[bpt/emacs.git] / lisp / calendar / cal-move.el

;;; cal-move.el --- calendar functions for movement in the calendar

;; Copyright (C) 1995, 2005  Free Software Foundation, Inc.

;; Author: Edward M. Reingold <reingold@cs.uiuc.edu>
;; Maintainer: Glenn Morris <rgm@gnu.org>
;; Keywords: calendar
;; Human-Keywords: calendar

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.

;;; Commentary:

;; This collection of functions implements movement in the calendar for
;; calendar.el.

;; Comments, corrections, and improvements should be sent to
;;  Edward M. Reingold               Department of Computer Science
;;  (217) 333-6733                   University of Illinois at Urbana-Champaign
;;  reingold@cs.uiuc.edu             1304 West Springfield Avenue
;;                                   Urbana, Illinois 61801

;;; Code:

(defvar displayed-month)
(defvar displayed-year)

(require 'calendar)

(defun calendar-goto-today ()
  "Reposition the calendar window so the current date is visible."
  (interactive)
  (let ((today (calendar-current-date)));; The date might have changed.
    (if (not (calendar-date-is-visible-p today))
        (generate-calendar-window)
      (update-calendar-mode-line)
      (calendar-cursor-to-visible-date today)))
  (run-hooks 'calendar-move-hook))

(defun calendar-forward-month (arg)
  "Move the cursor forward ARG months.
Movement is backward if ARG is negative."
  (interactive "p")
  (calendar-cursor-to-nearest-date)
  (let* ((cursor-date (calendar-cursor-to-date t))
         (month (extract-calendar-month cursor-date))
         (day (extract-calendar-day cursor-date))
         (year (extract-calendar-year cursor-date)))
    (increment-calendar-month month year arg)
    (let ((last (calendar-last-day-of-month month year)))
      (if (< last day)
        (setq day last)))
    ;; Put the new month on the screen, if needed, and go to the new date.
    (let ((new-cursor-date (list month day year)))
      (if (not (calendar-date-is-visible-p new-cursor-date))
          (calendar-other-month month year))
      (calendar-cursor-to-visible-date new-cursor-date)))
  (run-hooks 'calendar-move-hook))

(defun calendar-forward-year (arg)
  "Move the cursor forward by ARG years.
Movement is backward if ARG is negative."
  (interactive "p")
  (calendar-forward-month (* 12 arg)))

(defun calendar-backward-month (arg)
  "Move the cursor backward by ARG months.
Movement is forward if ARG is negative."
  (interactive "p")
  (calendar-forward-month (- arg)))

(defun calendar-backward-year (arg)
  "Move the cursor backward ARG years.
Movement is forward is ARG is negative."
  (interactive "p")
  (calendar-forward-month (* -12 arg)))

(defun scroll-calendar-left (&optional arg)
  "Scroll the displayed calendar left by ARG months.
If ARG is negative the calendar is scrolled right.  Maintains the relative
position of the cursor with respect to the calendar as well as possible."
  (interactive "p")
  (unless arg (setq arg 1))
  (calendar-cursor-to-nearest-date)
  (let ((old-date (calendar-cursor-to-date))
        (today (calendar-current-date)))
    (if (/= arg 0)
        (let ((month displayed-month)
	      (year displayed-year))
          (increment-calendar-month month year arg)
	  (generate-calendar-window month year)
          (calendar-cursor-to-visible-date
           (cond
            ((calendar-date-is-visible-p old-date) old-date)
            ((calendar-date-is-visible-p today) today)
            (t (list month 1 year)))))))
  (run-hooks 'calendar-move-hook))

(defun scroll-calendar-right (&optional arg)
  "Scroll the displayed calendar window right by ARG months.
If ARG is negative the calendar is scrolled left.  Maintains the relative
position of the cursor with respect to the calendar as well as possible."
  (interactive "p")
  (scroll-calendar-left (- (or arg 1))))

(defun scroll-calendar-left-three-months (arg)
  "Scroll the displayed calendar window left by 3*ARG months.
If ARG is negative the calendar is scrolled right.  Maintains the relative
position of the cursor with respect to the calendar as well as possible."
  (interactive "p")
  (scroll-calendar-left (* 3 arg)))

