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0808d911 ER |
1 | ;;; cal-move.el --- calendar functions for movement in the calendar |
2 | ||
3 | ;; Copyright (C) 1995 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Author: Edward M. Reingold <reingold@cs.uiuc.edu> | |
6 | ;; Keywords: calendar | |
7 | ;; Human-Keywords: calendar | |
8 | ||
9 | ;; This file is part of GNU Emacs. | |
10 | ||
11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
12 | ;; it under the terms of the GNU General Public License as published by | |
13 | ;; the Free Software Foundation; either version 2, or (at your option) | |
14 | ;; any later version. | |
15 | ||
16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19 | ;; GNU General Public License for more details. | |
20 | ||
21 | ;; You should have received a copy of the GNU General Public License | |
b578f267 EN |
22 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
23 | ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
24 | ;; Boston, MA 02111-1307, USA. | |
0808d911 ER |
25 | |
26 | ;;; Commentary: | |
27 | ||
28 | ;; This collection of functions implements movement in the calendar for | |
29 | ;; calendar.el. | |
30 | ||
31 | ;; Comments, corrections, and improvements should be sent to | |
32 | ;; Edward M. Reingold Department of Computer Science | |
33 | ;; (217) 333-6733 University of Illinois at Urbana-Champaign | |
34 | ;; reingold@cs.uiuc.edu 1304 West Springfield Avenue | |
35 | ;; Urbana, Illinois 61801 | |
36 | ||
37 | ;;; Code: | |
38 | ||
0b0f8fa4 GM |
39 | (defvar displayed-month) |
40 | (defvar displayed-year) | |
41 | ||
20eff799 RS |
42 | (require 'calendar) |
43 | ||
0808d911 ER |
44 | (defun calendar-goto-today () |
45 | "Reposition the calendar window so the current date is visible." | |
46 | (interactive) | |
47 | (let ((today (calendar-current-date)));; The date might have changed. | |
48 | (if (not (calendar-date-is-visible-p today)) | |
49 | (generate-calendar-window) | |
50 | (update-calendar-mode-line) | |
d2e8c33b RS |
51 | (calendar-cursor-to-visible-date today))) |
52 | (run-hooks 'calendar-move-hook)) | |
0808d911 ER |
53 | |
54 | (defun calendar-forward-month (arg) | |
55 | "Move the cursor forward ARG months. | |
56 | Movement is backward if ARG is negative." | |
57 | (interactive "p") | |
58 | (calendar-cursor-to-nearest-date) | |
59 | (let* ((cursor-date (calendar-cursor-to-date t)) | |
60 | (month (extract-calendar-month cursor-date)) | |
61 | (day (extract-calendar-day cursor-date)) | |
62 | (year (extract-calendar-year cursor-date))) | |
63 | (increment-calendar-month month year arg) | |
64 | (let ((last (calendar-last-day-of-month month year))) | |
65 | (if (< last day) | |
66 | (setq day last))) | |
67 | ;; Put the new month on the screen, if needed, and go to the new date. | |
68 | (let ((new-cursor-date (list month day year))) | |
69 | (if (not (calendar-date-is-visible-p new-cursor-date)) | |
70 | (calendar-other-month month year)) | |
d2e8c33b RS |
71 | (calendar-cursor-to-visible-date new-cursor-date))) |
72 | (run-hooks 'calendar-move-hook)) | |
0808d911 ER |
73 | |
74 | (defun calendar-forward-year (arg) | |
75 | "Move the cursor forward by ARG years. | |
76 | Movement is backward if ARG is negative." | |
77 | (interactive "p") | |
78 | (calendar-forward-month (* 12 arg))) | |
79 | ||
80 | (defun calendar-backward-month (arg) | |
81 | "Move the cursor backward by ARG months. | |
82 | Movement is forward if ARG is negative." | |
83 | (interactive "p") | |
84 | (calendar-forward-month (- arg))) | |
85 | ||
86 | (defun calendar-backward-year (arg) | |
87 | "Move the cursor backward ARG years. | |
88 | Movement is forward is ARG is negative." | |
89 | (interactive "p") | |
90 | (calendar-forward-month (* -12 arg))) | |
91 | ||
