aboutsummaryrefslogtreecommitdiffstats
path: root/src/calendar.c
blob: 15c511cfca12d01f702c287278667da61d9566f3 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
/*	$calcurse: calendar.c,v 1.9 2007/07/28 13:11:42 culot Exp $	*/

/*
 * Calcurse - text-based organizer
 * Copyright (c) 2004-2007 Frederic Culot
 *
 * This program 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 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA 02111-1307, USA.
 *
 * Send your feedback or comments to : calcurse@culot.org
 * Calcurse home page : http://culot.org/calcurse
 *
 */

#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <time.h>

#include "i18n.h"
#include "day.h"
#include "apoint.h"
#include "event.h"
#include "calendar.h"
#include "custom.h"
#include "vars.h"
#include "utils.h"

static date_t		today, slctd_day;
static bool		week_begins_on_monday;
static pthread_mutex_t 	date_thread_mutex = PTHREAD_MUTEX_INITIALIZER;
static pthread_t 	calendar_t_date;


/* Thread needed to update current date in calendar. */
static void *
calendar_date_thread(void *arg)
{
	time_t now, tomorrow;

	for (;;) {
		tomorrow = (time_t)(get_today() + DAYINSEC);

		while ((now = time(NULL)) < tomorrow) {
			sleep(tomorrow - now);
		}

		calendar_set_current_date();
		calendar_update_panel(cwin);
	}

	pthread_exit((void*) 0);
}

/* Launch the calendar date thread. */
void 
calendar_start_date_thread(void) 
{
	pthread_create(&calendar_t_date, NULL, calendar_date_thread, NULL);
	return;
}

/* Stop the calendar date thread. */
void 
calendar_stop_date_thread(void)
{
	pthread_cancel(calendar_t_date);
	return;
}

/* Set static variable today to current date */
void 
calendar_set_current_date(void)
{
	time_t	  timer;
	struct tm *tm;

	timer = time(NULL);
	tm = localtime(&timer);

	pthread_mutex_lock(&date_thread_mutex);
	today.dd = tm->tm_mday;
	today.mm = tm->tm_mon + 1;
	today.yyyy = tm->tm_year + 1900;
	pthread_mutex_unlock(&date_thread_mutex);
}

/* Needed to display sunday or monday as the first day of week in calendar. */
void
calendar_set_first_day_of_week(wday_t first_day)
{
	switch (first_day) {
	case SUNDAY:
		week_begins_on_monday = false;
		break;
	case MONDAY:
		week_begins_on_monday = true;
		break;
	default:
		fputs(_("ERROR in calendar_set_first_day_of_week\n"), stderr);
		week_begins_on_monday = false; 
		/* NOTREACHED */
	}
}

/* Swap first day of week in calendar. */
void
calendar_change_first_day_of_week(void)
{
	week_begins_on_monday = !week_begins_on_monday;
}

/* Return true if week begins on monday, false otherwise. */
bool
calendar_week_begins_on_monday(void)
{
	return (week_begins_on_monday);
}

/* Fill in the given variable with the current date. */
void
calendar_store_current_date(date_t *date)
{
	pthread_mutex_lock(&date_thread_mutex);
	*date = today;
	pthread_mutex_unlock(&date_thread_mutex);
}

/* This is to start at the current date in calendar. */
void
calendar_init_slctd_day(void)
{
	calendar_store_current_date(&slctd_day);
}

/* Return the selected day in calendar */
date_t *
calendar_get_slctd_day(void)
{
	return (&slctd_day);
}

/* Returned value represents the selected day in calendar (in seconds) */
long
calendar_get_slctd_day_sec(void)
{
	return (date2sec(slctd_day, 0, 0));
}

static int 
isBissextile(unsigned year)
{
	return (year % 400 == 0 || (year % 4 == 0 && year % 100 != 0));
}

static unsigned 
months_to_days(unsigned month)
{
	return ((month * 3057 - 3007) / 100);
}


static long 
years_to_days(unsigned year)
{
	return (year * 365L + year / 4 - year / 100 + year / 400);
}

static long 
ymd_to_scalar(unsigned year, unsigned month, unsigned day)
{
	long scalar;

	scalar = day + months_to_days(month);
	if (month > 2)
		scalar -= isBissextile(year) ? 1 : 2;
	year--;
	scalar += years_to_days(year);

	return (scalar);
}

/* Function used to display the calendar panel. */
void
calendar_update_panel(WINDOW *cwin)
{
	date_t current_day, check_day;
	int c_day, c_day_1, day_1_sav, numdays, j;
	unsigned yr, mo;
	int ofs_x, ofs_y;
	int item_this_day = 0;
	int title_lines = 3;
        int sunday_first = 0;