(defun scroll-calendar-right-three-months (arg)
  "Scroll the displayed calendar window right by 3*ARG months.
If ARG is negative the calendar is scrolled left.  Maintains the relative
position of the cursor with respect to the calendar as well as possible."
  (interactive "p")
  (scroll-calendar-left (* -3 arg)))

(defun calendar-cursor-to-nearest-date ()
  "Move the cursor to the closest date.
The position of the cursor is unchanged if it is already on a date.
Returns the list (month day year) giving the cursor position."
  (let ((date (calendar-cursor-to-date))
        (column (current-column)))
    (if date
        date
      (if (> 3 (count-lines (point-min) (point)))
          (progn
            (goto-line 3)
            (move-to-column column)))
      (if (not (looking-at "[0-9]"))
          (if (and (not (looking-at " *$"))
                   (or (< column 25)
                       (and (> column 27)
                            (< column 50))
                       (and (> column 52)
                            (< column 75))))
              (progn
                (re-search-forward "[0-9]" nil t)
                (backward-char 1))
            (re-search-backward "[0-9]" nil t)))
      (calendar-cursor-to-date))))

(defun calendar-forward-day (arg)
  "Move the cursor forward ARG days.
Moves backward if ARG is negative."
  (interactive "p")
  (if (/= 0 arg)
      (let*
          ((cursor-date (calendar-cursor-to-date))
           (cursor-date (if cursor-date
                            cursor-date
                          (if (> arg 0) (setq arg (1- arg)))
                          (calendar-cursor-to-nearest-date)))
           (new-cursor-date
            (calendar-gregorian-from-absolute
             (+ (calendar-absolute-from-gregorian cursor-date) arg)))
           (new-display-month (extract-calendar-month new-cursor-date))
           (new-display-year (extract-calendar-year new-cursor-date)))
        ;; Put the new month on the screen, if needed, and go to the new date.
        (if (not (calendar-date-is-visible-p new-cursor-date))
            (calendar-other-month new-display-month new-display-year))
        (calendar-cursor-to-visible-date new-cursor-date)))
  (run-hooks 'calendar-move-hook))

(defun calendar-backward-day (arg)
  "Move the cursor back ARG days.
Moves forward if ARG is negative."
  (interactive "p")
  (calendar-forward-day (- arg)))

(defun calendar-forward-week (arg)
  "Move the cursor forward ARG weeks.
Moves backward if ARG is negative."
  (interactive "p")
  (calendar-forward-day (* arg 7)))

(defun calendar-backward-week (arg)
  "Move the cursor back ARG weeks.
Moves forward if ARG is negative."
  (interactive "p")
  (calendar-forward-day (* arg -7)))

(defun calendar-beginning-of-week (arg)
  "Move the cursor back ARG calendar-week-start-day's."
  (interactive "p")
  (calendar-cursor-to-nearest-date)
  (let ((day (calendar-day-of-week (calendar-cursor-to-date))))
    (calendar-backward-day
     (if (= day calendar-week-start-day)
         (* 7 arg)
       (+ (mod (- day calendar-week-start-day) 7)
          (* 7 (1- arg)))))))

(defun calendar-end-of-week (arg)
  "Move the cursor forward ARG calendar-week-start-day+6's."
  (interactive "p")
  (calendar-cursor-to-nearest-date)
  (let ((day (calendar-day-of-week (calendar-cursor-to-date))))
    (calendar-forward-day
     (if (= day (mod (1- calendar-week-start-day) 7))
         (* 7 arg)
       (+ (- 6 (mod (- day calendar-week-start-day) 7))
          (* 7 (1- arg)))))))

(defun calendar-beginning-of-month (arg)
  "Move the cursor backward ARG month beginnings."
  (interactive "p")
  (calendar-cursor-to-nearest-date)
  (let* ((date (calendar-cursor-to-date))
         (month (extract-calendar-month date))
         (day (extract-calendar-day date))
         (year (extract-calendar-year date)))
    (if (= day 1)
        (calendar-backward-month arg)
      (calendar-cursor-to-visible-date (list month 1 year))
      (calendar-backward-month (1- arg)))))

