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Mouse bindings and hooks set up an initial current state when running a
command. This is used for the session, window and pane for all commands
in the command sequence if there is no -t or -s.

However, using it for all commands in the command sequence means that if
the active pane or current session is changed, subsequent commands still
use the previous state. So make commands which explicitly change the
current state (such as neww and selectp) update it themselves for later
commands. Commands which may invalidate the state (like killp) are
already OK because an invalid state will be ignored.

Also fill in the current state for all key bindings rather than just the
mouse, so that any omissions are easier to spot.

/* $OpenBSD: cmd-split-window.c,v 1.82 2017/04/22 08:56:24 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:dfF:l:hp:Pt:v", 0, -1 },
	.usage = "[-bdfhvP] [-c start-directory] [-F format] "
		 "[-p percentage|-l size] " CMD_TARGET_PANE_USAGE " [command]",

	.tflag = CMD_PANE,

	.flags = 0,
	.exec = cmd_split_window_exec
};

static enum cmd_retval
cmd_split_window_exec(struct cmd *self, struct cmdq_item *item)
{
	struct cmd_find_state	*current = &item->shared->current;
	struct args		*args = self->args;
	struct client		*c = item->state.c;
	struct session		*s = item->state.tflag.s;
	struct winlink		*wl = item->state.tflag.wl;
	struct window		*w = wl->window;
	struct window_pane	*wp = item->state.tflag.wp, *new_wp = NULL;
	struct environ		*env;
	const char		*cmd, *path, *shell, *template, *cwd, *to_free;
	char		       **argv, *cause, *new_cause, *cp;
	u_int			 hlimit;
	int			 argc, size, percentage;
	enum layout_type	 type;
	struct layout_cell	*lc;
	struct environ_entry	*envent;
	struct cmd_find_state    fs;

	server_unzoom_window(w);

	if (args->argc == 0) {
		cmd = options_get_string(s->options, "default-command");
		if (cmd != NULL && *cmd != '\0') {
			argc = 1;
			argv = (char **)&cmd;
		} else {
			argc = 0;
			argv = NULL;
		}
	} else {
		argc = args->argc;
		argv = args->argv;
	}

	to_free = NULL;
	if (args_has(args, 'c')) {
		cwd = args_get(args, 'c');
		to_free = cwd = format_single(item, cwd, c, s, NULL, NULL);
	} else if (item->client != NULL && item->client->session == NULL)
		cwd = item->client->cwd;
	else
		cwd = s->cwd;

	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);
			free(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);
			free(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;

	lc = layout_split_pane(wp, type, size, args_has(args, 'b'),
	    args_has(args, 'f'));
	if (lc == NULL) {
		cause = xstrdup("pane too small");
		goto error;
	}
	new_wp = window_add_pane(w, wp, args_has(args, 'b'), hlimit);
	layout_assign_pane(lc, new_wp);

	path = NULL;
	if (item->client != NULL && item->client->session == NULL)
		envent = environ_find(item->client->environ, "PATH");
	else
		envent = environ_find(s->environ, "PATH");
	if (envent != NULL)
		path = envent->value;

	env = environ_for_session(s);
	if (window_pane_spawn(new_wp, argc, argv, path, shell, cwd, env,
	    s->tio, &cause) != 0) {
		environ_free(env);
		goto error;
	}
	environ_free(env);

	server_redraw_window(w);

	if (!args_has(args, 'd')) {
		window_set_active_pane(w, new_wp);
		session_select(s, wl->idx);
		cmd_find_from_session(current, s);
		server_redraw_session(s);
	} else
		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, c, s, wl, new_wp);
		cmdq_print(item, "%s", cp);
		free(cp);
	}
	notify_window("window-layout-changed", w);

	if (to_free != NULL)
		free((void *)to_free);

	cmd_find_from_winlink_pane(&fs, wl, new_wp);
	hooks_insert(s->hooks, item, &fs, "after-split-window");

	return (CMD_RETURN_NORMAL);

error:
	if (new_wp != NULL) {
		layout_close_pane(new_wp);
		window_remove_pane(w, new_wp);
	}
	cmdq_error(item, "create pane failed: %s", cause);
	free(cause);

	if (to_free != NULL)
		free((void *)to_free);
	return (CMD_RETURN_ERROR);
}