cal-hebrew.el

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1	;;; cal-hebrew.el --- calendar functions for the Hebrew calendar
2
3	;; Copyright (C) 1995, 1997, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008
4	;; Free Software Foundation, Inc.
5
6	;; Author: Nachum Dershowitz <nachum@cs.uiuc.edu>
7	;; Edward M. Reingold <reingold@cs.uiuc.edu>
8	;; Maintainer: Glenn Morris <rgm@gnu.org>
9	;; Keywords: calendar
10	;; Human-Keywords: Hebrew calendar, calendar, diary
11
12	;; This file is part of GNU Emacs.
13
14	;; GNU Emacs is free software; you can redistribute it and/or modify
15	;; it under the terms of the GNU General Public License as published by
16	;; the Free Software Foundation; either version 3, or (at your option)
17	;; any later version.
18
19	;; GNU Emacs is distributed in the hope that it will be useful,
20	;; but WITHOUT ANY WARRANTY; without even the implied warranty of
21	;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22	;; GNU General Public License for more details.
23
24	;; You should have received a copy of the GNU General Public License
25	;; along with GNU Emacs; see the file COPYING. If not, write to the
26	;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
27	;; Boston, MA 02110-1301, USA.
28
29	;;; Commentary:
30
31	;; This collection of functions implements the features of calendar.el and
32	;; diary.el that deal with the Hebrew calendar.
33
34	;; Technical details of all the calendrical calculations can be found in
35	;; ``Calendrical Calculations: The Millennium Edition'' by Edward M. Reingold
36	;; and Nachum Dershowitz, Cambridge University Press (2001).
37
38	;;; Code:
39
40	(defvar date)
41	(defvar displayed-month)
42	(defvar displayed-year)
43	(defvar entry)
44	(defvar number)
45	(defvar original-date)
46
47	(require 'calendar)
48
49	(defun hebrew-calendar-leap-year-p (year)
50	"t if YEAR is a Hebrew calendar leap year."
51	(< (% (1+ (* 7 year)) 19) 7))
52
53	(defun hebrew-calendar-last-month-of-year (year)
54	"The last month of the Hebrew calendar YEAR."
55	(if (hebrew-calendar-leap-year-p year)
56	13
57	12))
58
59	(defun hebrew-calendar-elapsed-days (year)
60	"Days from Sun. prior to start of Hebrew calendar to mean conjunction of Tishri of Hebrew YEAR."
61	(let* ((months-elapsed
62	(+ (* 235 (/ (1- year) 19));; Months in complete cycles so far.
63	(* 12 (% (1- year) 19)) ;; Regular months in this cycle
64	(/ (1+ (* 7 (% (1- year) 19))) 19)));; Leap months this cycle
65	(parts-elapsed (+ 204 (* 793 (% months-elapsed 1080))))
66	(hours-elapsed (+ 5
67	(* 12 months-elapsed)
68	(* 793 (/ months-elapsed 1080))
69	(/ parts-elapsed 1080)))
70	(parts ;; Conjunction parts
71	(+ (* 1080 (% hours-elapsed 24)) (% parts-elapsed 1080)))
72	(day ;; Conjunction day
73	(+ 1 (* 29 months-elapsed) (/ hours-elapsed 24)))
74	(alternative-day
75	(if (or (>= parts 19440) ;; If the new moon is at or after midday,
76	(and (= (% day 7) 2);; ...or is on a Tuesday...
77	(>= parts 9924) ;; at 9 hours, 204 parts or later...
78	(not (hebrew-calendar-leap-year-p year)));; of a
79	;; common year,
80	(and (= (% day 7) 1);; ...or is on a Monday...
81	(>= parts 16789) ;; at 15 hours, 589 parts or later...
82	(hebrew-calendar-leap-year-p (1- year))));; at the end
83	;; of a leap year
84	;; Then postpone Rosh HaShanah one day
85	(1+ day)
86	;; Else
87	day)))
88	(if ;; If Rosh HaShanah would occur on Sunday, Wednesday, or Friday
89	(memq (% alternative-day 7) (list 0 3 5))
90	;; Then postpone it one (more) day and return
91	(1+ alternative-day)
92	;; Else return
93	alternative-day)))
94
95	(defun hebrew-calendar-days-in-year (year)
96	"Number of days in Hebrew YEAR."
