text: /* $OpenBSD$ */
  
  /*
   * 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.
   */
  
  enum cmd_retval	 cmd_swap_pane_exec(struct cmd *, struct cmd_q *);
  
  const struct cmd_entry cmd_swap_pane_entry = {
  	.name = "swap-pane",
  	.alias = "swapp",
  
  	.args = { "dDs:t:U", 0, 0 },
  	.usage = "[-dDU] " CMD_SRCDST_PANE_USAGE,
  
  	.sflag = CMD_PANE_MARKED,
  	.tflag = CMD_PANE,
  
  	.flags = 0,
  	.exec = cmd_swap_pane_exec
  };
  
  enum cmd_retval
  cmd_swap_pane_exec(struct cmd *self, struct cmd_q *cmdq)
  {
  	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;
  
  	dst_w = cmdq->state.tflag.wl->window;
  	dst_wp = cmdq->state.tflag.wp;
  	src_w = cmdq->state.sflag.wl->window;
  	src_wp = cmdq->state.sflag.wp;
  	server_unzoom_window(dst_w);
  
  	if (args_has(self->args, 'D')) {
  		src_w = dst_w;
  		src_wp = TAILQ_NEXT(dst_wp, entry);
  		if (src_wp == NULL)
  			src_wp = TAILQ_FIRST(&dst_w->panes);
  	} else if (args_has(self->args, 'U')) {
  		src_w = dst_w;
  		src_wp = TAILQ_PREV(dst_wp, window_panes, entry);
  		if (src_wp == NULL)
  			src_wp = TAILQ_LAST(&dst_w->panes, window_panes);
  	}
  	server_unzoom_window(src_w);
  
  #ifdef TMATE
  	if (src_w != dst_w) {
  		cmdq_error(cmdq, "swap pane on different window is not supported with tmate");
  		return (CMD_RETURN_ERROR);
  	}
  #endif
  
  	if (src_wp == dst_wp)
  		return (CMD_RETURN_NORMAL);
  
  	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);
  
  	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;
  	dst_wp->window = src_w;
  
  	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(self->args, 'd')) {
  		if (src_w != dst_w) {
  			window_set_active_pane(src_w, dst_wp);
  			window_set_active_pane(dst_w, src_wp);
  		} else {
  			tmp_wp = dst_wp;
  			if (!window_pane_visible(tmp_wp))
  				tmp_wp = src_wp;
  			window_set_active_pane(src_w, tmp_wp);
  		}
  	} else {
  		if (src_w->active == src_wp)
  			window_set_active_pane(src_w, dst_wp);
  		if (dst_w->active == dst_wp)
  			window_set_active_pane(dst_w, src_wp);
  	}
  	if (src_w != dst_w) {
  		if (src_w->last == src_wp)
  			src_w->last = NULL;
  		if (dst_w->last == dst_wp)
  			dst_w->last = NULL;
  	}
  	server_redraw_window(src_w);
  	server_redraw_window(dst_w);
  
  	return (CMD_RETURN_NORMAL);
  }
  