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Better take on reducing the name timer. Again check for name changes in
the main loop after events that may have changed the pane, but do so at
most once every 500 millis. If the pane changed too soon, use a timer to
ensure that a check happens later.

/* $OpenBSD: names.c,v 1.29 2015/08/29 00:29:15 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 <ctype.h>
#include <libgen.h>
#include <stdlib.h>
#include <string.h>

#include "tmux.h"

void	name_time_callback(int, short, void *);
int	name_time_expired(struct window *, struct timeval *);

void
name_time_callback(unused int fd, unused short events, void *arg)
{
	struct window	*w = arg;

	/* The event loop will call check_window_name for us on the way out. */
	log_debug("@%u name timer expired", w->id);
}

int
name_time_expired(struct window *w, struct timeval *tv)
{
	struct timeval	offset;

	timersub(tv, &w->name_time, &offset);
	if (offset.tv_sec != 0 || offset.tv_usec > NAME_INTERVAL)
		return (0);
	return (NAME_INTERVAL - offset.tv_usec);
}

void
check_window_name(struct window *w)
{
	struct timeval	 tv, next;
	char		*name;
	int		 left;

	if (w->active == NULL)
		return;

	if (!options_get_number(&w->options, "automatic-rename"))
		return;

	if (~w->active->flags & PANE_CHANGED) {
		log_debug("@%u active pane not changed", w->id);
		return;
	}
	log_debug("@%u active pane changed", w->id);

	gettimeofday(&tv, NULL);
	left = name_time_expired(w, &tv);
	if (left != 0) {
		if (!event_initialized(&w->name_event))
			evtimer_set(&w->name_event, name_time_callback, w);
		if (!evtimer_pending(&w->name_event, NULL)) {
			log_debug("@%u name timer queued (%d left)", w->id, left);
			timerclear(&next);
			next.tv_usec = left;
			event_add(&w->name_event, &next);
		} else
			log_debug("@%u name timer already queued (%d left)", w->id, left);
		return;
	}
	memcpy(&w->name_time, &tv, sizeof w->name_time);
	if (event_initialized(&w->name_event))
		evtimer_del(&w->name_event);

	w->active->flags &= ~PANE_CHANGED;

	name = format_window_name(w);
	if (strcmp(name, w->name) != 0) {
		log_debug("@%u new name %s (was %s)", w->id, name, w->name);
		window_set_name(w, name);
		server_status_window(w);
	} else
		log_debug("@%u name not changed (still %s)", w->id, w->name);

	free(name);
}

char *
default_window_name(struct window *w)
{
	char    *cmd, *s;

	cmd = cmd_stringify_argv(w->active->argc, w->active->argv);
	if (cmd != NULL && *cmd != '\0')
		s = parse_window_name(cmd);
	else
		s = parse_window_name(w->active->shell);
	free(cmd);
	return (s);
}

char *
format_window_name(struct window *w)
{
	struct format_tree	*ft;
	char			*fmt, *name;

	ft = format_create();
	format_defaults_window(ft, w);
	format_defaults_pane(ft, w->active);

	fmt = options_get_string(&w->options, "automatic-rename-format");
	name = format_expand(ft, fmt);

	format_free(ft);
	return (name);
}

char *
parse_window_name(const char *in)
{
	char	*copy, *name, *ptr;

	name = copy = xstrdup(in);
	if (strncmp(name, "exec ", (sizeof "exec ") - 1) == 0)
		name = name + (sizeof "exec ") - 1;

	while (*name == ' ' || *name == '-')
		name++;
	if ((ptr = strchr(name, ' ')) != NULL)
		*ptr = '\0';

	if (*name != '\0') {
		ptr = name + strlen(name) - 1;
		while (ptr > name && !isalnum((u_char)*ptr))
			*ptr-- = '\0';
	}

	if (*name == '/')
		name = basename(name);
	name = xstrdup(name);
	free(copy);
	return (name);
}