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Gerd Moellmann
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;;; cal-bahai.el --- calendar functions for the Baha'i calendar.
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;; Copyright (C) 2001 Free Software Foundation, Inc.
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;; Author: John Wiegley <johnw@gnu.org>
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;; Keywords: calendar
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;; Human-Keywords: Baha'i calendar, Baha'i, Bahai, calendar, diary
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This collection of functions implements the features of calendar.el
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;; and diary.el that deal with the Baha'i calendar.
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;; The Baha'i (http://www.bahai.org) calendar system is based on a
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;; solar cycle of 19 months with 19 days each. The four remaining
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;; "intercalary" days are called the Ayyam-i-Ha (days of Ha), and are
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;; placed between the 18th and 19th months. They are meant as a time
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;; of festivals preceding the 19th month, which is the month of
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;; fasting. In Gregorian leap years, there are 5 of these days (Ha
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;; has the numerical value of 5 in the arabic abjad, or
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;; letter-to-number, reckoning).
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;; Each month is named after an attribute of God, as are the 19 days
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;; -- which have the same names as the months. There is also a name
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;; for each year in every 19 year cycle. These cycles are called
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;; Vahids. A cycle of 19 Vahids (361 years) is called a Kullu-Shay,
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;; which means "all things".
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;; The calendar was named the "Badi calendar" by its author, the Bab.
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;; It uses a week of seven days, corresponding to the Gregorian week,
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;; each of which has its own name, again patterned after the
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;; attributes of God.
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;; Note: The days of Ayyam-i-Ha are encoded as zero and negative
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;; offsets from the first day of the final month. So, (19 -3 157) is
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;; the first day of Ayyam-i-Ha, in the year 157 BE.
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;;; Code:
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(require 'cal-julian)
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(defvar bahai-calendar-month-name-array
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["Baha" "Jalal" "Jamal" "`Azamat" "Nur" "Rahmat" "Kalimat" "Kamal"
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"Asma" "`Izzat" "Mashiyyat" "`Ilm" "Qudrat" "Qawl" "Masa'il"
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"Sharaf" "Sultan" "Mulk" "`Ala"])
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(defvar calendar-bahai-epoch (calendar-absolute-from-gregorian '(3 21 1843))
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"Absolute date of start of Baha'i calendar = March 19, 622 A.D. (Julian).")
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(defun bahai-calendar-leap-year-p (year)
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"True if YEAR is a leap year on the Baha'i calendar."
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(calendar-leap-year-p (+ year 1843)))
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(defvar bahai-calendar-leap-base
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(+ (/ 1843 4) (- (/ 1843 100)) (/ 1843 400)))
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(defun calendar-absolute-from-bahai (date)
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"Compute absolute date from Baha'i date DATE.
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The absolute date is the number of days elapsed since the (imaginary)
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Gregorian date Sunday, December 31, 1 BC."
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(let* ((month (extract-calendar-month date))
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(day (extract-calendar-day date))
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(year (extract-calendar-year date))
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(prior-years (+ (1- year) 1843))
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(leap-days (- (+ (/ prior-years 4) ; Leap days in prior years.
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(- (/ prior-years 100))
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(/ prior-years 400))
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bahai-calendar-leap-base)))
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(+ (1- calendar-bahai-epoch) ; Days before epoch
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(* 365 (1- year)) ; Days in prior years.
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leap-days
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(calendar-sum m 1 (< m month) 19)
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(if (= month 19) 4 0)
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day))) ; Days so far this month.
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(defun calendar-bahai-from-absolute (date)
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"Baha'i year corresponding to the absolute DATE."
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(if (< date calendar-bahai-epoch)
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(list 0 0 0) ;; pre-Baha'i date
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(let* ((greg (calendar-gregorian-from-absolute date))
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(year (+ (- (extract-calendar-year greg) 1843)
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(if (or (> (extract-calendar-month greg) 3)
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(and (= (extract-calendar-month greg) 3)
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(>= (extract-calendar-day greg) 21)))
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1 0)))
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(month ;; Search forward from Baha.
