Fix the MS-Windows build as followup to gnulib update
[emacs.git] / lisp / calendar / calendar.el
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1 ;;; calendar.el --- calendar functions
3 ;; Copyright (C) 1988-1995, 1997, 2000-2015 Free Software Foundation,
4 ;; Inc.
6 ;; Author: Edward M. Reingold <reingold@cs.uiuc.edu>
7 ;; Maintainer: Glenn Morris <rgm@gnu.org>
8 ;; Keywords: calendar
9 ;; Human-Keywords: calendar, Gregorian calendar, diary, holidays
11 ;; This file is part of GNU Emacs.
13 ;; GNU Emacs is free software: you can redistribute it and/or modify
14 ;; it under the terms of the GNU General Public License as published by
15 ;; the Free Software Foundation, either version 3 of the License, or
16 ;; (at your option) any later version.
18 ;; GNU Emacs is distributed in the hope that it will be useful,
19 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
21 ;; GNU General Public License for more details.
23 ;; You should have received a copy of the GNU General Public License
24 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
26 ;;; Commentary:
28 ;; This collection of functions implements a calendar window. It
29 ;; generates a calendar for the current month, together with the
30 ;; previous and coming months, or for any other three-month period.
31 ;; The calendar can be scrolled forward and backward in the window to
32 ;; show months in the past or future; the cursor can move forward and
33 ;; backward by days, weeks, or months, making it possible, for
34 ;; instance, to jump to the date a specified number of days, weeks, or
35 ;; months from the date under the cursor. The user can display a list
36 ;; of holidays and other notable days for the period shown; the
37 ;; notable days can be marked on the calendar, if desired. The user
38 ;; can also specify that dates having corresponding diary entries (in
39 ;; a file that the user specifies) be marked; the diary entries for
40 ;; any date can be viewed in a separate window. The diary and the
41 ;; notable days can be viewed independently of the calendar. Dates
42 ;; can be translated from the (usual) Gregorian calendar to the day of
43 ;; the year/days remaining in year, to the ISO commercial calendar, to
44 ;; the Julian (old style) calendar, to the Hebrew calendar, to the
45 ;; Islamic calendar, to the Bahá'í calendar, to the French
46 ;; Revolutionary calendar, to the Mayan calendar, to the Chinese
47 ;; calendar, to the Coptic calendar, to the Ethiopic calendar, and to
48 ;; the astronomical (Julian) day number. Times of sunrise/sunset can
49 ;; be displayed, as can the phases of the moon. Appointment
50 ;; notification for diary entries is available. Calendar printing via
51 ;; LaTeX is available.
53 ;; The following files are part of the calendar/diary code:
55 ;; appt.el Appointment notification
56 ;; cal-bahai.el Bahá'í calendar
57 ;; cal-china.el Chinese calendar
58 ;; cal-coptic.el Coptic/Ethiopic calendars
59 ;; cal-dst.el Daylight saving time rules
60 ;; cal-french.el French revolutionary calendar
61 ;; cal-hebrew.el Hebrew calendar
62 ;; cal-html.el Calendars in HTML
63 ;; cal-islam.el Islamic calendar
64 ;; cal-iso.el ISO calendar
65 ;; cal-julian.el Julian/astronomical calendars
66 ;; cal-mayan.el Mayan calendars
67 ;; cal-menu.el Menu support
68 ;; cal-move.el Movement in the calendar
69 ;; cal-persia.el Persian calendar
70 ;; cal-tex.el Calendars in LaTeX
71 ;; cal-x.el Dedicated frame functions
72 ;; calendar.el This file
73 ;; diary-lib.el Diary functions
74 ;; holidays.el Holiday functions
75 ;; lunar.el Phases of the moon
76 ;; solar.el Sunrise/sunset, equinoxes/solstices
78 ;; Technical details of all the calendrical calculations can be found in
79 ;; ``Calendrical Calculations: The Millennium Edition'' by Edward M. Reingold
80 ;; and Nachum Dershowitz, Cambridge University Press (2001).
82 ;; An earlier version of the technical details appeared in
83 ;; ``Calendrical Calculations'' by Nachum Dershowitz and Edward M. Reingold,
84 ;; Software--Practice and Experience, Volume 20, Number 9 (September, 1990),
85 ;; pages 899-928, and in ``Calendrical Calculations, Part II: Three Historical
86 ;; Calendars'' by E. M. Reingold, N. Dershowitz, and S. M. Clamen,
87 ;; Software--Practice and Experience, Volume 23, Number 4 (April, 1993),
88 ;; pages 383-404.
90 ;; Hard copies of these two papers can be obtained by sending email to
91 ;; reingold@cs.uiuc.edu with the SUBJECT "send-paper-cal" (no quotes) and
92 ;; the message BODY containing your mailing address (snail).
95 ;; A note on free variables:
97 ;; The calendar passes around a few dynamically bound variables, which
98 ;; unfortunately have rather common names. They are meant to be
99 ;; available for external functions, so the names can't be changed.
101 ;; displayed-month, displayed-year: bound in calendar-generate, the
102 ;; central month of the 3 month calendar window
103 ;; original-date, number: bound in diary-list-entries, the arguments
104 ;; with which that function was called.
105 ;; date, entry: bound in diary-list-sexp-entries (qv)
107 ;; Bound in diary-list-entries:
108 ;; diary-entries-list: use in d-l, appt.el, and by diary-add-to-list
109 ;; diary-saved-point: only used in diary-lib.el, passed to the display func
110 ;; date-string: only used in diary-lib.el
111 ;; list-only: don't modify the diary-buffer, just return a list of entries
112 ;; file-glob-attrs: yuck
114 ;;; Code:
116 (load "cal-loaddefs" nil t)
118 ;; Avoid recursive load of calendar when loading cal-menu. Yuck.
119 (provide 'calendar)
120 (require 'cal-menu)
122 (defgroup calendar nil
123 "Calendar and time management support."
124 :prefix "calendar-"
125 :group 'applications)
127 (defgroup calendar-hooks nil
128 "Calendar hooks."
129 :prefix "calendar-"
130 :group 'calendar)
132 (defgroup calendar-faces nil
133 "Calendar faces."
134 :prefix "calendar-"
135 :group 'calendar)
137 (defcustom calendar-offset 0
138 "The offset of the principal month from the center of the calendar window.
139 0 means the principal month is in the center (default), -1 means on the left,
140 +1 means on the right. Larger (or smaller) values push the principal month off
141 the screen."
142 :type 'integer
143 :group 'calendar)
145 (defcustom calendar-setup nil
146 "The frame setup of the calendar.
147 The choices are: `one-frame' (calendar and diary together in one separate,
148 dedicated frame); `two-frames' (calendar and diary in separate, dedicated
149 frames); `calendar-only' (calendar in a separate, dedicated frame); with
150 any other value the current frame is used. Using any of the first
151 three options overrides the value of `calendar-view-diary-initially-flag'."
152 :type '(choice
153 (const :tag "calendar and diary in separate frame" one-frame)
154 (const :tag "calendar and diary each in own frame" two-frames)
155 (const :tag "calendar in separate frame" calendar-only)
156 (const :tag "use current frame" nil))
157 :group 'calendar)
159 (defcustom calendar-minimum-window-height 8
160 "Minimum height `calendar-generate-window' should use for calendar window."
161 :type 'integer
162 :version "22.1"
163 :group 'calendar)
165 ;; See discussion in bug#1806.
166 (defcustom calendar-split-width-threshold nil
167 "Value to use for `split-width-threshold' when creating a calendar.
168 This only affects frames wider than the default value of
169 `split-width-threshold'."
170 :type '(choice (const nil)
171 (integer))
172 :version "23.2"
173 :group 'calendar)
175 (defcustom calendar-week-start-day 0
176 "The day of the week on which a week in the calendar begins.
177 0 means Sunday (default), 1 means Monday, and so on.
179 If you change this variable directly (without using customize)
180 after starting `calendar', you should call `calendar-redraw' to
181 update the calendar display to reflect the change, otherwise
182 movement commands will not work correctly."
183 :type 'integer
184 ;; Change the initialize so that if you reload calendar.el, it will not
185 ;; cause a redraw (which may fail, e.g. with "invalid byte-code in
186 ;; calendar.elc" because of the "byte-compile-dynamic").
187 :initialize 'custom-initialize-default
188 :set (lambda (sym val)
189 (set sym val)
190 (calendar-redraw))
191 :group 'calendar)
193 (defcustom calendar-view-diary-initially-flag nil
194 "Non-nil means display current date's diary entries on entry to calendar.
195 The diary is displayed in another window when the calendar is first displayed,
196 if the current date is visible. The number of days of diary entries displayed
197 is governed by the variable `diary-number-of-entries'. This variable can
198 be overridden by the value of `calendar-setup'."
199 :type 'boolean
200 :group 'diary)
202 ;; FIXME :set
203 (defcustom calendar-mark-diary-entries-flag nil
204 "Non-nil means mark dates with diary entries, in the calendar window.
205 The marking symbol is specified by the variable `diary-entry-marker'."
206 :type 'boolean
207 :group 'diary)
209 (defcustom calendar-remove-frame-by-deleting t
210 "Determine how the calendar mode removes a frame no longer needed.
211 If nil, make an icon of the frame. If non-nil, delete the frame."
212 :type 'boolean
213 :version "23.1" ; changed from nil to t
214 :group 'view
215 :group 'calendar)
217 (defface calendar-today
218 '((t (:underline t)))
219 "Face for indicating today's date in the calendar.
220 See the variable `calendar-today-marker'."
221 :group 'calendar-faces)
223 (defface diary
224 '((((min-colors 88) (class color) (background light))
225 :foreground "red1")
226 (((class color) (background light))
227 :foreground "red")
228 (((min-colors 88) (class color) (background dark))
229 :foreground "yellow1")
230 (((class color) (background dark))
231 :foreground "yellow")
232 (t
233 :weight bold))
234 "Face for highlighting diary entries.
235 Used to mark diary entries in the calendar (see `diary-entry-marker'),
236 and to highlight the date header in the fancy diary."
237 :group 'calendar-faces)
239 (defface holiday
240 '((((class color) (background light))
241 :background "pink")
242 (((class color) (background dark))
243 :background "chocolate4")
244 (t
245 :inverse-video t))
246 "Face for indicating in the calendar dates that have holidays.
247 See `calendar-holiday-marker'."
248 :group 'calendar-faces)
250 (defface calendar-weekday-header '((t :inherit font-lock-constant-face))
251 "Face used for weekday column headers in the calendar.
252 See also the face `calendar-weekend-header'."
253 :version "24.4"
254 :group 'calendar-faces)
256 (defface calendar-weekend-header '((t :inherit font-lock-comment-face))
257 "Face used for weekend column headers in the calendar.
258 See also the face `calendar-weekday-header'."
259 :version "24.4"
260 :group 'calendar-faces)
262 (defface calendar-month-header '((t :inherit font-lock-function-name-face))
263 "Face used for month headers in the calendar."
264 :version "24.4"
265 :group 'calendar-faces)
267 ;; These briefly checked font-lock-mode, but that is broken, since it
268 ;; is a buffer-local variable, and which buffer happens to be current
269 ;; when this file is loaded shouldn't make a difference. One could
270 ;; perhaps check global-font-lock-mode, or font-lock-global-modes; but
271 ;; this feature doesn't use font-lock, so there's no real reason it
272 ;; should respect those either. See bug#2199.
273 ;; They also used to check display-color-p, but that is a problem if
274 ;; loaded from --daemon. Since BW displays are rare now, this was
275 ;; also taken out. The way to keep it would be to have nil mean do a
276 ;; runtime check whenever this variable is used.
277 (defcustom diary-entry-marker 'diary
278 "How to mark dates that have diary entries.
279 The value can be either a single-character string (e.g. \"+\") or a face."
280 :type '(choice (string :tag "Single character string") face)
281 :group 'diary
282 :version "23.1")
284 (defcustom calendar-today-marker 'calendar-today
285 "How to mark today's date in the calendar.
286 The value can be either a single-character string (e.g. \"=\") or a face.
287 Used by `calendar-mark-today'."
288 :type '(choice (string :tag "Single character string") face)
289 :group 'calendar
290 :version "23.1")
292 (defcustom calendar-holiday-marker 'holiday
293 "How to mark notable dates in the calendar.
294 The value can be either a single-character string (e.g. \"*\") or a face."
295 :type '(choice (string :tag "Single character string") face)
296 :group 'holidays
297 :version "23.1")
299 (defcustom calendar-view-holidays-initially-flag nil
300 "Non-nil means display holidays for current three month period on entry.
301 The holidays are displayed in another window when the calendar is first
302 displayed."
303 :type 'boolean
304 :group 'holidays)
306 ;; FIXME :set
307 (defcustom calendar-mark-holidays-flag nil
308 "Non-nil means mark dates of holidays in the calendar window.
309 The marking symbol is specified by the variable `calendar-holiday-marker'."
310 :type 'boolean
311 :group 'holidays)
313 (defcustom calendar-mode-hook nil
314 "Hook run when entering `calendar-mode'."
315 :type 'hook
316 :group 'calendar-hooks)
318 (defcustom calendar-load-hook nil
319 "List of functions to be called after the calendar is first loaded.
320 This is the place to add key bindings to `calendar-mode-map'."
321 :type 'hook
322 :group 'calendar-hooks)
324 (defcustom calendar-initial-window-hook nil
325 "List of functions to be called when the calendar window is created.
326 Quitting the calendar and re-entering it will cause these functions
327 to be called again."
328 :type 'hook
329 :group 'calendar-hooks)
331 (defcustom calendar-today-visible-hook nil
332 "List of functions called whenever the current date is visible.
333 To mark today's date, add the function `calendar-mark-today'.
334 To replace the date with asterisks, add the function `calendar-star-date'.
335 See also `calendar-today-invisible-hook'.
337 In general, be careful about changing characters in the calendar buffer,
338 since it may cause the movement commands to fail."
339 :type 'hook
340 :options '(calendar-mark-today calendar-star-date)
341 :group 'calendar-hooks)
343 (defcustom calendar-today-invisible-hook nil
344 "List of functions called whenever the current date is not visible.
345 See also `calendar-today-visible-hook'."
346 :type 'hook
347 :group 'calendar-hooks)
349 (defcustom calendar-move-hook nil
350 "List of functions called whenever the cursor moves in the calendar.
351 For example,
353 (add-hook 'calendar-move-hook (lambda () (diary-view-entries 1)))
355 redisplays the diary for whatever date the cursor is moved to."
356 :type 'hook
357 :options '(calendar-update-mode-line)
358 :group 'calendar-hooks)
360 (defcustom calendar-date-echo-text
361 "mouse-2: general menu\nmouse-3: menu for this date"
362 "String displayed when the cursor is over a date in the calendar.
