lisp/calendar/cal-hebrew.el

   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))
 732                         "")))
 733                  (y-str (if y-pos
 734                             (buffer-substring
 735                              (match-beginning y-pos)
 736                              (match-end y-pos))))
 737                  (yy (if (not y-str)
 738                          0
 739                        (if (and (= (length y-str) 2)
 740                                 abbreviated-calendar-year)
 741                            (let* ((current-y
 742                                    (extract-calendar-year
 743                                     (calendar-hebrew-from-absolute
 744                                      (calendar-absolute-from-gregorian
 745                                       (calendar-current-date)))))
 746                                   (y (+ (string-to-number y-str)
 747                                         (* 100 (/ current-y 100)))))
 748                              (if (> (- y current-y) 50)
 749                                  (- y 100)
 750                                (if (> (- current-y y) 50)
 751                                    (+ y 100)
 752                                  y)))
 753                          (string-to-number y-str)))))
 754             (if dd-name
 755                 (mark-calendar-days-named
 756                  (cdr (assoc-string dd-name
 757                                          (calendar-make-alist
 758                                           calendar-day-name-array
 759                                           0 nil calendar-day-abbrev-array) t)))
 760               (if mm-name
 761                   (setq mm
 762                         (if (string-equal mm-name "*") 0
 763                           (cdr
 764                            (assoc-string
 765                             mm-name
 766                             (calendar-make-alist
 767                              calendar-hebrew-month-name-array-leap-year) t)))))
 768               (mark-hebrew-calendar-date-pattern mm dd yy)))))
 769       (setq d (cdr d)))))
 770
 771 (defun insert-hebrew-diary-entry (arg)
 772   "Insert a diary entry.
 773 For the Hebrew date corresponding to the date indicated by point.
 774 Prefix arg will make the entry nonmarking."
 775   (interactive "P")
 776   (let* ((calendar-month-name-array
 777           calendar-hebrew-month-name-array-leap-year))
 778     (make-diary-entry
 779      (concat
 780       hebrew-diary-entry-symbol
 781       (calendar-date-string
 782        (calendar-hebrew-from-absolute
 783         (calendar-absolute-from-gregorian
 784          (calendar-cursor-to-date t)))
 785        nil t))
 786      arg)))
 787
 788 (defun insert-monthly-hebrew-diary-entry (arg)
 789   "Insert a monthly diary entry.
 790 For the day of the Hebrew month corresponding to the date indicated by point.
 791 Prefix arg will make the entry nonmarking."
 792   (interactive "P")
 793   (let* ((calendar-date-display-form
 794           (if european-calendar-style '(day " * ") '("* " day )))
 795          (calendar-month-name-array
 796           calendar-hebrew-month-name-array-leap-year))
 797     (make-diary-entry
 798      (concat
 799       hebrew-diary-entry-symbol
 800       (calendar-date-string
 801        (calendar-hebrew-from-absolute
 802         (calendar-absolute-from-gregorian
 803          (calendar-cursor-to-date t)))))
 804      arg)))
 805
 806 (defun insert-yearly-hebrew-diary-entry (arg)
 807   "Insert an annual diary entry.
 808 For the day of the Hebrew year corresponding to the date indicated by point.
 809 Prefix arg will make the entry nonmarking."
 810   (interactive "P")
 811   (let* ((calendar-date-display-form
 812           (if european-calendar-style
 813               '(day " " monthname)
 814             '(monthname " " day)))
 815          (calendar-month-name-array
 816           calendar-hebrew-month-name-array-leap-year))
 817     (make-diary-entry
 818      (concat
 819       hebrew-diary-entry-symbol
 820       (calendar-date-string
 821        (calendar-hebrew-from-absolute
 822         (calendar-absolute-from-gregorian
 823          (calendar-cursor-to-date t)))))
 824      arg)))
 825
 826 ;;;###autoload
 827 (defun list-yahrzeit-dates (death-date start-year end-year)
 828   "List Yahrzeit dates for *Gregorian* DEATH-DATE from START-YEAR to END-YEAR.
 829 When called interactively from the calendar window, the date of death is taken
 830 from the cursor position."
