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3afbc435 | 1 | ;;; cal-coptic.el --- calendar functions for the Coptic/Ethiopic calendars |
0808d911 | 2 | |
cc7fff4f GM |
3 | ;; Copyright (C) 1995, 1997, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
4 | ;; 2008 Free Software Foundation, Inc. | |
0808d911 ER |
5 | |
6 | ;; Author: Edward M. Reingold <reingold@cs.uiuc.edu> | |
dbfca9c4 | 7 | ;; Maintainer: Glenn Morris <rgm@gnu.org> |
0808d911 ER |
8 | ;; Keywords: calendar |
9 | ;; Human-Keywords: Coptic calendar, Ethiopic calendar, calendar, diary | |
10 | ||
11 | ;; This file is part of GNU Emacs. | |
12 | ||
13 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
14 | ;; it under the terms of the GNU General Public License as published by | |
075969b4 | 15 | ;; the Free Software Foundation; either version 3, or (at your option) |
0808d911 ER |
16 | ;; any later version. |
17 | ||
18 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
19 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21 | ;; GNU General Public License for more details. | |
22 | ||
23 | ;; You should have received a copy of the GNU General Public License | |
b578f267 | 24 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
3a35cf56 LK |
25 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
26 | ;; Boston, MA 02110-1301, USA. | |
0808d911 ER |
27 | |
28 | ;;; Commentary: | |
29 | ||
b1c57079 | 30 | ;; See calendar.el. |
a96a5fca | 31 | |
0808d911 ER |
32 | ;;; Code: |
33 | ||
dad6b4ee | 34 | (require 'calendar) |
0808d911 | 35 | |
6fd6d1d8 GM |
36 | ;; Not constants because they get let-bound. |
37 | ||
990121a3 | 38 | (defvar calendar-coptic-month-name-array |
179bd1b3 | 39 | ["Tut" "Babah" "Hatur" "Kiyahk" "Tubah" "Amshir" "Baramhat" "Barmundah" |
ef473719 GM |
40 | "Bashans" "Baunah" "Abib" "Misra" "al-Nasi"] |
41 | "Array of the month names in the Coptic calendar.") | |
0808d911 | 42 | |
dad6b4ee | 43 | (eval-and-compile |
5c645a20 | 44 | (autoload 'calendar-julian-to-absolute "cal-julian")) |
dad6b4ee | 45 | |
990121a3 | 46 | (defvar calendar-coptic-epoch |
5c645a20 | 47 | (eval-when-compile (calendar-julian-to-absolute '(8 29 284))) |
cc7fff4f | 48 | "Absolute date of start of Coptic calendar = August 29, 284 AD (Julian).") |
0808d911 | 49 | |
990121a3 | 50 | (defvar calendar-coptic-name "Coptic" |
6fd6d1d8 | 51 | "Used in some message strings.") |
0808d911 | 52 | |
990121a3 | 53 | (defun calendar-coptic-leap-year-p (year) |
0808d911 ER |
54 | "True if YEAR is a leap year on the Coptic calendar." |
55 | (zerop (mod (1+ year) 4))) | |
56 | ||
990121a3 | 57 | (defun calendar-coptic-last-day-of-month (month year) |
0808d911 ER |
58 | "Return last day of MONTH, YEAR on the Coptic calendar. |
59 | The 13th month is not really a month, but the 5 (6 in leap years) day period of | |
d3bdb2a4 | 60 | Nisi (Kebus) at the end of the year." |
0808d911 ER |
61 | (if (< month 13) |
62 | 30 | |
990121a3 | 63 | (if (calendar-coptic-leap-year-p year) |
0808d911 ER |
64 | 6 |
65 | 5))) | |
66 | ||
990121a3 | 67 | (defun calendar-coptic-to-absolute (date) |
0808d911 ER |
68 | "Compute absolute date from Coptic date DATE. |
69 | The absolute date is the number of days elapsed since the (imaginary) | |
70 | Gregorian date Sunday, December 31, 1 BC." | |
e803eab7 GM |
71 | (let ((month (calendar-extract-month date)) |
72 | (day (calendar-extract-day date)) | |