(defun calendar-end-of-month (arg)
  "Move the cursor forward ARG month ends."
  (interactive "p")
  (calendar-cursor-to-nearest-date)
  (let* ((date (calendar-cursor-to-date))
         (month (extract-calendar-month date))
         (day (extract-calendar-day date))
         (year (extract-calendar-year date))
         (last-day (calendar-last-day-of-month month year)))
    (if (/= day last-day)
        (progn
          (calendar-cursor-to-visible-date (list month last-day year))
          (setq arg (1- arg))))
    (increment-calendar-month month year arg)
    (let ((last-day (list
                     month
                     (calendar-last-day-of-month month year)
                     year)))
      (if (not (calendar-date-is-visible-p last-day))
          (calendar-other-month month year)
      (calendar-cursor-to-visible-date last-day))))
  (run-hooks 'calendar-move-hook))

(defun calendar-beginning-of-year (arg)
  "Move the cursor backward ARG year beginnings."
  (interactive "p")
  (calendar-cursor-to-nearest-date)
  (let* ((date (calendar-cursor-to-date))
         (month (extract-calendar-month date))
         (day (extract-calendar-day date))
         (year (extract-calendar-year date))
         (jan-first (list 1 1 year))
         (calendar-move-hook nil))
    (if (and (= day 1) (= 1 month))
        (calendar-backward-month (* 12 arg))
      (if (and (= arg 1)
               (calendar-date-is-visible-p jan-first))
          (calendar-cursor-to-visible-date jan-first)
        (calendar-other-month 1 (- year (1- arg)))
        (calendar-cursor-to-visible-date (list 1 1 displayed-year)))))
  (run-hooks 'calendar-move-hook))

(defun calendar-end-of-year (arg)
  "Move the cursor forward ARG year beginnings."
  (interactive "p")
  (calendar-cursor-to-nearest-date)
  (let* ((date (calendar-cursor-to-date))
         (month (extract-calendar-month date))
         (day (extract-calendar-day date))
         (year (extract-calendar-year date))
         (dec-31 (list 12 31 year))
         (calendar-move-hook nil))
    (if (and (= day 31) (= 12 month))
        (calendar-forward-month (* 12 arg))
      (if (and (= arg 1)
               (calendar-date-is-visible-p dec-31))
          (calendar-cursor-to-visible-date dec-31)
        (calendar-other-month 12 (+ year (1- arg)))
        (calendar-cursor-to-visible-date (list 12 31 displayed-year)))))
  (run-hooks 'calendar-move-hook))

(defun calendar-cursor-to-visible-date (date)
  "Move the cursor to DATE that is on the screen."
  (let* ((month (extract-calendar-month date))
	 (day (extract-calendar-day date))
	 (year (extract-calendar-year date))
	 (first-of-month-weekday (calendar-day-of-week (list month 1 year))))
    (goto-line (+ 3
		  (/ (+ day  -1
                        (mod
                         (- (calendar-day-of-week (list month 1 year))
                            calendar-week-start-day)
                         7))
                     7)))
    (move-to-column (+ 6
		       (* 25
			  (1+ (calendar-interval
			       displayed-month displayed-year month year)))
		       (* 3 (mod
                             (- (calendar-day-of-week date)
                                calendar-week-start-day)
                             7))))))

(defun calendar-goto-date (date)
  "Move cursor to DATE."
  (interactive (list (calendar-read-date)))
  (let ((month (extract-calendar-month date))
        (year (extract-calendar-year date)))
    (if (not (calendar-date-is-visible-p date))
        (calendar-other-month
         (if (and (= month 1) (= year 1))
             2
           month)
         year)))
  (calendar-cursor-to-visible-date date)
  (run-hooks 'calendar-move-hook))

(defun calendar-goto-day-of-year (year day &optional noecho)
  "Move cursor to YEAR, DAY number; echo DAY/YEAR unless NOECHO is t.
Negative DAY counts backward from end of year."
  (interactive
   (let* ((year (calendar-read
                 "Year (>0): "
                 (lambda (x) (> x 0))
                 (int-to-string (extract-calendar-year
                                 (calendar-current-date)))))
          (last (if (calendar-leap-year-p year) 366 365))
          (day (calendar-read
                (format "Day number (+/- 1-%d): " last)
                '(lambda (x) (and (<= 1 (abs x)) (<= (abs x) last))))))
     (list year day)))
  (calendar-goto-date
   (calendar-gregorian-from-absolute
    (if (< 0 day)
        (+ -1 day (calendar-absolute-from-gregorian (list 1 1 year)))
      (+ 1 day (calendar-absolute-from-gregorian (list 12 31 year))))))
  (or noecho (calendar-print-day-of-year)))

