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Instead of representing colours in several different forms with various
cell flags, convert to use an int with flags marking 256 or RGB colours
in the top byte (except in cells, which we don't want to make any
bigger). From Brad Town.

/* $OpenBSD: window-clock.c,v 1.18 2016/07/15 00:42:56 nicm Exp $ */

/*
 * Copyright (c) 2009 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>

#include <stdlib.h>
#include <string.h>
#include <time.h>

#include "tmux.h"

struct screen *window_clock_init(struct window_pane *);
void	window_clock_free(struct window_pane *);
void	window_clock_resize(struct window_pane *, u_int, u_int);
void	window_clock_key(struct window_pane *, struct client *,
	    struct session *, key_code, struct mouse_event *);

void	window_clock_timer_callback(int, short, void *);
void	window_clock_draw_screen(struct window_pane *);

const struct window_mode window_clock_mode = {
	window_clock_init,
	window_clock_free,
	window_clock_resize,
	window_clock_key,
};

struct window_clock_mode_data {
	struct screen	        screen;
	time_t			tim;
	struct event		timer;
};

const char window_clock_table[14][5][5] = {
	{ { 1,1,1,1,1 }, /* 0 */
	  { 1,0,0,0,1 },
	  { 1,0,0,0,1 },
	  { 1,0,0,0,1 },
	  { 1,1,1,1,1 } },
	{ { 0,0,0,0,1 }, /* 1 */
	  { 0,0,0,0,1 },
	  { 0,0,0,0,1 },
	  { 0,0,0,0,1 },
	  { 0,0,0,0,1 } },
	{ { 1,1,1,1,1 }, /* 2 */
	  { 0,0,0,0,1 },
	  { 1,1,1,1,1 },
	  { 1,0,0,0,0 },
	  { 1,1,1,1,1 } },
	{ { 1,1,1,1,1 }, /* 3 */
	  { 0,0,0,0,1 },
	  { 1,1,1,1,1 },
	  { 0,0,0,0,1 },
	  { 1,1,1,1,1 } },
	{ { 1,0,0,0,1 }, /* 4 */
	  { 1,0,0,0,1 },
	  { 1,1,1,1,1 },
	  { 0,0,0,0,1 },
	  { 0,0,0,0,1 } },
	{ { 1,1,1,1,1 }, /* 5 */
	  { 1,0,0,0,0 },
	  { 1,1,1,1,1 },
	  { 0,0,0,0,1 },
	  { 1,1,1,1,1 } },
	{ { 1,1,1,1,1 }, /* 6 */
	  { 1,0,0,0,0 },
	  { 1,1,1,1,1 },
	  { 1,0,0,0,1 },
	  { 1,1,1,1,1 } },
	{ { 1,1,1,1,1 }, /* 7 */
	  { 0,0,0,0,1 },
	  { 0,0,0,0,1 },
	  { 0,0,0,0,1 },
	  { 0,0,0,0,1 } },
	{ { 1,1,1,1,1 }, /* 8 */
	  { 1,0,0,0,1 },
	  { 1,1,1,1,1 },
	  { 1,0,0,0,1 },
	  { 1,1,1,1,1 } },
	{ { 1,1,1,1,1 }, /* 9 */
	  { 1,0,0,0,1 },
	  { 1,1,1,1,1 },
	  { 0,0,0,0,1 },
	  { 1,1,1,1,1 } },
	{ { 0,0,0,0,0 }, /* : */
	  { 0,0,1,0,0 },
	  { 0,0,0,0,0 },
	  { 0,0,1,0,0 },
	  { 0,0,0,0,0 } },
	{ { 1,1,1,1,1 }, /* A */
	  { 1,0,0,0,1 },
	  { 1,1,1,1,1 },
	  { 1,0,0,0,1 },
	  { 1,0,0,0,1 } },
	{ { 1,1,1,1,1 }, /* P */
	  { 1,0,0,0,1 },
	  { 1,1,1,1,1 },
	  { 1,0,0,0,0 },
	  { 1,0,0,0,0 } },
	{ { 1,0,0,0,1 }, /* M */
	  { 1,1,0,1,1 },
	  { 1,0,1,0,1 },
	  { 1,0,0,0,1 },
	  { 1,0,0,0,1 } },
};

void
window_clock_timer_callback(__unused int fd, __unused short events, void *arg)
{
	struct window_pane		*wp = arg;
	struct window_clock_mode_data	*data = wp->modedata;
	struct tm			 now, then;
	time_t				 t;
	struct timeval			 tv = { .tv_sec = 1 };

