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-;;; cal-bahai.el --- calendar functions for the Baha'i calendar.
-
-;; Copyright (C) 2001 Free Software Foundation, Inc.
-
-;; Author: John Wiegley <[email protected]>
-;; 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