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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 | ||
20eff799 RS |
39 | (require 'calendar) |
40 | ||
0808d911 ER |
41 | (defun calendar-goto-today () |
42 | "Reposition the calendar window so the current date is visible." | |
43 | (interactive) | |
44 | (let ((today (calendar-current-date)));; The date might have changed. | |
45 | (if (not (calendar-date-is-visible-p today)) | |
46 | (generate-calendar-window) | |
47 | (update-calendar-mode-line) | |
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48 | (calendar-cursor-to-visible-date today))) |
49 | (run-hooks 'calendar-move-hook)) | |
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50 | |
51 | (defun calendar-forward-month (arg) | |
52 | "Move the cursor forward ARG months. | |
53 | Movement is backward if ARG is negative." | |
54 | (interactive "p") | |
55 | (calendar-cursor-to-nearest-date) | |
56 | (let* ((cursor-date (calendar-cursor-to-date t)) | |
57 | (month (extract-calendar-month cursor-date)) | |
58 | (day (extract-calendar-day cursor-date)) | |
59 | (year (extract-calendar-year cursor-date))) | |
60 | (increment-calendar-month month year arg) | |
61 | (let ((last (calendar-last-day-of-month month year))) | |
62 | (if (< last day) | |
63 | (setq day last))) | |
64 | ;; Put the new month on the screen, if needed, and go to the new date. | |
65 | (let ((new-cursor-date (list month day year))) | |
66 | (if (not (calendar-date-is-visible-p new-cursor-date)) | |
67 | (calendar-other-month month year)) | |
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68 | (calendar-cursor-to-visible-date new-cursor-date))) |
69 | (run-hooks 'calendar-move-hook)) | |
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70 | |
71 | (defun calendar-forward-year (arg) | |
72 | "Move the cursor forward by ARG years. | |
73 | Movement is backward if ARG is negative." | |
74 | (interactive "p") | |
75 | (calendar-forward-month (* 12 arg))) | |
76 | ||
77 | (defun calendar-backward-month (arg) | |
78 | "Move the cursor backward by ARG months. | |
79 | Movement is forward if ARG is negative." | |
80 | (interactive "p") | |
81 | (calendar-forward-month (- arg))) | |
82 | ||
83 | (defun calendar-backward-year (arg) | |
84 | "Move the cursor backward ARG years. | |
85 | Movement is forward is ARG is negative." | |
86 | (interactive "p") | |
87 | (calendar-forward-month (* -12 arg))) | |
88 | ||
f7b37bae | 89 | (defun scroll-calendar-left (&optional arg) |
0808d911 ER |
90 | "Scroll the displayed calendar left by ARG months. |
91 | If ARG is negative the calendar is scrolled right. Maintains the relative | |
92 | position of the cursor with respect to the calendar as well as possible." | |
93 | (interactive "p") | |
f7b37bae | 94 | (unless arg (setq arg 1)) |
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95 | (calendar-cursor-to-nearest-date) |
96 | (let ((old-date (calendar-cursor-to-date)) | |
97 | (today (calendar-current-date))) | |
98 | (if (/= arg 0) | |
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99 | (let ((month displayed-month) |
100 | (year displayed-year)) | |
101 | (increment-calendar-month month year arg) | |
102 | (generate-calendar-window month year) | |
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103 | (calendar-cursor-to-visible-date |
104 | (cond | |
105 | ((calendar-date-is-visible-p old-date) old-date) | |
106 | ((calendar-date-is-visible-p today) today) | |
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107 | (t (list month 1 year))))))) |
108 | (run-hooks 'calendar-move-hook)) | |
0808d911 | 109 | |
f7b37bae | 110 | (defun scroll-calendar-right (&optional arg) |
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111 | "Scroll the displayed calendar window right by ARG months. |
112 | If ARG is negative the calendar is scrolled left. Maintains the relative | |
113 | position of the cursor with respect to the calendar as well as possible." | |
114 | (interactive "p") | |
f7b37bae | 115 | (scroll-calendar-left (- (or arg 1)))) |
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116 | |
117 | (defun scroll-calendar-left-three-months (arg) | |
118 | "Scroll the displayed calendar window left by 3*ARG months. | |
119 | If ARG is negative the calendar is scrolled right. Maintains the relative | |
120 | position of the cursor with respect to the calendar as well as possible." | |
121 | (interactive "p") | |
