-;;; cal-china.el --- calendar functions for the Chinese calendar
-
-;; Copyright (C) 1995, 1997, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
-;; Free Software Foundation, Inc.
-
-;; Author: Edward M. Reingold <reingold@cs.uiuc.edu>
-;; Maintainer: Glenn Morris <rgm@gnu.org>
-;; Keywords: calendar
-;; Human-Keywords: Chinese calendar, calendar, holidays, 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 3, 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., 51 Franklin Street, Fifth Floor,
-;; Boston, MA 02110-1301, USA.
-
-;;; Commentary:
-
-;; This collection of functions implements the features of calendar.el,
-;; diary.el, and holidays.el that deal with the Chinese calendar. The rules
-;; used for the Chinese calendar are those of Baolin Liu (see L. E. Doggett's
-;; article "Calendars" in the Explanatory Supplement to the Astronomical
-;; Almanac, second edition, 1992) for the calendar as revised at the beginning
-;; of the Qing dynasty in 1644. The nature of the astronomical calculations
-;; is such that precise calculations cannot be made without great expense in
-;; time, so that the calendars produced may not agree perfectly with published
-;; tables--but no two pairs of published tables agree perfectly either! Liu's
-;; rules produce a calendar for 2033 which is not accepted by all authorities.
-;; The date of Chinese New Year is correct from 1644-2051.
-
-;; Technical details of all the calendrical calculations can be found in
-;; ``Calendrical Calculations: The Millennium Edition'' by Edward M. Reingold
-;; and Nachum Dershowitz, Cambridge University Press (2001).
-
-;;; Code:
-
-(defvar date)
-(defvar displayed-month)
-(defvar displayed-year)
-
-(require 'lunar)
-
-(defvar chinese-calendar-celestial-stem
- ["Jia" "Yi" "Bing" "Ding" "Wu" "Ji" "Geng" "Xin" "Ren" "Gui"])
-
-(defvar chinese-calendar-terrestrial-branch
- ["Zi" "Chou" "Yin" "Mao" "Chen" "Si" "Wu" "Wei" "Shen" "You" "Xu" "Hai"])
-
-(defcustom chinese-calendar-time-zone
- '(if (< year 1928)
- (+ 465 (/ 40.0 60.0))
- 480)
- "*Number of minutes difference between local standard time for Chinese
-calendar and Coordinated Universal (Greenwich) Time. Default is for Beijing.
-This is an expression in `year' since it changed at 1928-01-01 00:00:00 from
-UT+7:45:40 to UT+8."
- :type 'sexp
- :group 'chinese-calendar)
-
-(defcustom chinese-calendar-location-name "Beijing"
- "*Name of location used for calculation of Chinese calendar."
- :type 'string
- :group 'chinese-calendar)
-
-(defcustom chinese-calendar-daylight-time-offset 0
-; The correct value is as follows, but the Chinese calendrical
-; authorities do NOT use DST in determining astronomical events:
-; 60
- "*Number of minutes difference between daylight saving and standard time
-for Chinese calendar. Default is for no daylight saving time."
- :type 'integer
- :group 'chinese-calendar)
-
-(defcustom chinese-calendar-standard-time-zone-name
- '(if (< year 1928)
- "PMT"
- "CST")
- "*Abbreviated name of standard time zone used for Chinese calendar.
-This is an expression depending on `year' because it changed
-at 1928-01-01 00:00:00 from `PMT' to `CST'."
- :type 'sexp
- :group 'chinese-calendar)
-
-(defcustom chinese-calendar-daylight-time-zone-name "CDT"
- "*Abbreviated name of daylight saving time zone used for Chinese calendar."
- :type 'string
- :group 'chinese-calendar)
-
-(defcustom chinese-calendar-daylight-savings-starts nil
-; The correct value is as follows, but the Chinese calendrical
-; authorities do NOT use DST in determining astronomical events:
-; '(cond ((< 1986 year) (calendar-nth-named-day 1 0 4 year 10))
-; ((= 1986 year) '(5 4 1986))
-; (t nil))
- "*Sexp giving the date on which daylight saving time starts for Chinese
-calendar. Default is for no daylight saving time. See documentation of
-`calendar-daylight-savings-starts'."
- :type 'sexp
- :group 'chinese-calendar)
-
-(defcustom chinese-calendar-daylight-savings-ends nil
-; The correct value is as follows, but the Chinese calendrical
-; authorities do NOT use DST in determining astronomical events:
-; '(if (<= 1986 year) (calendar-nth-named-day 1 0 9 year 11))
- "*Sexp giving the date on which daylight saving time ends for Chinese
-calendar. Default is for no daylight saving time. See documentation of
-`calendar-daylight-savings-ends'."
- :type 'sexp
- :group 'chinese-calendar)
-
-(defcustom chinese-calendar-daylight-savings-starts-time 0
- "*Number of minutes after midnight that daylight saving time starts for
-Chinese calendar. Default is for no daylight saving time."
- :type 'integer
- :group 'chinese-calendar)
-
-(defcustom chinese-calendar-daylight-savings-ends-time 0
- "*Number of minutes after midnight that daylight saving time ends for
-Chinese calendar. Default is for no daylight saving time."
- :type 'integer
- :group 'chinese-calendar)
-
-(defun chinese-zodiac-sign-on-or-after (d)
- "Absolute date of first new Zodiac sign on or after absolute date d.
-The Zodiac signs begin when the sun's longitude is a multiple of 30 degrees."
- (let* ((year (extract-calendar-year
- (calendar-gregorian-from-absolute d)))
- (calendar-time-zone (eval chinese-calendar-time-zone))
- (calendar-daylight-time-offset
- chinese-calendar-daylight-time-offset)
- (calendar-standard-time-zone-name
- chinese-calendar-standard-time-zone-name)
- (calendar-daylight-time-zone-name
- chinese-calendar-daylight-time-zone-name)
- (calendar-calendar-daylight-savings-starts
- chinese-calendar-daylight-savings-starts)
- (calendar-daylight-savings-ends
- chinese-calendar-daylight-savings-ends)
- (calendar-daylight-savings-starts-time
- chinese-calendar-daylight-savings-starts-time)
- (calendar-daylight-savings-ends-time
- chinese-calendar-daylight-savings-ends-time))
- (floor
- (calendar-absolute-from-astro
- (solar-date-next-longitude
- (calendar-astro-from-absolute d)
- 30)))))
-
-(defun chinese-new-moon-on-or-after (d)
- "Absolute date of first new moon on or after absolute date d."