(provide 'cal-move)

;;; arch-tag: d0883c46-7e16-4914-8ff8-8f67e699b781
;;; cal-move.el ends here
Commit	Line	Data
0808d911 ER	1	;;; cal-move.el --- calendar functions for movement in the calendar
0808d911 ER	2
25b11e01	3	;; Copyright (C) 1995, 2005 Free Software Foundation, Inc.
0808d911 ER	4
0808d911 ER	5	;; Author: Edward M. Reingold <reingold@cs.uiuc.edu>
aff88519	6	;; Maintainer: Glenn Morris <rgm@gnu.org>
0808d911 ER	7	;; Keywords: calendar
	8	;; Human-Keywords: calendar
	9
	10	;; This file is part of GNU Emacs.
	11
	12	;; GNU Emacs is free software; you can redistribute it and/or modify
	13	;; it under the terms of the GNU General Public License as published by
	14	;; the Free Software Foundation; either version 2, or (at your option)
	15	;; any later version.
	16
	17	;; GNU Emacs is distributed in the hope that it will be useful,
	18	;; but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	;; GNU General Public License for more details.
	21
	22	;; You should have received a copy of the GNU General Public License
b578f267	23	;; along with GNU Emacs; see the file COPYING. If not, write to the
3a35cf56 LK	24	;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
3a35cf56 LK	25	;; Boston, MA 02110-1301, USA.
0808d911 ER	26
	27	;;; Commentary:
	28
	29	;; This collection of functions implements movement in the calendar for
	30	;; calendar.el.
	31
	32	;; Comments, corrections, and improvements should be sent to
	33	;; Edward M. Reingold Department of Computer Science
	34	;; (217) 333-6733 University of Illinois at Urbana-Champaign
	35	;; reingold@cs.uiuc.edu 1304 West Springfield Avenue
	36	;; Urbana, Illinois 61801
	37
	38	;;; Code:
	39
0b0f8fa4 GM	40	(defvar displayed-month)
	41	(defvar displayed-year)
	42
20eff799 RS	43	(require 'calendar)
20eff799 RS	44
0808d911 ER	45	(defun calendar-goto-today ()
	46	"Reposition the calendar window so the current date is visible."
	47	(interactive)
	48	(let ((today (calendar-current-date)));; The date might have changed.
	49	(if (not (calendar-date-is-visible-p today))
	50	(generate-calendar-window)
	51	(update-calendar-mode-line)
d2e8c33b RS	52	(calendar-cursor-to-visible-date today)))
d2e8c33b RS	53	(run-hooks 'calendar-move-hook))
0808d911 ER	54
	55	(defun calendar-forward-month (arg)
	56	"Move the cursor forward ARG months.
	57	Movement is backward if ARG is negative."
	58	(interactive "p")
	59	(calendar-cursor-to-nearest-date)
	60	(let* ((cursor-date (calendar-cursor-to-date t))
	61	(month (extract-calendar-month cursor-date))
	62	(day (extract-calendar-day cursor-date))
	63	(year (extract-calendar-year cursor-date)))
	64	(increment-calendar-month month year arg)
	65	(let ((last (calendar-last-day-of-month month year)))
	66	(if (< last day)
	67	(setq day last)))
	68	;; Put the new month on the screen, if needed, and go to the new date.
	69	(let ((new-cursor-date (list month day year)))
	70	(if (not (calendar-date-is-visible-p new-cursor-date))
	71	(calendar-other-month month year))
d2e8c33b RS	72	(calendar-cursor-to-visible-date new-cursor-date)))
d2e8c33b RS	73	(run-hooks 'calendar-move-hook))
0808d911 ER	74
	75	(defun calendar-forward-year (arg)
	76	"Move the cursor forward by ARG years.
	77	Movement is backward if ARG is negative."
	78	(interactive "p")
	79	(calendar-forward-month (* 12 arg)))
	80
	81	(defun calendar-backward-month (arg)
	82	"Move the cursor backward by ARG months.
	83	Movement is forward if ARG is negative."
	84	(interactive "p")