f7b37bae | 92 | (defun scroll-calendar-left (&optional arg) |
0808d911 ER |
93 | "Scroll the displayed calendar left by ARG months. |
94 | If ARG is negative the calendar is scrolled right. Maintains the relative | |
95 | position of the cursor with respect to the calendar as well as possible." | |
96 | (interactive "p") | |
f7b37bae | 97 | (unless arg (setq arg 1)) |
0808d911 ER |
98 | (calendar-cursor-to-nearest-date) |
99 | (let ((old-date (calendar-cursor-to-date)) | |
100 | (today (calendar-current-date))) | |
101 | (if (/= arg 0) | |
9aa84f7f AS |
102 | (let ((month displayed-month) |
103 | (year displayed-year)) | |
104 | (increment-calendar-month month year arg) | |
105 | (generate-calendar-window month year) | |
0808d911 ER |
106 | (calendar-cursor-to-visible-date |
107 | (cond | |
108 | ((calendar-date-is-visible-p old-date) old-date) | |
109 | ((calendar-date-is-visible-p today) today) | |
d2e8c33b RS |
110 | (t (list month 1 year))))))) |
111 | (run-hooks 'calendar-move-hook)) | |
0808d911 | 112 | |
f7b37bae | 113 | (defun scroll-calendar-right (&optional arg) |
0808d911 ER |
114 | "Scroll the displayed calendar window right by ARG months. |
115 | If ARG is negative the calendar is scrolled left. Maintains the relative | |
116 | position of the cursor with respect to the calendar as well as possible." | |
117 | (interactive "p") | |
f7b37bae | 118 | (scroll-calendar-left (- (or arg 1)))) |
0808d911 ER |
119 | |
120 | (defun scroll-calendar-left-three-months (arg) | |
121 | "Scroll the displayed calendar window left by 3*ARG months. | |
122 | If ARG is negative the calendar is scrolled right. Maintains the relative | |
123 | position of the cursor with respect to the calendar as well as possible." | |
124 | (interactive "p") | |
125 | (scroll-calendar-left (* 3 arg))) | |
126 | ||
127 | (defun scroll-calendar-right-three-months (arg) | |
128 | "Scroll the displayed calendar window right by 3*ARG months. | |
129 | If ARG is negative the calendar is scrolled left. Maintains the relative | |
130 | position of the cursor with respect to the calendar as well as possible." | |
131 | (interactive "p") | |
132 | (scroll-calendar-left (* -3 arg))) | |
133 | ||
134 | (defun calendar-cursor-to-nearest-date () | |
135 | "Move the cursor to the closest date. | |
136 | The position of the cursor is unchanged if it is already on a date. | |
137 | Returns the list (month day year) giving the cursor position." | |
138 | (let ((date (calendar-cursor-to-date)) | |
139 | (column (current-column))) | |
140 | (if date | |
141 | date | |
142 | (if (> 3 (count-lines (point-min) (point))) | |
143 | (progn | |
144 | (goto-line 3) | |
145 | (move-to-column column))) | |
146 | (if (not (looking-at "[0-9]")) | |
147 | (if (and (not (looking-at " *$")) | |
148 | (or (< column 25) | |
149 | (and (> column 27) | |
150 | (< column 50)) | |
151 | (and (> column 52) | |
152 | (< column 75)))) | |
153 | (progn | |
154 | (re-search-forward "[0-9]" nil t) | |
155 | (backward-char 1)) | |
156 | (re-search-backward "[0-9]" nil t))) | |
157 | (calendar-cursor-to-date)))) | |
158 | ||
159 | (defun calendar-forward-day (arg) | |
160 | "Move the cursor forward ARG days. | |
161 | Moves backward if ARG is negative." | |
162 | (interactive "p") | |
163 | (if (/= 0 arg) | |
164 | (let* | |
165 | ((cursor-date (calendar-cursor-to-date)) | |
166 | (cursor-date (if cursor-date | |
167 | cursor-date | |
168 | (if (> arg 0) (setq arg (1- arg))) | |
169 | (calendar-cursor-to-nearest-date))) | |
170 | (new-cursor-date | |
171 | (calendar-gregorian-from-absolute | |
172 | (+ (calendar-absolute-from-gregorian cursor-date) arg))) | |
173 | (new-display-month (extract-calendar-month new-cursor-date)) | |
174 | (new-display-year (extract-calendar-year new-cursor-date))) | |
