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Custom layouts. list-windows command displays the layout as a string (such as
"bb62,159x48,0,0{79x48,0,0,79x48,80,0}") and it can be applied to another
window (with the same number of panes or fewer) using select-layout.

/* $OpenBSD: cmd-select-layout.c,v 1.10 2010/06/29 03:30:13 nicm Exp $ */

/*
 * Copyright (c) 2009 Nicholas Marriott <nicm@users.sourceforge.net>
 *
 * 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 "tmux.h"

/*
 * Switch window to selected layout.
 */

void	cmd_select_layout_init(struct cmd *, int);
int	cmd_select_layout_exec(struct cmd *, struct cmd_ctx *);

const struct cmd_entry cmd_select_layout_entry = {
	"select-layout", "selectl",
	CMD_TARGET_WINDOW_USAGE " [layout-name]",
	CMD_ARG01, "",
	cmd_select_layout_init,
	cmd_target_parse,
	cmd_select_layout_exec,
	cmd_target_free,
	cmd_target_print
};

void
cmd_select_layout_init(struct cmd *self, int key)
{
	struct cmd_target_data	*data;

	cmd_target_init(self, key);
	data = self->data;

	switch (key) {
	case ('1' | KEYC_ESCAPE):
		data->arg = xstrdup("even-horizontal");
		break;
	case ('2' | KEYC_ESCAPE):
		data->arg = xstrdup("even-vertical");
		break;
	case ('3' | KEYC_ESCAPE):
		data->arg = xstrdup("main-horizontal");
		break;
	case ('4' | KEYC_ESCAPE):
		data->arg = xstrdup("main-vertical");
		break;
	case ('5' | KEYC_ESCAPE):
		data->arg = xstrdup("tiled");
		break;
	}
}

int
cmd_select_layout_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct cmd_target_data	*data = self->data;
	struct winlink		*wl;
	int			 layout;

	if ((wl = cmd_find_window(ctx, data->target, NULL)) == NULL)
		return (-1);

	if (data->arg == NULL) {
		layout = wl->window->lastlayout;
		if (layout == -1)
			return (0);
	} else if ((layout = layout_set_lookup(data->arg)) != -1) {
		layout = layout_set_select(wl->window, layout);
		ctx->info(ctx, "arranging in: %s", layout_set_name(layout));
	} else {
		if (layout_parse(wl->window, data->arg) == -1) {
			ctx->error(ctx, "can't set layout: %s", data->arg);
			return (-1);
		}
		ctx->info(ctx, "arranging in: %s", data->arg);
	}

	return (0);
}