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Change the way the working directory for new processes is discovered. If
default-path isn't empty, it is used. Otherwise:

1) If tmux neww is run from the command line, the working directory of the
   client is used.

2) Otherwise sysctl KERN_PROC_CWD is used to retrieve the current
   working directory of the process in the active pane.

3) If that fails, the directory where the session was created is used.

Support code by Romain Francois, OpenBSD specific bits by me.

Note this requires a recent userland and kernel with KERN_PROC_CWD.

/* $OpenBSD: cmd-split-window.c,v 1.26 2011/12/09 16:28:18 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 <paths.h>
#include <stdlib.h>
#include <unistd.h>

#include "tmux.h"

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

void	cmd_split_window_key_binding(struct cmd *, int);
int	cmd_split_window_exec(struct cmd *, struct cmd_ctx *);

const struct cmd_entry cmd_split_window_entry = {
	"split-window", "splitw",
	"dl:hp:Pt:v", 0, 1,
	"[-dhvP] [-p percentage|-l size] [-t target-pane] [command]",
	0,
	cmd_split_window_key_binding,
	NULL,
	cmd_split_window_exec
};

void
cmd_split_window_key_binding(struct cmd *self, int key)
{
	self->args = args_create(0);
	if (key == '%')
		args_set(self->args, 'h', NULL);
}

int
cmd_split_window_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct args		*args = self->args;
	struct session		*s;
	struct winlink		*wl;
	struct window		*w;
	struct window_pane	*wp, *new_wp = NULL;
	struct environ		 env;
	char		 	*cmd, *cwd, *cause, *new_cause;
	const char		*shell;
	u_int			 hlimit, paneidx;
	int			 size, percentage;
	enum layout_type	 type;
	struct layout_cell	*lc;

	if ((wl = cmd_find_pane(ctx, args_get(args, 't'), &s, &wp)) == NULL)
		return (-1);
	w = wl->window;

	environ_init(&env);
	environ_copy(&global_environ, &env);
	environ_copy(&s->environ, &env);
	server_fill_environ(s, &env);

	if (args->argc == 0)
		cmd = options_get_string(&s->options, "default-command");
	else
		cmd = args->argv[0];
	cwd = cmd_get_default_path(ctx);

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

	size = -1;
	if (args_has(args, 'l')) {
		size = args_strtonum(args, 'l', 0, INT_MAX, &cause);
		if (cause != NULL) {
			xasprintf(&new_cause, "size %s", cause);
			xfree(cause);
			cause = new_cause;
			goto error;
		}
	} else if (args_has(args, 'p')) {
		percentage = args_strtonum(args, 'p', 0, INT_MAX, &cause);
		if (cause != NULL) {
			xasprintf(&new_cause, "percentage %s", cause);
			xfree(cause);
			cause = new_cause;
			goto error;
		}
		if (type == LAYOUT_TOPBOTTOM)
			size = (wp->sy * percentage) / 100;
		else
			size = (wp->sx * percentage) / 100;
	}
	hlimit = options_get_number(&s->options, "history-limit");

	shell = options_get_string(&s->options, "default-shell");
	if (*shell == '\0' || areshell(shell))
		shell = _PATH_BSHELL;

	if ((lc = layout_split_pane(wp, type, size)) == NULL) {
		cause = xstrdup("pane too small");
		goto error;
	}
	new_wp = window_add_pane(w, hlimit);
	if (window_pane_spawn(
	    new_wp, cmd, shell, cwd, &env, s->tio, &cause) != 0)
		goto error;
	layout_assign_pane(lc, new_wp);

	server_redraw_window(w);

	if (!args_has(args, 'd')) {
		window_set_active_pane(w, new_wp);
		session_select(s, wl->idx);
		server_redraw_session(s);
	} else
		server_status_session(s);

	environ_free(&env);

	if (args_has(args, 'P')) {
		if (window_pane_index(new_wp, &paneidx) != 0)
			fatalx("index not found");
		ctx->print(ctx, "%s:%u.%u", s->name, wl->idx, paneidx);
	}
	return (0);

error:
	environ_free(&env);
	if (new_wp != NULL)
		window_remove_pane(w, new_wp);
	ctx->error(ctx, "create pane failed: %s", cause);
	xfree(cause);
	return (-1);
}