175 | ;; Put the new month on the screen, if needed, and go to the new date. | |
176 | (if (not (calendar-date-is-visible-p new-cursor-date)) | |
177 | (calendar-other-month new-display-month new-display-year)) | |
d2e8c33b RS |
178 | (calendar-cursor-to-visible-date new-cursor-date))) |
179 | (run-hooks 'calendar-move-hook)) | |
0808d911 ER |
180 | |
181 | (defun calendar-backward-day (arg) | |
182 | "Move the cursor back ARG days. | |
183 | Moves forward if ARG is negative." | |
184 | (interactive "p") | |
185 | (calendar-forward-day (- arg))) | |
186 | ||
187 | (defun calendar-forward-week (arg) | |
188 | "Move the cursor forward ARG weeks. | |
189 | Moves backward if ARG is negative." | |
190 | (interactive "p") | |
191 | (calendar-forward-day (* arg 7))) | |
192 | ||
193 | (defun calendar-backward-week (arg) | |
194 | "Move the cursor back ARG weeks. | |
195 | Moves forward if ARG is negative." | |
196 | (interactive "p") | |
197 | (calendar-forward-day (* arg -7))) | |
198 | ||
199 | (defun calendar-beginning-of-week (arg) | |
200 | "Move the cursor back ARG calendar-week-start-day's." | |
201 | (interactive "p") | |
202 | (calendar-cursor-to-nearest-date) | |
203 | (let ((day (calendar-day-of-week (calendar-cursor-to-date)))) | |
204 | (calendar-backward-day | |
205 | (if (= day calendar-week-start-day) | |
206 | (* 7 arg) | |
207 | (+ (mod (- day calendar-week-start-day) 7) | |
208 | (* 7 (1- arg))))))) | |
209 | ||
210 | (defun calendar-end-of-week (arg) | |
211 | "Move the cursor forward ARG calendar-week-start-day+6's." | |
212 | (interactive "p") | |
213 | (calendar-cursor-to-nearest-date) | |
214 | (let ((day (calendar-day-of-week (calendar-cursor-to-date)))) | |
215 | (calendar-forward-day | |
216 | (if (= day (mod (1- calendar-week-start-day) 7)) | |
217 | (* 7 arg) | |
218 | (+ (- 6 (mod (- day calendar-week-start-day) 7)) | |
219 | (* 7 (1- arg))))))) | |
220 | ||
221 | (defun calendar-beginning-of-month (arg) | |
222 | "Move the cursor backward ARG month beginnings." | |
223 | (interactive "p") | |
224 | (calendar-cursor-to-nearest-date) | |
225 | (let* ((date (calendar-cursor-to-date)) | |
226 | (month (extract-calendar-month date)) | |
227 | (day (extract-calendar-day date)) | |
228 | (year (extract-calendar-year date))) | |
229 | (if (= day 1) | |
230 | (calendar-backward-month arg) | |
231 | (calendar-cursor-to-visible-date (list month 1 year)) | |
232 | (calendar-backward-month (1- arg))))) | |
233 | ||
234 | (defun calendar-end-of-month (arg) | |
235 | "Move the cursor forward ARG month ends." | |
236 | (interactive "p") | |
237 | (calendar-cursor-to-nearest-date) | |
238 | (let* ((date (calendar-cursor-to-date)) | |
239 | (month (extract-calendar-month date)) | |
240 | (day (extract-calendar-day date)) | |
241 | (year (extract-calendar-year date)) | |
242 | (last-day (calendar-last-day-of-month month year))) | |
243 | (if (/= day last-day) | |
244 | (progn | |
245 | (calendar-cursor-to-visible-date (list month last-day year)) | |
246 | (setq arg (1- arg)))) | |
247 | (increment-calendar-month month year arg) | |
248 | (let ((last-day (list | |
249 | month | |
250 | (calendar-last-day-of-month month year) | |
251 | year))) | |
252 | (if (not (calendar-date-is-visible-p last-day)) | |
253 | (calendar-other-month month year) | |
d2e8c33b RS |
254 | (calendar-cursor-to-visible-date last-day)))) |
255 | (run-hooks 'calendar-move-hook)) | |
0808d911 ER |
256 | |
257 | (defun calendar-beginning-of-year (arg) | |
258 | "Move the cursor backward ARG year beginnings." | |
259 | (interactive "p") | |
260 | (calendar-cursor-to-nearest-date) | |
261 | (let* ((date (calendar-cursor-to-date)) | |
262 | (month (extract-calendar-month date)) | |
263 | (day (extract-calendar-day date)) | |
