;;; cal-bahai.el --- calendar functions for the Bahá'í calendar.
-;; Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
+;; Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
;; Free Software Foundation, Inc.
;; Author: John Wiegley <johnw@gnu.org>
;; This file is part of GNU Emacs.
-;; GNU Emacs is free software; you can redistribute it and/or modify
+;; 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.
+;; 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
;; 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.
+;; 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.el that deal with the Bahá'í calendar.
+;; 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
;;; Code:
-(require 'cal-julian)
+(require 'calendar)
(defconst calendar-bahai-month-name-array
["Bahá" "Jalál" "Jamál" "`Azamat" "Núr" "Rahmat" "Kalimát" "Kamál"
"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 19, 622 AD (Julian).")
+ "Absolute date of start of Bahá'í calendar = March 21, 1844 AD.")
(defun calendar-bahai-leap-year-p (year)
- "True if YEAR is a leap year on the Bahá'í calendar."
+ "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))
- "Used by `calendar-absolute-from-bahai'.")
+ "Number of leap years between 1 and 1844 AD, inclusive.
+Used by `calendar-bahai-to-absolute'.")
-(defun calendar-absolute-from-bahai (date)
+(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 (extract-calendar-month date))
- (day (extract-calendar-day date))
- (year (extract-calendar-year date))
+ (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))
(* 365 (1- year)) ; days in prior years
leap-days
(calendar-sum m 1 (< m month) 19)
- (if (= month 19) 4 0)
+ (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 year corresponding to the 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))
- (year (+ (- (extract-calendar-year greg) 1844)
- (if (or (> (extract-calendar-month greg) 3)
- (and (= (extract-calendar-month greg) 3)
- (>= (extract-calendar-day greg) 21)))
+ (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-absolute-from-bahai
- (list m 19 year)))
+ (> date (calendar-bahai-to-absolute (list m 19 year)))
1)))
(day ; calculate the day by subtraction
(- date
- (1- (calendar-absolute-from-bahai (list month 1 year))))))
+ (1- (calendar-bahai-to-absolute (list month 1 year))))))
(list month day year))))
;;;###cal-autoload
(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))
- (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)))
- (year (int-to-string y))
- (month (int-to-string m))
- dayname)
- (mapconcat 'eval calendar-date-display-form "")))
+ (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)
- (message "Bahá'í date: %s"
- (calendar-bahai-date-string (calendar-cursor-to-date t))))
+ (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-prompt-for-date ()
- "Ask for a Bahá'í date."
+(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)))
- (int-to-string
- (extract-calendar-year
+ (number-to-string
+ (calendar-extract-year
(calendar-bahai-from-absolute
(calendar-absolute-from-gregorian today))))))
(completion-ignore-case t)
(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-prompt-for-date))
+ (interactive (calendar-bahai-read-date))
(calendar-goto-date (calendar-gregorian-from-absolute
- (calendar-absolute-from-bahai date)))
+ (calendar-bahai-to-absolute date)))
(or noecho (calendar-bahai-print-date)))
(define-obsolete-function-alias
;;;###holiday-autoload
(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."
+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 (extract-calendar-month bahai-date))
- (y (extract-calendar-year bahai-date))
- (date))
+ (m (calendar-extract-month bahai-date))
+ (y (calendar-extract-year bahai-date))
+ date)
(unless (< m 1) ; 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))))))))
+ ;; 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")
-;; FIXME diary-bahai-mark-entries said the names could be spelled in full.
;;;###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 `bahai-diary-entry-symbol'
+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 must be given
-numerically. The Bahá'í months are numbered from 1 to 19 with Bahá being
+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
-`nongregorian-diary-listing-hook'."
+`diary-nongregorian-listing-hook'."
(diary-list-entries-1 calendar-bahai-month-name-array
- bahai-diary-entry-symbol
+ diary-bahai-entry-symbol
'calendar-bahai-from-absolute))
(define-obsolete-function-alias
'list-bahai-diary-entries 'diary-bahai-list-entries "23.1")
(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 `mark-visible-calendar-date' as MARK."
+passed to `calendar-mark-visible-date' as MARK."
(calendar-mark-1 month day year 'calendar-bahai-from-absolute
- 'calendar-absolute-from-bahai color))
+ 'calendar-bahai-to-absolute color))
(define-obsolete-function-alias
'mark-bahai-calendar-date-pattern 'calendar-bahai-mark-date-pattern "23.1")
"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-month-name-array
- bahai-diary-entry-symbol
- 'calendar-bahai-from-absolute
- 'calendar-bahai-mark-date-pattern))
+ (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")
- (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)))
+ (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")
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)))
+ (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")
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)))
+ (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 list-sexp-diary-entries, where DATE is bound.
+;; 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."