122 | (scroll-calendar-left (* 3 arg))) | |
123 | ||
124 | (defun scroll-calendar-right-three-months (arg) | |
125 | "Scroll the displayed calendar window right by 3*ARG months. | |
126 | If ARG is negative the calendar is scrolled left. Maintains the relative | |
127 | position of the cursor with respect to the calendar as well as possible." | |
128 | (interactive "p") | |
129 | (scroll-calendar-left (* -3 arg))) | |
130 | ||
131 | (defun calendar-cursor-to-nearest-date () | |
132 | "Move the cursor to the closest date. | |
133 | The position of the cursor is unchanged if it is already on a date. | |
134 | Returns the list (month day year) giving the cursor position." | |
135 | (let ((date (calendar-cursor-to-date)) | |
136 | (column (current-column))) | |
137 | (if date | |
138 | date | |
139 | (if (> 3 (count-lines (point-min) (point))) | |
140 | (progn | |
141 | (goto-line 3) | |
142 | (move-to-column column))) | |
143 | (if (not (looking-at "[0-9]")) | |
144 | (if (and (not (looking-at " *$")) | |
145 | (or (< column 25) | |
146 | (and (> column 27) | |
147 | (< column 50)) | |
148 | (and (> column 52) | |
149 | (< column 75)))) | |
150 | (progn | |
151 | (re-search-forward "[0-9]" nil t) | |
152 | (backward-char 1)) | |
153 | (re-search-backward "[0-9]" nil t))) | |
154 | (calendar-cursor-to-date)))) | |
155 | ||
156 | (defun calendar-forward-day (arg) | |
157 | "Move the cursor forward ARG days. | |
158 | Moves backward if ARG is negative." | |
159 | (interactive "p") | |
160 | (if (/= 0 arg) | |
161 | (let* | |
162 | ((cursor-date (calendar-cursor-to-date)) | |
163 | (cursor-date (if cursor-date | |
164 | cursor-date | |
165 | (if (> arg 0) (setq arg (1- arg))) | |
166 | (calendar-cursor-to-nearest-date))) | |
167 | (new-cursor-date | |
168 | (calendar-gregorian-from-absolute | |
169 | (+ (calendar-absolute-from-gregorian cursor-date) arg))) | |
170 | (new-display-month (extract-calendar-month new-cursor-date)) | |
171 | (new-display-year (extract-calendar-year new-cursor-date))) | |
172 | ;; Put the new month on the screen, if needed, and go to the new date. | |
173 | (if (not (calendar-date-is-visible-p new-cursor-date)) | |
174 | (calendar-other-month new-display-month new-display-year)) | |
d2e8c33b RS |
175 | (calendar-cursor-to-visible-date new-cursor-date))) |
176 | (run-hooks 'calendar-move-hook)) | |
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177 | |
178 | (defun calendar-backward-day (arg) | |
179 | "Move the cursor back ARG days. | |
180 | Moves forward if ARG is negative." | |
181 | (interactive "p") | |
182 | (calendar-forward-day (- arg))) | |
183 | ||
184 | (defun calendar-forward-week (arg) | |
185 | "Move the cursor forward ARG weeks. | |
186 | Moves backward if ARG is negative." | |
187 | (interactive "p") | |
188 | (calendar-forward-day (* arg 7))) | |
189 | ||
190 | (defun calendar-backward-week (arg) | |
191 | "Move the cursor back ARG weeks. | |
192 | Moves forward if ARG is negative." | |
193 | (interactive "p") | |
194 | (calendar-forward-day (* arg -7))) | |
195 | ||
196 | (defun calendar-beginning-of-week (arg) | |
197 | "Move the cursor back ARG calendar-week-start-day's." | |
198 | (interactive "p") | |
199 | (calendar-cursor-to-nearest-date) | |
200 | (let ((day (calendar-day-of-week (calendar-cursor-to-date)))) | |
201 | (calendar-backward-day | |
202 | (if (= day calendar-week-start-day) | |
203 | (* 7 arg) | |
204 | (+ (mod (- day calendar-week-start-day) 7) | |
205 | (* 7 (1- arg))))))) | |
206 | ||
207 | (defun calendar-end-of-week (arg) | |
208 | "Move the cursor forward ARG calendar-week-start-day+6's." | |
209 | (interactive "p") | |
210 | (calendar-cursor-to-nearest-date) | |
211 | (let ((day (calendar-day-of-week (calendar-cursor-to-date)))) | |
212 | (calendar-forward-day | |
213 | (if (= day (mod (1- calendar-week-start-day) 7)) | |
214 | (* 7 arg) | |
215 | (+ (- 6 (mod (- day calendar-week-start-day) 7)) | |
216 | (* 7 (1- arg))))))) | |
217 | ||
218 | (defun calendar-beginning-of-month (arg) | |
219 | "Move the cursor backward ARG month beginnings." | |
220 | (interactive "p") | |
221 | (calendar-cursor-to-nearest-date) | |
222 | (let* ((date (calendar-cursor-to-date)) | |
223 | (month (extract-calendar-month date)) | |
224 | (day (extract-calendar-day date)) | |
225 | (year (extract-calendar-year date))) | |
226 | (if (= day 1) | |
227 | (calendar-backward-month arg) | |
