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Change focus to be driven by events rather than walking all panes at end
of event loop, this way the ordering of in and out can be enforced.
GitHub issue 2808.

/* $OpenBSD: cmd-attach-session.c,v 1.86 2021/08/13 06:52:51 nicm Exp $ */

/*
 * Copyright (c) 2007 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 <errno.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tmux.h"

/*
 * Attach existing session to the current terminal.
 */

static enum cmd_retval	cmd_attach_session_exec(struct cmd *,
			    struct cmdq_item *);

const struct cmd_entry cmd_attach_session_entry = {
	.name = "attach-session",
	.alias = "attach",

	.args = { "c:dEf:rt:x", 0, 0 },
	.usage = "[-dErx] [-c working-directory] [-f flags] "
	         CMD_TARGET_SESSION_USAGE,

	/* -t is special */

	.flags = CMD_STARTSERVER,
	.exec = cmd_attach_session_exec
};

enum cmd_retval
cmd_attach_session(struct cmdq_item *item, const char *tflag, int dflag,
    int xflag, int rflag, const char *cflag, int Eflag, const char *fflag)
{
	struct cmd_find_state	*current = cmdq_get_current(item);
	struct cmd_find_state	 target;
	enum cmd_find_type	 type;
	int			 flags;
	struct client		*c = cmdq_get_client(item), *c_loop;
	struct session		*s;
	struct winlink		*wl;
	struct window_pane	*wp;
	char			*cwd, *cause;
	enum msgtype		 msgtype;

	if (RB_EMPTY(&sessions)) {
		cmdq_error(item, "no sessions");
		return (CMD_RETURN_ERROR);
	}

	if (c == NULL)
		return (CMD_RETURN_NORMAL);
	if (server_client_check_nested(c)) {
		cmdq_error(item, "sessions should be nested with care, "
		    "unset $TMUX to force");
		return (CMD_RETURN_ERROR);
	}

	if (tflag != NULL && tflag[strcspn(tflag, ":.")] != '\0') {
		type = CMD_FIND_PANE;
		flags = 0;
	} else {
		type = CMD_FIND_SESSION;
		flags = CMD_FIND_PREFER_UNATTACHED;
	}
	if (cmd_find_target(&target, item, tflag, type, flags) != 0)
		return (CMD_RETURN_ERROR);
	s = target.s;
	wl = target.wl;
	wp = target.wp;

	if (wl != NULL) {
		if (wp != NULL)
			window_set_active_pane(wp->window, wp, 1);
		session_set_current(s, wl);
		if (wp != NULL)
			cmd_find_from_winlink_pane(current, wl, wp, 0);
		else
			cmd_find_from_winlink(current, wl, 0);
	}

	if (cflag != NULL) {
		cwd = format_single(item, cflag, c, s, wl, wp);
		free((void *)s->cwd);
		s->cwd = cwd;
	}
	if (fflag)
		server_client_set_flags(c, fflag);
	if (rflag)
		c->flags |= (CLIENT_READONLY|CLIENT_IGNORESIZE);

	c->last_session = c->session;
	if (c->session != NULL) {
		if (dflag || xflag) {
			if (xflag)
				msgtype = MSG_DETACHKILL;
			else
				msgtype = MSG_DETACH;
			TAILQ_FOREACH(c_loop, &clients, entry) {
				if (c_loop->session != s || c == c_loop)
					continue;
				server_client_detach(c_loop, msgtype);
			}
		}
		if (!Eflag)
			environ_update(s->options, c->environ, s->environ);

		server_client_set_session(c, s);
		if (~cmdq_get_flags(item) & CMDQ_STATE_REPEAT)
			server_client_set_key_table(c, NULL);
	} else {
		if (server_client_open(c, &cause) != 0) {
			cmdq_error(item, "open terminal failed: %s", cause);
			free(cause);
			return (CMD_RETURN_ERROR);
		}

		if (dflag || xflag) {
			if (xflag)
				msgtype = MSG_DETACHKILL;
			else
				msgtype = MSG_DETACH;
			TAILQ_FOREACH(c_loop, &clients, entry) {
				if (c_loop->session != s || c == c_loop)
					continue;
				server_client_detach(c_loop, msgtype);
			}
		}
		if (!Eflag)
			environ_update(s->options, c->environ, s->environ);

		server_client_set_session(c, s);
		server_client_set_key_table(c, NULL);

		if (~c->flags & CLIENT_CONTROL)
			proc_send(c->peer, MSG_READY, -1, NULL, 0);
		notify_client("client-attached", c);
		c->flags |= CLIENT_ATTACHED;
	}

	return (CMD_RETURN_NORMAL);
}

static enum cmd_retval
cmd_attach_session_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args	*args = cmd_get_args(self);

	return (cmd_attach_session(item, args_get(args, 't'),
	    args_has(args, 'd'), args_has(args, 'x'), args_has(args, 'r'),
	    args_get(args, 'c'), args_has(args, 'E'), args_get(args, 'f')));
}