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Better error reporting when applying custom layouts.

/* $OpenBSD: cmd-select-layout.c,v 1.41 2022/05/30 12:52:02 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"

/*
 * Switch window to selected layout.
 */

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

const struct cmd_entry cmd_select_layout_entry = {
	.name = "select-layout",
	.alias = "selectl",

	.args = { "Enopt:", 0, 1, NULL },
	.usage = "[-Enop] " CMD_TARGET_PANE_USAGE " [layout-name]",

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

	.flags = CMD_AFTERHOOK,
	.exec = cmd_select_layout_exec
};

const struct cmd_entry cmd_next_layout_entry = {
	.name = "next-layout",
	.alias = "nextl",

	.args = { "t:", 0, 0, NULL },
	.usage = CMD_TARGET_WINDOW_USAGE,

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

	.flags = CMD_AFTERHOOK,
	.exec = cmd_select_layout_exec
};

const struct cmd_entry cmd_previous_layout_entry = {
	.name = "previous-layout",
	.alias = "prevl",

	.args = { "t:", 0, 0, NULL },
	.usage = CMD_TARGET_WINDOW_USAGE,

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

	.flags = CMD_AFTERHOOK,
	.exec = cmd_select_layout_exec
};

static enum cmd_retval
cmd_select_layout_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args		*args = cmd_get_args(self);
	struct cmd_find_state	*target = cmdq_get_target(item);
	struct winlink		*wl = target->wl;
	struct window		*w = wl->window;
	struct window_pane	*wp = target->wp;
	const char		*layoutname;
	char			*oldlayout, *cause;
	int			 next, previous, layout;

	server_unzoom_window(w);

	next = (cmd_get_entry(self) == &cmd_next_layout_entry);
	if (args_has(args, 'n'))
		next = 1;
	previous = (cmd_get_entry(self) == &cmd_previous_layout_entry);
	if (args_has(args, 'p'))
		previous = 1;

	oldlayout = w->old_layout;
	w->old_layout = layout_dump(w->layout_root);

	if (next || previous) {
		if (next)
			layout_set_next(w);
		else
			layout_set_previous(w);
		goto changed;
	}

	if (args_has(args, 'E')) {
		layout_spread_out(wp);
		goto changed;
	}

	if (args_count(args) != 0)
		layoutname = args_string(args, 0);
	else if (args_has(args, 'o'))
		layoutname = oldlayout;
	else
		layoutname = NULL;

	if (!args_has(args, 'o')) {
		if (layoutname == NULL)
			layout = w->lastlayout;
		else
			layout = layout_set_lookup(layoutname);
		if (layout != -1) {
			layout_set_select(w, layout);
			goto changed;
		}
	}

	if (layoutname != NULL) {
		if (layout_parse(w, layoutname, &cause) == -1) {
			cmdq_error(item, "%s: %s", cause, layoutname);
			free(cause);
			goto error;
		}
		goto changed;
	}

	free(oldlayout);
	return (CMD_RETURN_NORMAL);

changed:
	free(oldlayout);
	recalculate_sizes();
	server_redraw_window(w);
	notify_window("window-layout-changed", w);
	return (CMD_RETURN_NORMAL);

error:
	free(w->old_layout);
	w->old_layout = oldlayout;
	return (CMD_RETURN_ERROR);
}