/* $OpenBSD: cmd-swap-window.c,v 1.29 2025/10/30 13:52:08 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 (marked_pane.wl == wl_src)
                marked_pane.wl = wl_dst;
        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);
}