97	(- (hebrew-calendar-elapsed-days (1+ year))
98	(hebrew-calendar-elapsed-days year)))
99
100	(defun hebrew-calendar-long-heshvan-p (year)
101	"t if Heshvan is long in Hebrew YEAR."
102	(= (% (hebrew-calendar-days-in-year year) 10) 5))
103
104	(defun hebrew-calendar-short-kislev-p (year)
105	"t if Kislev is short in Hebrew YEAR."
106	(= (% (hebrew-calendar-days-in-year year) 10) 3))
107
108	(defun hebrew-calendar-last-day-of-month (month year)
109	"The last day of MONTH in YEAR."
110	(if (or (memq month (list 2 4 6 10 13))
111	(and (= month 12) (not (hebrew-calendar-leap-year-p year)))
112	(and (= month 8) (not (hebrew-calendar-long-heshvan-p year)))
113	(and (= month 9) (hebrew-calendar-short-kislev-p year)))
114	29
115	30))
116
117	(defun calendar-absolute-from-hebrew (date)
118	"Absolute date of Hebrew DATE.
119	The absolute date is the number of days elapsed since the (imaginary)
120	Gregorian date Sunday, December 31, 1 BC."
121	(let* ((month (extract-calendar-month date))
122	(day (extract-calendar-day date))
123	(year (extract-calendar-year date)))
124	(+ day ;; Days so far this month.
125	(if (< month 7);; before Tishri
126	;; Then add days in prior months this year before and after Nisan
127	(+ (calendar-sum
128	m 7 (<= m (hebrew-calendar-last-month-of-year year))
129	(hebrew-calendar-last-day-of-month m year))
130	(calendar-sum
131	m 1 (< m month)
132	(hebrew-calendar-last-day-of-month m year)))
133	;; Else add days in prior months this year
134	(calendar-sum
135	m 7 (< m month)
136	(hebrew-calendar-last-day-of-month m year)))
137	(hebrew-calendar-elapsed-days year);; Days in prior years.
138	-1373429))) ;; Days elapsed before absolute date 1.
139
140	(defun calendar-hebrew-from-absolute (date)
141	"Compute the Hebrew date (month day year) corresponding to absolute DATE.
142	The absolute date is the number of days elapsed since the (imaginary)
143	Gregorian date Sunday, December 31, 1 BC."
144	(let* ((greg-date (calendar-gregorian-from-absolute date))
145	(month (aref [9 10 11 12 1 2 3 4 7 7 7 8]
146	(1- (extract-calendar-month greg-date))))
147	(day)
148	(year (+ 3760 (extract-calendar-year greg-date))))
149	(while (>= date (calendar-absolute-from-hebrew (list 7 1 (1+ year))))
150	(setq year (1+ year)))
151	(let ((length (hebrew-calendar-last-month-of-year year)))
152	(while (> date
153	(calendar-absolute-from-hebrew
154	(list month
155	(hebrew-calendar-last-day-of-month month year)
156	year)))
157	(setq month (1+ (% month length)))))
158	(setq day (1+
159	(- date (calendar-absolute-from-hebrew (list month 1 year)))))
160	(list month day year)))
161
162	(defvar calendar-hebrew-month-name-array-common-year
163	["Nisan" "Iyar" "Sivan" "Tammuz" "Av" "Elul" "Tishri"
164	"Heshvan" "Kislev" "Teveth" "Shevat" "Adar"]
165	"Array of strings giving the names of the Hebrew months in a common year.")
166
167	(defvar calendar-hebrew-month-name-array-leap-year
168	["Nisan" "Iyar" "Sivan" "Tammuz" "Av" "Elul" "Tishri"
169	"Heshvan" "Kislev" "Teveth" "Shevat" "Adar I" "Adar II"]
170	"Array of strings giving the names of the Hebrew months in a leap year.")
171
172	(defun calendar-hebrew-date-string (&optional date)
173	"String of Hebrew date before sunset of Gregorian DATE.
174	Defaults to today's date if DATE is not given.
175	Driven by the variable `calendar-date-display-form'."
176	(let* ((hebrew-date (calendar-hebrew-from-absolute
177	(calendar-absolute-from-gregorian
178	(or date (calendar-current-date)))))
179	(calendar-month-name-array
180	(if (hebrew-calendar-leap-year-p (extract-calendar-year hebrew-date))
181	calendar-hebrew-month-name-array-leap-year
182	calendar-hebrew-month-name-array-common-year)))
183	(calendar-date-string hebrew-date nil t)))
184
185	(defun calendar-print-hebrew-date ()
186	"Show the Hebrew calendar equivalent of the date under the cursor."
