahai-from-absolute))
+
+(define-obsolete-function-alias
+ 'insert-monthly-bahai-diary-entry 'diary-bahai-insert-monthly-entry "23.1")
+
+;;;###cal-autoload
+(defun diary-bahai-insert-yearly-entry (arg)
+ "Insert an annual diary entry.
+For the day of the Bahá'í year corresponding to the date indicated by point.
+Prefix argument ARG will make the entry nonmarking."
+ (interactive "P")
+ (diary-insert-entry-1 'yearly arg calendar-bahai-month-name-array
+ diary-bahai-entry-symbol
+ 'calendar-bahai-from-absolute))
+
+(define-obsolete-function-alias
+ 'insert-yearly-bahai-diary-entry 'diary-bahai-insert-yearly-entry "23.1")
+
+(defvar date)
+
+;; To be called from diary-list-sexp-entries, where DATE is bound.
+;;;###diary-autoload
+(defun diary-bahai-date ()
+ "Bahá'í calendar equivalent of date diary entry."
+ (format "Bahá'í date: %s" (calendar-bahai-date-string date)))
+
+
+(provide 'cal-bahai)
+
+;; Local Variables:
+;; coding: utf-8
+;; End:
+
+;;; cal-bahai.el ends here
HCoop / bpt / emacs.git / blobdiff