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The target validity check used window_pane_visible but that may be false
if the pane is zoomed, so instead add a new function to just check if
the pane is actually on screen (most commands still want to accept panes
invisible by zoom). Also reject panes outside the window for various
special targets. Problem reported by Sean Haugh.

/* $OpenBSD: cmd-select-pane.c,v 1.35 2016/11/16 00:24:03 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 "tmux.h"

/*
 * Select pane.
 */

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

const struct cmd_entry cmd_select_pane_entry = {
	.name = "select-pane",
	.alias = "selectp",

	.args = { "DdegLlMmP:Rt:U", 0, 0 },
	.usage = "[-DdegLlMmRU] [-P style] " CMD_TARGET_PANE_USAGE,

	.tflag = CMD_PANE,

	.flags = 0,
	.exec = cmd_select_pane_exec
};

const struct cmd_entry cmd_last_pane_entry = {
	.name = "last-pane",
	.alias = "lastp",

	.args = { "det:", 0, 0 },
	.usage = "[-de] " CMD_TARGET_WINDOW_USAGE,

	.tflag = CMD_WINDOW,

	.flags = 0,
	.exec = cmd_select_pane_exec
};

static enum cmd_retval
cmd_select_pane_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args		*args = self->args;
	struct winlink		*wl = item->state.tflag.wl;
	struct window		*w = wl->window;
	struct session		*s = item->state.tflag.s;
	struct window_pane	*wp = item->state.tflag.wp, *lastwp, *markedwp;
	const char		*style;

	if (self->entry == &cmd_last_pane_entry || args_has(args, 'l')) {
		if (wl->window->last == NULL) {
			cmdq_error(item, "no last pane");
			return (CMD_RETURN_ERROR);
		}

		if (args_has(self->args, 'e'))
			w->last->flags &= ~PANE_INPUTOFF;
		else if (args_has(self->args, 'd'))
			w->last->flags |= PANE_INPUTOFF;
		else {
			server_unzoom_window(w);
			window_redraw_active_switch(w, w->last);
			if (window_set_active_pane(w, w->last)) {
				server_status_window(w);
				server_redraw_window_borders(w);
			}
		}

		return (CMD_RETURN_NORMAL);
	}

	if (args_has(args, 'm') || args_has(args, 'M')) {
		if (args_has(args, 'm') && !window_pane_visible(wp))
			return (CMD_RETURN_NORMAL);
		lastwp = marked_pane.wp;

		if (args_has(args, 'M') || server_is_marked(s, wl, wp))
			server_clear_marked();
		else
			server_set_marked(s, wl, wp);
		markedwp = marked_pane.wp;

		if (lastwp != NULL) {
			server_redraw_window_borders(lastwp->window);
			server_status_window(lastwp->window);
		}
		if (markedwp != NULL) {
			server_redraw_window_borders(markedwp->window);
			server_status_window(markedwp->window);
		}
		return (CMD_RETURN_NORMAL);
	}

	if (args_has(self->args, 'P') || args_has(self->args, 'g')) {
		if (args_has(args, 'P')) {
			style = args_get(args, 'P');
			if (style_parse(&grid_default_cell, &wp->colgc,
			    style) == -1) {
				cmdq_error(item, "bad style: %s", style);
				return (CMD_RETURN_ERROR);
			}
			wp->flags |= PANE_REDRAW;
		}
		if (args_has(self->args, 'g'))
			cmdq_print(item, "%s", style_tostring(&wp->colgc));
		return (CMD_RETURN_NORMAL);
	}

	if (args_has(self->args, 'L')) {
		server_unzoom_window(wp->window);
		wp = window_pane_find_left(wp);
	} else if (args_has(self->args, 'R')) {
		server_unzoom_window(wp->window);
		wp = window_pane_find_right(wp);
	} else if (args_has(self->args, 'U')) {
		server_unzoom_window(wp->window);
		wp = window_pane_find_up(wp);
	} else if (args_has(self->args, 'D')) {
		server_unzoom_window(wp->window);
		wp = window_pane_find_down(wp);
	}
	if (wp == NULL)
		return (CMD_RETURN_NORMAL);

	if (args_has(self->args, 'e')) {
		wp->flags &= ~PANE_INPUTOFF;
		return (CMD_RETURN_NORMAL);
	}
	if (args_has(self->args, 'd')) {
		wp->flags |= PANE_INPUTOFF;
		return (CMD_RETURN_NORMAL);
	}

	if (wp == w->active)
		return (CMD_RETURN_NORMAL);
	server_unzoom_window(wp->window);
	if (!window_pane_visible(wp)) {
		cmdq_error(item, "pane not visible");
		return (CMD_RETURN_ERROR);
	}
	window_redraw_active_switch(w, wp);
	if (window_set_active_pane(w, wp)) {
		server_status_window(w);
		server_redraw_window_borders(w);
	}

	return (CMD_RETURN_NORMAL);
}