- (let* ((year (extract-calendar-year
- (calendar-gregorian-from-absolute d)))
- (calendar-time-zone (eval chinese-calendar-time-zone))
- (calendar-daylight-time-offset
- chinese-calendar-daylight-time-offset)
- (calendar-standard-time-zone-name
- chinese-calendar-standard-time-zone-name)
- (calendar-daylight-time-zone-name
- chinese-calendar-daylight-time-zone-name)
- (calendar-calendar-daylight-savings-starts
- chinese-calendar-daylight-savings-starts)
- (calendar-daylight-savings-ends
- chinese-calendar-daylight-savings-ends)
- (calendar-daylight-savings-starts-time
- chinese-calendar-daylight-savings-starts-time)
- (calendar-daylight-savings-ends-time
- chinese-calendar-daylight-savings-ends-time))
- (floor
- (calendar-absolute-from-astro
- (lunar-new-moon-on-or-after
- (calendar-astro-from-absolute d))))))
-
-(defvar chinese-year-cache
- '((1990 (12 726464) (1 726494) (2 726523) (3 726553) (4 726582) (5 726611)
- (5.5 726641) (6 726670) (7 726699) (8 726729) (9 726758) (10 726788)
- (11 726818))
- (1991 (12 726848) (1 726878) (2 726907) (3 726937) (4 726966) (5 726995)
- (6 727025) (7 727054) (8 727083) (9 727113) (10 727142) (11 727172))
- (1992 (12 727202) (1 727232) (2 727261) (3 727291) (4 727321) (5 727350)
- (6 727379) (7 727409) (8 727438) (9 727467) (10 727497) (11 727526))
- (1993 (12 727556) (1 727586) (2 727615) (3 727645) (3.5 727675) (4 727704)
- (5 727734) (6 727763) (7 727793) (8 727822) (9 727851) (10 727881)
- (11 727910))
- (1994 (12 727940) (1 727969) (2 727999) (3 728029) (4 728059) (5 728088)
- (6 728118) (7 728147) (8 728177) (9 728206) (10 728235) (11 728265))
- (1995 (12 728294) (1 728324) (2 728353) (3 728383) (4 728413) (5 728442)
- (6 728472) (7 728501) (8 728531) (8.5 728561) (9 728590) (10 728619)
- (11 728649))
- (1996 (12 728678) (1 728708) (2 728737) (3 728767) (4 728796) (5 728826)
- (6 728856) (7 728885) (8 728915) (9 728944) (10 728974) (11 729004))
- (1997 (12 729033) (1 729062) (2 729092) (3 729121) (4 729151) (5 729180)
- (6 729210) (7 729239) (8 729269) (9 729299) (10 729328) (11 729358))
- (1998 (12 729388) (1 729417) (2 729447) (3 729476) (4 729505) (5 729535)
- (5.5 729564) (6 729593) (7 729623) (8 729653) (9 729682) (10 729712)
- (11 729742))
- (1999 (12 729771) (1 729801) (2 729831) (3 729860) (4 729889) (5 729919)
- (6 729948) (7 729977) (8 730007) (9 730036) (10 730066) (11 730096))
- (2000 (12 730126) (1 730155) (2 730185) (3 730215) (4 730244) (5 730273)
- (6 730303) (7 730332) (8 730361) (9 730391) (10 730420) (11 730450))
- (2001 (12 730480) (1 730509) (2 730539) (3 730569) (4 730598) (4.5 730628)
- (5 730657) (6 730687) (7 730716) (8 730745) (9 730775) (10 730804)
- (11 730834))
- (2002 (12 730863) (1 730893) (2 730923) (3 730953) (4 730982) (5 731012)
- (6 731041) (7 731071) (8 731100) (9 731129) (10 731159) (11 731188))
- (2003 (12 731218) (1 731247) (2 731277) (3 731307) (4 731336) (5 731366)
- (6 731396) (7 731425) (8 731455) (9 731484) (10 731513) (11 731543))
- (2004 (12 731572) (1 731602) (2 731631) (2.5 731661) (3 731690) (4 731720)
- (5 731750) (6 731779) (7 731809) (8 731838) (9 731868) (10 731897)
- (11 731927))
- (2005 (12 731956) (1 731986) (2 732015) (3 732045) (4 732074) (5 732104)
- (6 732133) (7 732163) (8 732193) (9 732222) (10 732252) (11 732281))
- (2006 (12 732311) (1 732340) (2 732370) (3 732399) (4 732429) (5 732458)
- (6 732488) (7 732517) (7.5 732547) (8 732576) (9 732606) (10 732636)
- (11 732665))
- (2007 (12 732695) (1 732725) (2 732754) (3 732783) (4 732813) (5 732842)
- (6 732871) (7 732901) (8 732930) (9 732960) (10 732990) (11 733020))
- (2008 (12 733049) (1 733079) (2 733109) (3 733138) (4 733167) (5 733197)
- (6 733226) (7 733255) (8 733285) (9 733314) (10 733344) (11 733374))
- (2009 (12 733403) (1 733433) (2 733463) (3 733493) (4 733522) (5 733551)
- (5.5 733581) (6 733610) (7 733639) (8 733669) (9 733698) (10 733728)
- (11 733757))
- (2010 (12 733787) (1 733817) (2 733847) (3 733876) (4 733906) (5 733935)
- (6 733965) (7 733994) (8 734023) (9 734053) (10 734082) (11 734112)))
- "An assoc list of Chinese year structures as determined by `chinese-year'.
-
-Values are computed as needed, but to save time, the initial value consists
-of the precomputed years 1990-2010. The code works just as well with this
-set to nil initially (which is how the value for 1990-2010 was computed).")
-
-(defun chinese-year (y)
- "The structure of the Chinese year for Gregorian year Y.
-The result is a list of pairs (i d), where month i begins on absolute date d,
-of the Chinese months from the Chinese month following the solstice in
-Gregorian year Y-1 to the Chinese month of the solstice of Gregorian year Y.
-
-The list is cached for further use."
- (let ((list (cdr (assoc y chinese-year-cache))))
- (if (not list)
- (progn
- (setq list (compute-chinese-year y))
- (setq chinese-year-cache
- (append chinese-year-cache (list (cons y list))))))
- list))
-
-(defun number-chinese-months (list start)
- "Assign month numbers to the lunar months in LIST, starting with START.
-Numbers are assigned sequentially, START, START+1, ..., 11, with half
-numbers used for leap months.
-
-First month of list will never be a leap month, nor will the last."