 831   (interactive
 832    (let* ((death-date
 833            (if (equal (current-buffer) (get-buffer calendar-buffer))
 834                (calendar-cursor-to-date)
 835              (let* ((today (calendar-current-date))
 836                     (year (calendar-read
 837                            "Year of death (>0): "
 838                            '(lambda (x) (> x 0))
 839                            (int-to-string (extract-calendar-year today))))
 840                     (month-array calendar-month-name-array)
 841                     (completion-ignore-case t)
 842                     (month (cdr (assoc-string
 843                                  (completing-read
 844                                   "Month of death (name): "
 845                                   (mapcar 'list (append month-array nil))
 846                                   nil t)
 847                                  (calendar-make-alist month-array 1) t)))
 848                     (last (calendar-last-day-of-month month year))
 849                     (day (calendar-read
 850                           (format "Day of death (1-%d): " last)
 851                           '(lambda (x) (and (< 0 x) (<= x last))))))
 852                (list month day year))))
 853           (death-year (extract-calendar-year death-date))
 854           (start-year (calendar-read
 855                        (format "Starting year of Yahrzeit table (>%d): "
 856                                death-year)
 857                        '(lambda (x) (> x death-year))
 858                        (int-to-string (1+ death-year))))
 859           (end-year (calendar-read
 860                      (format "Ending year of Yahrzeit table (>=%d): "
 861                              start-year)
 862                        '(lambda (x) (>= x start-year)))))
 863    (list death-date start-year end-year)))
 864   (message "Computing yahrzeits...")
 865   (let* ((yahrzeit-buffer "*Yahrzeits*")
 866          (h-date (calendar-hebrew-from-absolute
 867                   (calendar-absolute-from-gregorian death-date)))
 868          (h-month (extract-calendar-month h-date))
 869          (h-day (extract-calendar-day h-date))
 870          (h-year (extract-calendar-year h-date)))
 871     (set-buffer (get-buffer-create yahrzeit-buffer))
 872     (setq buffer-read-only nil)
 873     (calendar-set-mode-line
 874      (format "Yahrzeit dates for %s = %s"
 875              (calendar-date-string death-date)
 876              (let ((calendar-month-name-array
 877                     (if (hebrew-calendar-leap-year-p h-year)
 878                         calendar-hebrew-month-name-array-leap-year
 879                       calendar-hebrew-month-name-array-common-year)))
 880                (calendar-date-string h-date nil t))))
 881     (erase-buffer)
 882     (goto-char (point-min))
 883     (calendar-for-loop i from start-year to end-year do
 884         (insert
 885          (calendar-date-string
 886           (calendar-gregorian-from-absolute
 887            (hebrew-calendar-yahrzeit
 888             h-date
 889             (extract-calendar-year
 890              (calendar-hebrew-from-absolute
 891               (calendar-absolute-from-gregorian (list 1 1 i))))))) "\n"))
 892     (goto-char (point-min))
 893     (set-buffer-modified-p nil)
 894     (setq buffer-read-only t)
 895     (display-buffer yahrzeit-buffer)
 896     (message "Computing yahrzeits...done")))
 897
 898 (defun diary-hebrew-date ()
 899   "Hebrew calendar equivalent of date diary entry."
 900   (format "Hebrew date (until sunset): %s" (calendar-hebrew-date-string date)))
 901
 902 (defun diary-omer (&optional mark)
 903   "Omer count diary entry.
 904 Entry applies if date is within 50 days after Passover.
 905
 906 An optional parameter MARK specifies a face or single-character string to
 907 use when highlighting the day in the calendar."
 908   (let* ((passover
 909           (calendar-absolute-from-hebrew
 910            (list 1 15 (+ (extract-calendar-year date) 3760))))
 911          (omer (- (calendar-absolute-from-gregorian date) passover))
 912          (week (/ omer 7))
 913          (day (% omer 7)))
 914     (if (and (> omer 0) (< omer 50))
 915         (cons mark
 916               (format "Day %d%s of the omer (until sunset)"
 917                       omer
 918                       (if (zerop week)
 919                           ""
 920                         (format ", that is, %d week%s%s"
 921                                 week
 922                                 (if (= week 1) "" "s")
 923                                 (if (zerop day)
 924                                     ""
 925                                   (format " and %d day%s"
 926                                           day (if (= day 1) "" "s"))))))))))
 927
 928 (defun diary-yahrzeit (death-month death-day death-year &optional mark)
 929   "Yahrzeit diary entry--entry applies if date is yahrzeit or the day before.