73 | (year (calendar-extract-year date))) | |
990121a3 | 74 | (+ (1- calendar-coptic-epoch) ; days before start of calendar |
ef473719 GM |
75 | (* 365 (1- year)) ; days in prior years |
76 | (/ year 4) ; leap days in prior years | |
77 | (* 30 (1- month)) ; days in prior months this year | |
78 | day))) ; days so far this month | |
0808d911 | 79 | |
990121a3 GM |
80 | (define-obsolete-function-alias 'calendar-absolute-from-coptic |
81 | 'calendar-coptic-to-absolute "23.1") | |
82 | ||
0808d911 ER |
83 | (defun calendar-coptic-from-absolute (date) |
84 | "Compute the Coptic equivalent for absolute date DATE. | |
85 | The result is a list of the form (MONTH DAY YEAR). | |
86 | The absolute date is the number of days elapsed since the imaginary | |
87 | Gregorian date Sunday, December 31, 1 BC." | |
990121a3 | 88 | (if (< date calendar-coptic-epoch) |
d3bdb2a4 | 89 | (list 0 0 0) ; pre-Coptic date |
990121a3 | 90 | (let* ((approx (/ (- date calendar-coptic-epoch) |
ef473719 GM |
91 | 366)) ; approximation from below |
92 | (year ; search forward from the approximation | |
0808d911 ER |
93 | (+ approx |
94 | (calendar-sum y approx | |
990121a3 | 95 | (>= date (calendar-coptic-to-absolute |
ef473719 GM |
96 | (list 1 1 (1+ y)))) |
97 | 1))) | |
d3bdb2a4 | 98 | (month ; search forward from Tot |
0808d911 | 99 | (1+ (calendar-sum m 1 |
ef473719 | 100 | (> date |
990121a3 | 101 | (calendar-coptic-to-absolute |
ef473719 | 102 | (list m |
990121a3 | 103 | (calendar-coptic-last-day-of-month m |
ef473719 GM |
104 | year) |
105 | year))) | |
106 | 1))) | |
d3bdb2a4 | 107 | (day ; calculate the day by subtraction |
0808d911 | 108 | (- date |
990121a3 | 109 | (1- (calendar-coptic-to-absolute (list month 1 year)))))) |
ef473719 | 110 | (list month day year)))) |
0808d911 | 111 | |
1d0c7fdf | 112 | ;;;###cal-autoload |
0808d911 ER |
113 | (defun calendar-coptic-date-string (&optional date) |
114 | "String of Coptic date of Gregorian DATE. | |
115 | Returns the empty string if DATE is pre-Coptic calendar. | |
116 | Defaults to today's date if DATE is not given." | |
117 | (let* ((coptic-date (calendar-coptic-from-absolute | |
118 | (calendar-absolute-from-gregorian | |
119 | (or date (calendar-current-date))))) | |
e803eab7 GM |
120 | (y (calendar-extract-year coptic-date)) |
121 | (m (calendar-extract-month coptic-date))) | |
0808d911 ER |
122 | (if (< y 1) |
123 | "" | |
990121a3 | 124 | (let ((monthname (aref calendar-coptic-month-name-array (1- m))) |
e803eab7 | 125 | (day (int-to-string (calendar-extract-day coptic-date))) |
0808d911 ER |
126 | (dayname nil) |
127 | (month (int-to-string m)) | |
128 | (year (int-to-string y))) | |
129 | (mapconcat 'eval calendar-date-display-form ""))))) | |
130 | ||
1d0c7fdf | 131 | ;;;###cal-autoload |
990121a3 | 132 | (defun calendar-coptic-print-date () |
0808d911 ER |
133 | "Show the Coptic calendar equivalent of the selected date." |
134 | (interactive) | |
135 | (let ((f (calendar-coptic-date-string (calendar-cursor-to-date t)))) | |
136 | (if (string-equal f "") | |
990121a3 GM |
137 | (message "Date is pre-%s calendar" calendar-coptic-name) |
138 | (message "%s date: %s" calendar-coptic-name f)))) | |
139 | ||
140 | (define-obsolete-function-alias 'calendar-print-coptic-date | |
141 | 'calendar-coptic-print-date "23.1") | |
0808d911 | 142 | |
af795681 GM |
143 | (defun calendar-coptic-read-date () |
