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Make command exec functions return an enum rather than -1/0/1 values and
add a new value to mean "leave client running but don't attach" to fix
problems with using some commands in a command sequence. Most of the
work by Thomas Adam, problem reported by "jspenguin" on SF bug 3535531.

/* $OpenBSD: cmd-select-pane.c,v 1.14 2012/07/11 07:10:15 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"

/*
 * Select pane.
 */

void		 cmd_select_pane_key_binding(struct cmd *, int);
enum cmd_retval	 cmd_select_pane_exec(struct cmd *, struct cmd_ctx *);

const struct cmd_entry cmd_select_pane_entry = {
	"select-pane", "selectp",
	"lDLRt:U", 0, 0,
	"[-lDLRU] " CMD_TARGET_PANE_USAGE,
	0,
	cmd_select_pane_key_binding,
	NULL,
	cmd_select_pane_exec
};

const struct cmd_entry cmd_last_pane_entry = {
	"last-pane", "lastp",
	"t:", 0, 0,
	CMD_TARGET_WINDOW_USAGE,
	0,
	NULL,
	NULL,
	cmd_select_pane_exec
};

void
cmd_select_pane_key_binding(struct cmd *self, int key)
{
	self->args = args_create(0);
	if (key == KEYC_UP)
		args_set(self->args, 'U', NULL);
	if (key == KEYC_DOWN)
		args_set(self->args, 'D', NULL);
	if (key == KEYC_LEFT)
		args_set(self->args, 'L', NULL);
	if (key == KEYC_RIGHT)
		args_set(self->args, 'R', NULL);
	if (key == 'o')
		args_set(self->args, 't', ":.+");
}

enum cmd_retval
cmd_select_pane_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct args		*args = self->args;
	struct winlink		*wl;
	struct window_pane	*wp;

	if (self->entry == &cmd_last_pane_entry || args_has(args, 'l')) {
		wl = cmd_find_window(ctx, args_get(args, 't'), NULL);
		if (wl == NULL)
			return (CMD_RETURN_ERROR);

		if (wl->window->last == NULL) {
			ctx->error(ctx, "no last pane");
			return (CMD_RETURN_ERROR);
		}

		window_set_active_pane(wl->window, wl->window->last);
		server_status_window(wl->window);
		server_redraw_window_borders(wl->window);

		return (CMD_RETURN_NORMAL);
	}

	if ((wl = cmd_find_pane(ctx, args_get(args, 't'), NULL, &wp)) == NULL)
		return (CMD_RETURN_ERROR);

	if (!window_pane_visible(wp)) {
		ctx->error(ctx, "pane not visible");
		return (CMD_RETURN_ERROR);
	}

	if (args_has(self->args, 'L'))
		wp = window_pane_find_left(wp);
	else if (args_has(self->args, 'R'))
		wp = window_pane_find_right(wp);
	else if (args_has(self->args, 'U'))
		wp = window_pane_find_up(wp);
	else if (args_has(self->args, 'D'))
		wp = window_pane_find_down(wp);
	if (wp == NULL) {
		ctx->error(ctx, "pane not found");
		return (CMD_RETURN_ERROR);
	}

	window_set_active_pane(wl->window, wp);
	server_status_window(wl->window);
	server_redraw_window_borders(wl->window);

	return (CMD_RETURN_NORMAL);
}