363 Can be either a fixed string, or a lisp expression that returns one.
364 When this expression is evaluated, DAY, MONTH, and YEAR are
365 integers appropriate to the relevant date. For example, to
366 display the ISO date:
368 (setq calendar-date-echo-text '(format \"ISO date: %s\"
369 (calendar-iso-date-string
370 (list month day year))))
371 Changing this variable without using customize has no effect on
372 pre-existing calendar windows."
373 :group 'calendar
374 :initialize 'custom-initialize-default
375 :risky t
376 :set (lambda (sym val)
377 (set sym val)
378 (calendar-redraw))
379 :type '(choice (string :tag "Fixed string")
380 (sexp :value
381 (format "ISO date: %s"
382 (calendar-iso-date-string
383 (list month day year)))))
384 :version "23.1")
387 (defvar calendar-month-digit-width nil
388 "Width of the region with numbers in each month in the calendar.")
390 (defvar calendar-month-width nil
391 "Full width of each month in the calendar.")
393 (defvar calendar-right-margin nil
394 "Right margin of the calendar.")
396 (defvar calendar-month-edges nil
397 "Alist of month edge columns.
398 Each element has the form (N LEFT FIRST LAST RIGHT), where
399 LEFT is the leftmost column associated with month segment N,
400 FIRST and LAST are the first and last columns with day digits in,
401 and LAST is the rightmost column.")
403 (defun calendar-month-edges (segment)
404 "Compute the month edge columns for month SEGMENT.
405 Returns a list (LEFT FIRST LAST RIGHT), where LEFT is the
406 leftmost column associated with a month, FIRST and LAST are the
407 first and last columns with day digits in, and LAST is the
408 rightmost column."
409 ;; The leftmost column with a digit in it in this month segment.
410 (let* ((first (+ calendar-left-margin
411 (* segment calendar-month-width)))
412 ;; The rightmost column with a digit in it in this month segment.
413 (last (+ first (1- calendar-month-digit-width)))
414 (left (if (eq segment 0)
416 (+ calendar-left-margin
417 (* segment calendar-month-width)
418 (- (/ calendar-intermonth-spacing 2)))))
419 ;; The rightmost edge of this month segment, dividing the
420 ;; space between months in two.
421 (right (+ calendar-left-margin
422 (* (1+ segment) calendar-month-width)
423 (- (/ calendar-intermonth-spacing 2)))))
424 (list left first last right)))
426 (defun calendar-recompute-layout-variables ()
427 "Recompute some layout-related calendar \"constants\"."
428 (setq calendar-month-digit-width (+ (* 6 calendar-column-width)
429 calendar-day-digit-width)
430 calendar-month-width (+ (* 7 calendar-column-width)
431 calendar-intermonth-spacing)
432 calendar-right-margin (+ calendar-left-margin
433 (* 3 (* 7 calendar-column-width))
434 (* 2 calendar-intermonth-spacing))
435 calendar-month-edges nil)
436 (dotimes (i 3)
437 (push (cons i (calendar-month-edges i)) calendar-month-edges))
438 (setq calendar-month-edges (reverse calendar-month-edges)))
440 (defun calendar-set-layout-variable (symbol value &optional minmax)
441 "Set SYMBOL's value to VALUE, an integer.
442 A positive/negative MINMAX enforces a minimum/maximum value.
443 Then redraw the calendar, if necessary."
444 (let ((oldvalue (symbol-value symbol)))
445 (custom-set-default symbol (if minmax
446 (if (< minmax 0)
447 (min value (- minmax))
448 (max value minmax))
449 value))
450 (unless (equal value oldvalue)
451 (calendar-recompute-layout-variables)
452 (calendar-redraw))))
454 (defcustom calendar-left-margin 5
455 "Empty space to the left of the first month in the calendar."
456 :group 'calendar
457 :initialize 'custom-initialize-default
458 :set 'calendar-set-layout-variable
459 :type 'integer
460 :version "23.1")
462 ;; Or you can view it as columns of width 2, with 1 space, no space
463 ;; after the last column, and a 5 space gap between month.
464 ;; FIXME check things work if this is odd.
465 (defcustom calendar-intermonth-spacing 4
466 "Space between months in the calendar. Minimum value is 1."
467 :group 'calendar
468 :initialize 'custom-initialize-default
469 :set (lambda (sym val)
470 (calendar-set-layout-variable sym val 1))
471 :type 'integer
472 :version "23.1")
474 ;; FIXME calendar-month-column-width?
475 (defcustom calendar-column-width 3
476 "Width of each day column in the calendar. Minimum value is 3."
477 :initialize 'custom-initialize-default
478 :set (lambda (sym val)
479 (calendar-set-layout-variable sym val 3))
480 :type 'integer
481 :version "23.1")
483 (defun calendar-day-header-construct (&optional width)
484 "Return the default value for `calendar-day-header-array'.
485 WIDTH defaults to `calendar-day-header-width'."
486 (or width (setq width calendar-day-header-width))
487 (calendar-abbrev-construct (if (<= width calendar-abbrev-length)
488 calendar-day-abbrev-array
489 calendar-day-name-array)
490 width))
492 ;; FIXME better to use a format spec?
493 (defcustom calendar-day-header-width 2
494 "Width of the day column headers in the calendar.
495 Must be at least one less than `calendar-column-width'."
496 :group 'calendar
497 :initialize 'custom-initialize-default
498 :set (lambda (sym val)
499 (or (calendar-customized-p 'calendar-day-header-array)
500 (setq calendar-day-header-array
501 (calendar-day-header-construct val)))
502 (calendar-set-layout-variable sym val (- 1 calendar-column-width)))
503 :type 'integer
504 :version "23.1")
506 ;; FIXME a format specifier instead?
507 (defcustom calendar-day-digit-width 2
508 "Width of the day digits in the calendar. Minimum value is 2."
509 :group 'calendar
510 :initialize 'custom-initialize-default
511 :set (lambda (sym val)
512 (calendar-set-layout-variable sym val 2))
513 :type 'integer
514 :version "23.1")
516 (defcustom calendar-intermonth-header nil
517 "Header text to display in the space to the left of each calendar month.
518 See `calendar-intermonth-text'."
519 :group 'calendar
520 :initialize 'custom-initialize-default
521 :risky t
522 :set (lambda (sym val)
523 (set sym val)
524 (calendar-redraw))
525 :type '(choice (const nil :tag "Nothing")
526 (string :tag "Fixed string")
527 (sexp :value
528 (propertize "WK" 'font-lock-face
529 'font-lock-function-name-face)))
530 :version "23.1")
532 (defcustom calendar-intermonth-text nil
533 "Text to display in the space to the left of each calendar month.
534 Can be nil, a fixed string, or a lisp expression that returns a string.
535 When the expression is evaluated, the variables DAY, MONTH and YEAR
536 are integers appropriate for the first day in each week.
537 Will be truncated to the smaller of `calendar-left-margin' and
538 `calendar-intermonth-spacing'. The last character is forced to be a space.
539 For example, to display the ISO week numbers:
541 (setq calendar-week-start-day 1
542 calendar-intermonth-text
543 '(propertize
544 (format \"%2d\"
545 (car
546 (calendar-iso-from-absolute
547 (calendar-absolute-from-gregorian (list month day year)))))
548 'font-lock-face 'font-lock-function-name-face))
550 See also `calendar-intermonth-header'."
551 :group 'calendar
552 :initialize 'custom-initialize-default
553 :risky t
554 :set (lambda (sym val)
555 (set sym val)
556 (calendar-redraw))
557 :type '(choice (const nil :tag "Nothing")
558 (string :tag "Fixed string")
559 (sexp :value
560 (propertize
561 (format "%2d"
562 (car
563 (calendar-iso-from-absolute
564 (calendar-absolute-from-gregorian
565 (list month day year)))))
566 'font-lock-face 'font-lock-function-name-face)))
567 :version "23.1")
569 (defcustom diary-file "~/diary"
570 "Name of the file in which one's personal diary of dates is kept.
572 The file's entries are lines beginning with any of the forms
573 specified by the variable `diary-date-forms', which by default
574 uses the forms of `diary-american-date-forms':
576 MONTH/DAY
577 MONTH/DAY/YEAR
578 MONTHNAME DAY
579 MONTHNAME DAY, YEAR
580 DAYNAME
582 with the remainder of the line being the diary entry string for
583 that date. MONTH and DAY are one or two digit numbers, YEAR is a
584 number and may be written in full or abbreviated to the final two
585 digits (if `diary-abbreviated-year-flag' is non-nil). MONTHNAME
586 and DAYNAME can be spelled in full (as specified by the variables
587 `calendar-month-name-array' and `calendar-day-name-array'), or
588 abbreviated (as specified by `calendar-month-abbrev-array' and
589 `calendar-day-abbrev-array') with or without a period. Case is
590 ignored. Any of DAY, MONTH, or MONTHNAME, YEAR can be `*' which
591 matches any day, month, or year, respectively. If the date does
592 not contain a year, it is generic and applies to any year. A
593 DAYNAME entry applies to the appropriate day of the week in every week.
595 You can customize `diary-date-forms' to your preferred format.
596 Three default styles are provided: `diary-american-date-forms',
597 `diary-european-date-forms', and `diary-iso-date-forms'.
598 You can choose between these by setting `calendar-date-style' in your
599 init file, or by using `calendar-set-date-style' when in the calendar.
601 A diary entry can be preceded by the character `diary-nonmarking-symbol'
602 \(ordinarily `&') to make that entry nonmarking--that is, it will not be
603 marked on dates in the calendar window but will appear in a diary window.
605 Multiline diary entries are made by indenting lines after the first with
606 either a TAB or one or more spaces.
608 Lines not in one the above formats are ignored. Here are some sample diary
609 entries (in the default American style):
611 12/22/1988 Twentieth wedding anniversary!!
612 &1/1. Happy New Year!
613 10/22 Ruth's birthday.
614 21: Payday
615 Tuesday--weekly meeting with grad students at 10am
616 Supowit, Shen, Bitner, and Kapoor to attend.
617 1/13/89 Friday the thirteenth!!
618 &thu 4pm squash game with Lloyd.
619 mar 16 Dad's birthday
620 April 15, 1989 Income tax due.
621 &* 15 time cards due.
623 If the first line of a diary entry consists only of the date or day name with
624 no trailing blanks or punctuation, then that line is not displayed in the
625 diary window; only the continuation lines is shown. For example, the
626 single diary entry
628 02/11/1989
629 Bill Blattner visits Princeton today
630 2pm Cognitive Studies Committee meeting
631 2:30-5:30 Lizzie at Lawrenceville for `Group Initiative'
632 4:00pm Jamie Tappenden
633 7:30pm Dinner at George and Ed's for Alan Ryan
634 7:30-10:00pm dance at Stewart Country Day School
636 will appear in the diary window without the date line at the beginning. This
637 facility allows the diary window to look neater, but can cause confusion if
638 used with more than one day's entries displayed.
640 Diary entries can be based on Lisp sexps. For example, the diary entry
642 %%(diary-block 11 1 1990 11 10 1990) Vacation
644 causes the diary entry \"Vacation\" to appear from November 1 through
645 November 10, 1990. See the documentation for the function
646 `diary-list-sexp-entries' for more details.
648 Diary entries based on the Hebrew, the Islamic and/or the Bahá'í
649 calendar are also possible, but because these are somewhat slow, they
650 are ignored unless you set the `diary-nongregorian-listing-hook' and
651 the `diary-nongregorian-marking-hook' appropriately. See the
652 documentation of these hooks for details.
654 Diary files can contain directives to include the contents of other files; for
655 details, see the documentation for the variable `diary-list-entries-hook'."
656 :type 'file
657 :group 'diary)
659 ;; FIXME do these have to be single characters?
660 (defcustom diary-nonmarking-symbol "&"
661 "Symbol indicating that a diary entry is not to be marked in the calendar."
662 :type 'string
663 :group 'diary)
665 (defcustom diary-chinese-entry-symbol "C"
666 "Symbol indicating a diary entry according to the Chinese calendar."
667 :type 'string
668 :group 'diary
669 :version "25.1")
671 (defcustom diary-hebrew-entry-symbol "H"
672 "Symbol indicating a diary entry according to the Hebrew calendar."
673 :type 'string
674 :group 'diary)
676 (defcustom diary-islamic-entry-symbol "I"
677 "Symbol indicating a diary entry according to the Islamic calendar."
678 :type 'string
679 :group 'diary)
681 (defcustom diary-bahai-entry-symbol "B"
682 "Symbol indicating a diary entry according to the Bahá'í calendar."
683 :type 'string
684 :group 'diary)
686 (defcustom calendar-date-style 'american
687 "Your preferred style for writing dates.
688 The options are:
689 `american' - month/day/year
690 `european' - day/month/year
691 `iso' - year/month/day
692 This affects how dates written in your diary are interpreted.
693 It also affects date display, as well as those calendar and diary
694 functions that take a date as an argument, e.g. `diary-date', by
695 changing the order in which the arguments are interpreted.
697 Setting this variable directly does not take effect (if the
698 calendar package is already loaded). Rather, use either
699 \\[customize] or the function `calendar-set-date-style'."
700 :version "23.1"
701 :type '(choice (const american :tag "Month/Day/Year")
702 (const european :tag "Day/Month/Year")
703 (const iso :tag "Year/Month/Day"))
704 :initialize 'custom-initialize-default
705 :set (lambda (symbol value)
706 (calendar-set-date-style value))
707 :group 'calendar)
709 ;; Next three are provided to aid in setting diary-date-forms.
710 ;; FIXME move to diary-lib?
711 (defcustom diary-iso-date-forms
712 '((month "[-/]" day "[^-/0-9]")
713 (year "[-/]" month "[-/]" day "[^0-9]")
714 ;; Cannot allow [-/] as separators here, since it would also match
715 ;; the first element (bug#7377).
716 (monthname " *" day "[^-0-9]")
717 (year " *" monthname " *" day "[^0-9]")
718 (dayname "\\W"))
719 "List of pseudo-patterns describing the ISO style of dates.
720 The defaults are: MONTH[-/]DAY; YEAR[-/]MONTH[-/]DAY; MONTHNAME DAY;
721 YEAR MONTHNAME DAY; DAYNAME. Normally you should not customize this,
722 but `diary-date-forms' (which see)."
723 :version "23.3" ; bug#7377
724 :type '(repeat (choice (cons :tag "Backup"
725 :value (backup . nil)
726 (const backup)
727 (repeat (list :inline t :format "%v"
728 (symbol :tag "Keyword")
729 (choice symbol regexp))))
730 (repeat (list :inline t :format "%v"
731 (symbol :tag "Keyword")
732 (choice symbol regexp)))))
733 :group 'diary)
735 (defcustom diary-american-date-forms
736 '((month "/" day "[^/0-9]")
737 (month "/" day "/" year "[^0-9]")
738 (monthname " *" day "[^,0-9]")
739 (monthname " *" day ", *" year "[^0-9]")
740 (dayname "\\W"))
741 "List of pseudo-patterns describing the American style of dates.