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(1+ (calendar-sum m 1
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(> date
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(calendar-absolute-from-bahai
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(list m 19 year)))
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1)))
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(day ;; Calculate the day by subtraction.
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(- date
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(1- (calendar-absolute-from-bahai (list month 1 year))))))
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(list month day year))))
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(defun calendar-bahai-date-string (&optional date)
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"String of Baha'i date of Gregorian DATE.
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Defaults to today's date if DATE is not given."
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(let* ((bahai-date (calendar-bahai-from-absolute
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(calendar-absolute-from-gregorian
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(or date (calendar-current-date)))))
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(y (extract-calendar-year bahai-date))
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(m (extract-calendar-month bahai-date))
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(d (extract-calendar-day bahai-date)))
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(let ((monthname
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(if (and (= m 19)
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(<= d 0))
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"Ayyam-i-Ha"
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(aref bahai-calendar-month-name-array (1- m))))
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(day (int-to-string
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(if (<= d 0)
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(if (bahai-calendar-leap-year-p y)
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(+ d 5)
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(+ d 4))
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d)))
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(dayname nil)
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(month (int-to-string m))
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(year (int-to-string y)))
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(mapconcat 'eval calendar-date-display-form ""))))
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(defun calendar-print-bahai-date ()
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"Show the Baha'i calendar equivalent of the selected date."
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(interactive)
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(message "Baha'i date: %s"
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(calendar-bahai-date-string (calendar-cursor-to-date t))))
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(defun calendar-goto-bahai-date (date &optional noecho)
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"Move cursor to Baha'i date DATE.
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Echo Baha'i date unless NOECHO is t."
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(interactive (bahai-prompt-for-date))
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(calendar-goto-date (calendar-gregorian-from-absolute
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(calendar-absolute-from-bahai date)))
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(or noecho (calendar-print-bahai-date)))
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(defun bahai-prompt-for-date ()
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"Ask for a Baha'i date."
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(let* ((today (calendar-current-date))
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(year (calendar-read
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"Baha'i calendar year (not 0): "
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'(lambda (x) (/= x 0))
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(int-to-string
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(extract-calendar-year
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(calendar-bahai-from-absolute
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(calendar-absolute-from-gregorian today))))))
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(completion-ignore-case t)
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(month (cdr (assoc
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(completing-read
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"Baha'i calendar month name: "
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(mapcar 'list
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(append bahai-calendar-month-name-array nil))
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nil t)
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(calendar-make-alist bahai-calendar-month-name-array
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1))))
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(day (calendar-read "Baha'i calendar day (1-19): "
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'(lambda (x) (and (< 0 x) (<= x 19))))))
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(list (list month day year))))
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(defun diary-bahai-date ()
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"Baha'i calendar equivalent of date diary entry."
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(format "Baha'i date: %s" (calendar-bahai-date-string date)))
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(defun holiday-bahai (month day string)
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"Holiday on MONTH, DAY (Baha'i) called STRING.
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If MONTH, DAY (Baha'i) is visible, the value returned is corresponding
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Gregorian date in the form of the list (((month day year) STRING)). Returns
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nil if it is not visible in the current calendar window."
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(let* ((bahai-date (calendar-bahai-from-absolute
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(calendar-absolute-from-gregorian
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(list displayed-month 15 displayed-year))))
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(m (extract-calendar-month bahai-date))
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(y (extract-calendar-year bahai-date))
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(date))
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(if (< m 1)
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nil ;; Baha'i calendar doesn't apply.
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(increment-calendar-month m y (- 10 month))
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(if (> m 7) ;; Baha'i date might be visible
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(let ((date (calendar-gregorian-from-absolute
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(calendar-absolute-from-bahai (list month day y)))))
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(if (calendar-date-is-visible-p date)
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(list (list date string))))))))
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(defun list-bahai-diary-entries ()
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"Add any Baha'i date entries from the diary file to `diary-entries-list'.
