/* $OpenBSD: cmd-swap-window.c,v 1.28 2021/08/21 10:22:39 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 <stdlib.h>

#include "tmux.h"

/*
 * Swap one window with another.
 */

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

const struct cmd_entry cmd_swap_window_entry = {
	.name = "swap-window",
	.alias = "swapw",

	.args = { "ds:t:", 0, 0, NULL },
	.usage = "[-d] " CMD_SRCDST_WINDOW_USAGE,

	.source = { 's', CMD_FIND_WINDOW, CMD_FIND_DEFAULT_MARKED },
	.target = { 't', CMD_FIND_WINDOW, 0 },

	.flags = 0,
	.exec = cmd_swap_window_exec
};

static enum cmd_retval
cmd_swap_window_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args		*args = cmd_get_args(self);
	struct cmd_find_state	*source = cmdq_get_source(item);
	struct cmd_find_state	*target = cmdq_get_target(item);
	struct session		*src = source->s, *dst = target->s;
	struct session_group	*sg_src, *sg_dst;
	struct winlink		*wl_src = source->wl, *wl_dst = target->wl;
	struct window		*w_src, *w_dst;

	sg_src = session_group_contains(src);
	sg_dst = session_group_contains(dst);

	if (src != dst &&
	    sg_src != NULL &&
	    sg_dst != NULL &&
	    sg_src == sg_dst) {
		cmdq_error(item, "can't move window, sessions are grouped");
		return (CMD_RETURN_ERROR);
	}

	if (wl_dst->window == wl_src->window)
		return (CMD_RETURN_NORMAL);

	w_dst = wl_dst->window;
	TAILQ_REMOVE(&w_dst->winlinks, wl_dst, wentry);
	w_src = wl_src->window;
	TAILQ_REMOVE(&w_src->winlinks, wl_src, wentry);

	wl_dst->window = w_src;
	TAILQ_INSERT_TAIL(&w_src->winlinks, wl_dst, wentry);
	wl_src->window = w_dst;
	TAILQ_INSERT_TAIL(&w_dst->winlinks, wl_src, wentry);

	if (args_has(args, 'd')) {
		session_select(dst, wl_dst->idx);
		if (src != dst)
			session_select(src, wl_src->idx);
	}
	session_group_synchronize_from(src);
	server_redraw_session_group(src);
	if (src != dst) {
		session_group_synchronize_from(dst);
		server_redraw_session_group(dst);
	}
	recalculate_sizes();

	return (CMD_RETURN_NORMAL);
}