Commit 0808d911 authored by Edward M. Reingold's avatar Edward M. Reingold

Initial revision

parent 5c19bda9
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;;; cal-coptic.el --- calendar functions for the Coptic/Ethiopic calendars.
;; Copyright (C) 1995 Free Software Foundation, Inc.
;; Author: Edward M. Reingold <reingold@cs.uiuc.edu>
;; Keywords: calendar
;; Human-Keywords: Coptic calendar, Ethiopic calendar, 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, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
;; This collection of functions implements the features of calendar.el and
;; diary.el that deal with the Coptic and Ethiopic calendars.
;; Comments, corrections, and improvements should be sent to
;; Edward M. Reingold Department of Computer Science
;; (217) 333-6733 University of Illinois at Urbana-Champaign
;; reingold@cs.uiuc.edu 1304 West Springfield Avenue
;; Urbana, Illinois 61801
;;; Code:
(require 'cal-julian)
(defvar coptic-calendar-month-name-array
["Tot" "Babe" "Hatur" "Kihak" "Tube" "Amshir" "Baramhat" "Barmuda"
"Bashnas" "Bauna" "Abib" "Misra" "Nisi"])
(defvar coptic-calendar-epoch (calendar-absolute-from-julian '(8 29 284))
"Absolute date of start of Coptic calendar = August 29, 284 A.D. (Julian).")
(defconst coptic-name "Coptic")
(defun coptic-calendar-leap-year-p (year)
"True if YEAR is a leap year on the Coptic calendar."
(zerop (mod (1+ year) 4)))
(defun coptic-calendar-last-day-of-month (month year)
"Return last day of MONTH, YEAR on the Coptic calendar.
The 13th month is not really a month, but the 5 (6 in leap years) day period of
Nisi (Kebus) at the end of the year."
(if (< month 13)
30
(if (coptic-calendar-leap-year-p year)
6
5)))
(defun calendar-absolute-from-coptic (date)
"Compute absolute date from Coptic 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)))
(+ (1- coptic-calendar-epoch);; Days before start of calendar
(* 365 (1- year)) ;; Days in prior years
(/ year 4) ;; Leap days in prior years
(* 30 (1- month)) ;; Days in prior months this year
day))) ;; Days so far this month
(defun calendar-coptic-from-absolute (date)
"Compute the Coptic equivalent for absolute date DATE.
The result is a list of the form (MONTH DAY YEAR).
The absolute date is the number of days elapsed since the imaginary
Gregorian date Sunday, December 31, 1 BC."
(if (< date coptic-calendar-epoch)
(list 0 0 0);; pre-Coptic date
(let* ((approx (/ (- date coptic-calendar-epoch)
366)) ;; Approximation from below.
(year ;; Search forward from the approximation.
(+ approx
(calendar-sum y approx
(>= date (calendar-absolute-from-coptic (list 1 1 (1+ y))))
1)))
(month ;; Search forward from Tot.
(1+ (calendar-sum m 1
(> date
(calendar-absolute-from-coptic
(list m
(coptic-calendar-last-day-of-month m year)
year)))
1)))
(day ;; Calculate the day by subtraction.
(- date
(1- (calendar-absolute-from-coptic (list month 1 year))))))
(list month day year))))
(defun calendar-coptic-date-string (&optional date)
"String of Coptic date of Gregorian DATE.
Returns the empty string if DATE is pre-Coptic calendar.
Defaults to today's date if DATE is not given."
(let* ((coptic-date (calendar-coptic-from-absolute
(calendar-absolute-from-gregorian
(or date (calendar-current-date)))))
(y (extract-calendar-year coptic-date))
(m (extract-calendar-month coptic-date)))
(if (< y 1)
""
(let ((monthname (aref coptic-calendar-month-name-array (1- m)))
(day (int-to-string (extract-calendar-day coptic-date)))
(dayname nil)
(month (int-to-string m))
(year (int-to-string y)))
(mapconcat 'eval calendar-date-display-form "")))))
(defun calendar-print-coptic-date ()
"Show the Coptic calendar equivalent of the selected date."