187	(interactive)
188	(message "Hebrew date (until sunset): %s"
189	(calendar-hebrew-date-string (calendar-cursor-to-date t))))
190
191	(defun hebrew-calendar-yahrzeit (death-date year)
192	"Absolute date of the anniversary of Hebrew DEATH-DATE in Hebrew YEAR."
193	(let* ((death-day (extract-calendar-day death-date))
194	(death-month (extract-calendar-month death-date))
195	(death-year (extract-calendar-year death-date)))
196	(cond
197	;; If it's Heshvan 30 it depends on the first anniversary; if
198	;; that was not Heshvan 30, use the day before Kislev 1.
199	((and (= death-month 8)
200	(= death-day 30)
201	(not (hebrew-calendar-long-heshvan-p (1+ death-year))))
202	(1- (calendar-absolute-from-hebrew (list 9 1 year))))
203	;; If it's Kislev 30 it depends on the first anniversary; if
204	;; that was not Kislev 30, use the day before Teveth 1.
205	((and (= death-month 9)
206	(= death-day 30)
207	(hebrew-calendar-short-kislev-p (1+ death-year)))
208	(1- (calendar-absolute-from-hebrew (list 10 1 year))))
209	;; If it's Adar II, use the same day in last month of
210	;; year (Adar or Adar II).
211	((= death-month 13)
212	(calendar-absolute-from-hebrew
213	(list (hebrew-calendar-last-month-of-year year) death-day year)))
214	;; If it's the 30th in Adar I and year is not a leap year
215	;; (so Adar has only 29 days), use the last day in Shevat.
216	((and (= death-day 30)
217	(= death-month 12)
218	(not (hebrew-calendar-leap-year-p year)))
219	(calendar-absolute-from-hebrew (list 11 30 year)))
220	;; In all other cases, use the normal anniversary of the date of death.
221	(t (calendar-absolute-from-hebrew
222	(list death-month death-day year))))))
223
224	(defun calendar-goto-hebrew-date (date &optional noecho)
225	"Move cursor to Hebrew DATE; echo Hebrew date unless NOECHO is t."
226	(interactive
227	(let* ((today (calendar-current-date))
228	(year (calendar-read
229	"Hebrew calendar year (>3760): "
230	'(lambda (x) (> x 3760))
231	(int-to-string
232	(extract-calendar-year
233	(calendar-hebrew-from-absolute
234	(calendar-absolute-from-gregorian today))))))
235	(month-array (if (hebrew-calendar-leap-year-p year)
236	calendar-hebrew-month-name-array-leap-year
237	calendar-hebrew-month-name-array-common-year))
238	(completion-ignore-case t)
239	(month (cdr (assoc-string
240	(completing-read
241	"Hebrew calendar month name: "
242	(mapcar 'list (append month-array nil))
243	(if (= year 3761)
244	'(lambda (x)
245	(let ((m (cdr
246	(assoc-string
247	(car x)
248	(calendar-make-alist month-array)
249	t))))
250	(< 0
251	(calendar-absolute-from-hebrew
252	(list m
253	(hebrew-calendar-last-day-of-month
254	m year)
255	year))))))
256	t)
257	(calendar-make-alist month-array 1) t)))
258	(last (hebrew-calendar-last-day-of-month month year))
259	(first (if (and (= year 3761) (= month 10))
260	18 1))
261	(day (calendar-read
262	(format "Hebrew calendar day (%d-%d): "
263	first last)
264	'(lambda (x) (and (<= first x) (<= x last))))))
265	(list (list month day year))))
266	(calendar-goto-date (calendar-gregorian-from-absolute
267	(calendar-absolute-from-hebrew date)))
268	(or noecho (calendar-print-hebrew-date)))
269
270	(defun holiday-hebrew (month day string)
271	"Holiday on MONTH, DAY (Hebrew) called STRING.
272	If MONTH, DAY (Hebrew) is visible, the value returned is corresponding
273	Gregorian date in the form of the list (((month day year) STRING)). Returns
274	nil if it is not visible in the current calendar window."
275	(if (memq displayed-month;; This test is only to speed things up a bit;
276	(list ;; it works fine without the test too.