 930 Parameters are DEATH-MONTH, DEATH-DAY, DEATH-YEAR; the diary entry is assumed
 931 to be the name of the person.  Date of death is on the *civil* calendar;
 932 although the date of death is specified by the civil calendar, the proper
 933 Hebrew calendar yahrzeit is determined.  If `european-calendar-style' is t, the
 934 order of the parameters is changed to DEATH-DAY, DEATH-MONTH, DEATH-YEAR.
 935
 936 An optional parameter MARK specifies a face or single-character string to
 937 use when highlighting the day in the calendar."
 938   (let* ((h-date (calendar-hebrew-from-absolute
 939                   (calendar-absolute-from-gregorian
 940                    (if european-calendar-style
 941                        (list death-day death-month death-year)
 942                      (list death-month death-day death-year)))))
 943          (h-month (extract-calendar-month h-date))
 944          (h-day (extract-calendar-day h-date))
 945          (h-year (extract-calendar-year h-date))
 946          (d (calendar-absolute-from-gregorian date))
 947          (yr (extract-calendar-year (calendar-hebrew-from-absolute d)))
 948          (diff (- yr h-year))
 949          (y (hebrew-calendar-yahrzeit h-date yr)))
 950     (if (and (> diff 0) (or (= y d) (= y (1+ d))))
 951         (cons mark
 952               (format "Yahrzeit of %s%s: %d%s anniversary"
 953                       entry
 954                       (if (= y d) "" " (evening)")
 955                       diff
 956                       (cond ((= (% diff 10) 1) "st")
 957                             ((= (% diff 10) 2) "nd")
 958                             ((= (% diff 10) 3) "rd")
 959                             (t "th")))))))
 960
 961 (defun diary-rosh-hodesh (&optional mark)
 962   "Rosh Hodesh diary entry.
 963 Entry applies if date is Rosh Hodesh, the day before, or the Saturday before.
 964
 965 An optional parameter MARK specifies a face or single-character string to
 966 use when highlighting the day in the calendar."
 967   (let* ((d (calendar-absolute-from-gregorian date))
 968          (h-date (calendar-hebrew-from-absolute d))
 969          (h-month (extract-calendar-month h-date))
 970          (h-day (extract-calendar-day h-date))
 971          (h-year (extract-calendar-year h-date))
 972          (leap-year (hebrew-calendar-leap-year-p h-year))
 973          (last-day (hebrew-calendar-last-day-of-month h-month h-year))
 974          (h-month-names
 975           (if leap-year
 976               calendar-hebrew-month-name-array-leap-year
 977             calendar-hebrew-month-name-array-common-year))
 978          (this-month (aref h-month-names (1- h-month)))
 979          (h-yesterday (extract-calendar-day
 980                        (calendar-hebrew-from-absolute (1- d)))))
 981     (if (or (= h-day 30) (and (= h-day 1) (/= h-month 7)))
 982         (cons mark
 983               (format
 984                "Rosh Hodesh %s"
 985                (if (= h-day 30)
 986                    (format
 987                     "%s (first day)"
 988                     ;; next month must be in the same year since this
 989                     ;; month can't be the last month of the year since
 990                     ;; it has 30 days
 991                     (aref h-month-names h-month))
 992                  (if (= h-yesterday 30)
 993                      (format "%s (second day)" this-month)
 994                    this-month))))
 995       (if (= (% d 7) 6) ;; Saturday--check for Shabbat Mevarchim
 996           (cons mark
 997                 (cond ((and (> h-day 22) (/= h-month 6) (= 29 last-day))
 998                        (format "Mevarchim Rosh Hodesh %s (%s)"
 999                                (aref h-month-names
1000                                      (if (= h-month
1001                                             (hebrew-calendar-last-month-of-year
1002                                              h-year))
1003                                          0 h-month))
1004                                (aref calendar-day-name-array (- 29 h-day))))
1005                       ((and (< h-day 30) (> h-day 22) (= 30 last-day))
1006                        (format "Mevarchim Rosh Hodesh %s (%s-%s)"
1007                                (aref h-month-names h-month)
1008                                (if (= h-day 29)
1009                                    "tomorrow"
1010                                  (aref calendar-day-name-array (- 29 h-day)))