- (if list
- (if (zerop (- 12 start (length list)))
- ;; List is too short for a leap month
- (cons (list start (car list))
- (number-chinese-months (cdr list) (1+ start)))
- (cons
- ;; First month
- (list start (car list))
- ;; Remaining months
- (if (and (cdr (cdr list));; at least two more months...
- (<= (car (cdr (cdr list)))
- (chinese-zodiac-sign-on-or-after (car (cdr list)))))
- ;; Next month is a leap month
- (cons (list (+ start 0.5) (car (cdr list)))
- (number-chinese-months (cdr (cdr list)) (1+ start)))
- ;; Next month is not a leap month
- (number-chinese-months (cdr list) (1+ start)))))))
-
-(defun chinese-month-list (start end)
- "List of starting dates of Chinese months from START to END."
- (if (<= start end)
- (let ((new-moon (chinese-new-moon-on-or-after start)))
- (if (<= new-moon end)
- (cons new-moon
- (chinese-month-list (1+ new-moon) end))))))
-
-(defun compute-chinese-year (y)
- "Compute the structure of the Chinese year for Gregorian year Y.
-The result is a list of pairs (i d), where month i begins on absolute date d,
-of the Chinese months from the Chinese month following the solstice in
-Gregorian year Y-1 to the Chinese month of the solstice of Gregorian year Y."
- (let* ((next-solstice (chinese-zodiac-sign-on-or-after
- (calendar-absolute-from-gregorian
- (list 12 15 y))))
- (list (chinese-month-list (1+ (chinese-zodiac-sign-on-or-after
- (calendar-absolute-from-gregorian
- (list 12 15 (1- y)))))
- next-solstice))
- (next-sign (chinese-zodiac-sign-on-or-after (car list))))
- (if (= (length list) 12)
- ;; No room for a leap month, just number them 12, 1, 2, ..., 11
- (cons (list 12 (car list))
- (number-chinese-months (cdr list) 1))
- ;; Now we can assign numbers to the list for y
- ;; The first month or two are special
- (if (or (> (car list) next-sign) (>= next-sign (car (cdr list))))
- ;; First month on list is a leap month, second is not
- (append (list (list 11.5 (car list))
- (list 12 (car (cdr list))))
- (number-chinese-months (cdr (cdr list)) 1))
- ;; First month on list is not a leap month
- (append (list (list 12 (car list)))
- (if (>= (chinese-zodiac-sign-on-or-after (car (cdr list)))
- (car (cdr (cdr list))))
- ;; Second month on list is a leap month
- (cons (list 12.5 (car (cdr list)))
- (number-chinese-months (cdr (cdr list)) 1))
- ;; Second month on list is not a leap month
- (number-chinese-months (cdr list) 1)))))))
-
-(defun calendar-absolute-from-chinese (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* ((cycle (car date))
- (year (car (cdr date)))
- (month (car (cdr (cdr date))))
- (day (car (cdr (cdr (cdr date)))))
- (g-year (+ (* (1- cycle) 60);; years in prior cycles
- (1- year) ;; prior years this cycle
- -2636))) ;; years before absolute date 0
- (+ (1- day);; prior days this month
- (car
- (cdr ;; absolute date of start of this month
- (assoc month (append (memq (assoc 1 (chinese-year g-year))
- (chinese-year g-year))
- (chinese-year (1+ g-year)))))))))
-
-(defun calendar-chinese-from-absolute (date)
- "Compute Chinese date (cycle year month day) corresponding to absolute DATE.
-The absolute date is the number of days elapsed since the (imaginary)
-Gregorian date Sunday, December 31, 1 BC."
- (let* ((g-year (extract-calendar-year
- (calendar-gregorian-from-absolute date)))
- (c-year (+ g-year 2695))
- (list (append (chinese-year (1- g-year))
- (chinese-year g-year)
- (chinese-year (1+ g-year)))))
- (while (<= (car (cdr (car (cdr list)))) date)
- ;; the first month on the list is in Chinese year c-year
- ;; date is on or after start of second month on list...
- (if (= 1 (car (car (cdr list))))
- ;; second month on list is a new Chinese year
- (setq c-year (1+ c-year)))
- ;; ...so first month on list is of no interest
- (setq list (cdr list)))
- (list (/ (1- c-year) 60)
- (calendar-mod c-year 60)
- (car (car list))
- (1+ (- date (car (cdr (car list))))))))
-
-(defun holiday-chinese-new-year ()
- "Date of Chinese New Year."
- (let ((m displayed-month)
- (y displayed-year))
- (increment-calendar-month m y 1)
- (if (< m 5)
- (let ((chinese-new-year
- (calendar-gregorian-from-absolute
- (car (cdr (assoc 1 (chinese-year y)))))))
- (if (calendar-date-is-visible-p chinese-new-year)
- (list
- (list chinese-new-year
- (format "Chinese New Year (%s)"
- (calendar-chinese-sexagesimal-name (+ y 57))))))))))
-
-(defun calendar-chinese-date-string (&optional date)
- "String of Chinese date of Gregorian DATE.
-Defaults to today's date if DATE is not given."
- (let* ((a-date (calendar-absolute-from-gregorian
- (or date (calendar-current-date))))
- (c-date (calendar-chinese-from-absolute a-date))
- (cycle (car c-date))
- (year (car (cdr c-date)))
- (month (car (cdr (cdr c-date))))
- (day (car (cdr (cdr (cdr c-date)))))
- (this-month (calendar-absolute-from-chinese
- (list cycle year month 1)))
- (next-month (calendar-absolute-from-chinese
- (list (if (= year 60) (1+ cycle) cycle)
- (if (= (floor month) 12) (1+ year) year)
- (calendar-mod (1+ (floor month)) 12)
- 1)))
- (m-cycle (% (+ (* year 5) (floor month)) 60)))
- (format "Cycle %s, year %s (%s), %smonth %s%s, day %s (%s)"
- cycle
- year (calendar-chinese-sexagesimal-name year)
- (if (not (integerp month))
- "second "
- (if (< 30 (- next-month this-month))
- "first "
- ""))
- (floor month)
- (if (integerp month)
- (format " (%s)" (calendar-chinese-sexagesimal-name
- (+ (* 12 year) month 50)))
- "")
- day (calendar-chinese-sexagesimal-name (+ a-date 15)))))
-
-(defun calendar-chinese-sexagesimal-name (n)
- "The N-th name of the Chinese sexagesimal cycle.
-N congruent to 1 gives the first name, N congruent to 2 gives the second name,
-..., N congruent to 60 gives the sixtieth name."