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Baha'i date diary entries must be prefaced by an
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`bahai-diary-entry-symbol' (normally a `B'). The same diary date
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forms govern the style of the Baha'i calendar entries, except that the
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Baha'i month names must be given numerically. The Baha'i months are
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numbered from 1 to 19 with Baha being 1 and 19 being `Ala. If a
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Baha'i date diary entry begins with a `diary-nonmarking-symbol', the
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entry will appear in the diary listing, but will not be marked in the
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calendar. This function is provided for use with the
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`nongregorian-diary-listing-hook'."
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(if (< 0 number)
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(let ((buffer-read-only nil)
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(diary-modified (buffer-modified-p))
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(gdate original-date)
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(mark (regexp-quote diary-nonmarking-symbol)))
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(calendar-for-loop i from 1 to number do
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(let* ((d diary-date-forms)
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(bdate (calendar-bahai-from-absolute
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(calendar-absolute-from-gregorian gdate)))
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(month (extract-calendar-month bdate))
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(day (extract-calendar-day bdate))
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(year (extract-calendar-year bdate)))
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(while d
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(let*
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((date-form (if (equal (car (car d)) 'backup)
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(cdr (car d))
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(car d)))
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(backup (equal (car (car d)) 'backup))
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(dayname
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(concat
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(calendar-day-name gdate) "\\|"
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(substring (calendar-day-name gdate) 0 3) ".?"))
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(calendar-month-name-array
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bahai-calendar-month-name-array)
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(monthname
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(concat
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"\\*\\|"
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(calendar-month-name month)))
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(month (concat "\\*\\|0*" (int-to-string month)))
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(day (concat "\\*\\|0*" (int-to-string day)))
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(year
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(concat
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"\\*\\|0*" (int-to-string year)
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(if abbreviated-calendar-year
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(concat "\\|" (int-to-string (% year 100)))
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"")))
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(regexp
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(concat
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"\\(\\`\\|\^M\\|\n\\)" mark "?"
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(regexp-quote bahai-diary-entry-symbol)
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"\\("
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(mapconcat 'eval date-form "\\)\\(")
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"\\)"))
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(case-fold-search t))
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(goto-char (point-min))
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(while (re-search-forward regexp nil t)
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(if backup (re-search-backward "\\<" nil t))
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(if (and (or (char-equal (preceding-char) ?\^M)
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(char-equal (preceding-char) ?\n))
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(not (looking-at " \\|\^I")))
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;; Diary entry that consists only of date.
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(backward-char 1)
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;; Found a nonempty diary entry--make it visible and
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;; add it to the list.
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(let ((entry-start (point))
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(date-start))
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(re-search-backward "\^M\\|\n\\|\\`")
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(setq date-start (point))
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(re-search-forward "\^M\\|\n" nil t 2)
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(while (looking-at " \\|\^I")
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(re-search-forward "\^M\\|\n" nil t))
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(backward-char 1)
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(subst-char-in-region date-start (point) ?\^M ?\n t)
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(add-to-diary-list
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gdate
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(buffer-substring-no-properties entry-start (point))
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(buffer-substring-no-properties
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(1+ date-start) (1- entry-start)))))))
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(setq d (cdr d))))
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(setq gdate
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(calendar-gregorian-from-absolute
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(1+ (calendar-absolute-from-gregorian gdate)))))
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(set-buffer-modified-p diary-modified))
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(goto-char (point-min))))
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(defun mark-bahai-diary-entries ()
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"Mark days in the calendar window that have Baha'i date diary entries.
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Each entry in diary-file (or included files) visible in the calendar
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window is marked. Baha'i date entries are prefaced by a
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bahai-diary-entry-symbol \(normally a B`I'). The same
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diary-date-forms govern the style of the Baha'i calendar entries,
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except that the Baha'i month names must be spelled in full. The
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Baha'i months are numbered from 1 to 12 with Baha being 1 and 12 being
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`Ala. Baha'i date diary entries that begin with a
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diary-nonmarking-symbol will not be marked in the calendar. This
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function is provided for use as part of the
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nongregorian-diary-marking-hook."