	evtimer_del(&data->timer);
	evtimer_add(&data->timer, &tv);

	t = time(NULL);
	gmtime_r(&t, &now);
	gmtime_r(&data->tim, &then);
	if (now.tm_min == then.tm_min)
		return;
	data->tim = t;

	window_clock_draw_screen(wp);
	server_redraw_window(wp->window);
}

struct screen *
window_clock_init(struct window_pane *wp)
{
	struct window_clock_mode_data	*data;
	struct screen			*s;
	struct timeval			 tv = { .tv_sec = 1 };

	wp->modedata = data = xmalloc(sizeof *data);
	data->tim = time(NULL);

	evtimer_set(&data->timer, window_clock_timer_callback, wp);
	evtimer_add(&data->timer, &tv);

	s = &data->screen;
	screen_init(s, screen_size_x(&wp->base), screen_size_y(&wp->base), 0);
	s->mode &= ~MODE_CURSOR;

	window_clock_draw_screen(wp);

	return (s);
}

void
window_clock_free(struct window_pane *wp)
{
	struct window_clock_mode_data	*data = wp->modedata;

	evtimer_del(&data->timer);
	screen_free(&data->screen);
	free(data);
}

void
window_clock_resize(struct window_pane *wp, u_int sx, u_int sy)
{
	struct window_clock_mode_data	*data = wp->modedata;
	struct screen			*s = &data->screen;

	screen_resize(s, sx, sy, 0);
	window_clock_draw_screen(wp);
}

void
window_clock_key(struct window_pane *wp, __unused struct client *c,
    __unused struct session *sess, __unused key_code key,
    __unused struct mouse_event *m)
{
	window_pane_reset_mode(wp);
}

void
window_clock_draw_screen(struct window_pane *wp)
{
	struct window_clock_mode_data	*data = wp->modedata;
	struct screen_write_ctx	 	 ctx;
	int				 colour, style;
	struct screen			*s = &data->screen;
	struct grid_cell		 gc;
	char				 tim[64], *ptr;
	time_t				 t;
	struct tm			*tm;
	u_int				 i, j, x, y, idx;

	colour = options_get_number(wp->window->options, "clock-mode-colour");
	style = options_get_number(wp->window->options, "clock-mode-style");

	screen_write_start(&ctx, NULL, s);

	t = time(NULL);
	tm = localtime(&t);
	if (style == 0) {
		strftime(tim, sizeof tim, "%l:%M ", localtime(&t));
		if (tm->tm_hour >= 12)
			strlcat(tim, "PM", sizeof tim);
		else
			strlcat(tim, "AM", sizeof tim);
	} else
		strftime(tim, sizeof tim, "%H:%M", tm);

	screen_write_clearscreen(&ctx);

	if (screen_size_x(s) < 6 * strlen(tim) || screen_size_y(s) < 6) {
		if (screen_size_x(s) >= strlen(tim) && screen_size_y(s) != 0) {
			x = (screen_size_x(s) / 2) - (strlen(tim) / 2);
			y = screen_size_y(s) / 2;
			screen_write_cursormove(&ctx, x, y);

			memcpy(&gc, &grid_default_cell, sizeof gc);
			gc.fg = colour;
			screen_write_puts(&ctx, &gc, "%s", tim);
		}

		screen_write_stop(&ctx);
		return;
	}

	x = (screen_size_x(s) / 2) - 3 * strlen(tim);
	y = (screen_size_y(s) / 2) - 3;

	memcpy(&gc, &grid_default_cell, sizeof gc);
	gc.bg = colour;
	for (ptr = tim; *ptr != '\0'; ptr++) {
		if (*ptr >= '0' && *ptr <= '9')
			idx = *ptr - '0';
		else if (*ptr == ':')
			idx = 10;
		else if (*ptr == 'A')
			idx = 11;
		else if (*ptr == 'P')
			idx = 12;
		else if (*ptr == 'M')
			idx = 13;
		else {
			x += 6;
			continue;
		}

		for (j = 0; j < 5; j++) {
			for (i = 0; i < 5; i++) {
				screen_write_cursormove(&ctx, x + i, y + j);
				if (window_clock_table[idx][j][i])
					screen_write_putc(&ctx, &gc, ' ');
			}
		}
		x += 6;
	}

	screen_write_stop(&ctx);
}