1011                                (aref calendar-day-name-array
1012                                      (% (- 30 h-day) 7))))))
1013         (if (and (= h-day 29) (/= h-month 6))
1014             (cons mark
1015                   (format "Erev Rosh Hodesh %s"
1016                           (aref h-month-names
1017                                 (if (= h-month
1018                                        (hebrew-calendar-last-month-of-year
1019                                         h-year))
1020                                     0 h-month)))))))))
1021
1022 (defvar hebrew-calendar-parashiot-names
1023 ["Bereshith"   "Noah"      "Lech L'cha" "Vayera"    "Hayei Sarah" "Toledoth"
1024  "Vayetze"     "Vayishlah" "Vayeshev"   "Mikketz"   "Vayiggash"   "Vayhi"
1025  "Shemoth"     "Vaera"     "Bo"         "Beshallah" "Yithro"      "Mishpatim"
1026  "Terumah"     "Tetzavveh" "Ki Tissa"   "Vayakhel"  "Pekudei"     "Vayikra"
1027  "Tzav"        "Shemini"   "Tazria"     "Metzora"   "Aharei Moth" "Kedoshim"
1028  "Emor"        "Behar"     "Behukkotai" "Bemidbar"  "Naso"       "Behaalot'cha"
1029  "Shelah L'cha" "Korah"    "Hukkath"    "Balak"     "Pinhas"      "Mattoth"
1030  "Masei"       "Devarim"   "Vaethanan"  "Ekev"      "Reeh"        "Shofetim"
1031  "Ki Tetze"    "Ki Tavo"   "Nitzavim"   "Vayelech"  "Haazinu"]
1032   "The names of the parashiot in the Torah.")
1033
1034 (defun hebrew-calendar-parasha-name (p)
1035   "Name(s) corresponding to parasha P."
1036   (if (arrayp p);; combined parasha
1037       (format "%s/%s"
1038               (aref hebrew-calendar-parashiot-names (aref p 0))
1039               (aref hebrew-calendar-parashiot-names (aref p 1)))
1040     (aref hebrew-calendar-parashiot-names p)))
1041
1042 (defun diary-parasha (&optional mark)
1043   "Parasha diary entry--entry applies if date is a Saturday.
1044
1045 An optional parameter MARK specifies a face or single-character string to
1046 use when highlighting the day in the calendar."
1047   (let ((d (calendar-absolute-from-gregorian date)))
1048     (if (= (% d 7) 6) ;;  Saturday
1049         (let*
1050             ((h-year (extract-calendar-year
1051                       (calendar-hebrew-from-absolute d)))
1052              (rosh-hashanah
1053               (calendar-absolute-from-hebrew (list 7 1 h-year)))
1054              (passover
1055               (calendar-absolute-from-hebrew (list 1 15 h-year)))
1056              (rosh-hashanah-day
1057               (aref calendar-day-name-array (% rosh-hashanah 7)))
1058              (passover-day
1059               (aref calendar-day-name-array (% passover 7)))
1060              (long-h (hebrew-calendar-long-heshvan-p h-year))
1061              (short-k (hebrew-calendar-short-kislev-p h-year))
1062              (type (cond ((and long-h (not short-k)) "complete")
1063                          ((and (not long-h) short-k) "incomplete")
1064                          (t "regular")))
1065              (year-format
1066               (symbol-value
1067                (intern (format "hebrew-calendar-year-%s-%s-%s" ;; keviah
1068                                rosh-hashanah-day type passover-day))))
1069              (first-saturday ;; of Hebrew year
1070               (calendar-dayname-on-or-before 6 (+ 6 rosh-hashanah)))
1071              (saturday ;; which Saturday of the Hebrew year
1072               (/ (- d first-saturday) 7))
1073              (parasha (aref year-format saturday)))
1074           (if parasha
1075               (cons mark
1076                     (format
1077                      "Parashat %s"
1078                      (if (listp parasha) ;; Israel differs from diaspora
1079                          (if (car parasha)
1080                              (format "%s (diaspora), %s (Israel)"
1081                                      (hebrew-calendar-parasha-name (car parasha))
1082                                      (hebrew-calendar-parasha-name (cdr parasha)))
1083                            (format "%s (Israel)"
1084                                    (hebrew-calendar-parasha-name (cdr parasha))))
1085                        (hebrew-calendar-parasha-name parasha)))))))))
1086
1087 ;; The seven ordinary year types (keviot)
1088
1089 (defconst hebrew-calendar-year-Saturday-incomplete-Sunday
1090   [nil 52 nil nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 [21 22]
1091     23 24 nil 25 [26 27] [28 29] 30 [31 32] 33 34 35 36 37 38 39 40 [41 42]
1092     43 44 45 46 47 48 49 50]
1093   "The structure of the parashiot.
