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Most of this change is to boilerplate commentary such as license URLs. This change was prompted by ftp://ftp.gnu.org's going-away party, planned for November. Change these FTP URLs to https://ftp.gnu.org instead. Make similar changes for URLs to other organizations moving away from FTP. Also, change HTTP to HTTPS for URLs to gnu.org and fsf.org when this works, as this will further help defend against man-in-the-middle attacks (for this part I omitted the MS-DOS and MS-Windows sources and the test tarballs to keep the workload down). HTTPS is not fully working to lists.gnu.org so I left those URLs alone for now.
251 lines
10 KiB
EmacsLisp
251 lines
10 KiB
EmacsLisp
;;; cal-coptic.el --- calendar functions for the Coptic/Ethiopic calendars
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;; Copyright (C) 1995, 1997, 2001-2017 Free Software Foundation, Inc.
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;; Author: Edward M. Reingold <reingold@cs.uiuc.edu>
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;; Maintainer: Glenn Morris <rgm@gnu.org>
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;; Keywords: calendar
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;; Human-Keywords: Coptic calendar, Ethiopic calendar, calendar, diary
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;; Package: calendar
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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 3 of the License, or
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;; (at your option) 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. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; See calendar.el.
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;;; Code:
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(require 'calendar)
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;; Not constants because they get let-bound.
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(defvar calendar-coptic-month-name-array
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["Tut" "Babah" "Hatur" "Kiyahk" "Tubah" "Amshir" "Baramhat" "Barmundah"
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"Bashans" "Baunah" "Abib" "Misra" "al-Nasi"]
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"Array of the month names in the Coptic calendar.")
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(eval-and-compile
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(autoload 'calendar-julian-to-absolute "cal-julian"))
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(defvar calendar-coptic-epoch
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(eval-when-compile (calendar-julian-to-absolute '(8 29 284)))
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"Absolute date of start of Coptic calendar = August 29, 284 AD (Julian).")
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(defvar calendar-coptic-name "Coptic"
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"Used in some message strings.")
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(defun calendar-coptic-leap-year-p (year)
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"True if YEAR is a leap year on the Coptic calendar."
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(zerop (mod (1+ year) 4)))
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(defun calendar-coptic-last-day-of-month (month year)
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"Return last day of MONTH, YEAR on the Coptic calendar.
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The 13th month is not really a month, but the 5 (6 in leap years) day period of
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Nisi (Kebus) at the end of the year."
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(if (< month 13)
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30
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(if (calendar-coptic-leap-year-p year)
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6
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5)))
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(defun calendar-coptic-to-absolute (date)
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"Compute absolute date from Coptic 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 (calendar-extract-month date))
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(day (calendar-extract-day date))
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(year (calendar-extract-year date)))
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(+ (1- calendar-coptic-epoch) ; days before start of calendar
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(* 365 (1- year)) ; days in prior years
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(/ year 4) ; leap days in prior years
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(* 30 (1- month)) ; days in prior months this year
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day))) ; days so far this month
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(defun calendar-coptic-from-absolute (date)
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"Compute the Coptic equivalent for absolute date DATE.
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The result is a list of the form (MONTH DAY YEAR).
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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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(if (< date calendar-coptic-epoch)
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(list 0 0 0) ; pre-Coptic date
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(let* ((approx (/ (- date calendar-coptic-epoch)
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366)) ; approximation from below
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(year ; search forward from the approximation
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(+ approx
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(calendar-sum y approx
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(>= date (calendar-coptic-to-absolute
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(list 1 1 (1+ y))))
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1)))
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(month ; search forward from Tot
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(1+ (calendar-sum m 1
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(> date
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(calendar-coptic-to-absolute
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(list m
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(calendar-coptic-last-day-of-month m
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year)
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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-coptic-to-absolute (list month 1 year))))))
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(list month day year))))
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;;;###cal-autoload
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(defun calendar-coptic-date-string (&optional date)
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"String of Coptic date of Gregorian DATE.
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Returns the empty string if DATE is pre-Coptic calendar.
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Defaults to today's date if DATE is not given."
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(let* ((coptic-date (calendar-coptic-from-absolute
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(calendar-absolute-from-gregorian
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(or date (calendar-current-date)))))
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(y (calendar-extract-year coptic-date))
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(m (calendar-extract-month coptic-date)))
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(if (< y 1)
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""
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(let ((monthname (aref calendar-coptic-month-name-array (1- m)))
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(day (number-to-string (calendar-extract-day coptic-date)))
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(dayname nil)
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(month (number-to-string m))
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(year (number-to-string y)))
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(mapconcat 'eval calendar-date-display-form "")))))
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;;;###cal-autoload
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(defun calendar-coptic-print-date ()
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"Show the Coptic calendar equivalent of the selected date."
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(interactive)
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(let ((f (calendar-coptic-date-string (calendar-cursor-to-date t))))
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(if (string-equal f "")
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(message "Date is pre-%s calendar" calendar-coptic-name)
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(message "%s date: %s" calendar-coptic-name f))))
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(defun calendar-coptic-read-date ()
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"Interactively read the arguments for a Coptic date command.