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(let ((d diary-date-forms))
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(while d
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(let*
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((date-form (if (equal (car (car d)) 'backup)
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(cdr (car d))
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(car d)));; ignore 'backup directive
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(dayname (diary-name-pattern calendar-day-name-array))
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(monthname
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(concat
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(diary-name-pattern bahai-calendar-month-name-array t)
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"\\|\\*"))
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(month "[0-9]+\\|\\*")
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(day "[0-9]+\\|\\*")
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(year "[0-9]+\\|\\*")
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(l (length date-form))
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(d-name-pos (- l (length (memq 'dayname date-form))))
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(d-name-pos (if (/= l d-name-pos) (+ 2 d-name-pos)))
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(m-name-pos (- l (length (memq 'monthname date-form))))
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(m-name-pos (if (/= l m-name-pos) (+ 2 m-name-pos)))
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(d-pos (- l (length (memq 'day date-form))))
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(d-pos (if (/= l d-pos) (+ 2 d-pos)))
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(m-pos (- l (length (memq 'month date-form))))
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(m-pos (if (/= l m-pos) (+ 2 m-pos)))
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(y-pos (- l (length (memq 'year date-form))))
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(y-pos (if (/= l y-pos) (+ 2 y-pos)))
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(regexp
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(concat
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"\\(\\`\\|\^M\\|\n\\)"
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(regexp-quote bahai-diary-entry-symbol)
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"\\("
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(mapconcat 'eval date-form "\\)\\(")
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"\\)"))
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(case-fold-search t))
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(goto-char (point-min))
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(while (re-search-forward regexp nil t)
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(let* ((dd-name
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(if d-name-pos
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(buffer-substring
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(match-beginning d-name-pos)
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(match-end d-name-pos))))
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(mm-name
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(if m-name-pos
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(buffer-substring
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(match-beginning m-name-pos)
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(match-end m-name-pos))))
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(mm (string-to-int
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(if m-pos
|
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(buffer-substring
|
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(match-beginning m-pos)
|
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(match-end m-pos))
|
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"")))
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(dd (string-to-int
|
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(if d-pos
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(buffer-substring
|
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(match-beginning d-pos)
|
||||
(match-end d-pos))
|
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"")))
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(y-str (if y-pos
|
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(buffer-substring
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||||
(match-beginning y-pos)
|
||||
(match-end y-pos))))
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(yy (if (not y-str)
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0
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(if (and (= (length y-str) 2)
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abbreviated-calendar-year)
|
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(let* ((current-y
|
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(extract-calendar-year
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(calendar-bahai-from-absolute
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(calendar-absolute-from-gregorian
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(calendar-current-date)))))
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(y (+ (string-to-int y-str)
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(* 100 (/ current-y 100)))))
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(if (> (- y current-y) 50)
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(- y 100)
|
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(if (> (- current-y y) 50)
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(+ y 100)
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y)))
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||||
(string-to-int y-str)))))
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(if dd-name
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(mark-calendar-days-named
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(cdr (assoc-ignore-case (substring dd-name 0 3)
|
||||
(calendar-make-alist
|
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calendar-day-name-array
|
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0
|
||||
'(lambda (x) (substring x 0 3))))))
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(if mm-name
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(if (string-equal mm-name "*")
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(setq mm 0)
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(setq mm
|
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(cdr (assoc-ignore-case
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mm-name
|
||||
(calendar-make-alist
|
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bahai-calendar-month-name-array))))))
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(mark-bahai-calendar-date-pattern mm dd yy)))))
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(setq d (cdr d)))))
|
||||
|
||||
(defun mark-bahai-calendar-date-pattern (month day year)
|
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"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
|
||||
Loading…
Add table
Add a link
Reference in a new issue