1094 Hebrew year starts on Saturday, is `incomplete' (Heshvan and Kislev each have
1095 29 days), and has Passover start on Sunday.")
1096
1097 (defconst hebrew-calendar-year-Saturday-complete-Tuesday
1098   [nil 52 nil nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 [21 22]
1099     23 24 nil 25 [26 27] [28 29] 30 [31 32] 33 34 35 36 37 38 39 40 [41 42]
1100     43 44 45 46 47 48 49 [50 51]]
1101   "The structure of the parashiot.
1102 Hebrew year that starts on Saturday, is `complete' (Heshvan and Kislev each
1103 have 30 days), and has Passover start on Tuesday.")
1104
1105 (defconst hebrew-calendar-year-Monday-incomplete-Tuesday
1106   [51 52 nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 [21 22]
1107     23 24 nil 25 [26 27] [28 29] 30 [31 32] 33 34 35 36 37 38 39 40 [41 42]
1108     43 44 45 46 47 48 49 [50 51]]
1109   "The structure of the parashiot.
1110 Hebrew year that starts on Monday, is `incomplete' (Heshvan and Kislev each
1111 have 29 days), and has Passover start on Tuesday.")
1112
1113 (defconst hebrew-calendar-year-Monday-complete-Thursday
1114   [51 52 nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 [21 22]
1115    23 24 nil 25 [26 27] [28 29] 30 [31 32] 33 (nil . 34) (34 . 35) (35 . 36)
1116    (36 . 37) (37 . 38) ([38 39] . 39) 40 [41 42] 43 44 45 46 47 48 49 [50 51]]
1117   "The structure of the parashiot.
1118 Hebrew year that starts on Monday, is `complete' (Heshvan and Kislev each have
1119 30 days), and has Passover start on Thursday.")
1120
1121 (defconst hebrew-calendar-year-Tuesday-regular-Thursday
1122   [51 52 nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 [21 22]
1123    23 24 nil 25 [26 27] [28 29] 30 [31 32] 33 (nil . 34) (34 . 35) (35 . 36)
1124    (36 . 37) (37 . 38) ([38 39] . 39) 40 [41 42] 43 44 45 46 47 48 49 [50 51]]
1125   "The structure of the parashiot.
1126 Hebrew year that starts on Tuesday, is `regular' (Heshvan has 29 days and
1127 Kislev has 30 days), and has Passover start on Thursday.")
1128
1129 (defconst hebrew-calendar-year-Thursday-regular-Saturday
1130   [52 nil nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 [21 22] 23
1131    24 nil (nil . 25) (25 . [26 27]) ([26 27] . [28 29]) ([28 29] . 30)
1132    (30 . 31) ([31 32] . 32) 33 34 35 36 37 38 39 40 [41 42] 43 44 45 46 47 48
1133    49 50]
1134   "The structure of the parashiot.
1135 Hebrew year that starts on Thursday, is `regular' (Heshvan has 29 days and
1136 Kislev has 30 days), and has Passover start on Saturday.")
1137
1138 (defconst hebrew-calendar-year-Thursday-complete-Sunday
1139   [52 nil nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
1140     23 24 nil 25 [26 27] [28 29] 30 [31 32] 33 34 35 36 37 38 39 40 [41 42]
1141     43 44 45 46 47 48 49 50]
1142   "The structure of the parashiot.
1143 Hebrew year that starts on Thursday, is `complete' (Heshvan and Kislev each
1144 have 30 days), and has Passover start on Sunday.")