742 The defaults are: MONTH/DAY; MONTH/DAY/YEAR; MONTHNAME DAY;
743 MONTHNAME DAY, YEAR; DAYNAME. Normally you should not customize this,
744 but `diary-date-forms' (which see)."
745 :type '(repeat (choice (cons :tag "Backup"
746 :value (backup . nil)
747 (const backup)
748 (repeat (list :inline t :format "%v"
749 (symbol :tag "Keyword")
750 (choice symbol regexp))))
751 (repeat (list :inline t :format "%v"
752 (symbol :tag "Keyword")
753 (choice symbol regexp)))))
754 :group 'diary)
756 (defcustom diary-european-date-forms
757 '((day "/" month "[^/0-9]")
758 (day "/" month "/" year "[^0-9]")
759 (backup day " *" monthname "\\W+\\<\\([^*0-9]\\|\\([0-9]+[:aApP]\\)\\)")
760 (day " *" monthname " *" year "[^0-9]")
761 (dayname "\\W"))
762 "List of pseudo-patterns describing the European style of dates.
763 The defaults are: DAY/MONTH; DAY/MONTH/YEAR; DAY MONTHNAME;
764 DAY MONTHNAME YEAR; DAYNAME. Normally you should not customize this, but
765 `diary-date-forms' (which see)."
766 :type '(repeat (choice (cons :tag "Backup"
767 :value (backup . nil)
768 (const backup)
769 (repeat (list :inline t :format "%v"
770 (symbol :tag "Keyword")
771 (choice symbol regexp))))
772 (repeat (list :inline t :format "%v"
773 (symbol :tag "Keyword")
774 (choice symbol regexp)))))
775 :group 'diary)
777 (defvar diary-font-lock-keywords)
779 (defcustom diary-date-forms (cond ((eq calendar-date-style 'iso)
780 diary-iso-date-forms)
781 ((eq calendar-date-style 'european)
782 diary-european-date-forms)
783 (t diary-american-date-forms))
784 "List of pseudo-patterns describing the forms of date used in the diary.
785 The patterns on the list must be MUTUALLY EXCLUSIVE and should not match
786 any portion of the diary entry itself, just the date component.
788 A pseudo-pattern is a list of regular expressions and the keywords `month',
789 `day', `year', `monthname', and `dayname'. The keyword `monthname' will
790 match the name of the month (see `calendar-month-name-array'), capitalized
791 or not, or its user-specified abbreviation (see `calendar-month-abbrev-array'),
792 followed by a period or not; it will also match `*'. Similarly, `dayname'
793 will match the name of the day (see `calendar-day-name-array'), capitalized or
794 not, or its user-specified abbreviation (see `calendar-day-abbrev-array'),
795 followed by a period or not. The keywords `month', `day', and `year' will
796 match those numerical values, preceded by arbitrarily many zeros; they will
797 also match `*'.
799 The matching of the diary entries with the date forms is done with the
800 standard syntax table from Fundamental mode, but with the `*' changed so
801 that it is a word constituent.
803 If, to be mutually exclusive, a pseudo-pattern must match a portion of the
804 diary entry itself, the first element of the pattern MUST be `backup'. This
805 directive causes the date recognizer to back up to the beginning of the
806 current word of the diary entry, so in no case can the pattern match more than
807 a portion of the first word of the diary entry.
809 For examples of three common styles, see `diary-american-date-forms',
810 `diary-european-date-forms', and `diary-iso-date-forms'."
811 :type '(repeat (choice (cons :tag "Backup"
812 :value (backup . nil)
813 (const backup)
814 (repeat (list :inline t :format "%v"
815 (symbol :tag "Keyword")
816 (choice symbol regexp))))
817 (repeat (list :inline t :format "%v"
818 (symbol :tag "Keyword")
819 (choice symbol regexp)))))
820 :set-after '(calendar-date-style diary-iso-date-forms
821 diary-european-date-forms
822 diary-american-date-forms)
823 :initialize 'custom-initialize-default
824 :set (lambda (symbol value)
825 (unless (equal value (eval symbol))
826 (custom-set-default symbol value)
827 (setq diary-font-lock-keywords (diary-font-lock-keywords))
828 ;; Need to redraw not just to get new font-locking, but also
829 ;; to pick up any newly recognized entries.
830 (and (diary-live-p)
831 (diary))))
832 :group 'diary)
834 ;; Next three are provided to aid in setting calendar-date-display-form.
835 (defcustom calendar-iso-date-display-form '((format "%s-%.2d-%.2d" year
836 (string-to-number month)
837 (string-to-number day)))
838 "Pseudo-pattern governing the way a date appears in the ISO style.
839 Normally you should not customize this, but `calendar-date-display-form'
840 \(which see)."
841 :type 'sexp
842 :version "23.1"
843 :group 'calendar)
845 (defcustom calendar-european-date-display-form
846 '((if dayname (concat dayname ", ")) day " " monthname " " year)
847 "Pseudo-pattern governing the way a date appears in the European style.
848 Normally you should not customize this, but `calendar-date-display-form'
849 \(which see)."
850 :type 'sexp
851 :group 'calendar)
853 (defcustom calendar-american-date-display-form
854 '((if dayname (concat dayname ", ")) monthname " " day ", " year)
855 "Pseudo-pattern governing the way a date appears in the American style.
856 Normally you should not customize this, but `calendar-date-display-form'
857 \(which see)."
858 :type 'sexp
859 :group 'calendar)
861 (defcustom calendar-date-display-form
862 (cond ((eq calendar-date-style 'iso)
863 calendar-iso-date-display-form)
864 ((eq calendar-date-style 'european)
865 calendar-european-date-display-form)
866 (t calendar-american-date-display-form))
867 "Pseudo-pattern governing the way a calendar date appears.
868 Used by the function `calendar-date-string' (which see), a pseudo-pattern
869 is a list of expressions that can involve the keywords `month', `day',
870 and `year' (all numbers in string form), and `monthname' and `dayname'
871 \(both alphabetic strings). For example, a typical American form would be
873 '(month \"/\" day \"/\" (substring year -2))
875 whereas
877 '((format \"%9s, %9s %2s, %4s\" dayname monthname day year))
879 would give the usual American style in fixed-length fields. The variables
880 `calendar-iso-date-display-form', `calendar-european-date-display-form', and
881 `calendar-american-date-display-form' provide some defaults for three common
882 styles."
883 :type 'sexp
884 :set-after '(calendar-date-style calendar-iso-date-display-form
885 calendar-european-date-display-form
886 calendar-american-date-display-form)
887 :group 'calendar)
889 (defcustom calendar-american-month-header
890 '(propertize (format "%s %d" (calendar-month-name month) year)
891 'font-lock-face 'calendar-month-header)
892 "Default format for calendar month headings with the American date style.
893 Normally you should not customize this, but `calender-month-header'."
894 :group 'calendar
895 :risky t
896 :type 'sexp
897 :version "24.4") ; font-lock-function-name-face -> calendar-month-header
899 (defcustom calendar-european-month-header
900 '(propertize (format "%s %d" (calendar-month-name month) year)
901 'font-lock-face 'calendar-month-header)
902 "Default format for calendar month headings with the European date style.
903 Normally you should not customize this, but `calender-month-header'."
904 :group 'calendar
905 :risky t
906 :type 'sexp
907 :version "24.4") ; font-lock-function-name-face -> calendar-month-header
909 (defcustom calendar-iso-month-header
910 '(propertize (format "%d %s" year (calendar-month-name month))
911 'font-lock-face 'calendar-month-header)
912 "Default format for calendar month headings with the ISO date style.
913 Normally you should not customize this, but `calender-month-header'."
914 :group 'calendar
915 :risky t
916 :type 'sexp
917 :version "24.4") ; font-lock-function-name-face -> calendar-month-header
919 (defcustom calendar-month-header
920 (cond ((eq calendar-date-style 'iso)
921 calendar-iso-month-header)
922 ((eq calendar-date-style 'european)
923 calendar-european-month-header)
924 (t calendar-american-month-header))
925 "Expression to evaluate to return the calendar month headings.
926 When this expression is evaluated, the variables MONTH and YEAR are
927 integers appropriate to the relevant month. The result is padded
928 to the width of `calendar-month-digit-width'.
930 For examples of three common styles, see `calendar-american-month-header',
931 `calendar-european-month-header', and `calendar-iso-month-header'.
933 Changing this variable without using customize has no effect on
934 pre-existing calendar windows."
935 :group 'calendar
936 :initialize 'custom-initialize-default
937 :risky t
938 :set (lambda (sym val)
939 (set sym val)
940 (calendar-redraw))
941 :set-after '(calendar-date-style calendar-american-month-header
942 calendar-european-month-header
943 calendar-iso-month-header)
944 :type 'sexp
945 :version "24.3")
947 (defun calendar-set-date-style (style)
948 "Set the style of calendar and diary dates to STYLE (a symbol).
949 The valid styles are described in the documentation of `calendar-date-style'."
950 (interactive (list (intern
951 (completing-read "Date style: "
952 '("american" "european" "iso") nil t
953 nil nil "american"))))
954 (or (memq style '(american european iso))
955 (setq style 'american))
956 (setq calendar-date-style style
957 calendar-date-display-form
958 (symbol-value (intern-soft
959 (format "calendar-%s-date-display-form" style)))
960 calendar-month-header
961 (symbol-value (intern-soft (format "calendar-%s-month-header" style)))
962 diary-date-forms
963 (symbol-value (intern-soft (format "diary-%s-date-forms" style))))
964 (calendar-redraw)
965 (calendar-update-mode-line))
967 (defcustom diary-show-holidays-flag t
968 "Non-nil means include holidays in the diary display.
969 The holidays appear in the mode line of the diary buffer, or in the
970 fancy diary buffer next to the date. This slows down the diary functions
971 somewhat; setting it to nil makes the diary display faster."
972 :type 'boolean
973 :group 'holidays)
975 (defcustom calendar-debug-sexp nil
976 "Turn debugging on when evaluating a sexp in the diary or holiday list."
977 :type 'boolean
978 :group 'calendar)
980 (defcustom calendar-hebrew-all-holidays-flag nil
981 "If nil, show only major holidays from the Hebrew calendar.
982 This means only those Jewish holidays that appear on secular calendars.
983 Otherwise, show all the holidays that would appear in a complete Hebrew
984 calendar."
985 :type 'boolean
986 :group 'holidays)
988 (defcustom calendar-christian-all-holidays-flag nil
989 "If nil, show only major holidays from the Christian calendar.
990 This means only those Christian holidays that appear on secular calendars.
991 Otherwise, show all the holidays that would appear in a complete Christian
992 calendar."
993 :type 'boolean
994 :group 'holidays)
996 (defcustom calendar-islamic-all-holidays-flag nil
997 "If nil, show only major holidays from the Islamic calendar.
998 This means only those Islamic holidays that appear on secular calendars.
999 Otherwise, show all the holidays that would appear in a complete Islamic
1000 calendar."
1001 :type 'boolean
1002 :group 'holidays)
1004 (defcustom calendar-bahai-all-holidays-flag nil
1005 "If nil, show only major holidays from the Bahá'í calendar.
1006 These are the days on which work and school must be suspended.
1007 Otherwise, show all the holidays that would appear in a complete Bahá'í
1008 calendar."
1009 :type 'boolean
1010 :group 'holidays)
1012 (defcustom calendar-chinese-all-holidays-flag nil
1013 "If nil, show only the major holidays from the Chinese calendar."
1014 :version "23.1"
1015 :type 'boolean
1016 :group 'holidays)
1018 ;;; End of user options.
1020 (calendar-recompute-layout-variables)
1022 (defconst calendar-first-date-row 3
1023 "First row in the calendar with actual dates.")
1025 (defconst calendar-buffer "*Calendar*"
1026 "Name of the buffer used for the calendar.")
1028 (defconst holiday-buffer "*Holidays*"
1029 "Name of the buffer used for the displaying the holidays.")
1031 (defconst diary-fancy-buffer "*Fancy Diary Entries*"
1032 "Name of the buffer used for the optional fancy display of the diary.")
1034 (defconst calendar-other-calendars-buffer "*Other Calendars*"
1035 "Name of the buffer used for the display of date on other calendars.")
1037 (defconst lunar-phases-buffer "*Phases of Moon*"
1038 "Name of the buffer used for the lunar phases.")
1040 (defconst solar-sunrises-buffer "*Sunrise/Sunset Times*"
1041 "Name of buffer used for sunrise/sunset times.")
1043 (defconst calendar-hebrew-yahrzeit-buffer "*Yahrzeits*"
1044 "Name of the buffer used by `list-yahrzeit-dates'.")
1046 (defmacro calendar-increment-month (mon yr n &optional nmonths)
1047 "Increment the variables MON and YR by N months.
1048 Forward if N is positive or backward if N is negative.
1049 A negative YR is interpreted as BC; -1 being 1 BC, and so on.
1050 Optional NMONTHS is the number of months per year (default 12)."
1051 ;; Can view this as a form of base-nmonths arithmetic, in which "a
1052 ;; year" = "ten", and we never bother to use hundreds.
1053 `(let ((nmonths (or ,nmonths 12))
1054 macro-y)
1055 (if (< ,yr 0) (setq ,yr (1+ ,yr))) ; -1 BC -> 0 AD, etc
1056 (setq macro-y (+ (* ,yr nmonths) ,mon -1 ,n)
1057 ,mon (1+ (mod macro-y nmonths))
1058 ,yr (/ macro-y nmonths))
1059 ;; Alternative:
1060 ;;; (setq macro-y (+ (* ,yr nmonths) ,mon -1 ,n)
1061 ;;; ,yr (/ macro-y nmonths)
1062 ;;; ,mon (- macro-y (* ,yr nmonths)))
1063 (and (< macro-y 0) (> ,mon 1) (setq ,yr (1- ,yr)))
1064 (if (< ,yr 1) (setq ,yr (1- ,yr))))) ; 0 AD -> -1 BC, etc
1066 (defvar displayed-month)
1067 (defvar displayed-year)
1069 (defun calendar-increment-month-cons (n &optional mon yr)
1070 "Return the Nth month after MON/YR.
1071 The return value is a pair (MONTH . YEAR).
1072 MON defaults to `displayed-month'. YR defaults to `displayed-year'."
1073 (unless mon (setq mon displayed-month))
1074 (unless yr (setq yr displayed-year))
1075 (calendar-increment-month mon yr n)
1076 (cons mon yr))
1078 (defmacro calendar-sum (index initial condition expression)
1079 "For INDEX = INITIAL, +1, ... (as long as CONDITION holds), sum EXPRESSION."
1080 (declare (debug (symbolp form form form)))
1081 `(let ((,index ,initial)
1082 (sum 0))
1083 (while ,condition
1084 (setq sum (+ sum ,expression)
1085 ,index (1+ ,index)))
1086 sum))
1088 (defmacro calendar-in-read-only-buffer (buffer &rest body)
1089 "Switch to BUFFER and execute the forms in BODY.