- (format "%s-%s"
- (aref chinese-calendar-celestial-stem (% (1- n) 10))
- (aref chinese-calendar-terrestrial-branch (% (1- n) 12))))
-
-(defun calendar-print-chinese-date ()
- "Show the Chinese date equivalents of date."
- (interactive)
- (message "Computing Chinese date...")
- (message "Chinese date: %s"
- (calendar-chinese-date-string (calendar-cursor-to-date t))))
-
-(defun calendar-goto-chinese-date (date &optional noecho)
- "Move cursor to Chinese date DATE.
-Echo Chinese date unless NOECHO is t."
- (interactive
- (let* ((c (calendar-chinese-from-absolute
- (calendar-absolute-from-gregorian
- (calendar-current-date))))
- (cycle (calendar-read
- "Chinese calendar cycle number (>44): "
- '(lambda (x) (> x 44))
- (int-to-string (car c))))
- (year (calendar-read
- "Year in Chinese cycle (1..60): "
- '(lambda (x) (and (<= 1 x) (<= x 60)))
- (int-to-string (car (cdr c)))))
- (month-list (make-chinese-month-assoc-list
- (chinese-months cycle year)))
- (month (cdr (assoc
- (completing-read "Chinese calendar month: "
- month-list nil t)
- month-list)))
- (last (if (= month
- (car (cdr (cdr
- (calendar-chinese-from-absolute
- (+ 29
- (calendar-absolute-from-chinese
- (list cycle year month 1))))))))
- 30
- 29))
- (day (calendar-read
- (format "Chinese calendar day (1-%d): " last)
- '(lambda (x) (and (<= 1 x) (<= x last))))))
- (list (list cycle year month day))))
- (calendar-goto-date (calendar-gregorian-from-absolute
- (calendar-absolute-from-chinese date)))
- (or noecho (calendar-print-chinese-date)))
-
-(defun chinese-months (c y)
- "A list of the months in cycle C, year Y of the Chinese calendar."
- (let* ((l (memq 1 (append
- (mapcar '(lambda (x)
- (car x))
- (chinese-year (extract-calendar-year
- (calendar-gregorian-from-absolute
- (calendar-absolute-from-chinese
- (list c y 1 1))))))
- (mapcar '(lambda (x)
- (if (> (car x) 11) (car x)))
- (chinese-year (extract-calendar-year
- (calendar-gregorian-from-absolute
- (calendar-absolute-from-chinese
- (list (if (= y 60) (1+ c) c)
- (if (= y 60) 1 y)
- 1 1))))))))))
- l))
-
-(defun make-chinese-month-assoc-list (l)
- "Make list of months L into an assoc list."
- (if (and l (car l))
- (if (and (cdr l) (car (cdr l)))
- (if (= (car l) (floor (car (cdr l))))
- (append
- (list (cons (format "%s (first)" (car l)) (car l))
- (cons (format "%s (second)" (car l)) (car (cdr l))))
- (make-chinese-month-assoc-list (cdr (cdr l))))
- (append
- (list (cons (int-to-string (car l)) (car l)))
- (make-chinese-month-assoc-list (cdr l))))
- (list (cons (int-to-string (car l)) (car l))))))
-
-(defun diary-chinese-date ()
- "Chinese calendar equivalent of date diary entry."
- (format "Chinese date: %s" (calendar-chinese-date-string date)))
-
-(provide 'cal-china)
-
-;;; arch-tag: 7e5b7e0d-676c-47e3-8696-93e7ea0ab644
-;;; cal-china.el ends here
+;;; cal-china.el --- calendar functions for the Chinese calendar
+
+;; Copyright (C) 1995, 1997, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
+;; 2008 Free Software Foundation, Inc.
+
+;; Author: Edward M. Reingold <reingold@cs.uiuc.edu>
+;; Maintainer: Glenn Morris <rgm@gnu.org>
+;; Keywords: calendar
+;; Human-Keywords: Chinese calendar, calendar, holidays, 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 3, 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., 51 Franklin Street, Fifth Floor,
+;; Boston, MA 02110-1301, USA.
+
+;;; Commentary:
+
+;; See calendar.el.
+
+;; The rules used for the Chinese calendar are those of Baolin Liu
+;; (see L. E. Doggett's article "Calendars" in the Explanatory
+;; Supplement to the Astronomical Almanac, second edition, 1992) for
+;; the calendar as revised at the beginning of the Qing dynasty in
+;; 1644. The nature of the astronomical calculations is such that
+;; precise calculations cannot be made without great expense in time,
+;; so that the calendars produced may not agree perfectly with
+;; published tables--but no two pairs of published tables agree
+;; perfectly either! Liu's rules produce a calendar for 2033 which is
+;; not accepted by all authorities. The date of Chinese New Year is
+;; correct from 1644-2051.
+
+;; Note to maintainers:
+;; Use `chinese-year-cache-init' every few years to recenter the default
+;; value of `chinese-year-cache'.
+
+;;; Code:
+
+(require 'calendar)
+(require 'lunar) ; lunar-new-moon-on-or-after
+;; solar-date-next-longitude brought in by lunar.
+;;;(require 'solar)
+;; calendar-astro-to-absolute and from-absolute are cal-autoloads.
+;;;(require 'cal-julian)
+
+
+(defgroup calendar-chinese nil
+ "Chinese calendar support."
+ :prefix "calendar-chinese-"
+ :group 'calendar)
+
+(defcustom calendar-chinese-time-zone
+ '(if (< year 1928)
+ (+ 465 (/ 40.0 60.0))
+ 480)
+ "Minutes difference between local standard time for Chinese calendar and UTC.
+Default is for Beijing. This is an expression in `year' since it changed at
+1928-01-01 00:00:00 from UT+7:45:40 to UT+8."
+ :type 'sexp
+ :group 'calendar-chinese)
+
+(define-obsolete-variable-alias 'chinese-calendar-time-zone
+ 'calendar-chinese-time-zone "23.1")
+
+;; FIXME unused.
+(defcustom calendar-chinese-location-name "Beijing"
+ "Name of location used for calculation of Chinese calendar."
+ :type 'string
+ :group 'calendar-chinese)
+
+(define-obsolete-variable-alias 'chinese-calendar-location-name
+ 'calendar-chinese-location-name "23.1")
+
+(defcustom calendar-chinese-daylight-time-offset 0
+;; The correct value is as follows, but the Chinese calendrical
+;; authorities do NOT use DST in determining astronomical events:
+;; 60
+ "Minutes difference between daylight saving and standard time.