(interactive)
(let ((f (calendar-coptic-date-string (calendar-cursor-to-date t))))
(if (string-equal f "")
(message "Date is pre-%s calendar" coptic-name)
(message f))))
(defun calendar-goto-coptic-date (date &optional noecho)
"Move cursor to Coptic date DATE.
Echo Coptic date unless NOECHO is t."
(interactive (coptic-prompt-for-date))
(calendar-goto-date (calendar-gregorian-from-absolute
(calendar-absolute-from-coptic date)))
(or noecho (calendar-print-coptic-date)))
(defun coptic-prompt-for-date ()
"Ask for a Coptic date."
(let* ((today (calendar-current-date))
(year (calendar-read
(format "%s calendar year (>0): " coptic-name)
'(lambda (x) (> x 0))
(int-to-string
(extract-calendar-year
(calendar-coptic-from-absolute
(calendar-absolute-from-gregorian today))))))
(completion-ignore-case t)
(month (cdr (assoc
(capitalize
(completing-read
(format "%s calendar month name: " coptic-name)
(mapcar 'list
(append coptic-calendar-month-name-array nil))
nil t))
(calendar-make-alist coptic-calendar-month-name-array
1 'capitalize))))
(last (coptic-calendar-last-day-of-month month year))
(day (calendar-read
(format "%s calendar day (1-%d): " coptic-name last)
'(lambda (x) (and (< 0 x) (<= x last))))))
(list (list month day year))))
(defun diary-coptic-date ()
"Coptic calendar equivalent of date diary entry."
(let ((f (calendar-coptic-date-string (calendar-cursor-to-date t))))
(if (string-equal f "")
(format "Date is pre-%s calendar" coptic-name)
f)))
(defconst ethiopic-calendar-month-name-array
["Maskarram" "Tekemt" "Hadar" "Tahsas" "Tarr" "Yekatit" "Magawit" "Miaziah"
"Genbot" "Sanni" "Hamle" "Nas'hi" "Pagnem"])
(defconst ethiopic-calendar-epoch (calendar-absolute-from-julian '(8 29 7))
"Absolute date of start of Ethiopic calendar = August 29, 7 A.D. (Julian).")
(defconst ethiopic-name "Ethiopic")
(defun calendar-absolute-from-ethiopic (date)
"Compute absolute date from Ethiopic date DATE.
The absolute date is the number of days elapsed since the (imaginary)
Gregorian date Sunday, December 31, 1 BC."
(let ((coptic-calendar-epoch ethiopic-calendar-epoch))
(calendar-absolute-from-coptic date)))
(defun calendar-ethiopic-from-absolute (date)
"Compute the Ethiopic equivalent for absolute date DATE.
The result is a list of the form (MONTH DAY YEAR).
The absolute date is the number of days elapsed since the imaginary
Gregorian date Sunday, December 31, 1 BC."
(let ((coptic-calendar-epoch ethiopic-calendar-epoch))
(calendar-coptic-from-absolute date)))
(defun calendar-ethiopic-date-string (&optional date)
"String of Ethiopic date of Gregorian DATE.
Returns the empty string if DATE is pre-Ethiopic calendar.
Defaults to today's date if DATE is not given."
(let ((coptic-calendar-epoch ethiopic-calendar-epoch)
(coptic-name ethiopic-name)
(coptic-calendar-month-name-array ethiopic-calendar-month-name-array))
(calendar-coptic-date-string date)))
(defun calendar-print-ethiopic-date ()
"Show the Ethiopic calendar equivalent of the selected date."
(interactive)
(let ((coptic-calendar-epoch ethiopic-calendar-epoch)
(coptic-name ethiopic-name)
(coptic-calendar-month-name-array ethiopic-calendar-month-name-array))
(call-interactively 'calendar-print-coptic-date)))
(defun calendar-goto-ethiopic-date (date &optional noecho)
"Move cursor to Ethiopic date DATE.
Echo Ethiopic date unless NOECHO is t."