1090 First creates or erases BUFFER as needed. Leaves BUFFER read-only,
1091 with disabled undo. Leaves point at point-min, displays BUFFER."
1092 (declare (indent 1) (debug t))
1093 `(progn
1094 (set-buffer (get-buffer-create ,buffer))
1095 (or (derived-mode-p 'special-mode) (special-mode))
1096 (setq buffer-read-only nil
1097 buffer-undo-list t)
1098 (erase-buffer)
1099 ,@body
1100 (goto-char (point-min))
1101 (set-buffer-modified-p nil)
1102 (setq buffer-read-only t)
1103 (display-buffer ,buffer)))
1105 ;; The following are in-line for speed; they can be called thousands of times
1106 ;; when looking up holidays or processing the diary. Here, for example, are
1107 ;; the numbers of calls to calendar/diary/holiday functions in preparing the
1108 ;; fancy diary display, for a moderately complex diary file, with functions
1109 ;; used instead of macros. There were a total of 10000 such calls:
1110 ;;
1111 ;; 1934 calendar-extract-month
1112 ;; 1852 calendar-extract-year
1113 ;; 1819 calendar-extract-day
1114 ;; 845 calendar-leap-year-p
1115 ;; 837 calendar-day-number
1116 ;; 775 calendar-absolute-from-gregorian
1117 ;; 346 calendar-last-day-of-month
1118 ;; 286 calendar-hebrew-last-day-of-month
1119 ;; 188 calendar-hebrew-leap-year-p
1120 ;; 180 calendar-hebrew-elapsed-days
1121 ;; 163 calendar-hebrew-last-month-of-year
1122 ;; 66 calendar-date-compare
1123 ;; 65 calendar-hebrew-days-in-year
1124 ;; 60 calendar-julian-to-absolute
1125 ;; 50 calendar-hebrew-to-absolute
1126 ;; 43 calendar-date-equal
1127 ;; 38 calendar-gregorian-from-absolute
1128 ;; .
1129 ;;
1130 ;; The use of these seven macros eliminates the overhead of 92% of the function
1131 ;; calls; it's faster this way.
1133 (defsubst calendar-extract-month (date)
1134 "Extract the month part of DATE which has the form (month day year)."
1135 (car date))
1137 ;; Note gives wrong answer for result of (calendar-read-date 'noday),
1138 ;; but that is only used by `calendar-other-month'.
1139 (defsubst calendar-extract-day (date)
1140 "Extract the day part of DATE which has the form (month day year)."
1141 (cadr date))
1143 (defsubst calendar-extract-year (date)
1144 "Extract the year part of DATE which has the form (month day year)."
1145 (nth 2 date))
1147 (defsubst calendar-leap-year-p (year)
1148 "Return t if YEAR is a Gregorian leap year.
1149 A negative year is interpreted as BC; -1 being 1 BC, and so on."
1150 ;; 1 BC = 0 AD, 2 BC acts like 1 AD, etc.
1151 (if (< year 0) (setq year (1- (abs year))))
1152 (and (zerop (% year 4))
1153 (or (not (zerop (% year 100)))
1154 (zerop (% year 400)))))
1156 ;; The foregoing is a bit faster, but not as clear as the following:
1157 ;;
1158 ;;(defsubst calendar-leap-year-p (year)
1159 ;; "Return t if YEAR is a Gregorian leap year."
1160 ;; (or
1161 ;; (and (zerop (% year 4))
1162 ;; (not (zerop (% year 100))))
1163 ;; (zerop (% year 400)))
1165 (defsubst calendar-last-day-of-month (month year)
1166 "The last day in MONTH during YEAR."
1167 (if (and (= month 2) (calendar-leap-year-p year))
1168 29
1169 (aref [31 28 31 30 31 30 31 31 30 31 30 31] (1- month))))
1171 ;; An explanation of the calculation can be found in PascAlgorithms by
1172 ;; Edward and Ruth Reingold, Scott-Foresman/Little, Brown, 1988.
1174 (defsubst calendar-day-number (date)
1175 "Return the day number within the year of the date DATE.
1176 For example, (calendar-day-number '(1 1 1987)) returns the value 1,
1177 while (calendar-day-number '(12 31 1980)) returns 366."
1178 (let* ((month (calendar-extract-month date))
1179 (day (calendar-extract-day date))
1180 (year (calendar-extract-year date))
1181 (day-of-year (+ day (* 31 (1- month)))))
1182 (when (> month 2)
1183 (setq day-of-year (- day-of-year (/ (+ 23 (* 4 month)) 10)))
1184 (if (calendar-leap-year-p year)
1185 (setq day-of-year (1+ day-of-year))))
1186 day-of-year))
1188 (defsubst calendar-absolute-from-gregorian (date)
1189 "The number of days elapsed between the Gregorian date 12/31/1 BC and DATE.
1190 The Gregorian date Sunday, December 31, 1 BC is imaginary.
1191 DATE is a list of the form (month day year). A negative year is
1192 interpreted as BC; -1 being 1 BC, and so on. Dates before 12/31/1 BC
1193 return negative results."
1194 (let ((year (calendar-extract-year date))
1195 offset-years)
1196 (cond ((zerop year)
1197 (error "There was no year zero"))
1198 ((> year 0)
1199 (setq offset-years (1- year))
1200 (+ (calendar-day-number date) ; days this year
1201 (* 365 offset-years) ; + days in prior years
1202 (/ offset-years 4) ; + Julian leap years
1203 (- (/ offset-years 100)) ; - century years
1204 (/ offset-years 400))) ; + Gregorian leap years
1205 (t
1206 ;; Years between date and 1 BC, excluding 1 BC (1 for 2 BC, etc).
1207 (setq offset-years (abs (1+ year)))
1208 (- (calendar-day-number date)
1209 (* 365 offset-years)
1210 (/ offset-years 4)
1211 (- (/ offset-years 100))
1212 (/ offset-years 400)
1213 (calendar-day-number '(12 31 -1))))))) ; days in year 1 BC
1215 ;;;###autoload
1216 (defun calendar (&optional arg)
1217 "Display a three-month Gregorian calendar.
1218 The three months appear side by side, with the current month in
1219 the middle surrounded by the previous and next months. The
1220 cursor is put on today's date. If optional prefix argument ARG
1221 is non-nil, prompts for the central month and year.
1223 Once in the calendar window, future or past months can be moved
1224 into view. Arbitrary months can be displayed, or the calendar
1225 can be scrolled forward or backward. The cursor can be moved
1226 forward or backward by one day, one week, one month, or one year.
1227 All of these commands take prefix arguments which, when negative,
1228 cause movement in the opposite direction. For convenience, the
1229 digit keys and the minus sign are automatically prefixes. Use
1230 \\[describe-mode] for details of the key bindings in the calendar
1231 window.
1233 Displays the calendar in a separate window, or optionally in a
1234 separate frame, depending on the value of `calendar-setup'.
1236 If `calendar-view-diary-initially-flag' is non-nil, also displays the
1237 diary entries for the current date (or however many days
1238 `diary-number-of-entries' specifies). This variable can be
1239 overridden by `calendar-setup'. As well as being displayed,
1240 diary entries can also be marked on the calendar (see
1241 `calendar-mark-diary-entries-flag').
1243 Runs the following hooks:
1245 `calendar-load-hook' - after loading calendar.el
1246 `calendar-today-visible-hook', `calendar-today-invisible-hook' - after
1247 generating a calendar, if today's date is visible or not, respectively
1248 `calendar-initial-window-hook' - after first creating a calendar
1250 This function is suitable for execution in an init file."
1251 (interactive "P")
1252 ;; Avoid loading cal-x unless it will be used.
1253 (if (and (memq calendar-setup '(one-frame two-frames calendar-only))
1254 (display-multi-frame-p))
1255 (calendar-frame-setup calendar-setup arg)
1256 (calendar-basic-setup arg)))
1258 (defun calendar-basic-setup (&optional arg nodisplay)
1259 "Create a three-month calendar.
1260 If optional prefix argument ARG is non-nil, prompts for the month
1261 and year, else uses the current date. If NODISPLAY is non-nil, don't
1262 display the generated calendar."
1263 (interactive "P")
1264 (let ((buff (current-buffer)))
1265 (set-buffer (get-buffer-create calendar-buffer))
1266 (calendar-mode)
1267 (let* ((pop-up-windows t)
1268 ;; Not really needed now, but means we use exactly the same
1269 ;; behavior as before in the non-wide case (see below).
1270 (split-height-threshold 1000)
1271 (split-width-threshold calendar-split-width-threshold)
1272 (date (if arg (calendar-read-date t)
1273 (calendar-current-date)))
1274 (month (calendar-extract-month date))
1275 (year (calendar-extract-year date)))
1276 (calendar-increment-month month year (- calendar-offset))
1277 ;; Display the buffer before calling calendar-generate-window so that it
1278 ;; can get a chance to adjust the window sizes to the frame size.
1279 (unless nodisplay
1280 ;; We want a window configuration that looks something like
1281 ;; X X | Y
1282 ;; - -----
1283 ;; C Z | C
1284 ;; where C is the calendar, and the LHS is the traditional,
1285 ;; non-wide frame, and the RHS is the wide frame case.
1286 ;; We should end up in the same state regardless of whether the
1287 ;; windows were initially split or not.
1288 ;; Previously, we only thought about the non-wide case.
1289 ;; We could just set split-height-threshold to 1000, relying on
1290 ;; the fact that the window splitting treated a single window as
1291 ;; a special case and would always split it (vertically). The
1292 ;; same thing does not work in the wide-frame case, so now we do
1293 ;; the splitting by hand.
1294 ;; See discussion in bug#1806.
1295 ;; Actually, this still does not do quite the right thing in the
1296 ;; wide frame case if started from a configuration like the LHS.
1297 ;; Eg if you start with a non-wide frame, call calendar, then
1298 ;; make the frame wider. This one is problematic because you
1299 ;; might need to split a totally unrelated window. Oh well, it
1300 ;; seems unlikely, and perhaps respecting the original layout is
1301 ;; the right thing in that case.
1302 ;;
1303 ;; Is this a wide frame? If so, split it horizontally.
1305 ;; The following doesn't sound useful: If we split horizontally
1306 ;; here, the subsequent `pop-to-buffer' will likely split again
1307 ;; horizontally and we end up with three side-by-side windows.
1308 (when (window-splittable-p (selected-window) t)
1309 (split-window-right))
1310 (pop-to-buffer calendar-buffer)
1311 ;; Has the window already been split vertically?
1312 (when (and (not (window-dedicated-p))
1313 (window-splittable-p (selected-window))
1314 (window-full-height-p))
1315 (let ((win (split-window-below)))
1316 ;; In the upper window, show whatever was visible before.
1317 ;; This looks better than using other-buffer.
1318 (switch-to-buffer buff)
1319 ;; Switch to the lower window with the calendar buffer.
1320 (select-window win))))
1321 (calendar-generate-window month year)
1322 (if (and calendar-view-diary-initially-flag
1323 (calendar-date-is-visible-p date))
1324 ;; Do not clobber the calendar with the diary, if the diary
1325 ;; has previously been shown in the window that now shows the
1326 ;; calendar (bug#18381).
1327 (let ((display-buffer-overriding-action
1328 '(nil . ((inhibit-same-window . t)))))
1329 (diary-view-entries)))))
1330 (if calendar-view-holidays-initially-flag
1331 (let* ((diary-buffer (diary-live-p))
1332 (diary-window (if diary-buffer (get-buffer-window diary-buffer)))
1333 (split-height-threshold (if diary-window 2 1000)))
1334 ;; FIXME display buffer?
1335 (calendar-list-holidays)))
1336 (run-hooks 'calendar-initial-window-hook))
1338 (defun calendar-generate-window (&optional mon yr)
1339 "Generate the calendar window for the current date.
1340 Optional integers MON and YR are used instead of today's date."
1341 (let* ((inhibit-read-only t)
1342 (today (calendar-current-date))
1343 (month (calendar-extract-month today))
1344 (day (calendar-extract-day today))
1345 (year (calendar-extract-year today))
1346 (today-visible (or (not mon)
1347 (<= (abs (calendar-interval mon yr month year)) 1)))
1348 (in-calendar-window (eq (window-buffer)
1349 (get-buffer calendar-buffer))))
1350 (calendar-generate (or mon month) (or yr year))
1351 (calendar-update-mode-line)
1352 (calendar-cursor-to-visible-date
1353 (if today-visible today (list displayed-month 1 displayed-year)))
1354 (set-buffer-modified-p nil)
1355 ;; Don't do any window-related stuff if we weren't called from a
1356 ;; window displaying the calendar.
1357 (when in-calendar-window
1358 (if (window-combined-p)
1359 ;; Adjust the window to exactly fit the displayed calendar.
1360 (fit-window-to-buffer nil nil calendar-minimum-window-height)
1361 ;; For a full height window or a window that is horizontally
1362 ;; combined don't fit height to that of its buffer.
1363 (set-window-vscroll nil 0))
1364 (sit-for 0))
1365 (and calendar-mark-holidays-flag
1366 ;; (calendar-date-is-valid-p today) ; useful for BC dates
1367 (calendar-mark-holidays)
1368 (and in-calendar-window (sit-for 0)))
1369 (unwind-protect
1370 (if calendar-mark-diary-entries-flag (diary-mark-entries))
1371 (run-hooks (if today-visible
1372 'calendar-today-visible-hook
1373 'calendar-today-invisible-hook)))))
1375 (defun calendar-generate (month year)
1376 "Generate a three-month Gregorian calendar centered around MONTH, YEAR."
1377 ;; A negative YEAR is interpreted as BC; -1 being 1 BC, and so on.
1378 ;; Note that while calendars for years BC could be displayed as it
1379 ;; stands, almost all other calendar functions (eg holidays) would
1380 ;; at best have unpredictable results for such dates.
1381 (if (< (+ month (* 12 (1- year))) 2)
1382 (error "Months before January, 1 AD cannot be displayed"))
1383 (setq displayed-month month
1384 displayed-year year)
1385 (erase-buffer)
1386 (calendar-increment-month month year -1)
1387 (dotimes (i 3)
1388 (calendar-generate-month month year
1389 (+ calendar-left-margin
1390 (* calendar-month-width i)))
1391 (calendar-increment-month month year 1)))
1393 (defun calendar-move-to-column (indent)
1394 "Like `move-to-column', but indents if the line is too short."
1395 (if (< (move-to-column indent) indent)
1396 (indent-to indent)))
1398 (defun calendar-ensure-newline ()
1399 "Move to the next line, adding a newline if necessary."
1400 (or (zerop (forward-line 1))
1401 (insert "\n")))
1403 (defun calendar-insert-at-column (indent string truncate)
1404 "Move to column INDENT, adding spaces as needed.