277	(if (< 11 month) (- month 11) (+ month 1))
278	(if (< 10 month) (- month 10) (+ month 2))
279	(if (< 9 month) (- month 9) (+ month 3))
280	(if (< 8 month) (- month 8) (+ month 4))
281	(if (< 7 month) (- month 7) (+ month 5))))
282	(let ((m1 displayed-month)
283	(y1 displayed-year)
284	(m2 displayed-month)
285	(y2 displayed-year)
286	(year))
287	(increment-calendar-month m1 y1 -1)
288	(increment-calendar-month m2 y2 1)
289	(let* ((start-date (calendar-absolute-from-gregorian
290	(list m1 1 y1)))
291	(end-date (calendar-absolute-from-gregorian
292	(list m2 (calendar-last-day-of-month m2 y2) y2)))
293	(hebrew-start (calendar-hebrew-from-absolute start-date))
294	(hebrew-end (calendar-hebrew-from-absolute end-date))
295	(hebrew-y1 (extract-calendar-year hebrew-start))
296	(hebrew-y2 (extract-calendar-year hebrew-end)))
297	(setq year (if (< 6 month) hebrew-y2 hebrew-y1))
298	(let ((date (calendar-gregorian-from-absolute
299	(calendar-absolute-from-hebrew
300	(list month day year)))))
301	(if (calendar-date-is-visible-p date)
302	(list (list date string))))))))
303
304	(defun holiday-rosh-hashanah-etc ()
305	"List of dates related to Rosh Hashanah, as visible in calendar window."
306	(if (or (< displayed-month 8)
307	(> displayed-month 11))
308	nil;; None of the dates is visible
309	(let* ((abs-r-h (calendar-absolute-from-hebrew
310	(list 7 1 (+ displayed-year 3761))))
311	(mandatory
312	(list
313	(list (calendar-gregorian-from-absolute abs-r-h)
314	(format "Rosh HaShanah %d" (+ 3761 displayed-year)))
315	(list (calendar-gregorian-from-absolute (+ abs-r-h 9))
316	"Yom Kippur")
317	(list (calendar-gregorian-from-absolute (+ abs-r-h 14))
318	"Sukkot")
319	(list (calendar-gregorian-from-absolute (+ abs-r-h 21))
320	"Shemini Atzeret")
321	(list (calendar-gregorian-from-absolute (+ abs-r-h 22))
322	"Simchat Torah")))
323	(optional
324	(list
325	(list (calendar-gregorian-from-absolute
326	(calendar-dayname-on-or-before 6 (- abs-r-h 4)))
327	"Selichot (night)")
328	(list (calendar-gregorian-from-absolute (1- abs-r-h))
329	"Erev Rosh HaShanah")
330	(list (calendar-gregorian-from-absolute (1+ abs-r-h))
331	"Rosh HaShanah (second day)")
332	(list (calendar-gregorian-from-absolute
333	(if (= (% abs-r-h 7) 4) (+ abs-r-h 3) (+ abs-r-h 2)))
334	"Tzom Gedaliah")
335	(list (calendar-gregorian-from-absolute
336	(calendar-dayname-on-or-before 6 (+ 7 abs-r-h)))
337	"Shabbat Shuvah")
338	(list (calendar-gregorian-from-absolute (+ abs-r-h 8))
339	"Erev Yom Kippur")
340	(list (calendar-gregorian-from-absolute (+ abs-r-h 13))
341	"Erev Sukkot")
342	(list (calendar-gregorian-from-absolute (+ abs-r-h 15))
343	"Sukkot (second day)")
344	(list (calendar-gregorian-from-absolute (+ abs-r-h 16))
345	"Hol Hamoed Sukkot (first day)")
346	(list (calendar-gregorian-from-absolute (+ abs-r-h 17))
347	"Hol Hamoed Sukkot (second day)")
348	(list (calendar-gregorian-from-absolute (+ abs-r-h 18))
349	"Hol Hamoed Sukkot (third day)")
350	(list (calendar-gregorian-from-absolute (+ abs-r-h 19))
351	"Hol Hamoed Sukkot (fourth day)")
352	(list (calendar-gregorian-from-absolute (+ abs-r-h 20))
353	"Hoshanah Rabbah")))
354	(output-list
355	(filter-visible-calendar-holidays mandatory)))
356	(if all-hebrew-calendar-holidays
357	(setq output-list
358	(append
359	(filter-visible-calendar-holidays optional)
360	output-list)))
361	output-list)))
362
363	(defun holiday-hanukkah ()
364	"List of dates related to Hanukkah, as visible in calendar window."
