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Fix BELL_NONE which had been broken in some code reorganisation or other
also don't redraw unnecessarily. From Seiji Ohashi.

/* $OpenBSD: server-window.c,v 1.27 2012/10/25 11:16:53 nicm Exp $ */

/*
 * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * 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 <event.h>
#include <stdlib.h>
#include <unistd.h>

#include "tmux.h"

int	server_window_check_bell(struct session *, struct winlink *);
int	server_window_check_activity(struct session *, struct winlink *);
int	server_window_check_silence(struct session *, struct winlink *);
int	server_window_check_content(
	    struct session *, struct winlink *, struct window_pane *);
void	ring_bell(struct session *);

/* Window functions that need to happen every loop. */
void
server_window_loop(void)
{
	struct window		*w;
	struct winlink		*wl;
	struct window_pane	*wp;
	struct session		*s;
	u_int		 	 i;

	for (i = 0; i < ARRAY_LENGTH(&windows); i++) {
		w = ARRAY_ITEM(&windows, i);
		if (w == NULL)
			continue;

		RB_FOREACH(s, sessions, &sessions) {
			wl = session_has(s, w);
			if (wl == NULL)
				continue;

			if (server_window_check_bell(s, wl) ||
			    server_window_check_activity(s, wl) ||
			    server_window_check_silence(s, wl))
				server_status_session(s);
			TAILQ_FOREACH(wp, &w->panes, entry)
				server_window_check_content(s, wl, wp);
		}
	}
}

/* Check for bell in window. */
int
server_window_check_bell(struct session *s, struct winlink *wl)
{
	struct client	*c;
	struct window	*w = wl->window;
	u_int		 i;
	int		 action, visual;

	if (!(w->flags & WINDOW_BELL) || wl->flags & WINLINK_BELL)
		return (0);
	if (s->curw != wl || s->flags & SESSION_UNATTACHED)
		wl->flags |= WINLINK_BELL;
	if (s->flags & SESSION_UNATTACHED)
		return (0);
	if (s->curw->window == wl->window)
		w->flags &= ~WINDOW_BELL;

	visual = options_get_number(&s->options, "visual-bell");
	action = options_get_number(&s->options, "bell-action");
	if (action == BELL_NONE)
		return (0);
	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c == NULL || c->session != s)
			continue;
		if (!visual) {
			tty_bell(&c->tty);
			continue;
		}
		if (c->session->curw->window == w)
			status_message_set(c, "Bell in current window");
		else if (action == BELL_ANY) {
			status_message_set(c, "Bell in window %u",
				winlink_find_by_window(&s->windows, w)->idx);
		}
	}

	return (1);
}

/* Check for activity in window. */
int
server_window_check_activity(struct session *s, struct winlink *wl)
{
	struct client	*c;
	struct window	*w = wl->window;
	u_int		 i;

	if (s->curw->window == wl->window)
		w->flags &= ~WINDOW_ACTIVITY;

	if (!(w->flags & WINDOW_ACTIVITY) || wl->flags & WINLINK_ACTIVITY)
		return (0);
	if (s->curw == wl && !(s->flags & SESSION_UNATTACHED))
		return (0);

	if (!options_get_number(&w->options, "monitor-activity"))
		return (0);

	if (options_get_number(&s->options, "bell-on-alert"))
		ring_bell(s);
	wl->flags |= WINLINK_ACTIVITY;

	if (options_get_number(&s->options, "visual-activity")) {
		for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
			c = ARRAY_ITEM(&clients, i);
			if (c == NULL || c->session != s)
				continue;
			status_message_set(c, "Activity in window %u",
			    winlink_find_by_window(&s->windows, w)->idx);
		}
	}

	return (1);
}

/* Check for silence in window. */
int
server_window_check_silence(struct session *s, struct winlink *wl)
{
	struct client	*c;
	struct window	*w = wl->window;
	struct timeval	 timer;
	u_int		 i;
	int		 silence_interval, timer_difference;

	if (!(w->flags & WINDOW_SILENCE) || wl->flags & WINLINK_SILENCE)
		return (0);

	if (s->curw == wl && !(s->flags & SESSION_UNATTACHED)) {
		/*
		 * Reset the timer for this window if we've focused it.  We
		 * don't want the timer tripping as soon as we've switched away
		 * from this window.
		 */
		if (gettimeofday(&w->silence_timer, NULL) != 0)
			fatal("gettimeofday failed.");

		return (0);
	}

	silence_interval = options_get_number(&w->options, "monitor-silence");
	if (silence_interval == 0)
		return (0);

	if (gettimeofday(&timer, NULL) != 0)
		fatal("gettimeofday");
	timer_difference = timer.tv_sec - w->silence_timer.tv_sec;
	if (timer_difference <= silence_interval)
		return (0);

	if (options_get_number(&s->options, "bell-on-alert"))
		ring_bell(s);
	wl->flags |= WINLINK_SILENCE;

	if (options_get_number(&s->options, "visual-silence")) {
		for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
			c = ARRAY_ITEM(&clients, i);
			if (c == NULL || c->session != s)
				continue;
			status_message_set(c, "Silence in window %u",
			    winlink_find_by_window(&s->windows, w)->idx);
		}
	}

	return (1);
}

/* Check for content change in window. */
int
server_window_check_content(
    struct session *s, struct winlink *wl, struct window_pane *wp)
{
	struct client	*c;
	struct window	*w = wl->window;
	u_int		 i;
	char		*found, *ptr;

	/* Activity flag must be set for new content. */
	if (s->curw->window == w)
		w->flags &= ~WINDOW_ACTIVITY;

	if (!(w->flags & WINDOW_ACTIVITY) || wl->flags & WINLINK_CONTENT)
		return (0);
	if (s->curw == wl && !(s->flags & SESSION_UNATTACHED))
		return (0);

	ptr = options_get_string(&w->options, "monitor-content");
	if (ptr == NULL || *ptr == '\0')
		return (0);
	if ((found = window_pane_search(wp, ptr, NULL)) == NULL)
		return (0);
	free(found);

	if (options_get_number(&s->options, "bell-on-alert"))
		ring_bell(s);
	wl->flags |= WINLINK_CONTENT;

	if (options_get_number(&s->options, "visual-content")) {
		for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
			c = ARRAY_ITEM(&clients, i);
			if (c == NULL || c->session != s)
				continue;
			status_message_set(c, "Content in window %u",
			    winlink_find_by_window(&s->windows, w)->idx);
		}
	}

	return (1);
}

/* Ring terminal bell. */
void
ring_bell(struct session *s)
{
	struct client	*c;
	u_int		 i;

	for (i = 0; i < ARRAY_LENGTH(&clients); i++) {
		c = ARRAY_ITEM(&clients, i);
		if (c != NULL && c->session == s)
			tty_bell(&c->tty);
	}
}