1145
1146 ;; The seven leap year types (keviot)
1147
1148 (defconst hebrew-calendar-year-Saturday-incomplete-Tuesday
1149   [nil 52 nil nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
1150     23 24 25 26 27 nil 28 29 30 31 32 33 34 35 36 37 38 39 40 [41 42]
1151     43 44 45 46 47 48 49 [50 51]]
1152   "The structure of the parashiot.
1153 Hebrew year that starts on Saturday, is `incomplete' (Heshvan and Kislev each
1154 have 29 days), and has Passover start on Tuesday.")
1155
1156 (defconst hebrew-calendar-year-Saturday-complete-Thursday
1157   [nil 52 nil nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
1158    23 24 25 26 27 nil 28 29 30 31 32 33 (nil . 34) (34 . 35) (35 . 36)
1159    (36 . 37) (37 . 38) ([38 39] . 39) 40 [41 42] 43 44 45 46 47 48 49 [50 51]]
1160   "The structure of the parashiot.
1161 Hebrew year that starts on Saturday, is `complete' (Heshvan and Kislev each
1162 have 30 days), and has Passover start on Thursday.")
1163
1164 (defconst hebrew-calendar-year-Monday-incomplete-Thursday
1165   [51 52 nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
1166    23 24 25 26 27 nil 28 29 30 31 32 33 (nil . 34) (34 . 35) (35 . 36)
1167    (36 . 37) (37 . 38) ([38 39] . 39) 40 [41 42] 43 44 45 46 47 48 49 [50 51]]
1168   "The structure of the parashiot.
1169 Hebrew year that starts on Monday, is `incomplete' (Heshvan and Kislev each
1170 have 29 days), and has Passover start on Thursday.")
1171
1172 (defconst hebrew-calendar-year-Monday-complete-Saturday
1173   [51 52 nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
1174    23 24 25 26 27 nil (nil . 28) (28 . 29) (29 . 30) (30 . 31) (31 . 32)
1175    (32 . 33) (33 . 34) (34 . 35) (35 . 36) (36 . 37) (37 . 38) (38 . 39)
1176    (39 . 40) (40 . 41) ([41 42] . 42) 43 44 45 46 47 48 49 50]
1177   "The structure of the parashiot.
1178 Hebrew year that starts on Monday, is `complete' (Heshvan and Kislev each have
1179 30 days), and has Passover start on Saturday.")
1180
1181 (defconst hebrew-calendar-year-Tuesday-regular-Saturday
1182   [51 52 nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
1183    23 24 25 26 27 nil (nil . 28) (28 . 29) (29 . 30) (30 . 31) (31 . 32)
1184    (32 . 33) (33 . 34) (34 . 35) (35 . 36) (36 . 37) (37 . 38) (38 . 39)
1185    (39 . 40) (40 . 41) ([41 42] . 42) 43 44 45 46 47 48 49 50]
1186   "The structure of the parashiot.
1187 Hebrew year that starts on Tuesday, is `regular' (Heshvan has 29 days and
1188 Kislev has 30 days), and has Passover start on Saturday.")
1189
1190 (defconst hebrew-calendar-year-Thursday-incomplete-Sunday
1191   [52 nil nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
1192     23 24 25 26 27 28 nil 29 30 31 32 33 34 35 36 37 38 39 40 41 42
1193     43 44 45 46 47 48 49 50]
1194   "The structure of the parashiot.
1195 Hebrew year that starts on Thursday, is `incomplete' (Heshvan and Kislev both
1196 have 29 days), and has Passover start on Sunday.")
1197
1198 (defconst hebrew-calendar-year-Thursday-complete-Tuesday
1199   [52 nil nil 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22
1200     23 24 25 26 27 28 nil 29 30 31 32 33 34 35 36 37 38 39 40 41 42
1201     43 44 45 46 47 48 49 [50 51]]
1202   "The structure of the parashiot.
1203 Hebrew year that starts on Thursday, is `complete' (Heshvan and Kislev both
1204 have 30 days), and has Passover start on Tuesday.")
1205
1206 (provide 'cal-hebrew)
1207
1208 ;;; arch-tag: aaab6718-7712-42ac-a32d-28fe1f944f3c
1209 ;;; cal-hebrew.el ends here