1405 Inserts STRING so that it ends at INDENT. STRING is either a
1406 literal string, or a sexp to evaluate to return such. Truncates
1407 STRING to length TRUNCATE, and ensures a trailing space."
1408 (if (not (ignore-errors (stringp (setq string (eval string)))))
1409 (calendar-move-to-column indent)
1410 (if (> (string-width string) truncate)
1411 (setq string (truncate-string-to-width string truncate)))
1412 (or (string-match " $" string)
1413 (setq string (concat (if (= (string-width string) truncate)
1414 (substring string 0 -1)
1415 string)
1416 ;; Avoid inserting text properties unless
1417 ;; we have to (ie, non-unit-width chars).
1418 ;; This is by no means essential.
1419 (if (= (string-width string) (length string))
1420 " "
1421 ;; Cribbed from buff-menu.el.
1422 (propertize
1423 " " 'display `(space :align-to ,indent))))))
1424 (calendar-move-to-column (- indent (string-width string)))
1425 (insert string)))
1427 (defun calendar-generate-month (month year indent)
1428 "Produce a calendar for MONTH, YEAR on the Gregorian calendar.
1429 The calendar is inserted at the top of the buffer in which point is currently
1430 located, but indented INDENT spaces. The indentation is done from the first
1431 character on the line and does not disturb the first INDENT characters on the
1432 line."
1433 (let ((blank-days ; at start of month
1434 (mod
1435 (- (calendar-day-of-week (list month 1 year))
1436 calendar-week-start-day)
1437 7))
1438 (last (calendar-last-day-of-month month year))
1439 (trunc (min calendar-intermonth-spacing
1440 (1- calendar-left-margin)))
1441 (day 1)
1442 j)
1443 (goto-char (point-min))
1444 (calendar-move-to-column indent)
1445 (insert
1446 (calendar-string-spread (list calendar-month-header)
1447 ?\s calendar-month-digit-width))
1448 (calendar-ensure-newline)
1449 (calendar-insert-at-column indent calendar-intermonth-header trunc)
1450 ;; Use the first N characters of each day to head the columns.
1451 (dotimes (i 7)
1452 (setq j (mod (+ calendar-week-start-day i) 7))
1453 (insert
1454 (truncate-string-to-width
1455 (propertize (calendar-day-name j 'header t)
1456 'font-lock-face (if (memq j '(0 6))
1457 'calendar-weekend-header
1458 'calendar-weekday-header))
1459 calendar-day-header-width nil ?\s)
1460 (make-string (- calendar-column-width calendar-day-header-width) ?\s)))
1461 (calendar-ensure-newline)
1462 (calendar-insert-at-column indent calendar-intermonth-text trunc)
1463 ;; Add blank days before the first of the month.
1464 (insert (make-string (* blank-days calendar-column-width) ?\s))
1465 ;; Put in the days of the month.
1466 (dotimes (i last)
1467 (setq day (1+ i))
1468 ;; TODO should numbers be left-justified, centered...?
1469 (insert (propertize
1470 (format (format "%%%dd" calendar-day-digit-width) day)
1471 'mouse-face 'highlight
1472 'help-echo (eval calendar-date-echo-text)
1473 ;; 'date property prevents intermonth text confusing re-searches.
1474 ;; (Tried intangible, it did not really work.)
1475 'date t)
1476 (make-string
1477 (- calendar-column-width calendar-day-digit-width) ?\s))
1478 (when (and (zerop (mod (+ day blank-days) 7))
1479 (/= day last))
1480 (calendar-ensure-newline)
1481 (setq day (1+ day)) ; first day of next week
1482 (calendar-insert-at-column indent calendar-intermonth-text trunc)))))
1484 (defun calendar-redraw ()
1485 "Redraw the calendar display, if `calendar-buffer' is live."
1486 (interactive)
1487 (when (get-buffer calendar-buffer)
1488 (with-current-buffer calendar-buffer
1489 (let ((cursor-date (calendar-cursor-to-nearest-date)))
1490 (calendar-generate-window displayed-month displayed-year)
1491 (calendar-cursor-to-visible-date cursor-date))
1492 (when (window-live-p (get-buffer-window))
1493 (set-window-point (get-buffer-window) (point))))))
1495 (defvar calendar-mode-map
1496 (let ((map (make-keymap)))
1497 (suppress-keymap map)
1498 (dolist (c '(narrow-to-region mark-word mark-sexp mark-paragraph
1499 mark-defun mark-whole-buffer mark-page
1500 downcase-region upcase-region kill-region
1501 copy-region-as-kill capitalize-region write-region))
1502 (define-key map (vector 'remap c) 'calendar-not-implemented))
1503 (define-key map "<" 'calendar-scroll-right)
1504 (define-key map "\C-x<" 'calendar-scroll-right)
1505 (define-key map [prior] 'calendar-scroll-right-three-months)
1506 (define-key map "\ev" 'calendar-scroll-right-three-months)
1507 (define-key map ">" 'calendar-scroll-left)
1508 (define-key map "\C-x>" 'calendar-scroll-left)
1509 (define-key map [next] 'calendar-scroll-left-three-months)
1510 (define-key map "\C-v" 'calendar-scroll-left-three-months)
1511 (define-key map "\C-b" 'calendar-backward-day)
1512 (define-key map "\C-p" 'calendar-backward-week)
1513 (define-key map "\e{" 'calendar-backward-month)
1514 (define-key map "\C-x[" 'calendar-backward-year)
1515 (define-key map "\C-f" 'calendar-forward-day)
1516 (define-key map "\C-n" 'calendar-forward-week)
1517 (define-key map [left] 'calendar-backward-day)
1518 (define-key map [up] 'calendar-backward-week)
1519 (define-key map [right] 'calendar-forward-day)
1520 (define-key map [down] 'calendar-forward-week)
1521 (define-key map "\e}" 'calendar-forward-month)
1522 (define-key map "\C-x]" 'calendar-forward-year)
1523 (define-key map "\C-a" 'calendar-beginning-of-week)
1524 (define-key map "\C-e" 'calendar-end-of-week)
1525 (define-key map "\ea" 'calendar-beginning-of-month)
1526 (define-key map "\ee" 'calendar-end-of-month)
1527 (define-key map "\e<" 'calendar-beginning-of-year)
1528 (define-key map "\e>" 'calendar-end-of-year)
1529 (define-key map "\C-@" 'calendar-set-mark)
1530 ;; Many people are used to typing C-SPC and getting C-@.
1531 (define-key map [?\C-\s] 'calendar-set-mark)
1532 (define-key map "\C-x\C-x" 'calendar-exchange-point-and-mark)
1533 (define-key map "\e=" 'calendar-count-days-region)
1534 (define-key map "gd" 'calendar-goto-date)
1535 (define-key map "gD" 'calendar-goto-day-of-year)
1536 (define-key map "gj" 'calendar-julian-goto-date)
1537 (define-key map "ga" 'calendar-astro-goto-day-number)
1538 (define-key map "gh" 'calendar-hebrew-goto-date)
1539 (define-key map "gi" 'calendar-islamic-goto-date)
1540 (define-key map "gb" 'calendar-bahai-goto-date)
1541 (define-key map "gC" 'calendar-chinese-goto-date)
1542 (define-key map "gk" 'calendar-coptic-goto-date)
1543 (define-key map "ge" 'calendar-ethiopic-goto-date)
1544 (define-key map "gp" 'calendar-persian-goto-date)
1545 (define-key map "gc" 'calendar-iso-goto-date)
1546 (define-key map "gw" 'calendar-iso-goto-week)
1547 (define-key map "gf" 'calendar-french-goto-date)
1548 (define-key map "gml" 'calendar-mayan-goto-long-count-date)
1549 (define-key map "gmpc" 'calendar-mayan-previous-round-date)
1550 (define-key map "gmnc" 'calendar-mayan-next-round-date)
1551 (define-key map "gmph" 'calendar-mayan-previous-haab-date)
1552 (define-key map "gmnh" 'calendar-mayan-next-haab-date)
1553 (define-key map "gmpt" 'calendar-mayan-previous-tzolkin-date)
1554 (define-key map "gmnt" 'calendar-mayan-next-tzolkin-date)
1555 (define-key map "Aa" 'appt-add)
1556 (define-key map "Ad" 'appt-delete)
1557 (define-key map "S" 'calendar-sunrise-sunset)
1558 (define-key map "M" 'calendar-lunar-phases)
1559 (define-key map " " 'scroll-other-window)
1560 (define-key map [?\S-\ ] 'scroll-other-window-down)
1561 (define-key map "\d" 'scroll-other-window-down)
1562 (define-key map "\C-c\C-l" 'calendar-redraw)
1563 (define-key map "." 'calendar-goto-today)
1564 (define-key map "o" 'calendar-other-month)
1565 (define-key map "q" 'calendar-exit)
1566 (define-key map "a" 'calendar-list-holidays)
1567 (define-key map "h" 'calendar-cursor-holidays)
1568 (define-key map "x" 'calendar-mark-holidays)
1569 (define-key map "u" 'calendar-unmark)
1570 (define-key map "m" 'diary-mark-entries)
1571 (define-key map "d" 'diary-view-entries)
1572 (define-key map "D" 'diary-view-other-diary-entries)
1573 (define-key map "s" 'diary-show-all-entries)
1574 (define-key map "pd" 'calendar-print-day-of-year)
1575 (define-key map "pC" 'calendar-chinese-print-date)
1576 (define-key map "pk" 'calendar-coptic-print-date)
1577 (define-key map "pe" 'calendar-ethiopic-print-date)
1578 (define-key map "pp" 'calendar-persian-print-date)
1579 (define-key map "pc" 'calendar-iso-print-date)
1580 (define-key map "pj" 'calendar-julian-print-date)
1581 (define-key map "pa" 'calendar-astro-print-day-number)
1582 (define-key map "ph" 'calendar-hebrew-print-date)
1583 (define-key map "pi" 'calendar-islamic-print-date)
1584 (define-key map "pb" 'calendar-bahai-print-date)
1585 (define-key map "pf" 'calendar-french-print-date)
1586 (define-key map "pm" 'calendar-mayan-print-date)
1587 (define-key map "po" 'calendar-print-other-dates)
1588 (define-key map "id" 'diary-insert-entry)
1589 (define-key map "iw" 'diary-insert-weekly-entry)
1590 (define-key map "im" 'diary-insert-monthly-entry)
1591 (define-key map "iy" 'diary-insert-yearly-entry)
1592 (define-key map "ia" 'diary-insert-anniversary-entry)
1593 (define-key map "ib" 'diary-insert-block-entry)
1594 (define-key map "ic" 'diary-insert-cyclic-entry)
1595 (define-key map "ihd" 'diary-hebrew-insert-entry)
1596 (define-key map "ihm" 'diary-hebrew-insert-monthly-entry)
1597 (define-key map "ihy" 'diary-hebrew-insert-yearly-entry)
1598 (define-key map "iid" 'diary-islamic-insert-entry)
1599 (define-key map "iim" 'diary-islamic-insert-monthly-entry)
1600 (define-key map "iiy" 'diary-islamic-insert-yearly-entry)
1601 (define-key map "iBd" 'diary-bahai-insert-entry)
1602 (define-key map "iBm" 'diary-bahai-insert-monthly-entry)
1603 (define-key map "iBy" 'diary-bahai-insert-yearly-entry)
1604 (define-key map "iCd" 'diary-chinese-insert-entry)
1605 (define-key map "iCm" 'diary-chinese-insert-monthly-entry)
1606 (define-key map "iCy" 'diary-chinese-insert-yearly-entry)
1607 (define-key map "iCa" 'diary-chinese-insert-anniversary-entry)
1608 (define-key map "?" 'calendar-goto-info-node)
1609 (define-key map "Hm" 'cal-html-cursor-month)
1610 (define-key map "Hy" 'cal-html-cursor-year)
1611 (define-key map "tm" 'cal-tex-cursor-month)
1612 (define-key map "tM" 'cal-tex-cursor-month-landscape)
1613 (define-key map "td" 'cal-tex-cursor-day)
1614 (define-key map "tw1" 'cal-tex-cursor-week)
1615 (define-key map "tw2" 'cal-tex-cursor-week2)
1616 (define-key map "tw3" 'cal-tex-cursor-week-iso) ; FIXME twi ?
1617 (define-key map "tw4" 'cal-tex-cursor-week-monday) ; twm ?
1618 (define-key map "twW" 'cal-tex-cursor-week2-summary)
1619 (define-key map "tfd" 'cal-tex-cursor-filofax-daily)
1620 (define-key map "tfw" 'cal-tex-cursor-filofax-2week)
1621 (define-key map "tfW" 'cal-tex-cursor-filofax-week)
1622 (define-key map "tfy" 'cal-tex-cursor-filofax-year)
1623 (define-key map "ty" 'cal-tex-cursor-year)
1624 (define-key map "tY" 'cal-tex-cursor-year-landscape)
1626 (define-key map [menu-bar edit] 'undefined)
1627 (define-key map [menu-bar search] 'undefined)
1629 (easy-menu-define nil map nil cal-menu-sunmoon-menu)
1630 (easy-menu-define nil map nil cal-menu-diary-menu)
1631 (easy-menu-define nil map nil cal-menu-holidays-menu)
1632 (easy-menu-define nil map nil cal-menu-goto-menu)
1633 (easy-menu-define nil map nil cal-menu-scroll-menu)
1635 ;; These are referenced in the default calendar-date-echo-text.
1636 (define-key map [down-mouse-3]
1637 (easy-menu-binding cal-menu-context-mouse-menu))
1638 (define-key map [down-mouse-2]
1639 (easy-menu-binding cal-menu-global-mouse-menu))
1641 ;; cf scroll-bar.el.
1642 (if (and (boundp 'x-toolkit-scroll-bars) x-toolkit-scroll-bars)
1643 (define-key map [vertical-scroll-bar mouse-1]
1644 'calendar-scroll-toolkit-scroll)
1645 ;; Left-click moves us forward in time, right-click backwards.
1646 (define-key map [vertical-scroll-bar mouse-1] 'calendar-scroll-left)
1647 (define-key map [vertical-scroll-bar drag-mouse-1] 'calendar-scroll-left)
1648 ;; down-mouse-2 stays as scroll-bar-drag.
1649 (define-key map [vertical-scroll-bar mouse-3] 'calendar-scroll-right)
1650 (define-key map [vertical-scroll-bar drag-mouse-3]
1651 'calendar-scroll-right))
1652 map)
1653 "Keymap for `calendar-mode'.")
1655 ;; Calendar mode is suitable only for specially formatted data.
1656 (put 'calendar-mode 'mode-class 'special)
1658 (defun calendar-mode-line-entry (command echo &optional key string)
1659 "Return a propertized string for `calendar-mode-line-format'.
1660 COMMAND is a command to run, ECHO is the help-echo text, KEY
1661 is COMMAND's keybinding, STRING describes the binding."