	/* inits */
	calendar_store_current_date(&current_day);
	erase_window_part(cwin, 1, title_lines, CALWIDTH - 2, CALHEIGHT - 2);
	mo = slctd_day.mm;
	yr = slctd_day.yyyy;
        if (!calendar_week_begins_on_monday()) 
		sunday_first = 1;
	
	/* offset for centering calendar in window */
	ofs_y = 2 + (CALHEIGHT - 9) / 2;
	ofs_x = (CALWIDTH - 27) / 2;

	/* checking the number of days in february */
	numdays = days[mo - 1];
	if (2 == mo && isBissextile(yr))
		++numdays;

	/*
	 * the first calendar day will be monday or sunday, depending on
         * 'week_begins_on_monday' value
	 */
	c_day_1 = 
	    (int)((ymd_to_scalar(yr, mo, 1 + sunday_first) - (long)1) % 7L);

	/* Write the current month and year on top of the calendar */
	custom_apply_attr(cwin, ATTR_HIGH);
	mvwprintw(cwin, ofs_y,
	    (CALWIDTH - (strlen(_(monthnames[mo - 1])) + 5)) / 2,
	    "%s %d", _(monthnames[mo - 1]), slctd_day.yyyy);
	custom_remove_attr(cwin, ATTR_HIGH);
	++ofs_y;

	/* print the days, with regards to the first day of the week */
	custom_apply_attr(cwin, ATTR_HIGH);
	for (j = 0; j < 7; j++) {
		mvwprintw(cwin, ofs_y, ofs_x + 4 * j, "%s", 
		    _(daynames[1 + j - sunday_first]));
	}
	custom_remove_attr(cwin, ATTR_HIGH);

	day_1_sav = (c_day_1 + 1) * 3 + c_day_1 - 7;

	for (c_day = 1; c_day <= numdays; ++c_day, ++c_day_1, c_day_1 %= 7) {
		check_day.dd = c_day;
		check_day.mm = slctd_day.mm;
		check_day.yyyy = slctd_day.yyyy;

		/* check if the day contains an event or an appointment */
		item_this_day = 
		    day_check_if_item(check_day);

		/* Go to next line, the week is over. */
		if (!c_day_1 && 1 != c_day) {	
			++ofs_y;
			ofs_x = 2 - day_1_sav - 4 * c_day - 1;
		}

		/* This is today, so print it in yellow. */
		if (c_day == current_day.dd && current_day.mm == slctd_day.mm 
    		    && current_day.yyyy == slctd_day.yyyy && 
		    current_day.dd != slctd_day.dd) {

			custom_apply_attr(cwin, ATTR_LOWEST);
			mvwprintw(cwin, ofs_y + 1,
			    ofs_x + day_1_sav + 4 * c_day + 1, "%2d", c_day);
			custom_remove_attr(cwin, ATTR_LOWEST);

		} else if (c_day == slctd_day.dd && 
		    ( (current_day.dd != slctd_day.dd) || 
		      (current_day.mm != slctd_day.mm) 
		      || (current_day.yyyy != slctd_day.yyyy))) {

			/* This is the selected day, print it in red. */
			custom_apply_attr(cwin, ATTR_MIDDLE);
			mvwprintw(cwin, ofs_y + 1,
		   	    ofs_x + day_1_sav + 4 * c_day + 1, "%2d", c_day);
			custom_remove_attr(cwin, ATTR_MIDDLE);

		} else if (c_day == slctd_day.dd && 
		    current_day.dd == slctd_day.dd && 
		    current_day.mm == slctd_day.mm && 
		    current_day.yyyy == slctd_day.yyyy) {
			
			/* today is the selected day */
			custom_apply_attr(cwin, ATTR_MIDDLE);
			mvwprintw(cwin, ofs_y + 1,
		   	    ofs_x + day_1_sav + 4 * c_day + 1, "%2d", c_day);
			custom_remove_attr(cwin, ATTR_MIDDLE);

