-;;; cal-chinese.el --- calendar functions for the Chinese calendar.
+;;; cal-china.el --- calendar functions for the Chinese calendar
-;; Copyright (C) 1995 Free Software Foundation, Inc.
+;; Copyright (C) 1995, 1997, 2001, 2002, 2003, 2004, 2005, 2006, 2007
+;; 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
;; 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.
+;; 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. It was
-;; written by
-
-;; 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
+;; 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:
-(require 'lunar)
+(defvar date)
+(defvar displayed-month)
+(defvar displayed-year)
-(defvar chinese-calendar-terrestrial-branch
- ["Zi" "Chou" "Yin" "Mao" "Chen" "Si" "Wu" "Wei" "Shen" "You" "Xu" "Hai"])
+(require 'lunar)
(defvar chinese-calendar-celestial-stem
["Jia" "Yi" "Bing" "Ding" "Wu" "Ji" "Geng" "Xin" "Ren" "Gui"])
-(defvar chinese-calendar-time-zone
+(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.")
-
-(defvar chinese-calendar-location-name "Beijing"
- "*Name of location used for calculation of Chinese calendar.")
-
-(defvar chinese-calendar-daylight-time-offset 0
-; The correct value is as follows, but I don't believe the Chinese calendrical
-; authorities would use DST in determining astronomical events:
+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 savings and standard time
-for Chinese calendar. Default is for no daylight savings time.")
+ "*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)
-(defvar chinese-calendar-standard-time-zone-name
+(defcustom chinese-calendar-standard-time-zone-name
'(if (< year 1928)
"PMT"
"CST")
- "*Abbreviated name of standard time zone used for Chinese calendar.")
-
-(defvar chinese-calendar-daylight-time-zone-name "CDT"
- "*Abbreviated name of daylight-savings time zone used for Chinese calendar.")
-
-(defvar chinese-calendar-daylight-savings-starts nil
-; The correct value is as follows, but I don't believe the Chinese calendrical
-; authorities would use DST in determining astronomical events:
+ "*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 savings time starts for Chinese
-calendar. Default is for no daylight savings time. See documentation of
-`calendar-daylight-savings-starts'.")
-
-(defvar chinese-calendar-daylight-savings-ends nil
-; The correct value is as follows, but I don't believe the Chinese calendrical
-; authorities would use DST in determining astronomical events:
+ "*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 savings time ends for Chinese
-calendar. Default is for no daylight savings time. See documentation of
-`calendar-daylight-savings-ends'.")
-
-(defvar chinese-calendar-daylight-savings-starts-time 0
- "*Number of minutes after midnight that daylight savings time starts for
-Chinese calendar. Default is for no daylight savings time.")
-
-(defvar chinese-calendar-daylight-savings-ends-time 0
- "*Number of minutes after midnight that daylight savings time ends for
-Chinese calendar. Default is for no daylight savings time.")
+ "*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
- (floor (calendar-absolute-from-astro d)))))
+ (calendar-gregorian-from-absolute d)))
(calendar-time-zone (eval chinese-calendar-time-zone))
(calendar-daylight-time-offset
chinese-calendar-daylight-time-offset)
(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."
(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
- (new-year (chinese-new-year g-year))
- (current-month new-year)
- (current-month-number 1)
- (next-month (chinese-new-moon-on-or-after (1+ new-year)))
- (next-sign (chinese-zodiac-sign-on-or-after
- (1+ (chinese-zodiac-sign-on-or-after current-month))))
- (had-leap-month nil))
- (while (< current-month-number month)
- ;; current-month < next-month <= next-sign
- (setq current-month next-month)
- (setq next-month (chinese-new-moon-on-or-after (1+ current-month)))
- (if (and (<= next-month next-sign) (not had-leap-month))
- (progn;; leap month
- (setq current-month-number (+ current-month-number 0.5))
- (setq had-leap-month t))
- (setq current-month-number (floor (1+ current-month-number)))
- (setq next-sign (chinese-zodiac-sign-on-or-after (1+ next-sign)))))
- (+ current-month (1- day))))
+ (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* ((greg-date (calendar-gregorian-from-absolute date))
- (greg-year (1- (extract-calendar-year greg-date)))
- (greg-year
- (+ greg-year
- (calendar-sum y greg-year
- (>= date (chinese-new-year (1+ y))) 1)) )
- (chinese-year (+ greg-year 2697))
- (cycle (/ (1- chinese-year) 60)) ;; previous cycles
- (year (calendar-mod chinese-year 60));; years this cycle
- (current-month (chinese-new-year greg-year))
- (month 1)
- (next-month (chinese-new-moon-on-or-after (1+ current-month)))
- (next-sign (chinese-zodiac-sign-on-or-after
- (1+ (chinese-zodiac-sign-on-or-after current-month))))
- (had-leap-month nil))
- (while (<= next-month date)
- ;; current-month < next-month <= next-sign
- (setq current-month next-month)
- (setq next-month (chinese-new-moon-on-or-after (1+ current-month)))
- (if (and (<= next-month next-sign) (not had-leap-month))
- (progn;; leap month
- (setq month (+ month 0.5))
- (setq had-leap-month t))
- (setq month (floor (1+ month)))
- (setq next-sign (chinese-zodiac-sign-on-or-after (1+ next-sign)))))
- (list cycle year month (1+ (- date current-month)))))
-
-(defun chinese-new-year (year)
- "The absolute date of Chinese New Year in Gregorian YEAR."