(interactive
(let ((coptic-calendar-epoch ethiopic-calendar-epoch)
(coptic-name ethiopic-name)
(coptic-calendar-month-name-array ethiopic-calendar-month-name-array))
(coptic-prompt-for-date)))
(calendar-goto-date (calendar-gregorian-from-absolute
(calendar-absolute-from-ethiopic date)))
(or noecho (calendar-print-ethiopic-date)))
(defun diary-ethiopic-date ()
"Ethiopic calendar equivalent of date diary entry."
(let ((coptic-calendar-epoch ethiopic-calendar-epoch)
(coptic-name ethiopic-name)
(coptic-calendar-month-name-array ethiopic-calendar-month-name-array))
(diary-coptic-date)))
(provide 'cal-coptic)
;;; cal-coptic.el ends here
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;;; cal-iso.el --- calendar functions for the ISO calendar.
;; Copyright (C) 1995 Free Software Foundation, Inc.
;; Author: Edward M. Reingold <reingold@cs.uiuc.edu>
;; Keywords: calendar
;; Human-Keywords: ISO calendar, 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, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
;; This collection of functions implements the features of calendar.el and
;; diary.el that deal with the ISO calendar.
;; Comments, corrections, and improvements should be sent to
;; Edward M. Reingold Department of Computer Science
;; (217) 333-6733 University of Illinois at Urbana-Champaign
;; reingold@cs.uiuc.edu 1304 West Springfield Avenue
;; Urbana, Illinois 61801
;;; Code:
(require 'calendar)
(defun calendar-absolute-from-iso (date)
"The number of days elapsed between the Gregorian date 12/31/1 BC and DATE.
The `ISO year' corresponds approximately to the Gregorian year, but
weeks start on Monday and end on Sunday. The first week of the ISO year is
the first such week in which at least 4 days are in a year. The ISO
commercial DATE has the form (week day year) in which week is in the range
1..52 and day is in the range 0..6 (1 = Monday, 2 = Tuesday, ..., 0 =
Sunday). The Gregorian date Sunday, December 31, 1 BC is imaginary."
(let* ((week (extract-calendar-month date))
(day (extract-calendar-day date))
(year (extract-calendar-year date)))
(+ (calendar-dayname-on-or-before
1 (+ 3 (calendar-absolute-from-gregorian (list 1 1 year))))
(* 7 (1- week))
(if (= day 0) 6 (1- day)))))
(defun calendar-iso-from-absolute (date)
"Compute the `ISO commercial date' corresponding to the absolute DATE.
The ISO year corresponds approximately to the Gregorian year, but weeks
start on Monday and end on Sunday. The first week of the ISO year is the
first such week in which at least 4 days are in a year. The ISO commercial
date has the form (week day year) in which week is in the range 1..52 and
day is in the range 0..6 (1 = Monday, 2 = Tuesday, ..., 0 = Sunday). The
absolute date is the number of days elapsed since the (imaginary) Gregorian
date Sunday, December 31, 1 BC."
(let* ((approx (extract-calendar-year
(calendar-gregorian-from-absolute (- date 3))))
(year (+ approx
(calendar-sum y approx
(>= date (calendar-absolute-from-iso (list 1 1 (1+ y))))
1))))
(list
(1+ (/ (- date (calendar-absolute-from-iso (list 1 1 year))) 7))
(% date 7)
year)))
(defun calendar-iso-date-string (&optional date)
"String of ISO date of Gregorian DATE.
Defaults to today's date if DATE is not given."
(let* ((d (calendar-absolute-from-gregorian
(or date (calendar-current-date))))
(day (% d 7))
(iso-date (calendar-iso-from-absolute d)))
(format "Day %s of week %d of %d"
(if (zerop day) 7 day)
(extract-calendar-month iso-date)
(extract-calendar-year iso-date))))
(defun calendar-print-iso-date ()
"Show equivalent ISO date for the date under the cursor."
(interactive)
(message "ISO date: %s"
(calendar-iso-date-string (calendar-cursor-to-date t))))
(defun calendar-goto-iso-date (date &optional noecho)
"Move cursor to ISO DATE; echo ISO date unless NOECHO is t."