228 | (calendar-cursor-to-visible-date (list month 1 year)) | |
229 | (calendar-backward-month (1- arg))))) | |
230 | ||
231 | (defun calendar-end-of-month (arg) | |
232 | "Move the cursor forward ARG month ends." | |
233 | (interactive "p") | |
234 | (calendar-cursor-to-nearest-date) | |
235 | (let* ((date (calendar-cursor-to-date)) | |
236 | (month (extract-calendar-month date)) | |
237 | (day (extract-calendar-day date)) | |
238 | (year (extract-calendar-year date)) | |
239 | (last-day (calendar-last-day-of-month month year))) | |
240 | (if (/= day last-day) | |
241 | (progn | |
242 | (calendar-cursor-to-visible-date (list month last-day year)) | |
243 | (setq arg (1- arg)))) | |
244 | (increment-calendar-month month year arg) | |
245 | (let ((last-day (list | |
246 | month | |
247 | (calendar-last-day-of-month month year) | |
248 | year))) | |
249 | (if (not (calendar-date-is-visible-p last-day)) | |
250 | (calendar-other-month month year) | |
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251 | (calendar-cursor-to-visible-date last-day)))) |
252 | (run-hooks 'calendar-move-hook)) | |
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253 | |
254 | (defun calendar-beginning-of-year (arg) | |
255 | "Move the cursor backward ARG year beginnings." | |
256 | (interactive "p") | |
257 | (calendar-cursor-to-nearest-date) | |
258 | (let* ((date (calendar-cursor-to-date)) | |
259 | (month (extract-calendar-month date)) | |
260 | (day (extract-calendar-day date)) | |
261 | (year (extract-calendar-year date)) | |
d2e8c33b RS |
262 | (jan-first (list 1 1 year)) |
263 | (calendar-move-hook nil)) | |
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264 | (if (and (= day 1) (= 1 month)) |
265 | (calendar-backward-month (* 12 arg)) | |
266 | (if (and (= arg 1) | |
267 | (calendar-date-is-visible-p jan-first)) | |
268 | (calendar-cursor-to-visible-date jan-first) | |
d2e8c33b RS |
269 | (calendar-other-month 1 (- year (1- arg)))))) |
270 | (run-hooks 'calendar-move-hook)) | |
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271 | |
272 | (defun calendar-end-of-year (arg) | |
273 | "Move the cursor forward ARG year beginnings." | |
274 | (interactive "p") | |
275 | (calendar-cursor-to-nearest-date) | |
276 | (let* ((date (calendar-cursor-to-date)) | |
277 | (month (extract-calendar-month date)) | |
278 | (day (extract-calendar-day date)) | |
279 | (year (extract-calendar-year date)) | |
d2e8c33b RS |
280 | (dec-31 (list 12 31 year)) |
281 | (calendar-move-hook nil)) | |
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282 | (if (and (= day 31) (= 12 month)) |
283 | (calendar-forward-month (* 12 arg)) | |
284 | (if (and (= arg 1) | |
285 | (calendar-date-is-visible-p dec-31)) | |
286 | (calendar-cursor-to-visible-date dec-31) | |
287 | (calendar-other-month 12 (- year (1- arg))) | |
d2e8c33b RS |
288 | (calendar-cursor-to-visible-date (list 12 31 displayed-year))))) |
289 | (run-hooks 'calendar-move-hook)) | |
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290 | |
291 | (defun calendar-cursor-to-visible-date (date) | |
292 | "Move the cursor to DATE that is on the screen." | |
293 | (let* ((month (extract-calendar-month date)) | |
294 | (day (extract-calendar-day date)) | |
295 | (year (extract-calendar-year date)) | |
296 | (first-of-month-weekday (calendar-day-of-week (list month 1 year)))) | |
297 | (goto-line (+ 3 | |
298 | (/ (+ day -1 | |
299 | (mod | |
300 | (- (calendar-day-of-week (list month 1 year)) | |
301 | calendar-week-start-day) | |
302 | 7)) | |
303 | 7))) | |
304 | (move-to-column (+ 6 | |
305 | (* 25 | |
306 | (1+ (calendar-interval | |
307 | displayed-month displayed-year month year))) | |
308 | (* 3 (mod | |
309 | (- (calendar-day-of-week date) | |
310 | calendar-week-start-day) | |
311 | 7)))))) | |
312 | ||
313 | (defun calendar-goto-date (date) | |
314 | "Move cursor to DATE." | |
315 | (interactive (list (calendar-read-date))) | |
316 | (let ((month (extract-calendar-month date)) | |
317 | (year (extract-calendar-year date))) | |
318 | (if (not (calendar-date-is-visible-p date)) | |
319 | (calendar-other-month | |
320 | (if (and (= month 1) (= year 1)) | |
321 | 2 | |
322 | month) | |
323 | year))) | |
d2e8c33b RS |
324 | (calendar-cursor-to-visible-date date) |
325 | (run-hooks 'calendar-move-hook)) | |
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326 | |
327 | (provide 'cal-move) | |
328 | ||
329 | ;;; cal-move.el ends here |