365	(if (memq displayed-month;; This test is only to speed things up a bit;
366	'(10 11 12 1 2));; it works fine without the test too.
367	(let ((m displayed-month)
368	(y displayed-year))
369	(increment-calendar-month m y 1)
370	(let* ((h-y (extract-calendar-year
371	(calendar-hebrew-from-absolute
372	(calendar-absolute-from-gregorian
373	(list m (calendar-last-day-of-month m y) y)))))
374	(abs-h (calendar-absolute-from-hebrew (list 9 25 h-y))))
375	(filter-visible-calendar-holidays
376	(list
377	(list (calendar-gregorian-from-absolute (1- abs-h))
378	"Erev Hanukkah")
379	(list (calendar-gregorian-from-absolute abs-h)
380	"Hanukkah (first day)")
381	(list (calendar-gregorian-from-absolute (1+ abs-h))
382	"Hanukkah (second day)")
383	(list (calendar-gregorian-from-absolute (+ abs-h 2))
384	"Hanukkah (third day)")
385	(list (calendar-gregorian-from-absolute (+ abs-h 3))
386	"Hanukkah (fourth day)")
387	(list (calendar-gregorian-from-absolute (+ abs-h 4))
388	"Hanukkah (fifth day)")
389	(list (calendar-gregorian-from-absolute (+ abs-h 5))
390	"Hanukkah (sixth day)")
391	(list (calendar-gregorian-from-absolute (+ abs-h 6))
392	"Hanukkah (seventh day)")
393	(list (calendar-gregorian-from-absolute (+ abs-h 7))
394	"Hanukkah (eighth day)")))))))
395
396	(defun holiday-passover-etc ()
397	"List of dates related to Passover, as visible in calendar window."
398	(if (< 7 displayed-month)
399	nil;; None of the dates is visible
400	(let* ((abs-p (calendar-absolute-from-hebrew
401	(list 1 15 (+ displayed-year 3760))))
402	(mandatory
403	(list
404	(list (calendar-gregorian-from-absolute abs-p)
405	"Passover")
406	(list (calendar-gregorian-from-absolute (+ abs-p 50))
407	"Shavuot")))
408	(optional
409	(list
410	(list (calendar-gregorian-from-absolute
411	(calendar-dayname-on-or-before 6 (- abs-p 43)))
412	"Shabbat Shekalim")
413	(list (calendar-gregorian-from-absolute
414	(calendar-dayname-on-or-before 6 (- abs-p 30)))
415	"Shabbat Zachor")
416	(list (calendar-gregorian-from-absolute
417	(if (= (% abs-p 7) 2) (- abs-p 33) (- abs-p 31)))
418	"Fast of Esther")
419	(list (calendar-gregorian-from-absolute (- abs-p 31))
420	"Erev Purim")
421	(list (calendar-gregorian-from-absolute (- abs-p 30))
422	"Purim")
423	(list (calendar-gregorian-from-absolute
424	(if (zerop (% abs-p 7)) (- abs-p 28) (- abs-p 29)))
425	"Shushan Purim")
426	(list (calendar-gregorian-from-absolute
427	(- (calendar-dayname-on-or-before 6 (- abs-p 14)) 7))
428	"Shabbat Parah")
429	(list (calendar-gregorian-from-absolute
430	(calendar-dayname-on-or-before 6 (- abs-p 14)))
431	"Shabbat HaHodesh")
432	(list (calendar-gregorian-from-absolute
433	(calendar-dayname-on-or-before 6 (1- abs-p)))
434	"Shabbat HaGadol")
435	(list (calendar-gregorian-from-absolute (1- abs-p))
436	"Erev Passover")
437	(list (calendar-gregorian-from-absolute (1+ abs-p))
438	"Passover (second day)")
439	(list (calendar-gregorian-from-absolute (+ abs-p 2))
440	"Hol Hamoed Passover (first day)")
441	(list (calendar-gregorian-from-absolute (+ abs-p 3))
442	"Hol Hamoed Passover (second day)")
443	(list (calendar-gregorian-from-absolute (+ abs-p 4))
444	"Hol Hamoed Passover (third day)")
445	(list (calendar-gregorian-from-absolute (+ abs-p 5))
446	"Hol Hamoed Passover (fourth day)")