144 | "Interactively read the arguments for a Coptic date command. | |
145 | Reads a year, month, and day." | |
0808d911 ER |
146 | (let* ((today (calendar-current-date)) |
147 | (year (calendar-read | |
990121a3 | 148 | (format "%s calendar year (>0): " calendar-coptic-name) |
2c47d99f | 149 | (lambda (x) (> x 0)) |
0808d911 | 150 | (int-to-string |
e803eab7 | 151 | (calendar-extract-year |
0808d911 ER |
152 | (calendar-coptic-from-absolute |
153 | (calendar-absolute-from-gregorian today)))))) | |
154 | (completion-ignore-case t) | |
3be2dc28 | 155 | (month (cdr (assoc-string |
50830fad | 156 | (completing-read |
990121a3 | 157 | (format "%s calendar month name: " calendar-coptic-name) |
50830fad | 158 | (mapcar 'list |
990121a3 | 159 | (append calendar-coptic-month-name-array nil)) |
50830fad | 160 | nil t) |
990121a3 | 161 | (calendar-make-alist calendar-coptic-month-name-array |
3be2dc28 | 162 | 1) t))) |
990121a3 | 163 | (last (calendar-coptic-last-day-of-month month year)) |
0808d911 | 164 | (day (calendar-read |
990121a3 | 165 | (format "%s calendar day (1-%d): " calendar-coptic-name last) |
2c47d99f | 166 | (lambda (x) (and (< 0 x) (<= x last)))))) |
0808d911 ER |
167 | (list (list month day year)))) |
168 | ||
990121a3 GM |
169 | (define-obsolete-function-alias 'coptic-prompt-for-date |
170 | 'calendar-coptic-read-date "23.1") | |
af795681 | 171 | |
ef473719 | 172 | ;;;###cal-autoload |
990121a3 | 173 | (defun calendar-coptic-goto-date (date &optional noecho) |
ef473719 GM |
174 | "Move cursor to Coptic date DATE. |
175 | Echo Coptic date unless NOECHO is t." | |
af795681 | 176 | (interactive (calendar-coptic-read-date)) |
ef473719 | 177 | (calendar-goto-date (calendar-gregorian-from-absolute |
990121a3 GM |
178 | (calendar-coptic-to-absolute date))) |
179 | (or noecho (calendar-coptic-print-date))) | |
180 | ||
181 | (define-obsolete-function-alias 'calendar-goto-coptic-date | |
182 | 'calendar-coptic-goto-date "23.1") | |
ef473719 | 183 | |
4692b6a0 GM |
184 | (defvar date) |
185 | ||
8c34d83e | 186 | ;; To be called from diary-list-sexp-entries, where DATE is bound. |
1d0c7fdf | 187 | ;;;###diary-autoload |
0808d911 ER |
188 | (defun diary-coptic-date () |
189 | "Coptic calendar equivalent of date diary entry." | |
7801463c | 190 | (let ((f (calendar-coptic-date-string date))) |
0808d911 | 191 | (if (string-equal f "") |
990121a3 GM |
192 | (format "Date is pre-%s calendar" calendar-coptic-name) |
193 | (format "%s date: %s" calendar-coptic-name f)))) | |
0808d911 | 194 | |
990121a3 | 195 | (defconst calendar-ethiopic-month-name-array |
179bd1b3 | 196 | ["Maskaram" "Teqemt" "Khedar" "Takhsas" "Ter" "Yakatit" "Magabit" "Miyazya" |
ef473719 GM |
197 | "Genbot" "Sane" "Hamle" "Nahas" "Paguem"] |
198 | "Array of the month names in the Ethiopic calendar.") | |
0808d911 | 199 | |
990121a3 | 200 | (defconst calendar-ethiopic-epoch 2796 |
d5824b35 | 201 | "Absolute date of start of Ethiopic calendar = August 29, 8 C.E. (Julian).") |
0808d911 | 202 | |
990121a3 | 203 | (defconst calendar-ethiopic-name "Ethiopic" |
ef473719 | 204 | "Used in some message strings.") |
0808d911 | 205 | |
990121a3 | 206 | (defun calendar-ethiopic-to-absolute (date) |
0808d911 ER |
207 | "Compute absolute date from Ethiopic date DATE. |
208 | The absolute date is the number of days elapsed since the (imaginary) | |
209 | Gregorian date Sunday, December 31, 1 BC." | |
990121a3 GM |