+Default is for no daylight saving time."
+ :type 'integer
+ :group 'calendar-chinese)
+
+(define-obsolete-variable-alias 'chinese-calendar-daylight-time-offset
+ 'calendar-chinese-daylight-time-offset "23.1")
+
+(defcustom calendar-chinese-standard-time-zone-name
+ '(if (< year 1928)
+ "PMT"
+ "CST")
+ "Abbreviated name of standard time zone used for Chinese calendar.
+This is an expression depending on `year' because it changed
+at 1928-01-01 00:00:00 from `PMT' to `CST'."
+ :type 'sexp
+ :group 'calendar-chinese)
+
+(define-obsolete-variable-alias 'chinese-calendar-standard-time-zone-name
+ 'calendar-chinese-standard-time-zone-name "23.1")
+
+(defcustom calendar-chinese-daylight-time-zone-name "CDT"
+ "Abbreviated name of daylight saving time zone used for Chinese calendar."
+ :type 'string
+ :group 'calendar-chinese)
+
+(define-obsolete-variable-alias 'chinese-calendar-daylight-time-zone-name
+ 'calendar-chinese-daylight-time-zone-name "23.1")
+
+(defcustom calendar-chinese-daylight-saving-start nil
+;; The correct value is as follows, but the Chinese calendrical
+;; authorities do NOT use DST in determining astronomical events:
+;; '(cond ((< 1986 year) (calendar-nth-named-day 1 0 4 year 10))
+;; ((= 1986 year) '(5 4 1986))
+;; (t nil))
+ "Sexp giving the date on which daylight saving time starts.
+Default is for no daylight saving time. See documentation of
+`calendar-daylight-savings-starts'."
+ :type 'sexp
+ :group 'calendar-chinese)
+
+(define-obsolete-variable-alias 'chinese-calendar-daylight-savings-starts
+ 'calendar-chinese-daylight-saving-start "23.1")
+
+(defcustom calendar-chinese-daylight-saving-end nil
+;; The correct value is as follows, but the Chinese calendrical
+;; authorities do NOT use DST in determining astronomical events:
+;; '(if (<= 1986 year) (calendar-nth-named-day 1 0 9 year 11))
+ "Sexp giving the date on which daylight saving time ends.
+Default is for no daylight saving time. See documentation of
+`calendar-daylight-savings-ends'."
+ :type 'sexp
+ :group 'calendar-chinese)
+
+(define-obsolete-variable-alias 'chinese-calendar-daylight-savings-ends
+ 'calendar-chinese-daylight-saving-end "23.1")
+
+(defcustom calendar-chinese-daylight-saving-start-time 0
+ "Number of minutes after midnight that daylight saving time starts.
+Default is for no daylight saving time."
+ :type 'integer
+ :group 'calendar-chinese)
+
+(define-obsolete-variable-alias 'chinese-calendar-daylight-savings-starts-time
+ 'calendar-chinese-daylight-saving-start-time "23.1")
+
+(defcustom calendar-chinese-daylight-saving-end-time 0
+ "Number of minutes after midnight that daylight saving time ends.
+Default is for no daylight saving time."
+ :type 'integer
+ :group 'calendar-chinese)
+
+(define-obsolete-variable-alias 'chinese-calendar-daylight-savings-ends-time
+ 'calendar-chinese-daylight-saving-end-time "23.1")
+
+(defcustom calendar-chinese-celestial-stem
+ ["Jia" "Yi" "Bing" "Ding" "Wu" "Ji" "Geng" "Xin" "Ren" "Gui"]
+ "Prefixes used by `calendar-chinese-sexagesimal-name'."
+ :group 'calendar-chinese
+ :type '(vector (string :tag "Jia")
+ (string :tag "Yi")
+ (string :tag "Bing")
+ (string :tag "Ding")
+ (string :tag "Wu")
+ (string :tag "Ji")
+ (string :tag "Geng")
+ (string :tag "Xin")
+ (string :tag "Ren")
+ (string :tag "Gui")))
+
+(define-obsolete-variable-alias 'chinese-calendar-celestial-stem
+ 'calendar-chinese-celestial-stem "23.1")
+
+(defcustom calendar-chinese-terrestrial-branch
+ ["Zi" "Chou" "Yin" "Mao" "Chen" "Si" "Wu" "Wei" "Shen" "You" "Xu" "Hai"]
+ "Suffixes used by `calendar-chinese-sexagesimal-name'."
+ :group 'calendar-chinese
+ :type '(vector (string :tag "Zi")
+ (string :tag "Chou")
+ (string :tag "Yin")
+ (string :tag "Mao")
+ (string :tag "Chen")
+ (string :tag "Si")
+ (string :tag "Wu")
+ (string :tag "Wei")
+ (string :tag "Shen")
+ (string :tag "You")
+ (string :tag "Xu")
+ (string :tag "Hai")))
+
+(define-obsolete-variable-alias 'chinese-calendar-terrestrial-branch
+ 'calendar-chinese-terrestrial-branch "23.1")
+
+;;; End of user options.
+
+
+(defun calendar-chinese-sexagesimal-name (n)
+ "The N-th name of the Chinese sexagesimal cycle.
+N congruent to 1 gives the first name, N congruent to 2 gives the second name,
+..., N congruent to 60 gives the sixtieth name."
+ (format "%s-%s"
+ (aref calendar-chinese-celestial-stem (% (1- n) 10))
+ (aref calendar-chinese-terrestrial-branch (% (1- n) 12))))
+
+(defun calendar-chinese-zodiac-sign-on-or-after (d)
+ "Absolute date of first new Zodiac sign on or after absolute date D.
+The Zodiac signs begin when the sun's longitude is a multiple of 30 degrees."
+ (let* ((year (extract-calendar-year (calendar-gregorian-from-absolute d)))
+ (calendar-time-zone (eval calendar-chinese-time-zone)) ; uses year
+ (calendar-daylight-time-offset
+ calendar-chinese-daylight-time-offset)
+ (calendar-standard-time-zone-name
+ calendar-chinese-standard-time-zone-name)
+ (calendar-daylight-time-zone-name
+ calendar-chinese-daylight-time-zone-name)
+ (calendar-daylight-savings-starts
+ calendar-chinese-daylight-saving-start)
+ (calendar-daylight-savings-ends
+ calendar-chinese-daylight-saving-end)
+ (calendar-daylight-savings-starts-time
+ calendar-chinese-daylight-saving-start-time)
+ (calendar-daylight-savings-ends-time
+ calendar-chinese-daylight-saving-end-time))
+ (floor
+ (calendar-astro-to-absolute
+ (solar-date-next-longitude (calendar-astro-from-absolute d) 30)))))
+
+(defun calendar-chinese-new-moon-on-or-after (d)
+ "Absolute date of first new moon on or after absolute date D."