1662 (propertize (or key
1663 (substitute-command-keys
1664 (format "\\<calendar-mode-map>\\[%s] %s" command string)))
1665 'help-echo (format "mouse-1: %s" echo)
1666 'mouse-face 'mode-line-highlight
1667 'keymap (make-mode-line-mouse-map 'mouse-1 command)))
1669 ;; After calendar-mode-map.
1670 (defcustom calendar-mode-line-format
1671 (list
1672 (calendar-mode-line-entry 'calendar-scroll-right "previous month" "<")
1673 "Calendar"
1674 (concat
1675 (calendar-mode-line-entry 'calendar-goto-info-node "read Info on Calendar"
1676 nil "info")
1677 " / "
1678 (calendar-mode-line-entry 'calendar-other-month "choose another month"
1679 nil "other")
1680 " / "
1681 (calendar-mode-line-entry 'calendar-goto-today "go to today's date"
1682 nil "today"))
1683 '(calendar-date-string (calendar-current-date) t)
1684 (calendar-mode-line-entry 'calendar-scroll-left "next month" ">"))
1685 "If non-nil, the mode line of the calendar buffer.
1686 This is a list of items that evaluate to strings. The elements
1687 are evaluated and concatenated, evenly separated by blanks.
1688 During evaluation, the variable `date' is available as the date
1689 nearest the cursor (or today's date if that fails). To update
1690 the mode-line as the cursor moves, add
1691 `calendar-update-mode-line' to `calendar-move-hook'.
1693 If nil, do not modify the mode line at all.
1695 Here is an example that has the Hebrew date, the day number/days
1696 remaining in the year, and the ISO week/year numbers:
1698 (list
1699 \"\"
1700 '(calendar-hebrew-date-string date)
1701 '(let* ((year (calendar-extract-year date))
1702 (d (calendar-day-number date))
1703 (days-remaining
1704 (- (calendar-day-number (list 12 31 year)) d)))
1705 (format \"%d/%d\" d days-remaining))
1706 '(let* ((d (calendar-absolute-from-gregorian date))
1707 (iso-date (calendar-iso-from-absolute d)))
1708 (format \"ISO week %d of %d\"
1709 (calendar-extract-month iso-date)
1710 (calendar-extract-year iso-date)))
1711 \"\"))"
1712 :risky t
1713 :type 'sexp
1714 :group 'calendar)
1716 (defun calendar-goto-info-node ()
1717 "Go to the info node for the calendar."
1718 (interactive)
1719 (info "(emacs)Calendar/Diary")
1720 (fit-window-to-buffer))
1722 (defvar calendar-mark-ring nil
1723 "Used by `calendar-set-mark'.")
1725 (define-derived-mode calendar-mode nil "Calendar"
1726 "A major mode for the calendar window.
1727 For a complete description, see the info node `Calendar/Diary'.
1729 \\<calendar-mode-map>\\{calendar-mode-map}"
1730 (setq buffer-read-only t
1731 buffer-undo-list t
1732 indent-tabs-mode nil)
1733 (set (make-local-variable 'scroll-margin) 0) ; bug#10379
1734 (calendar-update-mode-line)
1735 (make-local-variable 'calendar-mark-ring)
1736 (make-local-variable 'displayed-month) ; month in middle of window
1737 (make-local-variable 'displayed-year) ; year in middle of window
1738 ;; Most functions only work if displayed-month and displayed-year are set,
1739 ;; so let's make sure they're always set. Most likely, this will be reset
1740 ;; soon in calendar-generate, but better safe than sorry.
1741 (unless (boundp 'displayed-month) (setq displayed-month 1))
1742 (unless (boundp 'displayed-year) (setq displayed-year 2001))
1743 (if (bound-and-true-p calendar-font-lock-keywords)
1744 (set (make-local-variable 'font-lock-defaults)
1745 '(calendar-font-lock-keywords t))))
1747 (defun calendar-string-spread (strings char length)
1748 "Concatenate list of STRINGS separated with copies of CHAR to fill LENGTH.
1749 The effect is like mapconcat but the separating pieces are as balanced as
1750 possible. Each item of STRINGS is evaluated before concatenation so it can
1751 actually be an expression that evaluates to a string. If LENGTH is too short,
1752 the STRINGS are just concatenated and the result truncated."
1753 ;; The algorithm is based on equation (3.25) on page 85 of Concrete
1754 ;; Mathematics by Ronald L. Graham, Donald E. Knuth, and Oren Patashnik,
1755 ;; Addison-Wesley, Reading, MA, 1989.
1756 (let* ((strings (mapcar 'eval
1757 (if (< (length strings) 2)
1758 (append (list "") strings (list ""))
1759 strings)))
1760 (n (- length (string-width (apply 'concat strings))))
1761 (m (* (1- (length strings)) (char-width char)))
1762 (s (car strings))
1763 (strings (cdr strings))
1764 (i 0))
1765 (dolist (string strings)
1766 (setq s (concat s
1767 (make-string (max 0 (/ (+ n i) m)) char)
1768 string)
1769 i (1+ i)))
1770 (truncate-string-to-width s length)))
1772 (defun calendar-update-mode-line ()
1773 "Update the calendar mode line with the current date and date style."
1774 (if (and calendar-mode-line-format
1775 (bufferp (get-buffer calendar-buffer)))
1776 (with-current-buffer calendar-buffer
1777 (let ((start (- calendar-left-margin 2))
1778 (date (condition-case nil
1779 (calendar-cursor-to-nearest-date)
1780 (error (calendar-current-date)))))
1781 (setq mode-line-format
1782 (concat (make-string (max 0 (+ start
1783 (- (car (window-inside-edges))
1784 (car (window-edges))))) ?\s)
1785 (calendar-string-spread
1786 (mapcar 'eval calendar-mode-line-format)
1787 ?\s (- calendar-right-margin (1- start))))))
1788 (force-mode-line-update))))
1790 (defun calendar-buffer-list ()
1791 "List of all calendar-related buffers (as buffers, not strings)."
1792 (let (buffs)
1793 (dolist (b (list calendar-hebrew-yahrzeit-buffer lunar-phases-buffer
1794 holiday-buffer diary-fancy-buffer solar-sunrises-buffer
1795 (get-file-buffer diary-file)
1796 calendar-buffer calendar-other-calendars-buffer))
1797 (and b (setq b (get-buffer b))
1798 (push b buffs)))
1799 buffs))
1801 (defun calendar-exit (&optional kill)
1802 "Get out of the calendar window and hide it and related buffers."
1803 (interactive "P")
1804 (let ((diary-buffer (get-file-buffer diary-file))
1805 (calendar-buffers (calendar-buffer-list)))
1806 (when (or (not diary-buffer)
1807 (not (buffer-modified-p diary-buffer))
1808 (yes-or-no-p
1809 "Diary modified; do you really want to exit the calendar? "))
1810 (if (and calendar-setup (display-multi-frame-p))
1811 ;; FIXME: replace this cruft with the `quit-restore' window property
1812 (dolist (w (window-list-1 nil nil t))
1813 (if (and (memq (window-buffer w) calendar-buffers)
1814 (window-dedicated-p w))
1815 (if (eq (window-deletable-p w) 'frame)
1816 (if calendar-remove-frame-by-deleting
1817 (delete-frame (window-frame w))
1818 (iconify-frame (window-frame w)))
1819 (quit-window kill w))))
1820 (dolist (b calendar-buffers)
1821 (quit-windows-on b kill))))))
1823 (defun calendar-current-date (&optional offset)
1824 "Return the current date in a list (month day year).
1825 Optional integer OFFSET is a number of days from the current date."
1826 (let* ((now (decode-time))
1827 (now (list (nth 4 now) (nth 3 now) (nth 5 now))))
1828 (if (zerop (or offset 0))
1829 now
1830 (calendar-gregorian-from-absolute
1831 (+ offset (calendar-absolute-from-gregorian now))))))
1833 (defun calendar-column-to-segment ()
1834 "Convert current column to calendar month \"segment\".
1835 The left-most month returns 0, the next right 1, and so on."
1836 (let ((col (max 0 (+ (current-column)
1837 (/ calendar-intermonth-spacing 2)
1838 (- calendar-left-margin)))))
1839 (/ col (+ (* 7 calendar-column-width) calendar-intermonth-spacing))))
1841 (defun calendar-cursor-to-date (&optional error event)
1842 "Return a list (month day year) of current cursor position.
1843 If cursor is not on a specific date, signals an error if optional parameter
1844 ERROR is non-nil, otherwise just returns nil.
1845 If EVENT is non-nil, it's an event indicating the buffer position to
1846 use instead of point."
1847 (with-current-buffer
1848 (if event (window-buffer (posn-window (event-start event)))
1849 (current-buffer))
1850 (save-excursion
1851 (and event (setq event (event-start event))
1852 (goto-char (posn-point event)))
1853 (let* ((segment (calendar-column-to-segment))
1854 (month (% (+ displayed-month (1- segment)) 12)))
1855 ;; Call with point on either of the two digits in a 2-digit date,
1856 ;; or on or before the digit of a 1-digit date.
1857 (if (not (and (looking-at "[ 0-9]?[0-9][^0-9]")
1858 (get-text-property (point) 'date)))
1859 (if error (user-error "Not on a date!"))
1860 ;; Convert segment to real month and year.
1861 (if (zerop month) (setq month 12))
1862 ;; Go back to before the first date digit.
1863 (or (looking-at " ")
1864 (re-search-backward "[^0-9]"))
1865 (list month
1866 (string-to-number
1867 (buffer-substring (1+ (point))
1868 (+ 1 calendar-day-digit-width (point))))
1869 (cond
1870 ((and (= 12 month) (zerop segment)) (1- displayed-year))
1871 ((and (= 1 month) (= segment 2)) (1+ displayed-year))
1872 (t displayed-year))))))))
1874 ;; The following version of calendar-gregorian-from-absolute is preferred for
1875 ;; reasons of clarity, BUT it's much slower than the version that follows it.
1877 ;;(defun calendar-gregorian-from-absolute (date)
1878 ;; "Compute the list (month day year) corresponding to the absolute DATE.
1879 ;;The absolute date is the number of days elapsed since the (imaginary)
1880 ;;Gregorian date Sunday, December 31, 1 BC."
1881 ;; (let* ((approx (/ date 366)) ; approximation from below
1882 ;; (year ; search forward from the approximation
1883 ;; (+ approx
1884 ;; (calendar-sum y approx
1885 ;; (>= date (calendar-absolute-from-gregorian (list 1 1 (1+ y))))
1886 ;; 1)))
1887 ;; (month ; search forward from January
1888 ;; (1+ (calendar-sum m 1
1889 ;; (> date
1890 ;; (calendar-absolute-from-gregorian
1891 ;; (list m (calendar-last-day-of-month m year) year)))
1892 ;; 1)))
1893 ;; (day ; calculate the day by subtraction
1894 ;; (- date
1895 ;; (1- (calendar-absolute-from-gregorian (list month 1 year))))))
1896 ;; (list month day year)))
1898 (defun calendar-gregorian-from-absolute (date)
1899 "Compute the list (month day year) corresponding to the absolute DATE.
1900 The absolute date is the number of days elapsed since the (imaginary)
1901 Gregorian date Sunday, December 31, 1 BC. This function does not
1902 handle dates in years BC."
1903 ;; See the footnote on page 384 of ``Calendrical Calculations, Part II:
1904 ;; Three Historical Calendars'' by E. M. Reingold, N. Dershowitz, and S. M.
1905 ;; Clamen, Software--Practice and Experience, Volume 23, Number 4
1906 ;; (April, 1993), pages 383-404 for an explanation.
1907 (let* ((d0 (1- date))
1908 (n400 (/ d0 146097))
1909 (d1 (% d0 146097))
1910 (n100 (/ d1 36524))
1911 (d2 (% d1 36524))
1912 (n4 (/ d2 1461))
1913 (d3 (% d2 1461))
1914 (n1 (/ d3 365))
1915 (day (1+ (% d3 365)))
1916 (year (+ (* 400 n400) (* 100 n100) (* n4 4) n1))
1917 (month 1)
1918 mdays)
1919 (if (or (= n100 4) (= n1 4))
1920 (list 12 31 year)
1921 (setq year (1+ year))
1922 (while (< (setq mdays (calendar-last-day-of-month month year)) day)
1923 (setq day (- day mdays)
1924 month (1+ month)))
1925 (list month day year))))
1927 (defun calendar-other-month (month year &optional event)
1928 "Display a three-month calendar centered around MONTH and YEAR.
1929 EVENT is an event like `last-nonmenu-event'."
1930 (interactive (let ((event (list last-nonmenu-event)))
1931 (append (calendar-read-date 'noday) event)))
1932 (save-selected-window
1933 (and event
1934 (setq event (event-start event))
1935 (select-window (posn-window event)))
1936 (unless (and (= month displayed-month)
1937 (= year displayed-year))
1938 (let ((old-date (calendar-cursor-to-date))
1939 (today (calendar-current-date)))
1940 (calendar-generate-window month year)
1941 (calendar-cursor-to-visible-date
1942 (cond
1943 ((calendar-date-is-visible-p old-date) old-date)
1944 ((calendar-date-is-visible-p today) today)
1945 (t (list month 1 year))))))))
1947 (defun calendar-set-mark (arg &optional event)
1948 "Mark the date under the cursor, or jump to marked date.
1949 With no prefix argument, push current date onto marked date ring.
1950 With argument ARG, jump to mark, pop it, and put point at end of ring."
1951 (interactive
1952 (list current-prefix-arg last-nonmenu-event))
1953 (let ((date (calendar-cursor-to-date t event)))
1954 (if arg
1955 (if (null calendar-mark-ring)
1956 (error "No mark set in this buffer")
1957 (calendar-goto-date (car calendar-mark-ring))
1958 (setq calendar-mark-ring
1959 (cdr (nconc calendar-mark-ring (list date)))))
1960 (push date calendar-mark-ring)
1961 ;; Since the top of the mark ring is the marked date in the
1962 ;; calendar, the mark ring in the calendar is one longer than
1963 ;; in other buffers to get the same effect.
1964 (if (> (length calendar-mark-ring) (1+ mark-ring-max))
1965 (setcdr (nthcdr mark-ring-max calendar-mark-ring) nil))
1966 (message "Mark set"))))
1968 (defun calendar-exchange-point-and-mark ()
1969 "Exchange the current cursor position with the marked date."
1970 (interactive)
1971 (let ((mark (car calendar-mark-ring))
1972 (date (calendar-cursor-to-date t)))
1973 (if (null mark)
1974 (error "No mark set in this buffer")
1975 (setq calendar-mark-ring (cons date (cdr calendar-mark-ring)))
1976 (calendar-goto-date mark))))
1978 (defun calendar-count-days-region ()
1979 "Count the number of days (inclusive) between point and the mark."