447	(list (calendar-gregorian-from-absolute (+ abs-p 6))
448	"Passover (seventh day)")
449	(list (calendar-gregorian-from-absolute (+ abs-p 7))
450	"Passover (eighth day)")
451	(list (calendar-gregorian-from-absolute
452	(if (zerop (% (+ abs-p 12) 7))
453	(+ abs-p 13)
454	(+ abs-p 12)))
455	"Yom HaShoah")
456	(list (calendar-gregorian-from-absolute
457	(if (zerop (% abs-p 7))
458	(+ abs-p 18)
459	(if (= (% abs-p 7) 6)
460	(+ abs-p 19)
461	(+ abs-p 20))))
462	"Yom HaAtzma'ut")
463	(list (calendar-gregorian-from-absolute (+ abs-p 33))
464	"Lag BaOmer")
465	(list (calendar-gregorian-from-absolute (+ abs-p 43))
466	"Yom Yerushalaim")
467	(list (calendar-gregorian-from-absolute (+ abs-p 49))
468	"Erev Shavuot")
469	(list (calendar-gregorian-from-absolute (+ abs-p 51))
470	"Shavuot (second day)")))
471	(output-list
472	(filter-visible-calendar-holidays mandatory)))
473	(if all-hebrew-calendar-holidays
474	(setq output-list
475	(append
476	(filter-visible-calendar-holidays optional)
477	output-list)))
478	output-list)))
479
480	(defun holiday-tisha-b-av-etc ()
481	"List of dates around Tisha B'Av, as visible in calendar window."
482	(if (or (< displayed-month 5)
483	(> displayed-month 9))
484	nil;; None of the dates is visible
485	(let* ((abs-t-a (calendar-absolute-from-hebrew
486	(list 5 9 (+ displayed-year 3760)))))
487
488	(filter-visible-calendar-holidays
489	(list
490	(list (calendar-gregorian-from-absolute
491	(if (= (% abs-t-a 7) 6) (- abs-t-a 20) (- abs-t-a 21)))
492	"Tzom Tammuz")
493	(list (calendar-gregorian-from-absolute
494	(calendar-dayname-on-or-before 6 abs-t-a))
495	"Shabbat Hazon")
496	(list (calendar-gregorian-from-absolute
497	(if (= (% abs-t-a 7) 6) (1+ abs-t-a) abs-t-a))
498	"Tisha B'Av")
499	(list (calendar-gregorian-from-absolute
500	(calendar-dayname-on-or-before 6 (+ abs-t-a 7)))
501	"Shabbat Nahamu"))))))
502
503	(defun list-hebrew-diary-entries ()
504	"Add any Hebrew date entries from the diary file to `diary-entries-list'.
505	Hebrew date diary entries must be prefaced by `hebrew-diary-entry-symbol'
506	\(normally an `H'). The same diary date forms govern the style of the Hebrew
507	calendar entries, except that the Hebrew month names must be spelled in full.
508	The Hebrew months are numbered from 1 to 13 with Nisan being 1, 12 being
509	Adar I and 13 being Adar II; you must use `Adar I' if you want Adar of a
510	common Hebrew year. If a Hebrew date diary entry begins with a
511	`diary-nonmarking-symbol', the entry will appear in the diary listing, but will
512	not be marked in the calendar. This function is provided for use with the
513	`nongregorian-diary-listing-hook'."
514	(if (< 0 number)
515	(let ((buffer-read-only nil)
516	(diary-modified (buffer-modified-p))
517	(gdate original-date)
518	(mark (regexp-quote diary-nonmarking-symbol)))
519	(calendar-for-loop i from 1 to number do
520	(let* ((d diary-date-forms)
521	(hdate (calendar-hebrew-from-absolute
522	(calendar-absolute-from-gregorian gdate)))
523	(month (extract-calendar-month hdate))
524	(day (extract-calendar-day hdate))
525	(year (extract-calendar-year hdate)))
526	(while d
527	(let*
528	((date-form (if (equal (car (car d)) 'backup)
529	(cdr (car d))
530	(car d)))
531	(backup (equal (car (car d)) 'backup))
532	(dayname
533	(format "%s\\\|%s\\.?"