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Reads a year, month, and day."
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(let* ((today (calendar-current-date))
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(year (calendar-read
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(format "%s calendar year (>0): " calendar-coptic-name)
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(lambda (x) (> x 0))
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(number-to-string
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(calendar-extract-year
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(calendar-coptic-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-string
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(completing-read
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(format "%s calendar month name: " calendar-coptic-name)
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(mapcar 'list
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(append calendar-coptic-month-name-array nil))
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nil t)
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(calendar-make-alist calendar-coptic-month-name-array
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1) t)))
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(last (calendar-coptic-last-day-of-month month year))
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(day (calendar-read
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(format "%s calendar day (1-%d): " calendar-coptic-name last)
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(lambda (x) (and (< 0 x) (<= x last))))))
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(list (list month day year))))
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;;;###cal-autoload
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(defun calendar-coptic-goto-date (date &optional noecho)
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"Move cursor to Coptic date DATE.
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Echo Coptic date unless NOECHO is t."
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(interactive (calendar-coptic-read-date))
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(calendar-goto-date (calendar-gregorian-from-absolute
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(calendar-coptic-to-absolute date)))
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(or noecho (calendar-coptic-print-date)))
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(defvar date)
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;; To be called from diary-list-sexp-entries, where DATE is bound.
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;;;###diary-autoload
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(defun diary-coptic-date ()
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"Coptic calendar equivalent of date diary entry."
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(let ((f (calendar-coptic-date-string date)))
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(if (string-equal f "")
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(format "Date is pre-%s calendar" calendar-coptic-name)
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(format "%s date: %s" calendar-coptic-name f))))
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(defconst calendar-ethiopic-month-name-array
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["Maskaram" "Teqemt" "Khedar" "Takhsas" "Ter" "Yakatit" "Magabit" "Miyazya"
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"Genbot" "Sane" "Hamle" "Nahas" "Paguem"]
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"Array of the month names in the Ethiopic calendar.")
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(defconst calendar-ethiopic-epoch 2796
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"Absolute date of start of Ethiopic calendar = August 29, 8 C.E. (Julian).")
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(defconst calendar-ethiopic-name "Ethiopic"
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"Used in some message strings.")
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(defun calendar-ethiopic-to-absolute (date)
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"Compute absolute date from Ethiopic 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 ((calendar-coptic-epoch calendar-ethiopic-epoch))
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(calendar-coptic-to-absolute date)))
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(defun calendar-ethiopic-from-absolute (date)
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"Compute the Ethiopic equivalent for absolute date DATE.
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The result is a list of the form (MONTH DAY YEAR).
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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 ((calendar-coptic-epoch calendar-ethiopic-epoch))
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(calendar-coptic-from-absolute date)))
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;;;###cal-autoload
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(defun calendar-ethiopic-date-string (&optional date)
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"String of Ethiopic date of Gregorian DATE.
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Returns the empty string if DATE is pre-Ethiopic calendar.
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Defaults to today's date if DATE is not given."
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(let ((calendar-coptic-epoch calendar-ethiopic-epoch)
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(calendar-coptic-name calendar-ethiopic-name)
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(calendar-coptic-month-name-array calendar-ethiopic-month-name-array))
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(calendar-coptic-date-string date)))
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;;;###cal-autoload
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(defun calendar-ethiopic-print-date ()
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"Show the Ethiopic calendar equivalent of the selected date."
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(interactive)
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(let ((calendar-coptic-epoch calendar-ethiopic-epoch)
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(calendar-coptic-name calendar-ethiopic-name)
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(calendar-coptic-month-name-array calendar-ethiopic-month-name-array))
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(call-interactively 'calendar-coptic-print-date)))
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;;;###cal-autoload
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(defun calendar-ethiopic-goto-date (date &optional noecho)
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"Move cursor to Ethiopic date DATE.
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Echo Ethiopic date unless NOECHO is t."
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(interactive
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(let ((calendar-coptic-epoch calendar-ethiopic-epoch)
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(calendar-coptic-name calendar-ethiopic-name)
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(calendar-coptic-month-name-array calendar-ethiopic-month-name-array))
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(calendar-coptic-read-date)))
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(calendar-goto-date (calendar-gregorian-from-absolute
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(calendar-ethiopic-to-absolute date)))
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(or noecho (calendar-ethiopic-print-date)))
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;; To be called from diary-list-sexp-entries, where DATE is bound.
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;;;###diary-autoload
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(defun diary-ethiopic-date ()
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"Ethiopic calendar equivalent of date diary entry."
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(let ((calendar-coptic-epoch calendar-ethiopic-epoch)
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(calendar-coptic-name calendar-ethiopic-name)
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(calendar-coptic-month-name-array calendar-ethiopic-month-name-array))
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(diary-coptic-date)))
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(provide 'cal-coptic)
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;;; cal-coptic.el ends here
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