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0808d911 ER |
1 | ;;; cal-move.el --- calendar functions for movement in the calendar |
2 | ||
f0fa15c5 | 3 | ;; Copyright (C) 1995, 2001, 2002, 2003, 2004, 2005, 2006, 2007 |
dbfca9c4 | 4 | ;; Free Software Foundation, Inc. |
0808d911 ER |
5 | |
6 | ;; Author: Edward M. Reingold <reingold@cs.uiuc.edu> | |
aff88519 | 7 | ;; Maintainer: Glenn Morris <rgm@gnu.org> |
0808d911 ER |
8 | ;; Keywords: calendar |
9 | ;; Human-Keywords: calendar | |
10 | ||
11 | ;; This file is part of GNU Emacs. | |
12 | ||
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 2, or (at your option) | |
16 | ;; any later version. | |
17 | ||
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. | |
22 | ||
23 | ;; You should have received a copy of the GNU General Public License | |
b578f267 | 24 | ;; along with GNU Emacs; see the file COPYING. If not, write to the |
3a35cf56 LK |
25 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
26 | ;; Boston, MA 02110-1301, USA. | |
0808d911 ER |
27 | |
28 | ;;; Commentary: | |
29 | ||
30 | ;; This collection of functions implements movement in the calendar for | |
31 | ;; calendar.el. | |
32 | ||
0808d911 ER |
33 | ;;; Code: |
34 | ||
0b0f8fa4 GM |
35 | (defvar displayed-month) |
36 | (defvar displayed-year) | |
37 | ||
20eff799 RS |
38 | (require 'calendar) |
39 | ||
0808d911 ER |
40 | (defun calendar-goto-today () |
41 | "Reposition the calendar window so the current date is visible." | |
42 | (interactive) | |
43 | (let ((today (calendar-current-date)));; The date might have changed. | |
44 | (if (not (calendar-date-is-visible-p today)) | |
45 | (generate-calendar-window) | |
46 | (update-calendar-mode-line) | |
d2e8c33b RS |
47 | (calendar-cursor-to-visible-date today))) |
48 | (run-hooks 'calendar-move-hook)) | |
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49 | |
50 | (defun calendar-forward-month (arg) | |
51 | "Move the cursor forward ARG months. | |
52 | Movement is backward if ARG is negative." | |
53 | (interactive "p") | |
54 | (calendar-cursor-to-nearest-date) | |
55 | (let* ((cursor-date (calendar-cursor-to-date t)) | |
56 | (month (extract-calendar-month cursor-date)) | |
57 | (day (extract-calendar-day cursor-date)) | |
58 | (year (extract-calendar-year cursor-date))) | |
59 | (increment-calendar-month month year arg) | |
60 | (let ((last (calendar-last-day-of-month month year))) | |
61 | (if (< last day) | |
62 | (setq day last))) | |
63 | ;; Put the new month on the screen, if needed, and go to the new date. | |
64 | (let ((new-cursor-date (list month day year))) | |
65 | (if (not (calendar-date-is-visible-p new-cursor-date)) | |
66 | (calendar-other-month month year)) | |
d2e8c33b RS |
67 | (calendar-cursor-to-visible-date new-cursor-date))) |
68 | (run-hooks 'calendar-move-hook)) | |
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69 | |
70 | (defun calendar-forward-year (arg) | |
71 | "Move the cursor forward by ARG years. | |
72 | Movement is backward if ARG is negative." | |
73 | (interactive "p") | |
74 | (calendar-forward-month (* 12 arg))) | |
75 | ||
76 | (defun calendar-backward-month (arg) | |
77 | "Move the cursor backward by ARG months. | |
78 | Movement is forward if ARG is negative." | |
79 | (interactive "p") | |
80 | (calendar-forward-month (- arg))) | |
81 | ||
82 | (defun calendar-backward-year (arg) | |
83 | "Move the cursor backward ARG years. | |
84 | Movement is forward is ARG is negative." | |
85 | (interactive "p") | |
86 | (calendar-forward-month (* -12 arg))) | |
87 | ||
f7b37bae | 88 | (defun scroll-calendar-left (&optional arg) |
0808d911 ER |
89 | "Scroll the displayed calendar left by ARG months. |
90 | If ARG is negative the calendar is scrolled right. Maintains the relative | |
91 | position of the cursor with respect to the calendar as well as possible." | |
92 | (interactive "p") | |
f7b37bae | 93 | (unless arg (setq arg 1)) |
0808d911 ER |
94 | (calendar-cursor-to-nearest-date) |
95 | (let ((old-date (calendar-cursor-to-date)) | |
96 | (today (calendar-current-date))) | |
97 | (if (/= arg 0) | |
9aa84f7f AS |
98 | (let ((month displayed-month) |
99 | (year displayed-year)) | |
100 | (increment-calendar-month month year arg) | |
101 | (generate-calendar-window month year) | |
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102 | (calendar-cursor-to-visible-date |
103 | (cond | |