(interactive
(let* ((today (calendar-current-date))
(year (calendar-read
"ISO calendar year (>0): "
'(lambda (x) (> x 0))
(int-to-string (extract-calendar-year today))))
(no-weeks (extract-calendar-month
(calendar-iso-from-absolute
(1-
(calendar-dayname-on-or-before
1 (calendar-absolute-from-gregorian
(list 1 4 (1+ year))))))))
(week (calendar-read
(format "ISO calendar week (1-%d): " no-weeks)
'(lambda (x) (and (> x 0) (<= x no-weeks)))))
(day (calendar-read
"ISO day (1-7): "
'(lambda (x) (and (<= 1 x) (<= x 7))))))
(list (list week day year))))
(calendar-goto-date (calendar-gregorian-from-absolute
(calendar-absolute-from-iso date)))
(or noecho (calendar-print-iso-date)))
(defun diary-iso-date ()
"ISO calendar equivalent of date diary entry."
(format "ISO date: %s" (calendar-iso-date-string date)))
(provide 'cal-iso)
;;; cal-iso.el ends here
;;; cal-julian.el --- calendar functions for the Julian calendar.
;; Copyright (C) 1995 Free Software Foundation, Inc.
;; Author: Edward M. Reingold <reingold@cs.uiuc.edu>
;; Keywords: calendar
;; Human-Keywords: Julian calendar, Julian day number, 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, 675 Mass Ave, Cambridge, MA 02139, USA.
;;; Commentary:
;; This collection of functions implements the features of calendar.el and
;; diary.el that deal with the Julian calendar.
;; Comments, corrections, and improvements should be sent to
;; Edward M. Reingold Department of Computer Science
;; (217) 333-6733 University of Illinois at Urbana-Champaign
;; reingold@cs.uiuc.edu 1304 West Springfield Avenue
;; Urbana, Illinois 61801
;;; Code:
(require 'calendar)
(defun calendar-julian-from-absolute (date)
"Compute the Julian (month day year) corresponding to the absolute DATE.
The absolute date is the number of days elapsed since the (imaginary)
Gregorian date Sunday, December 31, 1 BC."
(let* ((approx (/ (+ date 2) 366));; Approximation from below.
(year ;; Search forward from the approximation.
(+ approx
(calendar-sum y approx
(>= date (calendar-absolute-from-julian (list 1 1 (1+ y))))
1)))
(month ;; Search forward from January.
(1+ (calendar-sum m 1
(> date
(calendar-absolute-from-julian
(list m
(if (and (= m 2) (= (% year 4) 0))
29
(aref [31 28 31 30 31 30 31 31 30 31 30 31]
(1- m)))
year)))
1)))
(day ;; Calculate the day by subtraction.
(- date (1- (calendar-absolute-from-julian (list month 1 year))))))
(list month day year)))
(defun calendar-absolute-from-julian (date)
"The number of days elapsed between the Gregorian date 12/31/1 BC and DATE.
The Gregorian date Sunday, December 31, 1 BC is imaginary."
(let ((month (extract-calendar-month date))
(day (extract-calendar-day date))
(year (extract-calendar-year date)))
(+ (calendar-day-number date)
(if (and (= (% year 100) 0)
(/= (% year 400) 0)
(> month 2))
1 0);; Correct for Julian but not Gregorian leap year.
(* 365 (1- year))
(/ (1- year) 4)
-2)))
(defun calendar-julian-date-string (&optional date)
"String of Julian date of Gregorian DATE.
Defaults to today's date if DATE is not given.
Driven by the variable `calendar-date-display-form'."
(calendar-date-string
(calendar-julian-from-absolute
(calendar-absolute-from-gregorian
(or date (calendar-current-date))))
nil t))
(defun calendar-print-julian-date ()
"Show the Julian calendar equivalent of the date under the cursor."
(interactive)
(message "Julian date: %s"
(calendar-julian-date-string (calendar-cursor-to-date t))))
(defun calendar-goto-julian-date (date &optional noecho)
"Move cursor to Julian DATE; echo Julian date unless NOECHO is t."