	85	(calendar-forward-month (- arg)))
	86
	87	(defun calendar-backward-year (arg)
	88	"Move the cursor backward ARG years.
	89	Movement is forward is ARG is negative."
	90	(interactive "p")
	91	(calendar-forward-month (* -12 arg)))
	92
f7b37bae	93	(defun scroll-calendar-left (&optional arg)
0808d911 ER	94	"Scroll the displayed calendar left by ARG months.
	95	If ARG is negative the calendar is scrolled right. Maintains the relative
	96	position of the cursor with respect to the calendar as well as possible."
	97	(interactive "p")
f7b37bae	98	(unless arg (setq arg 1))
0808d911 ER	99	(calendar-cursor-to-nearest-date)
	100	(let ((old-date (calendar-cursor-to-date))
	101	(today (calendar-current-date)))
	102	(if (/= arg 0)
9aa84f7f AS	103	(let ((month displayed-month)
	104	(year displayed-year))
	105	(increment-calendar-month month year arg)
	106	(generate-calendar-window month year)
0808d911 ER	107	(calendar-cursor-to-visible-date
	108	(cond
	109	((calendar-date-is-visible-p old-date) old-date)
	110	((calendar-date-is-visible-p today) today)
d2e8c33b RS	111	(t (list month 1 year)))))))
d2e8c33b RS	112	(run-hooks 'calendar-move-hook))
0808d911	113
f7b37bae	114	(defun scroll-calendar-right (&optional arg)
0808d911 ER	115	"Scroll the displayed calendar window right by ARG months.
	116	If ARG is negative the calendar is scrolled left. Maintains the relative
	117	position of the cursor with respect to the calendar as well as possible."
	118	(interactive "p")
f7b37bae	119	(scroll-calendar-left (- (or arg 1))))
0808d911 ER	120
	121	(defun scroll-calendar-left-three-months (arg)
	122	"Scroll the displayed calendar window left by 3*ARG months.
	123	If ARG is negative the calendar is scrolled right. Maintains the relative
	124	position of the cursor with respect to the calendar as well as possible."
	125	(interactive "p")
	126	(scroll-calendar-left (* 3 arg)))
	127
	128	(defun scroll-calendar-right-three-months (arg)
	129	"Scroll the displayed calendar window right by 3*ARG months.
	130	If ARG is negative the calendar is scrolled left. Maintains the relative
	131	position of the cursor with respect to the calendar as well as possible."
	132	(interactive "p")
	133	(scroll-calendar-left (* -3 arg)))
	134
	135	(defun calendar-cursor-to-nearest-date ()
	136	"Move the cursor to the closest date.
	137	The position of the cursor is unchanged if it is already on a date.
	138	Returns the list (month day year) giving the cursor position."
	139	(let ((date (calendar-cursor-to-date))
	140	(column (current-column)))
	141	(if date
	142	date
	143	(if (> 3 (count-lines (point-min) (point)))
	144	(progn
	145	(goto-line 3)
	146	(move-to-column column)))
	147	(if (not (looking-at "[0-9]"))
	148	(if (and (not (looking-at " *$"))
	149	(or (< column 25)
	150	(and (> column 27)
	151	(< column 50))
	152	(and (> column 52)
	153	(< column 75))))
	154	(progn
	155	(re-search-forward "[0-9]" nil t)
	156	(backward-char 1))
	157	(re-search-backward "[0-9]" nil t)))
	158	(calendar-cursor-to-date))))
	159
	160	(defun calendar-forward-day (arg)
	161	"Move the cursor forward ARG days.
	162	Moves backward if ARG is negative."
	163	(interactive "p")
	164	(if (/= 0 arg)
	165	(let*
	166	((cursor-date (calendar-cursor-to-date))
	167	(cursor-date (if cursor-date
	168	cursor-date
	169	(if (> arg 0) (setq arg (1- arg)))
	170	(calendar-cursor-to-nearest-date)))
	171	(new-cursor-date
	172	(calendar-gregorian-from-absolute
	173	(+ (calendar-absolute-from-gregorian cursor-date) arg)))
