/* $OpenBSD: cmd-swap-pane.c,v 1.57 2026/10/09 13:12:14 nicm Exp $ */

/*

 * Copyright (c) 2009 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 two panes.

 */

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

const struct cmd_entry cmd_swap_pane_entry = {

  .name = "swap-pane",

  .description = "Swap two panes.",

  .alias = "swapp",

  .args = { "dDs:t:UZ", 0, 0, NULL },

  .usage = "[-dDUZ] " CMD_SRCDST_PANE_USAGE,

  .source = { 's', CMD_FIND_PANE, CMD_FIND_DEFAULT_MARKED },

  .target = { 't', CMD_FIND_PANE, 0 },

  .flags = 0,

  .exec = cmd_swap_pane_exec

};

static struct window_pane *

cmd_swap_pane_next_tiled_pane(struct window_pane *wp)

{

  while (wp != NULL && !layout_cell_is_tiled(wp->layout_cell))

    wp = TAILQ_NEXT(wp, entry);

  return (wp);

}

static struct window_pane *

cmd_swap_pane_prev_tiled_pane(struct window_pane *wp)

{

  while (wp != NULL && !layout_cell_is_tiled(wp->layout_cell))

    wp = TAILQ_PREV(wp, window_panes, entry);

  return (wp);

}

static enum cmd_retval

cmd_swap_pane_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 window   *src_w, *dst_w;

  struct window_pane  *tmp_wp, *src_wp, *dst_wp;

  struct layout_cell  *src_lc, *dst_lc;

  u_int      sx, sy, xoff, yoff;

  int      src_idx, dst_idx;

  dst_w = target->wl->window;

  dst_wp = target->wp;

  dst_idx = target->wl->idx;

  src_w = source->wl->window;

  src_wp = source->wp;

  src_idx = source->wl->idx;

  if (src_wp == src_w->modal || dst_wp == dst_w->modal) {

    cmdq_error(item, "pane is modal");

    return (CMD_RETURN_ERROR);

  }

  if (window_push_zoom(dst_w, 0, args_has(args, 'Z')))

    server_redraw_window(dst_w);

  if (args_has(args, 'D')) {

    if (window_pane_is_floating(dst_wp)) {

      cmdq_error(item, "cannot swap down on floating pane");

      goto error;

    }

    src_w = dst_w;

    src_wp = TAILQ_NEXT(dst_wp, entry);

    src_wp = cmd_swap_pane_next_tiled_pane(src_wp);

    if (src_wp == NULL) {

      src_wp = TAILQ_FIRST(&dst_w->panes);

      src_wp = cmd_swap_pane_next_tiled_pane(src_wp);

    }

  } else if (args_has(args, 'U')) {

    if (window_pane_is_floating(dst_wp)) {

      cmdq_error(item, "cannot swap up on floating pane");

      goto error;

    }

    src_w = dst_w;

    src_wp = TAILQ_PREV(dst_wp, window_panes, entry);

    src_wp = cmd_swap_pane_prev_tiled_pane(src_wp);

    if (src_wp == NULL) {

      src_wp = TAILQ_LAST(&dst_w->panes, window_panes);

      src_wp = cmd_swap_pane_prev_tiled_pane(src_wp);

    }

  }

  if (src_w != dst_w && window_push_zoom(src_w, 0, args_has(args, 'Z')))

    server_redraw_window(src_w);

  if (src_wp == dst_wp)

    goto out;

  server_client_remove_pane(src_wp);

  server_client_remove_pane(dst_wp);

  tmp_wp = TAILQ_PREV(dst_wp, window_panes, entry);

  TAILQ_REMOVE(&dst_w->panes, dst_wp, entry);

  TAILQ_REPLACE(&src_w->panes, src_wp, dst_wp, entry);

  if (tmp_wp == src_wp)

    tmp_wp = dst_wp;

  if (tmp_wp == NULL)

    TAILQ_INSERT_HEAD(&dst_w->panes, src_wp, entry);

  else

    TAILQ_INSERT_AFTER(&dst_w->panes, tmp_wp, src_wp, entry);

  tmp_wp = TAILQ_PREV(dst_wp, window_panes, zentry);

  TAILQ_REMOVE(&dst_w->z_index, dst_wp, zentry);

  TAILQ_REPLACE(&src_w->z_index, src_wp, dst_wp, zentry);

  if (tmp_wp == src_wp)

    tmp_wp = dst_wp;

  if (tmp_wp == NULL)

    TAILQ_INSERT_HEAD(&dst_w->z_index, src_wp, zentry);

  else

    TAILQ_INSERT_AFTER(&dst_w->z_index, tmp_wp, src_wp, zentry);

  src_lc = src_wp->layout_cell;

  dst_lc = dst_wp->layout_cell;

  src_lc->wp = dst_wp;

  dst_wp->layout_cell = src_lc;

  dst_lc->wp = src_wp;

  src_wp->layout_cell = dst_lc;

  src_wp->window = dst_w;

  options_set_parent(src_wp->options, dst_w->options);

  src_wp->flags |= (PANE_STYLECHANGED|PANE_THEMECHANGED);

  dst_wp->window = src_w;

  options_set_parent(dst_wp->options, src_w->options);

  dst_wp->flags |= (PANE_STYLECHANGED|PANE_THEMECHANGED);

  sx = src_wp->sx; sy = src_wp->sy;

  xoff = src_wp->xoff; yoff = src_wp->yoff;

  src_wp->xoff = dst_wp->xoff; src_wp->yoff = dst_wp->yoff;

  window_pane_resize(src_wp, dst_wp->sx, dst_wp->sy);

  dst_wp->xoff = xoff; dst_wp->yoff = yoff;

  window_pane_resize(dst_wp, sx, sy);

  if (!args_has(args, 'd')) {

    if (src_w != dst_w) {

      window_set_active_pane(src_w, dst_wp, 1);

      window_set_active_pane(dst_w, src_wp, 1);

    } else {

      tmp_wp = dst_wp;

      window_set_active_pane(src_w, tmp_wp, 1);

    }

  } else {

    if (src_w->active == src_wp)

      window_set_active_pane(src_w, dst_wp, 1);

    if (dst_w->active == dst_wp)

      window_set_active_pane(dst_w, src_wp, 1);

  }

  if (src_w != dst_w) {

    window_pane_stack_remove(&src_w->last_panes, src_wp);

    window_pane_stack_remove(&dst_w->last_panes, dst_wp);

    colour_palette_from_option(&src_wp->palette, src_wp->options);

    colour_palette_from_option(&dst_wp->palette, dst_wp->options);

    layout_fix_panes(src_w, NULL);

    redraw_invalidate_scene(src_w);

    server_redraw_window(src_w);

  }

  layout_fix_panes(dst_w, NULL);

  redraw_invalidate_scene(dst_w);

  server_redraw_window(dst_w);

  if (src_w != dst_w) {

    window_fire_pane_moved(src_wp, src_w, src_idx, dst_w, dst_idx);

    window_fire_pane_moved(dst_wp, dst_w, dst_idx, src_w, src_idx);

  }

  events_fire_window("window-layout-changed", src_w);

  if (src_w != dst_w)

    events_fire_window("window-layout-changed", dst_w);

out:

  if (window_pop_zoom(src_w))

    server_redraw_window(src_w);

  if (src_w != dst_w && window_pop_zoom(dst_w))

    server_redraw_window(dst_w);

  return (CMD_RETURN_NORMAL);

error:

  if (window_pop_zoom(dst_w))

    server_redraw_window(dst_w);

  return (CMD_RETURN_ERROR);

}