104 | ((calendar-date-is-visible-p old-date) old-date) | |
105 | ((calendar-date-is-visible-p today) today) | |
d2e8c33b RS |
106 | (t (list month 1 year))))))) |
107 | (run-hooks 'calendar-move-hook)) | |
0808d911 | 108 | |
f7b37bae | 109 | (defun scroll-calendar-right (&optional arg) |
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110 | "Scroll the displayed calendar window right by ARG months. |
111 | If ARG is negative the calendar is scrolled left. Maintains the relative | |
112 | position of the cursor with respect to the calendar as well as possible." | |
113 | (interactive "p") | |
f7b37bae | 114 | (scroll-calendar-left (- (or arg 1)))) |
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115 | |
116 | (defun scroll-calendar-left-three-months (arg) | |
117 | "Scroll the displayed calendar window left by 3*ARG months. | |
118 | If ARG is negative the calendar is scrolled right. Maintains the relative | |
119 | position of the cursor with respect to the calendar as well as possible." | |
120 | (interactive "p") | |
121 | (scroll-calendar-left (* 3 arg))) | |
122 | ||
123 | (defun scroll-calendar-right-three-months (arg) | |
124 | "Scroll the displayed calendar window right by 3*ARG months. | |
125 | If ARG is negative the calendar is scrolled left. Maintains the relative | |
126 | position of the cursor with respect to the calendar as well as possible." | |
127 | (interactive "p") | |
128 | (scroll-calendar-left (* -3 arg))) | |
129 | ||
130 | (defun calendar-cursor-to-nearest-date () | |
131 | "Move the cursor to the closest date. | |
132 | The position of the cursor is unchanged if it is already on a date. | |
133 | Returns the list (month day year) giving the cursor position." | |
134 | (let ((date (calendar-cursor-to-date)) | |
135 | (column (current-column))) | |
136 | (if date | |
137 | date | |
138 | (if (> 3 (count-lines (point-min) (point))) | |
139 | (progn | |
140 | (goto-line 3) | |
141 | (move-to-column column))) | |
142 | (if (not (looking-at "[0-9]")) | |
143 | (if (and (not (looking-at " *$")) | |
144 | (or (< column 25) | |
145 | (and (> column 27) | |
146 | (< column 50)) | |
147 | (and (> column 52) | |
148 | (< column 75)))) | |
149 | (progn | |
150 | (re-search-forward "[0-9]" nil t) | |
151 | (backward-char 1)) | |
152 | (re-search-backward "[0-9]" nil t))) | |
153 | (calendar-cursor-to-date)))) | |
154 | ||
155 | (defun calendar-forward-day (arg) | |
156 | "Move the cursor forward ARG days. | |
157 | Moves backward if ARG is negative." | |
158 | (interactive "p") | |
159 | (if (/= 0 arg) | |
160 | (let* | |
161 | ((cursor-date (calendar-cursor-to-date)) | |
162 | (cursor-date (if cursor-date | |
163 | cursor-date | |
164 | (if (> arg 0) (setq arg (1- arg))) | |
165 | (calendar-cursor-to-nearest-date))) | |
166 | (new-cursor-date | |
167 | (calendar-gregorian-from-absolute | |
168 | (+ (calendar-absolute-from-gregorian cursor-date) arg))) | |
169 | (new-display-month (extract-calendar-month new-cursor-date)) | |
170 | (new-display-year (extract-calendar-year new-cursor-date))) | |
171 | ;; Put the new month on the screen, if needed, and go to the new date. | |
172 | (if (not (calendar-date-is-visible-p new-cursor-date)) | |
173 | (calendar-other-month new-display-month new-display-year)) | |
d2e8c33b RS |
174 | (calendar-cursor-to-visible-date new-cursor-date))) |
175 | (run-hooks 'calendar-move-hook)) | |
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176 | |
177 | (defun calendar-backward-day (arg) | |
178 | "Move the cursor back ARG days. | |
179 | Moves forward if ARG is negative." | |
180 | (interactive "p") | |
181 | (calendar-forward-day (- arg))) | |
182 | ||
183 | (defun calendar-forward-week (arg) | |
184 | "Move the cursor forward ARG weeks. | |
185 | Moves backward if ARG is negative." | |
186 | (interactive "p") | |
187 | (calendar-forward-day (* arg 7))) | |
188 | ||
189 | (defun calendar-backward-week (arg) | |
190 | "Move the cursor back ARG weeks. | |
191 | Moves forward if ARG is negative." | |
192 | (interactive "p") | |
193 | (calendar-forward-day (* arg -7))) | |
194 | ||
195 | (defun calendar-beginning-of-week (arg) | |
196 | "Move the cursor back ARG calendar-week-start-day's." | |
197 | (interactive "p") | |
198 | (calendar-cursor-to-nearest-date) | |
199 | (let ((day (calendar-day-of-week (calendar-cursor-to-date)))) | |
200 | (calendar-backward-day | |
201 | (if (= day calendar-week-start-day) | |