+ (let* ((year (extract-calendar-year (calendar-gregorian-from-absolute d)))
+ (calendar-time-zone (eval calendar-chinese-time-zone))
+ (calendar-daylight-time-offset
+ calendar-chinese-daylight-time-offset)
+ (calendar-standard-time-zone-name
+ calendar-chinese-standard-time-zone-name)
+ (calendar-daylight-time-zone-name
+ calendar-chinese-daylight-time-zone-name)
+ (calendar-daylight-savings-starts
+ calendar-chinese-daylight-saving-start)
+ (calendar-daylight-savings-ends
+ calendar-chinese-daylight-saving-end)
+ (calendar-daylight-savings-starts-time
+ calendar-chinese-daylight-saving-start-time)
+ (calendar-daylight-savings-ends-time
+ calendar-chinese-daylight-saving-end-time))
+ (floor
+ (calendar-astro-to-absolute
+ (lunar-new-moon-on-or-after (calendar-astro-from-absolute d))))))
+
+(defun calendar-chinese-month-list (start end)
+ "List of starting dates of Chinese months from START to END."
+ (if (<= start end)
+ (let ((new-moon (calendar-chinese-new-moon-on-or-after start)))
+ (if (<= new-moon end)
+ (cons new-moon
+ (calendar-chinese-month-list (1+ new-moon) end))))))
+
+(defun calendar-chinese-number-months (list start)
+ "Assign month numbers to the lunar months in LIST, starting with START.
+Numbers are assigned sequentially, START, START+1, ..., 11, with
+half numbers used for leap months. First and last months of list
+are never leap months."
+ (when list
+ (cons (list start (car list)) ; first month
+ ;; Remaining months.
+ (if (zerop (- 12 start (length list)))
+ ;; List is too short for a leap month.
+ (calendar-chinese-number-months (cdr list) (1+ start))
+ (if (and (cddr list) ; at least two more months...
+ (<= (nth 2 list)
+ (calendar-chinese-zodiac-sign-on-or-after
+ (cadr list))))
+ ;; Next month is a leap month.
+ (cons (list (+ start 0.5) (cadr list))
+ (calendar-chinese-number-months (cddr list) (1+ start)))
+ ;; Next month is not a leap month.
+ (calendar-chinese-number-months (cdr list) (1+ start)))))))
+
+(defun calendar-chinese-compute-year (y)
+ "Compute the structure of the Chinese year for Gregorian year Y.
+The result is a list of pairs (i d), where month i begins on absolute date d,
+of the Chinese months from the Chinese month following the solstice in
+Gregorian year Y-1 to the Chinese month of the solstice of Gregorian year Y."
+ (let* ((next-solstice (calendar-chinese-zodiac-sign-on-or-after
+ (calendar-absolute-from-gregorian
+ (list 12 15 y))))
+ (list (calendar-chinese-month-list
+ (1+ (calendar-chinese-zodiac-sign-on-or-after
+ (calendar-absolute-from-gregorian
+ (list 12 15 (1- y)))))
+ next-solstice))
+ (next-sign (calendar-chinese-zodiac-sign-on-or-after (car list))))
+ (if (= (length list) 12)
+ ;; No room for a leap month, just number them 12, 1, 2, ..., 11.
+ (cons (list 12 (car list))
+ (calendar-chinese-number-months (cdr list) 1))
+ ;; Now we can assign numbers to the list for y.
+ ;; The first month or two are special.
+ (if (or (> (car list) next-sign) (>= next-sign (cadr list)))
+ ;; First month on list is a leap month, second is not.
+ (append (list (list 11.5 (car list))
+ (list 12 (cadr list)))
+ (calendar-chinese-number-months (cddr list) 1))
+ ;; First month on list is not a leap month.
+ (append (list (list 12 (car list)))
+ (if (>= (calendar-chinese-zodiac-sign-on-or-after (cadr list))
+ (nth 2 list))
+ ;; Second month on list is a leap month.
+ (cons (list 12.5 (cadr list))
+ (calendar-chinese-number-months (cddr list) 1))
+ ;; Second month on list is not a leap month.
+ (calendar-chinese-number-months (cdr list) 1)))))))
+
+(defvar calendar-chinese-year-cache
+ ;; Maintainers: delete existing value, position point at start of
+ ;; empty line, then call M-: (calendar-chinese-year-cache-init N)
+ '((2000 (12 730126) (1 730155) (2 730185) (3 730215) (4 730244) (5 730273)
+ (6 730303) (7 730332) (8 730361) (9 730391) (10 730420) (11 730450))
+ (2001 (12 730480) (1 730509) (2 730539) (3 730569) (4 730598) (4.5 730628)
+ (5 730657) (6 730687) (7 730716) (8 730745) (9 730775) (10 730804)
+ (11 730834))
+ (2002 (12 730863) (1 730893) (2 730923) (3 730953) (4 730982) (5 731012)
+ (6 731041) (7 731071) (8 731100) (9 731129) (10 731159) (11 731188))
+ (2003 (12 731218) (1 731247) (2 731277) (3 731307) (4 731336) (5 731366)
+ (6 731396) (7 731425) (8 731455) (9 731484) (10 731513) (11 731543))
+ (2004 (12 731572) (1 731602) (2 731631) (2.5 731661) (3 731690) (4 731720)
+ (5 731750) (6 731779) (7 731809) (8 731838) (9 731868) (10 731897)
+ (11 731927))
+ (2005 (12 731956) (1 731986) (2 732015) (3 732045) (4 732074) (5 732104)
+ (6 732133) (7 732163) (8 732193) (9 732222) (10 732252) (11 732281))
+ (2006 (12 732311) (1 732340) (2 732370) (3 732399) (4 732429) (5 732458)
+ (6 732488) (7 732517) (7.5 732547) (8 732576) (9 732606) (10 732636)
+ (11 732665))
+ (2007 (12 732695) (1 732725) (2 732754) (3 732783) (4 732813) (5 732842)
+ (6 732871) (7 732901) (8 732930) (9 732960) (10 732990) (11 733020))
+ (2008 (12 733049) (1 733079) (2 733109) (3 733138) (4 733167) (5 733197)
+ (6 733226) (7 733255) (8 733285) (9 733314) (10 733344) (11 733374))
+ (2009 (12 733403) (1 733433) (2 733463) (3 733493) (4 733522) (5 733551)
