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Add a window or pane id "tag" to each format tree and use it to separate
jobs, this means that if the same job is used for different windows or
panes (for example in pane-border-format), it will be run separately for
each pane.

/* $OpenBSD: cmd-attach-session.c,v 1.68 2017/02/03 11:57:27 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:dErt:", 0, 0 },
	.usage = "[-dEr] [-c working-directory] " CMD_TARGET_SESSION_USAGE,

	.tflag = CMD_SESSION_WITHPANE,

	.flags = CMD_STARTSERVER,
	.exec = cmd_attach_session_exec
};

enum cmd_retval
cmd_attach_session(struct cmdq_item *item, int dflag, int rflag,
    const char *cflag, int Eflag)
{
	struct session		*s = item->state.tflag.s;
	struct client		*c = item->client, *c_loop;
	struct winlink		*wl = item->state.tflag.wl;
	struct window_pane	*wp = item->state.tflag.wp;
	char			*cause, *cwd;
	struct format_tree	*ft;

	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 (wl != NULL) {
		if (wp != NULL)
			window_set_active_pane(wp->window, wp);
		session_set_current(s, wl);
	}

	if (cflag != NULL) {
		ft = format_create(item, FORMAT_NONE, 0);
		format_defaults(ft, c, s, wl, wp);
		cwd = format_expand(ft, cflag);
		format_free(ft);

		free((void *)s->cwd);
		s->cwd = cwd;
	}

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

		c->session = s;
		status_timer_start(c);
		notify_client("client-session-changed", c);
		session_update_activity(s, NULL);
		gettimeofday(&s->last_attached_time, NULL);
		server_redraw_client(c);
		s->curw->flags &= ~WINLINK_ALERTFLAGS;
	} else {
		if (server_client_open(c, &cause) != 0) {
			cmdq_error(item, "open terminal failed: %s", cause);
			free(cause);
			return (CMD_RETURN_ERROR);
		}
		if (rflag)
			c->flags |= CLIENT_READONLY;

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

		c->session = s;
		server_client_set_key_table(c, NULL);
		status_timer_start(c);
		notify_client("client-session-changed", c);
		session_update_activity(s, NULL);
		gettimeofday(&s->last_attached_time, NULL);
		server_redraw_client(c);
		s->curw->flags &= ~WINLINK_ALERTFLAGS;

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

	return (CMD_RETURN_NORMAL);
}

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

	return (cmd_attach_session(item, args_has(args, 'd'),
	    args_has(args, 'r'), args_get(args, 'c'), args_has(args, 'E')));
}