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Some improvements and bug fixes for hooks:

- Prepare the state again before the "after" hooks are run, because the
  command may have killed or moved windows.

- Use the hooks list from the newly prepared target, not the old hooks
  list (only matters for new-session really).

- Correctly detect an invalid current state and ignore it in
  cmd_find_target ("killw; swapw").

- Change neww, new, killp, killw, splitw, swapp, swapw to update the
  current state (used if no explicit target is given) to something more
  useful after they have finished. For example, neww changes it to the
  newly created window.

Hooks are still relatively new and primitive so there are likely to be
more changes to come.

Parts based on bug reports from Uwe Werler and Iblis Lin.

/* $OpenBSD: cmd-new-window.c,v 1.61 2016/10/13 10:01:49 nicm Exp $ */

/*
 * Copyright (c) 2007 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 <stdlib.h>
#include <string.h>
#include <unistd.h>

#include "tmux.h"

/*
 * Create a new window.
 */

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

static enum cmd_retval	cmd_new_window_exec(struct cmd *, struct cmd_q *);

const struct cmd_entry cmd_new_window_entry = {
	.name = "new-window",
	.alias = "neww",

	.args = { "ac:dF:kn:Pt:", 0, -1 },
	.usage = "[-adkP] [-c start-directory] [-F format] [-n window-name] "
		 CMD_TARGET_WINDOW_USAGE " [command]",

	.tflag = CMD_WINDOW_INDEX,

	.flags = 0,
	.exec = cmd_new_window_exec
};

static enum cmd_retval
cmd_new_window_exec(struct cmd *self, struct cmd_q *cmdq)
{
	struct args		*args = self->args;
	struct session		*s = cmdq->state.tflag.s;
	struct winlink		*wl = cmdq->state.tflag.wl;
	struct client		*c = cmdq->state.c;
	int			 idx = cmdq->state.tflag.idx;
	const char		*cmd, *path, *template, *cwd, *to_free;
	char		       **argv, *cause, *cp;
	int			 argc, detached;
	struct format_tree	*ft;
	struct environ_entry	*envent;

	if (args_has(args, 'a')) {
		if ((idx = winlink_shuffle_up(s, wl)) == -1) {
			cmdq_error(cmdq, "no free window indexes");
			return (CMD_RETURN_ERROR);
		}
	}
	detached = args_has(args, 'd');

	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;
	}

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

	to_free = NULL;
	if (args_has(args, 'c')) {
		ft = format_create(cmdq, 0);
		format_defaults(ft, c, s, NULL, NULL);
		cwd = to_free = format_expand(ft, args_get(args, 'c'));
		format_free(ft);
	} else if (cmdq->client != NULL && cmdq->client->session == NULL)
		cwd = cmdq->client->cwd;
	else
		cwd = s->cwd;

	wl = NULL;
	if (idx != -1)
		wl = winlink_find_by_index(&s->windows, idx);
	if (wl != NULL && args_has(args, 'k')) {
		/*
		 * Can't use session_detach as it will destroy session if this
		 * makes it empty.
		 */
		notify_window_unlinked(s, wl->window);
		wl->flags &= ~WINLINK_ALERTFLAGS;
		winlink_stack_remove(&s->lastw, wl);
		winlink_remove(&s->windows, wl);

		/* Force select/redraw if current. */
		if (wl == s->curw) {
			detached = 0;
			s->curw = NULL;
		}
	}

	if (idx == -1)
		idx = -1 - options_get_number(s->options, "base-index");
	wl = session_new(s, args_get(args, 'n'), argc, argv, path, cwd, idx,
		&cause);
	if (wl == NULL) {
		cmdq_error(cmdq, "create window failed: %s", cause);
		free(cause);
		goto error;
	}
	if (!detached) {
		session_select(s, wl->idx);
		server_redraw_session_group(s);
	} else
		server_status_session_group(s);

	if (args_has(args, 'P')) {
		if ((template = args_get(args, 'F')) == NULL)
			template = NEW_WINDOW_TEMPLATE;

		ft = format_create(cmdq, 0);
		format_defaults(ft, c, s, wl, NULL);

		cp = format_expand(ft, template);
		cmdq_print(cmdq, "%s", cp);
		free(cp);

		format_free(ft);
	}

	cmd_find_from_winlink(&cmdq->current, s, wl);

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

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