202 | (* 7 arg) | |
203 | (+ (mod (- day calendar-week-start-day) 7) | |
204 | (* 7 (1- arg))))))) | |
205 | ||
206 | (defun calendar-end-of-week (arg) | |
207 | "Move the cursor forward ARG calendar-week-start-day+6's." | |
208 | (interactive "p") | |
209 | (calendar-cursor-to-nearest-date) | |
210 | (let ((day (calendar-day-of-week (calendar-cursor-to-date)))) | |
211 | (calendar-forward-day | |
212 | (if (= day (mod (1- calendar-week-start-day) 7)) | |
213 | (* 7 arg) | |
214 | (+ (- 6 (mod (- day calendar-week-start-day) 7)) | |
215 | (* 7 (1- arg))))))) | |
216 | ||
217 | (defun calendar-beginning-of-month (arg) | |
218 | "Move the cursor backward ARG month beginnings." | |
219 | (interactive "p") | |
220 | (calendar-cursor-to-nearest-date) | |
221 | (let* ((date (calendar-cursor-to-date)) | |
222 | (month (extract-calendar-month date)) | |
223 | (day (extract-calendar-day date)) | |
224 | (year (extract-calendar-year date))) | |
225 | (if (= day 1) | |
226 | (calendar-backward-month arg) | |
227 | (calendar-cursor-to-visible-date (list month 1 year)) | |
228 | (calendar-backward-month (1- arg))))) | |
229 | ||
230 | (defun calendar-end-of-month (arg) | |
231 | "Move the cursor forward ARG month ends." | |
232 | (interactive "p") | |
233 | (calendar-cursor-to-nearest-date) | |
234 | (let* ((date (calendar-cursor-to-date)) | |
235 | (month (extract-calendar-month date)) | |
236 | (day (extract-calendar-day date)) | |
237 | (year (extract-calendar-year date)) | |
238 | (last-day (calendar-last-day-of-month month year))) | |
239 | (if (/= day last-day) | |
240 | (progn | |
241 | (calendar-cursor-to-visible-date (list month last-day year)) | |
242 | (setq arg (1- arg)))) | |
243 | (increment-calendar-month month year arg) | |
244 | (let ((last-day (list | |
245 | month | |
246 | (calendar-last-day-of-month month year) | |
247 | year))) | |
248 | (if (not (calendar-date-is-visible-p last-day)) | |
249 | (calendar-other-month month year) | |
d2e8c33b RS |
250 | (calendar-cursor-to-visible-date last-day)))) |
251 | (run-hooks 'calendar-move-hook)) | |
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252 | |
253 | (defun calendar-beginning-of-year (arg) | |
254 | "Move the cursor backward ARG year beginnings." | |
255 | (interactive "p") | |
256 | (calendar-cursor-to-nearest-date) | |
257 | (let* ((date (calendar-cursor-to-date)) | |
258 | (month (extract-calendar-month date)) | |
259 | (day (extract-calendar-day date)) | |
260 | (year (extract-calendar-year date)) | |
d2e8c33b RS |
261 | (jan-first (list 1 1 year)) |
262 | (calendar-move-hook nil)) | |
0808d911 ER |
263 | (if (and (= day 1) (= 1 month)) |
264 | (calendar-backward-month (* 12 arg)) | |
265 | (if (and (= arg 1) | |
266 | (calendar-date-is-visible-p jan-first)) | |
267 | (calendar-cursor-to-visible-date jan-first) | |
25b11e01 GM |
268 | (calendar-other-month 1 (- year (1- arg))) |
269 | (calendar-cursor-to-visible-date (list 1 1 displayed-year))))) | |
d2e8c33b | 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)) | |
0808d911 ER |
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) | |
25b11e01 | 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)) | |
0808d911 ER |
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)) | |
0808d911 | 326 | |
163fd24d GM |
327 | (defun calendar-goto-day-of-year (year day &optional noecho) |
328 | "Move cursor to YEAR, DAY number; echo DAY/YEAR unless NOECHO is t. | |
329 | Negative DAY counts backward from end of year." | |
330 | (interactive | |
331 | (let* ((year (calendar-read | |
332 | "Year (>0): " | |
333 | (lambda (x) (> x 0)) | |
334 | (int-to-string (extract-calendar-year | |
335 | (calendar-current-date))))) | |
336 | (last (if (calendar-leap-year-p year) 366 365)) | |
337 | (day (calendar-read | |
338 | (format "Day number (+/- 1-%d): " last) | |
339 | '(lambda (x) (and (<= 1 (abs x)) (<= (abs x) last)))))) | |
340 | (list year day))) | |
341 | (calendar-goto-date | |
342 | (calendar-gregorian-from-absolute | |
343 | (if (< 0 day) | |
344 | (+ -1 day (calendar-absolute-from-gregorian (list 1 1 year))) | |
345 | (+ 1 day (calendar-absolute-from-gregorian (list 12 31 year)))))) | |
346 | (or noecho (calendar-print-day-of-year))) | |
347 | ||
0808d911 ER |
348 | (provide 'cal-move) |
349 | ||
ab5796a9 | 350 | ;;; arch-tag: d0883c46-7e16-4914-8ff8-8f67e699b781 |
0808d911 | 351 | ;;; cal-move.el ends here |