		} else if (item_this_day) {
			custom_apply_attr(cwin, ATTR_LOW);
			mvwprintw(cwin, ofs_y + 1,
		   	    ofs_x + day_1_sav + 4 * c_day + 1, "%2d", c_day);
			custom_remove_attr(cwin, ATTR_LOW);
		} else		
			/* otherwise, print normal days in black */
			mvwprintw(cwin, ofs_y + 1,
			    ofs_x + day_1_sav + 4 * c_day + 1, "%2d", c_day);

	}
	wnoutrefresh(cwin);
}

/* 
 * Ask for a date to jump to, then check the correctness of that date
 * and jump to it.
 * If the entered date is empty, automatically jump to the current date.
 * today is the current day given to that routine, and slctd_day is updated 
 * with the newly selected date.
 */
void
calendar_change_day(void)
{
#define LDAY 11
	char selected_day[LDAY] = "";
	date_t today;
	int dday, dmonth, dyear;
	int wrong_day = 1;
	char *mesg_line1 = _("The day you entered is not valid");
	char *mesg_line2 = _("Press [ENTER] to continue");
	char *request_date = 
	    _("Enter the day to go to [ENTER for today] : mm/dd/yyyy");

	while (wrong_day) {
		status_mesg(request_date, "");
		if (getstring(swin, selected_day, LDAY, 0, 1) == GETSTRING_ESC)
			return;
		else {
			if (strlen(selected_day) == 0) {
				calendar_store_current_date(&today);

				/* go to today */
				wrong_day = 0;
				slctd_day.dd = today.dd;
				slctd_day.mm = today.mm;
				slctd_day.yyyy = today.yyyy;

			} else if (strlen(selected_day) != LDAY - 1) {

				wrong_day = 1;	

			} else {

				sscanf(selected_day, "%u/%u/%u", 
			    	    &dmonth, &dday, &dyear);
				wrong_day = 0;

				/* basic check on entered date */
				if ((dday <= 0) || (dday >= 32) || 
				    (dmonth <= 0) || (dmonth >= 13) || 
				    (dyear <= 0) || (dyear >= 3000))
					wrong_day = 1;

				/* go to chosen day */
				if (wrong_day != 1) {
					slctd_day.dd = dday;
					slctd_day.mm = dmonth;
					slctd_day.yyyy = dyear;
				} 
			}

			if (wrong_day) {
				status_mesg(mesg_line1, mesg_line2);
				wgetch(swin);
			}
		}
	}

	return;
}

/* Move to next day, next month or next year in calendar. */
void
calendar_move_right(void)
{
	if ((slctd_day.dd == 31) && (slctd_day.mm == 12)) {
		slctd_day.dd = 0;
		slctd_day.mm = 1;
		slctd_day.yyyy++; 
	} else if (slctd_day.dd == days[slctd_day.mm - 1]) { 
		slctd_day.mm++;
		slctd_day.dd = 1;
	} else
		slctd_day.dd++;
}

/* Move to previous day, previous month or previous year in calendar. */
void
calendar_move_left(void)
{
	if ((slctd_day.dd == 1) && (slctd_day.mm == 1)) { 
		slctd_day.dd = 32;
		slctd_day.mm = 12;
		slctd_day.yyyy--;
	} else if (slctd_day.dd == 1) { 
		slctd_day.dd = days[slctd_day.mm - 2];
		slctd_day.mm--;
	} else
		slctd_day.dd--;
}

/* Move to previous week, previous month or previous year in calendar. */
void
calendar_move_up(void)
{
	if ((slctd_day.dd <= 7) && (slctd_day.mm == 1)) { 
		slctd_day.dd = 31 - (7 - slctd_day.dd);
		slctd_day.mm = 12;
		slctd_day.yyyy--;
	} else if (slctd_day.dd <= 7) { 
		slctd_day.dd = days[slctd_day.mm - 2] -
		    (7 - slctd_day.dd);
		slctd_day.mm--;
	} else 
		slctd_day.dd -= 7;
}

/* Move to next week, next month or next year in calendar. */
void
calendar_move_down(void)
{
	if ((slctd_day.dd > days[slctd_day.mm - 1] - 7)
	    && (slctd_day.mm == 12)) { 
		slctd_day.dd = (7 - (31 - slctd_day.dd));
		slctd_day.mm = 1;
		slctd_day.yyyy++;
	} else if (slctd_day.dd > days[slctd_day.mm - 1] - 7) { 
		slctd_day.dd = (7 - (days[slctd_day.mm - 1] - slctd_day.dd));
		slctd_day.mm++;
	} else 
		slctd_day.dd += 7;
}