	174	(new-display-month (extract-calendar-month new-cursor-date))
	175	(new-display-year (extract-calendar-year new-cursor-date)))
	176	;; Put the new month on the screen, if needed, and go to the new date.
	177	(if (not (calendar-date-is-visible-p new-cursor-date))
	178	(calendar-other-month new-display-month new-display-year))
d2e8c33b RS	179	(calendar-cursor-to-visible-date new-cursor-date)))
d2e8c33b RS	180	(run-hooks 'calendar-move-hook))
0808d911 ER	181
	182	(defun calendar-backward-day (arg)
	183	"Move the cursor back ARG days.
	184	Moves forward if ARG is negative."
	185	(interactive "p")
	186	(calendar-forward-day (- arg)))
	187
	188	(defun calendar-forward-week (arg)
	189	"Move the cursor forward ARG weeks.
	190	Moves backward if ARG is negative."
	191	(interactive "p")
	192	(calendar-forward-day (* arg 7)))
	193
	194	(defun calendar-backward-week (arg)
	195	"Move the cursor back ARG weeks.
	196	Moves forward if ARG is negative."
	197	(interactive "p")
	198	(calendar-forward-day (* arg -7)))
	199
	200	(defun calendar-beginning-of-week (arg)
	201	"Move the cursor back ARG calendar-week-start-day's."
	202	(interactive "p")
	203	(calendar-cursor-to-nearest-date)
	204	(let ((day (calendar-day-of-week (calendar-cursor-to-date))))
	205	(calendar-backward-day
	206	(if (= day calendar-week-start-day)
	207	(* 7 arg)
	208	(+ (mod (- day calendar-week-start-day) 7)
	209	(* 7 (1- arg)))))))
	210
	211	(defun calendar-end-of-week (arg)
	212	"Move the cursor forward ARG calendar-week-start-day+6's."
	213	(interactive "p")
	214	(calendar-cursor-to-nearest-date)
	215	(let ((day (calendar-day-of-week (calendar-cursor-to-date))))
	216	(calendar-forward-day
	217	(if (= day (mod (1- calendar-week-start-day) 7))
	218	(* 7 arg)
	219	(+ (- 6 (mod (- day calendar-week-start-day) 7))
	220	(* 7 (1- arg)))))))
	221
	222	(defun calendar-beginning-of-month (arg)
	223	"Move the cursor backward ARG month beginnings."
	224	(interactive "p")
	225	(calendar-cursor-to-nearest-date)
	226	(let* ((date (calendar-cursor-to-date))
	227	(month (extract-calendar-month date))
	228	(day (extract-calendar-day date))
	229	(year (extract-calendar-year date)))
	230	(if (= day 1)
	231	(calendar-backward-month arg)
	232	(calendar-cursor-to-visible-date (list month 1 year))
	233	(calendar-backward-month (1- arg)))))
	234
	235	(defun calendar-end-of-month (arg)
	236	"Move the cursor forward ARG month ends."
	237	(interactive "p")
	238	(calendar-cursor-to-nearest-date)
	239	(let* ((date (calendar-cursor-to-date))
	240	(month (extract-calendar-month date))
	241	(day (extract-calendar-day date))
	242	(year (extract-calendar-year date))
	243	(last-day (calendar-last-day-of-month month year)))
	244	(if (/= day last-day)
245	(progn
246	(calendar-cursor-to-visible-date (list month last-day year))
247	(setq arg (1- arg))))
248	(increment-calendar-month month year arg)
249	(let ((last-day (list
250	month
251	(calendar-last-day-of-month month year)
252	year)))
253	(if (not (calendar-date-is-visible-p last-day))
254	(calendar-other-month month year)
d2e8c33b RS	255	(calendar-cursor-to-visible-date last-day))))
d2e8c33b RS	256	(run-hooks 'calendar-move-hook))
0808d911 ER	257
	258	(defun calendar-beginning-of-year (arg)
	259	"Move the cursor backward ARG year beginnings."
	260	(interactive "p")
	261	(calendar-cursor-to-nearest-date)
	262	(let* ((date (calendar-cursor-to-date))
	263	(month (extract-calendar-month date))
	264	(day (extract-calendar-day date))