1980 (interactive)
1981 (let* ((days (- (calendar-absolute-from-gregorian
1982 (calendar-cursor-to-date t))
1983 (calendar-absolute-from-gregorian
1984 (or (car calendar-mark-ring)
1985 (error "No mark set in this buffer")))))
1986 (days (1+ (if (> days 0) days (- days)))))
1987 (message "Region has %d day%s (inclusive)"
1988 days (if (> days 1) "s" ""))))
1990 (defun calendar-not-implemented ()
1991 "Not implemented."
1992 (interactive)
1993 (error "%s not available in the calendar"
1994 (global-key-binding (this-command-keys))))
1996 (defun calendar-read (prompt acceptable &optional initial-contents)
1997 "Return an object read from the minibuffer.
1998 Prompt with the string PROMPT and use the function ACCEPTABLE to decide if
1999 entered item is acceptable. If non-nil, optional third arg INITIAL-CONTENTS
2000 is a string to insert in the minibuffer before reading."
2001 (let ((value (read-minibuffer prompt initial-contents)))
2002 (while (not (funcall acceptable value))
2003 (setq value (read-minibuffer prompt initial-contents)))
2004 value))
2007 (defun calendar-customized-p (symbol)
2008 "Return non-nil if SYMBOL has been customized."
2009 (and (default-boundp symbol)
2010 (let ((standard (get symbol 'standard-value)))
2011 (and standard
2012 (not (equal (eval (car standard)) (default-value symbol)))))))
2014 (defun calendar-abbrev-construct (full &optional maxlen)
2015 "From sequence FULL, return a vector of abbreviations.
2016 Each abbreviation is no longer than MAXLEN (default `calendar-abbrev-length')
2017 characters."
2018 (or maxlen (setq maxlen calendar-abbrev-length))
2019 (apply 'vector (mapcar
2020 (lambda (f)
2021 ;; TODO? truncate-string-to-width?
2022 (substring f 0 (min maxlen (length f))))
2023 full)))
2025 (defcustom calendar-day-name-array
2026 ["Sunday" "Monday" "Tuesday" "Wednesday" "Thursday" "Friday" "Saturday"]
2027 "Array of capitalized strings giving, in order from Sunday, the day names.
2028 If you change this without using customize after the calendar has loaded,
2029 then you may also want to change `calendar-day-abbrev-array'
2030 and `calendar-day-header-array'."
2031 :group 'calendar
2032 :initialize 'custom-initialize-default
2033 :set (lambda (symbol value)
2034 (let ((dcustomized (calendar-customized-p 'calendar-day-abbrev-array))
2035 (hcustomized (calendar-customized-p 'cal-html-day-abbrev-array))
2036 (ccustomized (calendar-customized-p 'calendar-day-header-array)))
2037 (set symbol value)
2038 (or dcustomized
2039 (setq calendar-day-abbrev-array
2040 (calendar-abbrev-construct calendar-day-name-array)))
2041 (and (not hcustomized)
2042 (boundp 'cal-html-day-abbrev-array)
2043 (setq cal-html-day-abbrev-array calendar-day-abbrev-array))
2044 (or ccustomized
2045 (equal calendar-day-header-array
2046 (setq calendar-day-header-array
2047 (calendar-day-header-construct)))
2048 (calendar-redraw))))
2049 :type '(vector (string :tag "Sunday")
2050 (string :tag "Monday")
2051 (string :tag "Tuesday")
2052 (string :tag "Wednesday")
2053 (string :tag "Thursday")
2054 (string :tag "Friday")
2055 (string :tag "Saturday")))
2057 (defcustom calendar-abbrev-length 3
2058 "Default length of abbreviations to use for day and month names.
2059 If you change this without using customize after the calendar has loaded,
2060 then you may also want to change `calendar-day-abbrev-array' and
2061 `calendar-month-abbrev-array'."
2062 :group 'calendar
2063 :initialize 'custom-initialize-default
2064 :set (lambda (symbol value)
2065 (let ((dcustomized (calendar-customized-p 'calendar-day-abbrev-array))
2066 (mcustomized (calendar-customized-p
2067 'calendar-month-abbrev-array))
2068 (hcustomized (calendar-customized-p 'cal-html-day-abbrev-array))
2069 (ccustomized (calendar-customized-p 'calendar-day-header-array)))
2070 (set symbol value)
2071 (or dcustomized
2072 (setq calendar-day-abbrev-array
2073 (calendar-abbrev-construct calendar-day-name-array)))
2074 (or mcustomized
2075 (setq calendar-month-abbrev-array
2076 (calendar-abbrev-construct calendar-month-name-array)))
2077 (and (not hcustomized)
2078 (boundp 'cal-html-day-abbrev-array)
2079 (setq cal-html-day-abbrev-array calendar-day-abbrev-array))
2080 (or ccustomized
2081 (equal calendar-day-header-array
2082 (setq calendar-day-header-array
2083 (calendar-day-header-construct)))
2084 (calendar-redraw))))
2085 :type 'integer)
2087 (defcustom calendar-day-abbrev-array
2088 (calendar-abbrev-construct calendar-day-name-array)
2089 "Array of capitalized strings giving the abbreviated day names.
2090 The order should be the same as that of the full names specified
2091 in `calendar-day-name-array'. These abbreviations may be used
2092 instead of the full names in the diary file. Do not include a
2093 trailing `.' in the strings specified in this variable, though
2094 you may use such in the diary file. By default, each string is
2095 the first `calendar-abbrev-length' characters of the corresponding
2096 full name."
2097 :group 'calendar
2098 :initialize 'custom-initialize-default
2099 :set-after '(calendar-abbrev-length calendar-day-name-array)
2100 :set (lambda (symbol value)
2101 (let ((hcustomized (calendar-customized-p 'cal-html-day-abbrev-array))
2102 (ccustomized (calendar-customized-p 'calendar-day-header-array)))
2103 (set symbol value)
2104 (and (not hcustomized)
2105 (boundp 'cal-html-day-abbrev-array)
2106 (setq cal-html-day-abbrev-array calendar-day-abbrev-array))
2107 (or ccustomized
2108 (equal calendar-day-header-array
2109 (setq calendar-day-header-array
2110 (calendar-day-header-construct)))
2111 (calendar-redraw))))
2112 :type '(vector (string :tag "Sun")
2113 (string :tag "Mon")
2114 (string :tag "Tue")
2115 (string :tag "Wed")
2116 (string :tag "Thu")
2117 (string :tag "Fri")
2118 (string :tag "Sat"))
2119 ;; Made defcustom, changed defaults from nil nil...
2120 :version "24.1")
2122 (defcustom calendar-day-header-array (calendar-day-header-construct)
2123 "Array of strings to use for the headers of the calendar's day columns.
2124 The order should be the same as in `calendar-day-name-array'.
2125 In use, the calendar truncates elements to no more than
2126 `calendar-day-header-width' columns wide.
2127 Emacs constructs the default from either `calendar-day-name-array'
2128 \(if `calendar-day-header-width' is more than `calendar-abbrev-length'),
2129 or from `calendar-day-abbrev-array' (assuming that the abbreviated
2130 name are more likely to be unique when truncated)."
2131 :group 'calendar
2132 :initialize 'custom-initialize-default
2133 :set-after '(calendar-day-header-width
2134 calendar-abbrev-length calendar-day-name-array
2135 calendar-day-abbrev-array)
2136 :set (lambda (symbol value)
2137 (or (equal calendar-day-header-array
2138 (set symbol value))
2139 (calendar-redraw)))
2140 :type '(vector (string :tag "Su")
2141 (string :tag "Mo")
2142 (string :tag "Tu")
2143 (string :tag "We")
2144 (string :tag "Th")
2145 (string :tag "Fr")
2146 (string :tag "Sa"))
2147 :version "24.4")
2149 (defcustom calendar-month-name-array
2150 ["January" "February" "March" "April" "May" "June"
2151 "July" "August" "September" "October" "November" "December"]
2152 "Array of capitalized strings giving, in order, the month names.
2153 If you change this without using customize after the calendar has loaded,
2154 then you may also want to change `calendar-month-abbrev-array'."
2155 :group 'calendar
2156 :initialize 'custom-initialize-default
2157 :set (lambda (symbol value)
2158 (let ((mcustomized (calendar-customized-p
2159 'calendar-month-abbrev-array)))
2160 (set symbol value)
2161 (or mcustomized
2162 (setq calendar-month-abbrev-array
2163 (calendar-abbrev-construct calendar-month-name-array)))))
2164 :type '(vector (string :tag "January")
2165 (string :tag "February")
2166 (string :tag "March")
2167 (string :tag "April")
2168 (string :tag "May")
2169 (string :tag "June")
2170 (string :tag "July")
2171 (string :tag "August")
2172 (string :tag "September")
2173 (string :tag "October")
2174 (string :tag "November")
2175 (string :tag "December")))
2177 (defcustom calendar-month-abbrev-array
2178 (calendar-abbrev-construct calendar-month-name-array)
2179 "Array of capitalized strings giving the abbreviated month names.
2180 The order should be the same as that of the full names specified
2181 in `calendar-month-name-array'. These abbreviations are used in
2182 the calendar menu entries, and can also be used in the diary
2183 file. Do not include a trailing `.' in the strings specified in
2184 this variable, though you may use such in the diary file. By
2185 default, each string is the first `calendar-abbrev-length'
2186 characters of the corresponding full name."
2187 :group 'calendar
2188 :set-after '(calendar-abbrev-length calendar-month-name-array)
2189 :type '(vector (string :tag "Jan")
2190 (string :tag "Feb")
2191 (string :tag "Mar")
2192 (string :tag "Apr")
2193 (string :tag "May")
2194 (string :tag "Jun")
2195 (string :tag "Jul")
2196 (string :tag "Aug")
2197 (string :tag "Sep")
2198 (string :tag "Oct")
2199 (string :tag "Nov")
2200 (string :tag "Dec"))
2201 ;; Made defcustom, changed defaults from nil nil...
2202 :version "24.1")
2204 (defun calendar-make-alist (sequence &optional start-index filter
2205 &rest sequences)
2206 "Return an association list corresponding to SEQUENCE.
2207 Associates each element of SEQUENCE with an incremented integer,
2208 starting from START-INDEX (default 1). Applies the function FILTER,
2209 if provided, to each key in the alist. Repeats the process, with
2210 indices starting from START-INDEX each time, for any remaining
2211 arguments SEQUENCES."
2212 (or start-index (setq start-index 1))
2213 (let (index alist)
2214 (mapc (lambda (seq)
2215 (setq index start-index)
2216 (mapc (lambda (elem)
2217 (setq alist (cons
2218 (cons (if filter (funcall filter elem) elem)
2219 index)
2220 alist)
2221 index (1+ index)))
2222 seq))
2223 (append (list sequence) sequences))
2224 (reverse alist)))
2226 (defun calendar-read-date (&optional noday)
2227 "Prompt for Gregorian date. Return a list (month day year).
2228 If optional NODAY is t, does not ask for day, but just returns
2229 \(month 1 year); if NODAY is any other non-nil value the value returned is
2230 \(month year)"
2231 (let* ((year (calendar-read
2232 "Year (>0): "
2233 (lambda (x) (> x 0))
2234 (number-to-string (calendar-extract-year
2235 (calendar-current-date)))))
2236 (month-array calendar-month-name-array)
2237 (completion-ignore-case t)
2238 (month (cdr (assoc-string
2239 (completing-read
2240 "Month name: "
2241 (mapcar 'list (append month-array nil))
2242 nil t)
2243 (calendar-make-alist month-array 1) t)))
2244 (last (calendar-last-day-of-month month year)))
2245 (if noday
2246 (if (eq noday t)
2247 (list month 1 year)
2248 (list month year))
2249 (list month
2250 (calendar-read (format "Day (1-%d): " last)
2251 (lambda (x) (and (< 0 x) (<= x last))))
2252 year))))
2254 (defun calendar-interval (mon1 yr1 mon2 yr2)
2255 "The number of months difference between MON1, YR1 and MON2, YR2.
2256 The result is positive if the second date is later than the first.
2257 Negative years are interpreted as years BC; -1 being 1 BC, and so on."
2258 (if (< yr1 0) (setq yr1 (1+ yr1))) ; -1 BC -> 0 AD, etc
2259 (if (< yr2 0) (setq yr2 (1+ yr2)))
2260 (+ (* 12 (- yr2 yr1))
2261 (- mon2 mon1)))
2263 (defvar calendar-font-lock-keywords nil
2264 "Default keywords to highlight in Calendar mode.")
2266 (make-obsolete-variable 'calendar-font-lock-keywords
2267 "set font-lock keywords in `calendar-mode-hook', \
2268 or customize calendar faces." "24.4")
2270 (defun calendar-day-name (date &optional abbrev absolute)
2271 "Return a string with the name of the day of the week of DATE.
2272 DATE should be a list in the format (MONTH DAY YEAR), unless the
2273 optional argument ABSOLUTE is non-nil, in which case DATE should
2274 be an integer in the range 0 to 6 corresponding to the day of the
2275 week. Day names are taken from the variable `calendar-day-name-array',
2276 unless the optional argument ABBREV is non-nil:
2277 `header' means to use `calendar-day-header-array';
2278 t to use `calendar-day-abbrev-array'."
2279 (aref (cond ((eq abbrev 'header) calendar-day-header-array)
2280 (abbrev calendar-day-abbrev-array)
2281 (t calendar-day-name-array))
2282 (if absolute date (calendar-day-of-week date))))
2284 (defun calendar-month-name (month &optional abbrev)
2285 "Return a string with the name of month number MONTH.
2286 Months are numbered from one. Month names are taken from the
2287 variable `calendar-month-name-array', unless the optional
2288 argument ABBREV is non-nil, in which case
2289 `calendar-month-abbrev-array' is used."
2290 (aref (if abbrev calendar-month-abbrev-array calendar-month-name-array)
2291 (1- month)))
2293 (defun calendar-day-of-week (date)
2294 "Return the day-of-the-week index of DATE, 0 for Sunday, 1 for Monday, etc.
2295 DATE is a list of the form (month day year). A negative year is
2296 interpreted as BC; -1 being 1 BC, and so on."
2297 (mod (calendar-absolute-from-gregorian date) 7))
2299 (defun calendar-week-end-day ()
2300 "Return the index (0 for Sunday, etc.) of the last day of the week."
2301 (mod (+ calendar-week-start-day 6) 7))
2303 (defun calendar-unmark ()
2304 "Delete all diary/holiday marks/highlighting from the calendar."
2305 (interactive)
2306 (setq calendar-mark-holidays-flag nil
2307 calendar-mark-diary-entries-flag nil)
2308 (with-current-buffer calendar-buffer
2309 (mapc 'delete-overlay (overlays-in (point-min) (point-max)))))
2311 (defun calendar-date-is-visible-p (date)
2312 "Return non-nil if DATE is valid and is visible in the calendar window."