264 | (year (extract-calendar-year date)) | |
d2e8c33b RS |
265 | (jan-first (list 1 1 year)) |
266 | (calendar-move-hook nil)) | |
0808d911 ER |
267 | (if (and (= day 1) (= 1 month)) |
268 | (calendar-backward-month (* 12 arg)) | |
269 | (if (and (= arg 1) | |
270 | (calendar-date-is-visible-p jan-first)) | |
271 | (calendar-cursor-to-visible-date jan-first) | |
d2e8c33b RS |
272 | (calendar-other-month 1 (- year (1- arg)))))) |
273 | (run-hooks 'calendar-move-hook)) | |
0808d911 ER |
274 | |
275 | (defun calendar-end-of-year (arg) | |
276 | "Move the cursor forward ARG year beginnings." | |
277 | (interactive "p") | |
278 | (calendar-cursor-to-nearest-date) | |
279 | (let* ((date (calendar-cursor-to-date)) | |
280 | (month (extract-calendar-month date)) | |
281 | (day (extract-calendar-day date)) | |
282 | (year (extract-calendar-year date)) | |
d2e8c33b RS |
283 | (dec-31 (list 12 31 year)) |
284 | (calendar-move-hook nil)) | |
0808d911 ER |
285 | (if (and (= day 31) (= 12 month)) |
286 | (calendar-forward-month (* 12 arg)) | |
287 | (if (and (= arg 1) | |
288 | (calendar-date-is-visible-p dec-31)) | |
289 | (calendar-cursor-to-visible-date dec-31) | |
290 | (calendar-other-month 12 (- year (1- arg))) | |
d2e8c33b RS |
291 | (calendar-cursor-to-visible-date (list 12 31 displayed-year))))) |
292 | (run-hooks 'calendar-move-hook)) | |
0808d911 ER |
293 | |
294 | (defun calendar-cursor-to-visible-date (date) | |
295 | "Move the cursor to DATE that is on the screen." | |
296 | (let* ((month (extract-calendar-month date)) | |
297 | (day (extract-calendar-day date)) | |
298 | (year (extract-calendar-year date)) | |
299 | (first-of-month-weekday (calendar-day-of-week (list month 1 year)))) | |
300 | (goto-line (+ 3 | |
301 | (/ (+ day -1 | |
302 | (mod | |
303 | (- (calendar-day-of-week (list month 1 year)) | |
304 | calendar-week-start-day) | |
305 | 7)) | |
306 | 7))) | |
307 | (move-to-column (+ 6 | |
308 | (* 25 | |
309 | (1+ (calendar-interval | |
310 | displayed-month displayed-year month year))) | |
311 | (* 3 (mod | |
312 | (- (calendar-day-of-week date) | |
313 | calendar-week-start-day) | |
314 | 7)))))) | |
315 | ||
316 | (defun calendar-goto-date (date) | |
317 | "Move cursor to DATE." | |
318 | (interactive (list (calendar-read-date))) | |
319 | (let ((month (extract-calendar-month date)) | |
320 | (year (extract-calendar-year date))) | |
321 | (if (not (calendar-date-is-visible-p date)) | |
322 | (calendar-other-month | |
323 | (if (and (= month 1) (= year 1)) | |
324 | 2 | |
325 | month) | |
326 | year))) | |
d2e8c33b RS |
327 | (calendar-cursor-to-visible-date date) |
328 | (run-hooks 'calendar-move-hook)) | |
0808d911 | 329 | |
163fd24d GM |
330 | (defun calendar-goto-day-of-year (year day &optional noecho) |
331 | "Move cursor to YEAR, DAY number; echo DAY/YEAR unless NOECHO is t. | |
332 | Negative DAY counts backward from end of year." | |
333 | (interactive | |
334 | (let* ((year (calendar-read | |
335 | "Year (>0): " | |
336 | (lambda (x) (> x 0)) | |
337 | (int-to-string (extract-calendar-year | |
338 | (calendar-current-date))))) | |
339 | (last (if (calendar-leap-year-p year) 366 365)) | |
340 | (day (calendar-read | |
341 | (format "Day number (+/- 1-%d): " last) | |
342 | '(lambda (x) (and (<= 1 (abs x)) (<= (abs x) last)))))) | |
343 | (list year day))) | |
344 | (calendar-goto-date | |
345 | (calendar-gregorian-from-absolute | |
346 | (if (< 0 day) | |
347 | (+ -1 day (calendar-absolute-from-gregorian (list 1 1 year))) | |
348 | (+ 1 day (calendar-absolute-from-gregorian (list 12 31 year)))))) | |
349 | (or noecho (calendar-print-day-of-year))) | |
350 | ||
0808d911 ER |
351 | (provide 'cal-move) |
352 | ||
ab5796a9 | 353 | ;;; arch-tag: d0883c46-7e16-4914-8ff8-8f67e699b781 |
0808d911 | 354 | ;;; cal-move.el ends here |