534	(calendar-day-name gdate)
535	(calendar-day-name gdate 'abbrev)))
536	(calendar-month-name-array
537	calendar-hebrew-month-name-array-leap-year)
538	(monthname
539	(concat
540	*"\\\\\|"**
541	(calendar-month-name month)))
542	(month (concat *"\\\\\|0"* (int-to-string month)))
543	(day (concat *"\\\\\|0"* (int-to-string day)))
544	(year
545	(concat
546	*"\\\\\|0"* (int-to-string year)
547	(if abbreviated-calendar-year
548	(concat "\\\|" (int-to-string (% year 100)))
549	"")))
550	(regexp
551	(concat
552	"\\(\\`\\\|\^M\\\|\n\\)" mark "?"
553	(regexp-quote hebrew-diary-entry-symbol)
554	"\\("
555	(mapconcat 'eval date-form "\\)\\(")
556	"\\)"))
557	(case-fold-search t))
558	(goto-char (point-min))
559	(while (re-search-forward regexp nil t)
560	(if backup (re-search-backward "\\<" nil t))
561	(if (and (or (char-equal (preceding-char) ?\^M)
562	(char-equal (preceding-char) ?\n))
563	(not (looking-at " \\\|\^I")))
564	;; Diary entry that consists only of date.
565	(backward-char 1)
566	;; Found a nonempty diary entry--make it visible and
567	;; add it to the list.
568	(let ((entry-start (point))
569	(date-start))
570	(re-search-backward "\^M\\\|\n\\\|\\`")
571	(setq date-start (point))
572	(re-search-forward "\^M\\\|\n" nil t 2)
573	(while (looking-at " \\\|\^I")
574	(re-search-forward "\^M\\\|\n" nil t))
575	(backward-char 1)
576	(subst-char-in-region date-start (point) ?\^M ?\n t)
577	(add-to-diary-list
578	gdate
579	(buffer-substring-no-properties entry-start (point))
580	(buffer-substring-no-properties
581	(1+ date-start) (1- entry-start))
582	(copy-marker entry-start))))))
583	(setq d (cdr d))))
584	(setq gdate
585	(calendar-gregorian-from-absolute
586	(1+ (calendar-absolute-from-gregorian gdate)))))
587	(set-buffer-modified-p diary-modified))
588	(goto-char (point-min))))
589
590	(defun mark-hebrew-calendar-date-pattern (month day year)
591	"Mark dates in calendar window that conform to Hebrew date MONTH/DAY/YEAR.
592	A value of 0 in any position is a wildcard."
593	(save-excursion
594	(set-buffer calendar-buffer)
595	(if (and (/= 0 month) (/= 0 day))
596	(if (/= 0 year)
597	;; Fully specified Hebrew date.
598	(let ((date (calendar-gregorian-from-absolute
599	(calendar-absolute-from-hebrew
600	(list month day year)))))
601	(if (calendar-date-is-visible-p date)
602	(mark-visible-calendar-date date)))
603	;; Month and day in any year--this taken from the holiday stuff.
604	(if (memq displayed-month;; This test is only to speed things up a
605	(list ;; bit; it works fine without the test too.
606	(if (< 11 month) (- month 11) (+ month 1))
607	(if (< 10 month) (- month 10) (+ month 2))
608	(if (< 9 month) (- month 9) (+ month 3))
609	(if (< 8 month) (- month 8) (+ month 4))
610	(if (< 7 month) (- month 7) (+ month 5))))
611	(let ((m1 displayed-month)
612	(y1 displayed-year)
613	(m2 displayed-month)
614	(y2 displayed-year)
615	(year))
616	(increment-calendar-month m1 y1 -1)
617	(increment-calendar-month m2 y2 1)
618	(let* ((start-date (calendar-absolute-from-gregorian
619	(list m1 1 y1)))
620	(end-date (calendar-absolute-from-gregorian
621	(list m2
622	(calendar-last-day-of-month m2 y2)
623	y2)))
624	(hebrew-start
625	(calendar-hebrew-from-absolute start-date))
626	(hebrew-end (calendar-hebrew-from-absolute end-date))
627	(hebrew-y1 (extract-calendar-year hebrew-start))
628	(hebrew-y2 (extract-calendar-year hebrew-end)))
629	(setq year (if (< 6 month) hebrew-y2 hebrew-y1))
630	(let ((date (calendar-gregorian-from-absolute
631	(calendar-absolute-from-hebrew
632	(list month day year)))))
633	(if (calendar-date-is-visible-p date)
634	(mark-visible-calendar-date date)))))))
635	;; Not one of the simple cases--check all visible dates for match.