	265	(year (extract-calendar-year date))
d2e8c33b RS	266	(jan-first (list 1 1 year))
d2e8c33b RS	267	(calendar-move-hook nil))
0808d911 ER	268	(if (and (= day 1) (= 1 month))
	269	(calendar-backward-month (* 12 arg))
	270	(if (and (= arg 1)
	271	(calendar-date-is-visible-p jan-first))
	272	(calendar-cursor-to-visible-date jan-first)
25b11e01 GM	273	(calendar-other-month 1 (- year (1- arg)))
25b11e01 GM	274	(calendar-cursor-to-visible-date (list 1 1 displayed-year)))))
d2e8c33b	275	(run-hooks 'calendar-move-hook))
0808d911 ER	276
	277	(defun calendar-end-of-year (arg)
	278	"Move the cursor forward ARG year beginnings."
	279	(interactive "p")
	280	(calendar-cursor-to-nearest-date)
	281	(let* ((date (calendar-cursor-to-date))
	282	(month (extract-calendar-month date))
	283	(day (extract-calendar-day date))
	284	(year (extract-calendar-year date))
d2e8c33b RS	285	(dec-31 (list 12 31 year))
d2e8c33b RS	286	(calendar-move-hook nil))
0808d911 ER	287	(if (and (= day 31) (= 12 month))
	288	(calendar-forward-month (* 12 arg))
	289	(if (and (= arg 1)
	290	(calendar-date-is-visible-p dec-31))
	291	(calendar-cursor-to-visible-date dec-31)
25b11e01	292	(calendar-other-month 12 (+ year (1- arg)))
d2e8c33b RS	293	(calendar-cursor-to-visible-date (list 12 31 displayed-year)))))
d2e8c33b RS	294	(run-hooks 'calendar-move-hook))
0808d911 ER	295
	296	(defun calendar-cursor-to-visible-date (date)
	297	"Move the cursor to DATE that is on the screen."
	298	(let* ((month (extract-calendar-month date))
	299	(day (extract-calendar-day date))
	300	(year (extract-calendar-year date))
	301	(first-of-month-weekday (calendar-day-of-week (list month 1 year))))
	302	(goto-line (+ 3
	303	(/ (+ day -1
	304	(mod
	305	(- (calendar-day-of-week (list month 1 year))
	306	calendar-week-start-day)
	307	7))
	308	7)))
	309	(move-to-column (+ 6
	310	(* 25
	311	(1+ (calendar-interval
	312	displayed-month displayed-year month year)))
	313	(* 3 (mod
	314	(- (calendar-day-of-week date)
	315	calendar-week-start-day)
	316	7))))))
	317
	318	(defun calendar-goto-date (date)
	319	"Move cursor to DATE."
	320	(interactive (list (calendar-read-date)))
	321	(let ((month (extract-calendar-month date))
	322	(year (extract-calendar-year date)))
	323	(if (not (calendar-date-is-visible-p date))
	324	(calendar-other-month
	325	(if (and (= month 1) (= year 1))
	326	2
	327	month)
	328	year)))
d2e8c33b RS	329	(calendar-cursor-to-visible-date date)
d2e8c33b RS	330	(run-hooks 'calendar-move-hook))
0808d911	331
163fd24d GM	332	(defun calendar-goto-day-of-year (year day &optional noecho)
	333	"Move cursor to YEAR, DAY number; echo DAY/YEAR unless NOECHO is t.
	334	Negative DAY counts backward from end of year."
	335	(interactive
	336	(let* ((year (calendar-read
	337	"Year (>0): "
	338	(lambda (x) (> x 0))
	339	(int-to-string (extract-calendar-year
	340	(calendar-current-date)))))
	341	(last (if (calendar-leap-year-p year) 366 365))
	342	(day (calendar-read
	343	(format "Day number (+/- 1-%d): " last)
	344	'(lambda (x) (and (<= 1 (abs x)) (<= (abs x) last))))))
	345	(list year day)))
	346	(calendar-goto-date
	347	(calendar-gregorian-from-absolute
	348	(if (< 0 day)
	349	(+ -1 day (calendar-absolute-from-gregorian (list 1 1 year)))
	350	(+ 1 day (calendar-absolute-from-gregorian (list 12 31 year))))))
	351	(or noecho (calendar-print-day-of-year)))
	352
0808d911 ER	353	(provide 'cal-move)
0808d911 ER	354
ab5796a9	355	;;; arch-tag: d0883c46-7e16-4914-8ff8-8f67e699b781
0808d911	356	;;; cal-move.el ends here