- (let* ((last-solstice (chinese-zodiac-sign-on-or-after
- (calendar-absolute-from-gregorian
- (list 12 15 (1- year)))))
- (twelfth-new-moon;; twelfth month of previous year
- (chinese-new-moon-on-or-after (1+ last-solstice)))
- (thirteenth-new-moon;; maybe leap month, maybe New Year
- (chinese-new-moon-on-or-after (1+ twelfth-new-moon)))
- (fourteenth-new-moon;; maybe New Year, maybe second month
- (chinese-new-moon-on-or-after (1+ thirteenth-new-moon)))
- (next-solstice (chinese-zodiac-sign-on-or-after
- (calendar-absolute-from-gregorian (list 12 15 year))))
- (new-moons (+ 3 (calendar-sum m 0
- (< (chinese-new-moon-on-or-after
- (+ fourteenth-new-moon (* 29 m)))
- next-solstice)
- 1))))
- (if (and (= new-moons 14)
- (< (chinese-zodiac-sign-on-or-after
- (calendar-absolute-from-gregorian (list 2 15 year)))
- thirteenth-new-moon)
- (<= fourteenth-new-moon
- (chinese-zodiac-sign-on-or-after
- (calendar-absolute-from-gregorian (list 3 15 year)))))
- fourteeth-new-moon
- thirteenth-new-moon)))
+ (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."
(if (< m 5)
(let ((chinese-new-year
(calendar-gregorian-from-absolute
- (chinese-new-year y))))
+ (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-%s)"
- (aref chinese-calendar-celestial-stem
- (% (+ y 6) 10))
- (aref chinese-calendar-terrestrial-branch
- (% (+ y 8) 12))))))))))
+ (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.
(this-month (calendar-absolute-from-chinese
(list cycle year month 1)))
(next-month (calendar-absolute-from-chinese
- (list cycle year (1+ month) 1)))
- (month (floor month))
- (m-cycle (% (+ (* year 5) month) 60)))
- (format "Cycle %s, year %s (%s-%s), %smonth %s, day %s (%s-%s)"
+ (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
- (aref chinese-calendar-celestial-stem (% (+ year 9) 10))
- (aref chinese-calendar-terrestrial-branch (% (+ year 11) 12))
+ year (calendar-chinese-sexagesimal-name year)
(if (not (integerp month))
"second "
(if (< 30 (- next-month this-month))
"first "
""))
- month
- day
- (aref chinese-calendar-celestial-stem (% (+ a-date 4) 10))
- (aref chinese-calendar-terrestrial-branch (% (+ a-date 2) 12)))))
+ (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."
(calendar-absolute-from-gregorian
(calendar-current-date))))
(cycle (calendar-read
- "Cycle number (>44): "
+ "Chinese calendar cycle number (>44): "
'(lambda (x) (> x 44))
(int-to-string (car c))))
(year (calendar-read
- "Year in cycle (1..60): "
+ "Year in Chinese cycle (1..60): "
'(lambda (x) (and (<= 1 x) (<= x 60)))
(int-to-string (car (cdr c)))))
- (month (read-minibuffer "Month: "))
- (day (read-minibuffer "Day: ")))
+ (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-chinese)
+(provide 'cal-china)
-;;; cal-chinese ends here
+;;; arch-tag: 7e5b7e0d-676c-47e3-8696-93e7ea0ab644
+;;; cal-china.el ends here
HCoop / bpt / emacs.git / blobdiff