210 | (let ((calendar-coptic-epoch calendar-ethiopic-epoch)) |
211 | (calendar-coptic-to-absolute date))) | |
212 | ||
213 | (define-obsolete-function-alias 'calendar-absolute-from-ethiopic | |
214 | 'calendar-ethiopic-to-absolute "23.1") | |
0808d911 ER |
215 | |
216 | (defun calendar-ethiopic-from-absolute (date) | |
217 | "Compute the Ethiopic equivalent for absolute date DATE. | |
218 | The result is a list of the form (MONTH DAY YEAR). | |
219 | The absolute date is the number of days elapsed since the imaginary | |
220 | Gregorian date Sunday, December 31, 1 BC." | |
990121a3 | 221 | (let ((calendar-coptic-epoch calendar-ethiopic-epoch)) |
0808d911 ER |
222 | (calendar-coptic-from-absolute date))) |
223 | ||
1d0c7fdf | 224 | ;;;###cal-autoload |
0808d911 ER |
225 | (defun calendar-ethiopic-date-string (&optional date) |
226 | "String of Ethiopic date of Gregorian DATE. | |
227 | Returns the empty string if DATE is pre-Ethiopic calendar. | |
228 | Defaults to today's date if DATE is not given." | |
990121a3 GM |
229 | (let ((calendar-coptic-epoch calendar-ethiopic-epoch) |
230 | (calendar-coptic-name calendar-ethiopic-name) | |
231 | (calendar-coptic-month-name-array calendar-ethiopic-month-name-array)) | |
0808d911 ER |
232 | (calendar-coptic-date-string date))) |
233 | ||
1d0c7fdf | 234 | ;;;###cal-autoload |
990121a3 | 235 | (defun calendar-ethiopic-print-date () |
0808d911 ER |
236 | "Show the Ethiopic calendar equivalent of the selected date." |
237 | (interactive) | |
990121a3 GM |
238 | (let ((calendar-coptic-epoch calendar-ethiopic-epoch) |
239 | (calendar-coptic-name calendar-ethiopic-name) | |
240 | (calendar-coptic-month-name-array calendar-ethiopic-month-name-array)) | |
241 | (call-interactively 'calendar-coptic-print-date))) | |
242 | ||
243 | (define-obsolete-function-alias 'calendar-print-ethiopic-date | |
244 | 'calendar-ethiopic-print-date "23.1") | |
0808d911 | 245 | |
1d0c7fdf | 246 | ;;;###cal-autoload |
990121a3 | 247 | (defun calendar-ethiopic-goto-date (date &optional noecho) |
0808d911 ER |
248 | "Move cursor to Ethiopic date DATE. |
249 | Echo Ethiopic date unless NOECHO is t." | |
250 | (interactive | |
990121a3 GM |
251 | (let ((calendar-coptic-epoch calendar-ethiopic-epoch) |
252 | (calendar-coptic-name calendar-ethiopic-name) | |
253 | (calendar-coptic-month-name-array calendar-ethiopic-month-name-array)) | |
af795681 | 254 | (calendar-coptic-read-date))) |
0808d911 | 255 | (calendar-goto-date (calendar-gregorian-from-absolute |
990121a3 GM |
256 | (calendar-ethiopic-to-absolute date))) |
257 | (or noecho (calendar-ethiopic-print-date))) | |
258 | ||
259 | (define-obsolete-function-alias 'calendar-goto-ethiopic-date | |
260 | 'calendar-ethiopic-goto-date "23.1") | |
0808d911 | 261 | |
8c34d83e | 262 | ;; To be called from diary-list-sexp-entries, where DATE is bound. |
1d0c7fdf | 263 | ;;;###diary-autoload |
0808d911 ER |
264 | (defun diary-ethiopic-date () |
265 | "Ethiopic calendar equivalent of date diary entry." | |
990121a3 GM |
266 | (let ((calendar-coptic-epoch calendar-ethiopic-epoch) |
267 | (calendar-coptic-name calendar-ethiopic-name) | |
268 | (calendar-coptic-month-name-array calendar-ethiopic-month-name-array)) | |
0808d911 ER |
269 | (diary-coptic-date))) |
270 | ||
271 | (provide 'cal-coptic) | |
272 | ||
2c47d99f | 273 | ;; arch-tag: 72d49161-25df-4072-9312-b182cdca7627 |
0808d911 | 274 | ;;; cal-coptic.el ends here |