+ (5.5 733581) (6 733610) (7 733639) (8 733669) (9 733698) (10 733728)
+ (11 733757))
+ (2010 (12 733787) (1 733817) (2 733847) (3 733876) (4 733906) (5 733935)
+ (6 733965) (7 733994) (8 734023) (9 734053) (10 734082) (11 734112))
+ (2011 (12 734141) (1 734171) (2 734201) (3 734230) (4 734260) (5 734290)
+ (6 734319) (7 734349) (8 734378) (9 734407) (10 734437) (11 734466))
+ (2012 (12 734496) (1 734525) (2 734555) (3 734584) (4 734614) (4.5 734644)
+ (5 734673) (6 734703) (7 734732) (8 734762) (9 734791) (10 734821)
+ (11 734850))
+ (2013 (12 734880) (1 734909) (2 734939) (3 734968) (4 734998) (5 735027)
+ (6 735057) (7 735087) (8 735116) (9 735146) (10 735175) (11 735205))
+ (2014 (12 735234) (1 735264) (2 735293) (3 735323) (4 735352) (5 735382)
+ (6 735411) (7 735441) (8 735470) (9 735500) (9.5 735530) (10 735559)
+ (11 735589))
+ (2015 (12 735618) (1 735648) (2 735677) (3 735707) (4 735736) (5 735765)
+ (6 735795) (7 735824) (8 735854) (9 735884) (10 735914) (11 735943))
+ (2016 (12 735973) (1 736002) (2 736032) (3 736061) (4 736091) (5 736120)
+ (6 736149) (7 736179) (8 736208) (9 736238) (10 736268) (11 736297))
+ (2017 (12 736327) (1 736357) (2 736386) (3 736416) (4 736445) (5 736475)
+ (6 736504) (6.5 736533) (7 736563) (8 736592) (9 736622) (10 736651)
+ (11 736681))
+ (2018 (12 736711) (1 736741) (2 736770) (3 736800) (4 736829) (5 736859)
+ (6 736888) (7 736917) (8 736947) (9 736976) (10 737006) (11 737035))
+ (2019 (12 737065) (1 737095) (2 737125) (3 737154) (4 737184) (5 737213)
+ (6 737243) (7 737272) (8 737301) (9 737331) (10 737360) (11 737389))
+ (2020 (12 737419) (1 737449) (2 737478) (3 737508) (4 737538) (4.5 737568)
+ (5 737597) (6 737627) (7 737656) (8 737685) (9 737715) (10 737744)
+ (11 737774)))
+ "Alist of Chinese year structures as determined by `chinese-year'.
+The default can be nil, but some values are precomputed for efficiency.")
+
+(defun calendar-chinese-year (y)
+ "The structure of the Chinese year for Gregorian year Y.
+The result is a list of pairs (i d), where month i begins on absolute date d,
+of the Chinese months from the Chinese month following the solstice in
+Gregorian year Y-1 to the Chinese month of the solstice of Gregorian year Y.
+The list is cached in `calendar-chinese-year-cache' for further use."
+ (let ((list (cdr (assoc y calendar-chinese-year-cache))))
+ (or list
+ (setq list (calendar-chinese-compute-year y)
+ calendar-chinese-year-cache (append calendar-chinese-year-cache
+ (list (cons y list)))))
+ list))
+
+;; Maintainer use.
+(defun calendar-chinese-year-cache-init (year)
+ "Insert an initialization value for `calendar-chinese-year-cache' after point.
+Computes values for 10 years either side of YEAR."
+ (setq year (- year 10))
+ (let (calendar-chinese-year-cache end)
+ (save-excursion
+ (insert "'(")
+ (dotimes (n 21)
+ (princ (cons year (calendar-chinese-compute-year year))
+ (current-buffer))
+ (insert (if (= n 20) ")" "\n"))
+ (setq year (1+ year)))
+ (setq end (point)))
+ (save-excursion
+ ;; fill-column -/+ 5.
+ (while (and (< (point) end)
+ (re-search-forward "^.\\{65,75\\})" end t))
+ (delete-char 1)
+ (insert "\n")))
+ (indent-region (point) end)))
+
+(defun calendar-chinese-to-absolute (date)
+ "The number of days elapsed between the Gregorian date 12/31/1 BC and DATE.
+DATE is a Chinese date (cycle year month day). The Gregorian date
+Sunday, December 31, 1 BC is imaginary."
+ (let* ((cycle (car date))
+ (year (cadr date))
+ (month (nth 2 date))
+ (day (nth 3 date))
+ (g-year (+ (* (1- cycle) 60) ; years in prior cycles
+ (1- year) ; prior years this cycle
+ -2636))) ; years before absolute date 0
+ (+ (1- day) ; prior days this month
+ (cadr ; absolute date of start of this month
+ (assoc month (append (memq (assoc 1 (calendar-chinese-year g-year))
+ (calendar-chinese-year g-year))
+ (calendar-chinese-year (1+ g-year))))))))
+
+(define-obsolete-function-alias 'calendar-absolute-from-chinese
+ 'calendar-chinese-to-absolute "23.1")
+
+(defun calendar-chinese-from-absolute (date)
+ "Compute Chinese date (cycle year month day) corresponding to absolute DATE.
+The absolute date is the number of days elapsed since the (imaginary)
+Gregorian date Sunday, December 31, 1 BC."
+ (let* ((g-year (extract-calendar-year
+ (calendar-gregorian-from-absolute date)))
+ (c-year (+ g-year 2695))
+ (list (append (calendar-chinese-year (1- g-year))
+ (calendar-chinese-year g-year)
+ (calendar-chinese-year (1+ g-year)))))
+ (while (<= (cadr (cadr list)) date)
+ ;; The first month on the list is in Chinese year c-year.
+ ;; Date is on or after start of second month on list...
+ (if (= 1 (caar (cdr list)))
+ ;; Second month on list is a new Chinese year...
+ (setq c-year (1+ c-year)))
+ ;; ...so first month on list is of no interest.
+ (setq list (cdr list)))
+ (list (/ (1- c-year) 60)
+ ;; Remainder of c-year/60 with 60 instead of 0.
+ (1+ (mod (1- c-year) 60))
+ (caar list)
+ (1+ (- date (cadr (car list)))))))
+
+;; Bound in generate-calendar.
+(defvar displayed-month)
+(defvar displayed-year)
+
+;;;###holiday-autoload
+(defun holiday-chinese-new-year ()
+ "Date of Chinese New Year, if visible in calendar.