(interactive
(let* ((today (calendar-current-date))
(year (calendar-read
"Julian calendar year (>0): "
'(lambda (x) (> x 0))
(int-to-string
(extract-calendar-year
(calendar-julian-from-absolute
(calendar-absolute-from-gregorian
today))))))
(month-array calendar-month-name-array)
(completion-ignore-case t)
(month (cdr (assoc
(capitalize
(completing-read
"Julian calendar month name: "
(mapcar 'list (append month-array nil))
nil t))
(calendar-make-alist month-array 1 'capitalize))))
(last
(if (and (zerop (% year 4)) (= month 2))
29
(aref [31 28 31 30 31 30 31 31 30 31 30 31] (1- month))))
(day (calendar-read
(format "Julian calendar day (%d-%d): "
(if (and (= year 1) (= month 1)) 3 1) last)
'(lambda (x)
(and (< (if (and (= year 1) (= month 1)) 2 0) x)
(<= x last))))))
(list (list month day year))))
(calendar-goto-date (calendar-gregorian-from-absolute
(calendar-absolute-from-julian date)))
(or noecho (calendar-print-julian-date)))
(defun holiday-julian (month day string)
"Holiday on MONTH, DAY (Julian) called STRING.
If MONTH, DAY (Julian) 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 ((m1 displayed-month)
(y1 displayed-year)
(m2 displayed-month)
(y2 displayed-year)
(year))
(increment-calendar-month m1 y1 -1)
(increment-calendar-month m2 y2 1)
(let* ((start-date (calendar-absolute-from-gregorian
(list m1 1 y1)))
(end-date (calendar-absolute-from-gregorian
(list m2 (calendar-last-day-of-month m2 y2) y2)))
(julian-start (calendar-julian-from-absolute start-date))
(julian-end (calendar-julian-from-absolute end-date))
(julian-y1 (extract-calendar-year julian-start))
(julian-y2 (extract-calendar-year julian-end)))
(setq year (if (< 10 month) julian-y1 julian-y2))
(let ((date (calendar-gregorian-from-absolute
(calendar-absolute-from-julian
(list month day year)))))
(if (calendar-date-is-visible-p date)
(list (list date string)))))))
(defun diary-julian-date ()
"Julian calendar equivalent of date diary entry."
(format "Julian date: %s" (calendar-julian-date-string date)))
(defun calendar-absolute-from-astro (d)
"Absolute date of astronical (Julian) day number D."
(- d 1721424.5))
(defun calendar-astro-from-absolute (d)
"Astronomical (Julian) day number of absolute date D."
(+ d 1721424.5))
(defun calendar-astro-date-string (&optional date)
"String of astronomical (Julian) day number after noon UTC of Gregorian DATE.
Defaults to today's date if DATE is not given."
(int-to-string
(ceiling
(calendar-astro-from-absolute
(calendar-absolute-from-gregorian
(or date (calendar-current-date)))))))
(defun calendar-print-astro-day-number ()
"Show astronomical (Julian) day number after noon UTC on date shown by cursor."
(interactive)
(message
"Astronomical (Julian) day number (after noon UTC): %s"
(calendar-astro-date-string (calendar-cursor-to-date t))))
(defun calendar-goto-astro-day-number (daynumber &optional noecho)
"Move cursor to astronomical (Julian) DAYNUMBER.
Echo astronomical (Julian) day number unless NOECHO is t."
(interactive (list (calendar-read
"Astronomical (Julian) day number (>1721425): "
'(lambda (x) (> x 1721425)))))
(calendar-goto-date
(calendar-gregorian-from-absolute
(floor
(calendar-absolute-from-astro daynumber))))
(or noecho (calendar-print-astro-day-number)))
(defun diary-astro-day-number ()
"Astronomical (Julian) day number diary entry."
(format "Astronomical (Julian) day number %s"
(calendar-astro-date-string date)))
(provide 'cal-julian)
;;; cal-julian.el ends here
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