2313 (and (calendar-date-is-valid-p date)
2314 (< (abs (calendar-interval
2315 displayed-month displayed-year
2316 (calendar-extract-month date) (calendar-extract-year date)))
2317 2)))
2319 ;; FIXME can this be generalized for holiday-chinese?
2320 (defun calendar-nongregorian-visible-p (month day toabs fromabs switch)
2321 "Return non-nil if MONTH, DAY is visible in the calendar window.
2322 MONTH and DAY are in some non-Gregorian calendar system. The
2323 functions TOABS and FROMABS convert that system to and from
2324 absolute, respectively. SWITCH is a function that takes a single
2325 argument (a local month number). It applies when the local year
2326 changes across the calendar window, and returns non-nil if the
2327 specified month should be associated with the higher year.
2328 Returns the corresponding Gregorian date."
2329 ;; We need to choose the local year associated with month and day
2330 ;; that might make them visible.
2331 (let* ((m1 displayed-month)
2332 (y1 displayed-year)
2333 (m2 displayed-month)
2334 (y2 displayed-year)
2335 ;; Absolute date of first/last dates in calendar window.
2336 (start-date (progn
2337 (calendar-increment-month m1 y1 -1)
2338 (calendar-absolute-from-gregorian (list m1 1 y1))))
2339 (end-date (progn
2340 (calendar-increment-month m2 y2 1)
2341 (calendar-absolute-from-gregorian
2342 (list m2 (calendar-last-day-of-month m2 y2) y2))))
2343 ;; Local date of first/last date in calendar window.
2344 (local-start (funcall fromabs start-date))
2345 (local-end (funcall fromabs end-date))
2346 ;; Local year of first/last dates.
2347 ;; Can only differ if displayed-month = 12, 1, 2.
2348 (local-y1 (calendar-extract-year local-start))
2349 (local-y2 (calendar-extract-year local-end))
2350 ;; Choose which year might be visible in the window.
2351 ;; Obviously it only matters when y1 and y2 differ, ie
2352 ;; when the _local_ new year is visible.
2353 (year (if (funcall switch month) local-y2 local-y1))
2354 (date (calendar-gregorian-from-absolute
2355 (funcall toabs (list month day year)))))
2356 (if (calendar-date-is-visible-p date)
2357 date)))
2359 (defun calendar-date-is-valid-p (date)
2360 "Return t if DATE is a valid date."
2361 (let ((month (calendar-extract-month date))
2362 (day (calendar-extract-day date))
2363 (year (calendar-extract-year date)))
2364 (and (<= 1 month) (<= month 12)
2365 ;; (calendar-read-date t) used to return a date with day = nil.
2366 ;; Should not be valid (?), since many funcs prob assume integer.
2367 ;; (calendar-read-date 'noday) returns (month year), which
2368 ;; currently results in calendar-extract-year returning nil.
2369 day year (<= 1 day) (<= day (calendar-last-day-of-month month year))
2370 ;; BC dates left as non-valid, to suppress errors from
2371 ;; complex holiday algorithms not suitable for years BC.
2372 ;; Note there are side effects on calendar navigation.
2373 (<= 1 year))))
2375 (defun calendar-date-equal (date1 date2)
2376 "Return t if the DATE1 and DATE2 are the same."
2377 (and
2378 (= (calendar-extract-month date1) (calendar-extract-month date2))
2379 (= (calendar-extract-day date1) (calendar-extract-day date2))
2380 (= (calendar-extract-year date1) (calendar-extract-year date2))))
2382 (defun calendar-make-temp-face (attrlist)
2383 "Return a temporary face based on the attributes in ATTRLIST.
2384 ATTRLIST is a list with elements of the form :face face :foreground color."
2385 (let ((attrs attrlist)
2386 faceinfo face temp-face)
2387 ;; Separate :face from the other attributes. Use the last :face
2388 ;; if there are more than one. FIXME is merging meaningful?
2389 (while attrs
2390 (if (eq (car attrs) :face)
2391 (setq face (intern-soft (cadr attrs))
2392 attrs (cddr attrs))
2393 (push (car attrs) faceinfo)
2394 (setq attrs (cdr attrs))))
2395 (or (facep face) (setq face 'default))
2396 (if (not faceinfo)
2397 ;; No attributes to apply, so just use an existing-face.
2398 face
2399 ;; FIXME should we be using numbered temp-faces, re-using where poss?
2400 (setq temp-face
2401 (make-symbol
2402 (concat ":caltemp"
2403 (mapconcat (lambda (sym)
2404 (cond
2405 ((symbolp sym) (symbol-name sym))
2406 ((numberp sym) (number-to-string sym))
2407 (t sym)))
2408 attrlist ""))))
2409 (make-face temp-face)
2410 (copy-face face temp-face)
2411 ;; Apply the font aspects.
2412 (apply 'set-face-attribute temp-face nil (nreverse faceinfo))
2413 temp-face)))
2415 (defun calendar-mark-visible-date (date &optional mark)
2416 "Mark DATE in the calendar window with MARK.
2417 MARK is a single-character string, a list of face attributes/values, or a face.
2418 MARK defaults to `diary-entry-marker'."
2419 (if (calendar-date-is-valid-p date)
2420 (with-current-buffer calendar-buffer
2421 (save-excursion
2422 (calendar-cursor-to-visible-date date)
2423 (setq mark
2424 (or (and (stringp mark) (= (length mark) 1) mark) ; single-char
2425 ;; The next two use to also check font-lock-mode.
2426 ;; See comments above diary-entry-marker for why
2427 ;; this was dropped.
2428 ;;; (and font-lock-mode
2429 ;;; (or
2430 (and (listp mark) (> (length mark) 0) mark) ; attrs
2431 (and (facep mark) mark) ; )) face-name
2432 diary-entry-marker))
2433 (cond
2434 ;; Face or an attr-list that contained a face.
2435 ((facep mark)
2436 (overlay-put
2437 (make-overlay (1- (point)) (1+ (point))) 'face mark))
2438 ;; Single-character mark, goes after the date.
2439 ((and (stringp mark) (= (length mark) 1))
2440 (overlay-put
2441 (make-overlay (1+ (point)) (+ 2 (point))) 'display mark))
2442 (t ; attr list
2443 (overlay-put
2444 (make-overlay (1- (point)) (1+ (point))) 'face
2445 (calendar-make-temp-face mark))))))))
2447 (defun calendar-star-date ()
2448 "Replace the date under the cursor in the calendar window with asterisks.
2449 You might want to add this function to `calendar-today-visible-hook'."
2450 (unless (catch 'found
2451 (dolist (ol (overlays-at (point)))
2452 (and (overlay-get ol 'calendar-star)
2453 (throw 'found t))))
2454 (let ((ol (make-overlay (1- (point)) (point))))
2455 (overlay-put ol 'display "*")
2456 (overlay-put ol 'calendar-star t)
2457 ;; Use copy-sequence to avoid merging of identical 'display props.
2458 ;; Use two overlays so as not to mess up
2459 ;; calendar-cursor-to-nearest-date (and calendar-forward-day).
2460 (overlay-put (setq ol (make-overlay (point) (1+ (point))))
2461 'display (copy-sequence "*"))
2462 (overlay-put ol 'calendar-star t))))
2464 (defun calendar-mark-today ()
2465 "Mark the date under the cursor in the calendar window.
2466 The date is marked with `calendar-today-marker'. You might want to add
2467 this function to `calendar-today-visible-hook'."
2468 (calendar-mark-visible-date (calendar-cursor-to-date) calendar-today-marker))
2470 ;; FIXME why the car? Almost every usage calls list on the args.
2471 (defun calendar-date-compare (date1 date2)
2472 "Return t if DATE1 is before DATE2, nil otherwise.
2473 The actual dates are in the car of DATE1 and DATE2."
2474 (< (calendar-absolute-from-gregorian (car date1))
2475 (calendar-absolute-from-gregorian (car date2))))
2477 (defun calendar-date-string (date &optional abbreviate nodayname)
2478 "A string form of DATE, driven by the variable `calendar-date-display-form'.
2479 An optional parameter ABBREVIATE, when non-nil, causes the month
2480 and day names to be abbreviated as specified by
2481 `calendar-month-abbrev-array' and `calendar-day-abbrev-array',
2482 respectively. An optional parameter NODAYNAME, when t, omits the
2483 name of the day of the week."
2484 (let* ((dayname (unless nodayname (calendar-day-name date abbreviate)))
2485 (month (calendar-extract-month date))
2486 (monthname (calendar-month-name month abbreviate))
2487 (day (number-to-string (calendar-extract-day date)))
2488 (month (number-to-string month))
2489 (year (number-to-string (calendar-extract-year date))))
2490 (mapconcat 'eval calendar-date-display-form "")))
2492 (defun calendar-dayname-on-or-before (dayname date)
2493 "Return the absolute date of the DAYNAME on or before absolute DATE.
2494 DAYNAME=0 means Sunday, DAYNAME=1 means Monday, and so on.
2496 Note: Applying this function to d+6 gives us the DAYNAME on or after an
2497 absolute day d. Similarly, applying it to d+3 gives the DAYNAME nearest to
2498 absolute date d, applying it to d-1 gives the DAYNAME previous to absolute
2499 date d, and applying it to d+7 gives the DAYNAME following absolute date d."
2500 (- date (% (- date dayname) 7)))
2502 (defun calendar-nth-named-absday (n dayname month year &optional day)
2503 "Absolute date of the Nth DAYNAME after/before MONTH YEAR DAY.
2504 A DAYNAME of 0 means Sunday, 1 means Monday, and so on.
2505 If N>0, return the Nth DAYNAME after MONTH DAY, YEAR (inclusive).
2506 If N<0, return the Nth DAYNAME before MONTH DAY, YEAR (inclusive).
2507 DAY defaults to 1 if N>0, and MONTH's last day otherwise."
2508 (if (> n 0)
2509 (+ (* 7 (1- n))
2510 (calendar-dayname-on-or-before
2511 dayname
2512 (+ 6 (calendar-absolute-from-gregorian
2513 (list month (or day 1) year)))))
2514 (+ (* 7 (1+ n))
2515 (calendar-dayname-on-or-before
2516 dayname
2517 (calendar-absolute-from-gregorian
2518 (list month
2519 (or day (calendar-last-day-of-month month year))
2520 year))))))
2522 (defun calendar-nth-named-day (n dayname month year &optional day)
2523 "Date of the Nth DAYNAME after/before MONTH YEAR DAY.
2524 Like `calendar-nth-named-absday', but returns a Gregorian date."
2525 (calendar-gregorian-from-absolute
2526 (calendar-nth-named-absday n dayname month year day)))
2528 (defun calendar-day-of-year-string (&optional date)
2529 "String of day number of year of Gregorian DATE.
2530 Defaults to today's date if DATE is not given."
2531 (let* ((d (or date (calendar-current-date)))
2532 (year (calendar-extract-year d))
2533 (day (calendar-day-number d))
2534 (days-remaining (- (calendar-day-number (list 12 31 year)) day)))
2535 (format "Day %d of %d; %d day%s remaining in the year"
2536 day year days-remaining (if (= days-remaining 1) "" "s"))))
2538 (defun calendar-other-dates (date)
2539 "Return a list of strings giving Gregorian DATE in other calendars.
2540 DATE is (month day year). Calendars that do not apply are omitted."
2541 (let (odate)
2542 (delq nil
2543 (list
2544 (calendar-day-of-year-string date)
2545 (format "ISO date: %s" (calendar-iso-date-string date))
2546 (format "Julian date: %s"
2547 (calendar-julian-date-string date))
2548 (format "Astronomical (Julian) day number (at noon UTC): %s.0"
2549 (calendar-astro-date-string date))
2550 (format "Fixed (RD) date: %s"
2551 (calendar-absolute-from-gregorian date))
2552 (format "Hebrew date (before sunset): %s"
2553 (calendar-hebrew-date-string date))
2554 (format "Persian date: %s"
2555 (calendar-persian-date-string date))
2556 (unless (string-equal
2557 (setq odate (calendar-islamic-date-string date))
2558 "")
2559 (format "Islamic date (before sunset): %s" odate))
2560 (unless (string-equal
2561 (setq odate (calendar-bahai-date-string date))
2562 "")
2563 (format "Bahá'í date: %s" odate))
2564 (format "Chinese date: %s"
2565 (calendar-chinese-date-string date))
2566 (unless (string-equal
2567 (setq odate (calendar-coptic-date-string date))
2568 "")
2569 (format "Coptic date: %s" odate))
2570 (unless (string-equal
2571 (setq odate (calendar-ethiopic-date-string date))
2572 "")
2573 (format "Ethiopic date: %s" odate))
2574 (unless (string-equal
2575 (setq odate (calendar-french-date-string date))
2576 "")
2577 (format "French Revolutionary date: %s" odate))
2578 (format "Mayan date: %s"
2579 (calendar-mayan-date-string date))))))
2581 (declare-function x-popup-menu "menu.c" (position menu))
2583 (defun calendar-print-other-dates (&optional event)
2584 "Show dates on other calendars for date under the cursor.
2585 If called by a mouse-event, pops up a menu with the result."
2586 (interactive (list last-nonmenu-event))
2587 (let* ((date (calendar-cursor-to-date t event))
2588 (title (format "%s (Gregorian)" (calendar-date-string date)))
2589 (others (calendar-other-dates date))
2590 selection)
2591 (if (mouse-event-p event)
2592 (and (setq selection (cal-menu-x-popup-menu event title
2593 (mapcar 'list others)))
2594 (call-interactively selection))
2595 (calendar-in-read-only-buffer calendar-other-calendars-buffer
2596 (calendar-set-mode-line title)
2597 (insert (mapconcat 'identity others "\n"))))))
2599 (defun calendar-print-day-of-year ()
2600 "Show day number in year/days remaining in year for date under the cursor."
2601 (interactive)
2602 (message "%s" (calendar-day-of-year-string (calendar-cursor-to-date t))))
2604 (defun calendar-set-mode-line (str)
2605 "Set mode line to STR, centered, surrounded by dashes."
2606 (let* ((edges (window-edges))
2607 ;; As per doc of window-width, total visible mode-line length.
2608 (width (- (nth 2 edges) (car edges))))
2609 ;; Hack for --daemon. See bug #2199.
2610 ;; If no frame exists yet, we have no idea what width to use.
2611 (and (= width 10)
2612 (not window-system)
2613 (setq width (string-to-number (or (getenv "COLUMNS") "80"))))
2614 (setq mode-line-format
2615 (if buffer-file-name
2616 `("-" mode-line-modified
2617 ,(calendar-string-spread (list str) ?- (- width 6))
2618 "---")
2619 (calendar-string-spread (list str) ?- width)))))
2621 (run-hooks 'calendar-load-hook)
2623 (provide 'calendar)
2625 ;; Local variables:
2626 ;; byte-compile-dynamic: t
2627 ;; coding: utf-8
2628 ;; End:
2630 ;;; calendar.el ends here