636	;; Actually, the following code takes care of ALL of the cases, but
637	;; it's much too slow to be used for the simple (common) cases.
638	(let ((m displayed-month)
639	(y displayed-year)
640	(first-date)
641	(last-date))
642	(increment-calendar-month m y -1)
643	(setq first-date
644	(calendar-absolute-from-gregorian
645	(list m 1 y)))
646	(increment-calendar-month m y 2)
647	(setq last-date
648	(calendar-absolute-from-gregorian
649	(list m (calendar-last-day-of-month m y) y)))
650	(calendar-for-loop date from first-date to last-date do
651	(let* ((h-date (calendar-hebrew-from-absolute date))
652	(h-month (extract-calendar-month h-date))
653	(h-day (extract-calendar-day h-date))
654	(h-year (extract-calendar-year h-date)))
655	(and (or (zerop month)
656	(= month h-month))
657	(or (zerop day)
658	(= day h-day))
659	(or (zerop year)
660	(= year h-year))
661	(mark-visible-calendar-date
662	(calendar-gregorian-from-absolute date)))))))))
663
664	(defun mark-hebrew-diary-entries ()
665	"Mark days in the calendar window that have Hebrew date diary entries.
666	Each entry in diary-file (or included files) visible in the calendar window
667	is marked. Hebrew date entries are prefaced by a hebrew-diary-entry-symbol
668	\(normally an `H'). The same diary-date-forms govern the style of the Hebrew
669	calendar entries, except that the Hebrew month names must be spelled in full.
670	The Hebrew months are numbered from 1 to 13 with Nisan being 1, 12 being
671	Adar I and 13 being Adar II; you must use `Adar I' if you want Adar of a
672	common Hebrew year. Hebrew date diary entries that begin with a
673	diary-nonmarking symbol will not be marked in the calendar. This function
674	is provided for use as part of the nongregorian-diary-marking-hook."
675	(let ((d diary-date-forms))
676	(while d
677	(let*
678	((date-form (if (equal (car (car d)) 'backup)
679	(cdr (car d))
680	(car d)));; ignore 'backup directive
681	(dayname (diary-name-pattern calendar-day-name-array
682	calendar-day-abbrev-array))
683	(monthname
684	(format *"%s\\\|\\"**
685	(diary-name-pattern
686	calendar-hebrew-month-name-array-leap-year)))
687	(month *"[0-9]+\\\|\\"**)
688	(day *"[0-9]+\\\|\\"**)
689	(year *"[0-9]+\\\|\\"**)
690	(l (length date-form))
691	(d-name-pos (- l (length (memq 'dayname date-form))))
692	(d-name-pos (if (/= l d-name-pos) (+ 2 d-name-pos)))
693	(m-name-pos (- l (length (memq 'monthname date-form))))
694	(m-name-pos (if (/= l m-name-pos) (+ 2 m-name-pos)))
695	(d-pos (- l (length (memq 'day date-form))))
696	(d-pos (if (/= l d-pos) (+ 2 d-pos)))
697	(m-pos (- l (length (memq 'month date-form))))
698	(m-pos (if (/= l m-pos) (+ 2 m-pos)))
699	(y-pos (- l (length (memq 'year date-form))))
700	(y-pos (if (/= l y-pos) (+ 2 y-pos)))
701	(regexp
702	(concat
703	"\\(\\`\\\|\^M\\\|\n\\)"
704	(regexp-quote hebrew-diary-entry-symbol)
705	"\\("
706	(mapconcat 'eval date-form "\\)\\(")
707	"\\)"))
708	(case-fold-search t))
709	(goto-char (point-min))
710	(while (re-search-forward regexp nil t)
711	(let* ((dd-name
712	(if d-name-pos
713	(buffer-substring
714	(match-beginning d-name-pos)
715	(match-end d-name-pos))))
716	(mm-name
717	(if m-name-pos
718	(buffer-substring
719	(match-beginning m-name-pos)
720	(match-end m-name-pos))))
721	(mm (string-to-number
722	(if m-pos
723	(buffer-substring
724	(match-beginning m-pos)
725	(match-end m-pos))
726	"")))
727	(dd (string-to-number
728	(if d-pos
729	(buffer-substring
730	(match-beginning d-pos)
731	(match-end d-pos))