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Mouse bindings and hooks set up an initial current state when running a
command. This is used for the session, window and pane for all commands
in the command sequence if there is no -t or -s.

However, using it for all commands in the command sequence means that if
the active pane or current session is changed, subsequent commands still
use the previous state. So make commands which explicitly change the
current state (such as neww and selectp) update it themselves for later
commands. Commands which may invalidate the state (like killp) are
already OK because an invalid state will be ignored.

Also fill in the current state for all key bindings rather than just the
mouse, so that any omissions are easier to spot.

/* $OpenBSD: cmd-attach-session.c,v 1.72 2017/04/22 08:56:24 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 cmd_find_state	*current = &item->shared->current;
	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;

	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 (wp != NULL)
			cmd_find_from_winlink_pane(current, wl, wp);
		else
			cmd_find_from_winlink(current, wl);
	}

	if (cflag != NULL) {
		free((void *)s->cwd);
		s->cwd = format_single(item, cflag, c, s, wl, wp);
	}

	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;
		if (~item->shared->flags & CMDQ_SHARED_REPEAT)
			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;
	} 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')));
}