+Returns (((MONTH DAY YEAR) TEXT)), where the date is Gregorian."
+ (let ((m displayed-month)
+ (y displayed-year)
+ chinese-new-year)
+ ;; In the Gregorian calendar, CNY falls between Jan 21 and Feb 20.
+ ;; Jan is visible if displayed-month = 12, 1, 2; Feb if d-m = 1, 2, 3.
+ ;; If we shift the calendar forward one month, we can do a
+ ;; one-sided test, namely: d-m <= 4 means CNY might be visible.
+ (increment-calendar-month m y 1) ; shift forward a month
+ (and (< m 5)
+ (calendar-date-is-visible-p
+ (setq chinese-new-year
+ (calendar-gregorian-from-absolute
+ (cadr (assoc 1 (calendar-chinese-year y))))))
+ (list
+ (list chinese-new-year
+ (format "Chinese New Year (%s)"
+ (calendar-chinese-sexagesimal-name (+ y 57))))))))
+
+;;;###cal-autoload
+(defun calendar-chinese-date-string (&optional date)
+ "String of Chinese date of Gregorian DATE.
+Defaults to today's date if DATE is not given."
+ (let* ((a-date (calendar-absolute-from-gregorian
+ (or date (calendar-current-date))))
+ (c-date (calendar-chinese-from-absolute a-date))
+ (cycle (car c-date))
+ (year (cadr c-date))
+ (month (nth 2 c-date))
+ (day (nth 3 c-date))
+ (this-month (calendar-chinese-to-absolute
+ (list cycle year month 1)))
+ (next-month (calendar-chinese-to-absolute
+ (list (if (= year 60) (1+ cycle) cycle)
+ (if (= (floor month) 12) (1+ year) year)
+ ;; Remainder of (1+(floor month))/12, with
+ ;; 12 instead of 0.
+ (1+ (mod (floor month) 12))
+ 1)))
+ (m-cycle (% (+ (* year 5) (floor month)) 60)))
+ (format "Cycle %s, year %s (%s), %smonth %s%s, day %s (%s)"
+ cycle
+ year (calendar-chinese-sexagesimal-name year)
+ (if (not (integerp month))
+ "second "
+ (if (< 30 (- next-month this-month))
+ "first "
+ ""))
+ (floor month)
+ (if (integerp month)
+ (format " (%s)" (calendar-chinese-sexagesimal-name
+ (+ (* 12 year) month 50)))
+ "")
+ day (calendar-chinese-sexagesimal-name (+ a-date 15)))))
+
+;;;###cal-autoload
+(defun calendar-chinese-print-date ()
+ "Show the Chinese date equivalents of date."
+ (interactive)
+ (message "Computing Chinese date...")
+ (message "Chinese date: %s"
+ (calendar-chinese-date-string (calendar-cursor-to-date t))))
+
+(define-obsolete-function-alias 'calendar-print-chinese-date
+ 'calendar-chinese-print-date "23.1")
+
+(defun calendar-chinese-months-to-alist (l)
+ "Make list of months L into an assoc list."
+ (and l (car l)
+ (if (and (cdr l) (cadr l))
+ (if (= (car l) (floor (cadr l)))
+ (append
+ (list (cons (format "%s (first)" (car l)) (car l))
+ (cons (format "%s (second)" (car l)) (cadr l)))
+ (calendar-chinese-months-to-alist (cddr l)))
+ (append
+ (list (cons (int-to-string (car l)) (car l)))
+ (calendar-chinese-months-to-alist (cdr l))))
+ (list (cons (int-to-string (car l)) (car l))))))
+
+(defun calendar-chinese-months (c y)
+ "A list of the months in cycle C, year Y of the Chinese calendar."
+ (memq 1 (append
+ (mapcar (lambda (x)
+ (car x))
+ (calendar-chinese-year (extract-calendar-year
+ (calendar-gregorian-from-absolute
+ (calendar-chinese-to-absolute
+ (list c y 1 1))))))
+ (mapcar (lambda (x)
+ (if (> (car x) 11) (car x)))
+ (calendar-chinese-year (extract-calendar-year
+ (calendar-gregorian-from-absolute
+ (calendar-chinese-to-absolute
+ (list (if (= y 60) (1+ c) c)
+ (if (= y 60) 1 y)
+ 1 1)))))))))
+
+;;;###cal-autoload
+(defun calendar-chinese-goto-date (date &optional noecho)
+ "Move cursor to Chinese date DATE.
+Echo Chinese date unless NOECHO is non-nil."
+ (interactive
+ (let* ((c (calendar-chinese-from-absolute
+ (calendar-absolute-from-gregorian (calendar-current-date))))
+ (cycle (calendar-read
+ "Chinese calendar cycle number (>44): "
+ (lambda (x) (> x 44))
+ (int-to-string (car c))))
+ (year (calendar-read
+ "Year in Chinese cycle (1..60): "
+ (lambda (x) (and (<= 1 x) (<= x 60)))
+ (int-to-string (cadr c))))
+ (month-list (calendar-chinese-months-to-alist
+ (calendar-chinese-months cycle year)))
+ (month (cdr (assoc
+ (completing-read "Chinese calendar month: "
+ month-list nil t)
+ month-list)))
+ (last (if (= month
+ (nth 2
+ (calendar-chinese-from-absolute
+ (+ 29
+ (calendar-chinese-to-absolute
+ (list cycle year month 1))))))
+ 30
+ 29))
+ (day (calendar-read
+ (format "Chinese calendar day (1-%d): " last)
+ (lambda (x) (and (<= 1 x) (<= x last))))))
+ (list (list cycle year month day))))
+ (calendar-goto-date (calendar-gregorian-from-absolute
+ (calendar-chinese-to-absolute date)))
+ (or noecho (calendar-chinese-print-date)))
+
+(define-obsolete-function-alias 'calendar-goto-chinese-date
+ 'calendar-chinese-goto-date "23.1")
+
+(defvar date)
+
+;; To be called from diary-list-sexp-entries, where DATE is bound.
+;;;###diary-autoload
+(defun diary-chinese-date ()
+ "Chinese calendar equivalent of date diary entry."
+ (format "Chinese date: %s" (calendar-chinese-date-string date)))
+
+(provide 'cal-china)
+
+;; arch-tag: 7e5b7e0d-676c-47e3-8696-93e7ea0ab644
+;;; cal-china.el ends here
HCoop / bpt / emacs.git / blobdiff