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Check for the right flag to fix split-window -p, from Bryan Childs.

/* $OpenBSD: cmd-split-window.c,v 1.114 2024/03/06 21:32:39 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 <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tmux.h"

/*
 * Split a window (add a new pane).
 */

#define SPLIT_WINDOW_TEMPLATE "#{session_name}:#{window_index}.#{pane_index}"

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

const struct cmd_entry cmd_split_window_entry = {
	.name = "split-window",
	.alias = "splitw",

	.args = { "bc:de:fF:hIl:p:Pt:vZ", 0, -1, NULL },
	.usage = "[-bdefhIPvZ] [-c start-directory] [-e environment] "
		 "[-F format] [-l size] " CMD_TARGET_PANE_USAGE
		 "[shell-command]",

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

	.flags = 0,
	.exec = cmd_split_window_exec
};

static enum cmd_retval
cmd_split_window_exec(struct cmd *self, struct cmdq_item *item)
{
	struct args		*args = cmd_get_args(self);
	struct cmd_find_state	*current = cmdq_get_current(item);
	struct cmd_find_state	*target = cmdq_get_target(item);
	struct spawn_context	 sc = { 0 };
	struct client		*tc = cmdq_get_target_client(item);
	struct session		*s = target->s;
	struct winlink		*wl = target->wl;
	struct window		*w = wl->window;
	struct window_pane	*wp = target->wp, *new_wp;
	enum layout_type	 type;
	struct layout_cell	*lc;
	struct cmd_find_state	 fs;
	int			 size, flags, input;
	const char		*template;
	char			*cause = NULL, *cp;
	struct args_value	*av;
	u_int			 count = args_count(args), curval = 0;

	type = LAYOUT_TOPBOTTOM;
	if (args_has(args, 'h'))
		type = LAYOUT_LEFTRIGHT;

	/* If the 'p' flag is dropped then this bit can be moved into 'l'. */
	if (args_has(args, 'l') || args_has(args, 'p')) {
		if (args_has(args, 'f')) {
			if (type == LAYOUT_TOPBOTTOM)
				curval = w->sy;
			else
				curval = w->sx;
		} else {
			if (type == LAYOUT_TOPBOTTOM)
				curval = wp->sy;
			else
				curval = wp->sx;
		}
	}

	size = -1;
	if (args_has(args, 'l')) {
		size = args_percentage_and_expand(args, 'l', 0, INT_MAX, curval,
		    item, &cause);
	} else if (args_has(args, 'p')) {
		size = args_strtonum_and_expand(args, 'p', 0, 100, item,
		    &cause);
		if (cause == NULL)
			size = curval * size / 100;
	}
	if (cause != NULL) {
		cmdq_error(item, "size %s", cause);
		free(cause);
		return (CMD_RETURN_ERROR);
	}

	window_push_zoom(wp->window, 1, args_has(args, 'Z'));
	input = (args_has(args, 'I') && count == 0);

	flags = 0;
	if (args_has(args, 'b'))
		flags |= SPAWN_BEFORE;
	if (args_has(args, 'f'))
		flags |= SPAWN_FULLSIZE;
	if (input || (count == 1 && *args_string(args, 0) == '\0'))
		flags |= SPAWN_EMPTY;

	lc = layout_split_pane(wp, type, size, flags);
	if (lc == NULL) {
		cmdq_error(item, "no space for new pane");
		return (CMD_RETURN_ERROR);
	}

	sc.item = item;
	sc.s = s;
	sc.wl = wl;

	sc.wp0 = wp;
	sc.lc = lc;

	args_to_vector(args, &sc.argc, &sc.argv);
	sc.environ = environ_create();

	av = args_first_value(args, 'e');
	while (av != NULL) {
		environ_put(sc.environ, av->string, 0);
		av = args_next_value(av);
	}

	sc.idx = -1;
	sc.cwd = args_get(args, 'c');

	sc.flags = flags;
	if (args_has(args, 'd'))
		sc.flags |= SPAWN_DETACHED;
	if (args_has(args, 'Z'))
		sc.flags |= SPAWN_ZOOM;

	if ((new_wp = spawn_pane(&sc, &cause)) == NULL) {
		cmdq_error(item, "create pane failed: %s", cause);
		free(cause);
		if (sc.argv != NULL)
			cmd_free_argv(sc.argc, sc.argv);
		environ_free(sc.environ);
		return (CMD_RETURN_ERROR);
	}
	if (input) {
		switch (window_pane_start_input(new_wp, item, &cause)) {
		case -1:
			server_client_remove_pane(new_wp);
			layout_close_pane(new_wp);
			window_remove_pane(wp->window, new_wp);
			cmdq_error(item, "%s", cause);
			free(cause);
			if (sc.argv != NULL)
				cmd_free_argv(sc.argc, sc.argv);
			environ_free(sc.environ);
			return (CMD_RETURN_ERROR);
		case 1:
			input = 0;
			break;
		}
	}
	if (!args_has(args, 'd'))
		cmd_find_from_winlink_pane(current, wl, new_wp, 0);
	window_pop_zoom(wp->window);
	server_redraw_window(wp->window);
	server_status_session(s);

	if (args_has(args, 'P')) {
		if ((template = args_get(args, 'F')) == NULL)
			template = SPLIT_WINDOW_TEMPLATE;
		cp = format_single(item, template, tc, s, wl, new_wp);
		cmdq_print(item, "%s", cp);
		free(cp);
	}

	cmd_find_from_winlink_pane(&fs, wl, new_wp, 0);
	cmdq_insert_hook(s, item, &fs, "after-split-window");

	if (sc.argv != NULL)
		cmd_free_argv(sc.argc, sc.argv);
	environ_free(sc.environ);
	if (input)
		return (CMD_RETURN_WAIT);
	return (CMD_RETURN_NORMAL);
}