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Add "grouped sessions" which have independent name, options, current window and
so on but where the linked windows are synchronized (ie creating, killing
windows and so on are mirrored between the sessions). A grouped session may be
created by passing -t to new-session.

Had this around for a while, tested by a couple of people.

/* $OpenBSD: cmd-new-window.c,v 1.8 2009/10/10 10:02:48 nicm Exp $ */

/*
 * Copyright (c) 2007 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 <stdlib.h>

#include "tmux.h"

/*
 * Create a new window.
 */

int	cmd_new_window_parse(struct cmd *, int, char **, char **);
int	cmd_new_window_exec(struct cmd *, struct cmd_ctx *);
void	cmd_new_window_free(struct cmd *);
void	cmd_new_window_init(struct cmd *, int);
size_t	cmd_new_window_print(struct cmd *, char *, size_t);

struct cmd_new_window_data {
	char	*target;
	char	*name;
	char	*cmd;
	int	 flag_detached;
	int	 flag_kill;
};

const struct cmd_entry cmd_new_window_entry = {
	"new-window", "neww",
	"[-dk] [-n window-name] [-t target-window] [command]",
	0, 0,
	cmd_new_window_init,
	cmd_new_window_parse,
	cmd_new_window_exec,
	cmd_new_window_free,
	cmd_new_window_print
};

void
cmd_new_window_init(struct cmd *self, unused int arg)
{
	struct cmd_new_window_data	 *data;

	self->data = data = xmalloc(sizeof *data);
	data->target = NULL;
	data->name = NULL;
	data->cmd = NULL;
	data->flag_detached = 0;
	data->flag_kill = 0;
}

int
cmd_new_window_parse(struct cmd *self, int argc, char **argv, char **cause)
{
	struct cmd_new_window_data	*data;
	int				 opt;

	self->entry->init(self, KEYC_NONE);
	data = self->data;

	while ((opt = getopt(argc, argv, "dkt:n:")) != -1) {
		switch (opt) {
		case 'd':
			data->flag_detached = 1;
			break;
		case 'k':
			data->flag_kill = 1;
			break;
		case 't':
			if (data->target == NULL)
				data->target = xstrdup(optarg);
			break;
		case 'n':
			if (data->name == NULL)
				data->name = xstrdup(optarg);
			break;
		default:
			goto usage;
		}
	}
	argc -= optind;
	argv += optind;
	if (argc != 0 && argc != 1)
		goto usage;

	if (argc == 1)
		data->cmd = xstrdup(argv[0]);

	return (0);

usage:
	xasprintf(cause, "usage: %s %s", self->entry->name, self->entry->usage);

	self->entry->free(self);
	return (-1);
}

int
cmd_new_window_exec(struct cmd *self, struct cmd_ctx *ctx)
{
	struct cmd_new_window_data	*data = self->data;
	struct session			*s;
	struct winlink			*wl;
	char				*cmd, *cwd, *cause;
	int				 idx;

	if (data == NULL)
		return (0);

	if ((idx = cmd_find_index(ctx, data->target, &s)) == -2)
		return (-1);

	wl = NULL;
	if (idx != -1)
		wl = winlink_find_by_index(&s->windows, idx);
	if (wl != NULL) {
		if (data->flag_kill) {
			/*
			 * Can't use session_detach as it will destroy session
			 * if this makes it empty.
			 */
			session_alert_cancel(s, wl);
			winlink_stack_remove(&s->lastw, wl);
			winlink_remove(&s->windows, wl);

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

	cmd = data->cmd;
	if (cmd == NULL)
		cmd = options_get_string(&s->options, "default-command");
	if (ctx->cmdclient == NULL || ctx->cmdclient->cwd == NULL)
		cwd = options_get_string(&s->options, "default-path");
	else
		cwd = ctx->cmdclient->cwd;

	if (idx == -1)
		idx = -1 - options_get_number(&s->options, "base-index");
	wl = session_new(s, data->name, cmd, cwd, idx, &cause);
	if (wl == NULL) {
		ctx->error(ctx, "create window failed: %s", cause);
		xfree(cause);
		return (-1);
	}
	if (!data->flag_detached) {
		session_select(s, wl->idx);
		server_redraw_session_group(s);
	} else	
		server_status_session_group(s);

	return (0);
}

void
cmd_new_window_free(struct cmd *self)
{
	struct cmd_new_window_data	*data = self->data;

	if (data->target != NULL)
		xfree(data->target);
	if (data->name != NULL)
		xfree(data->name);
	if (data->cmd != NULL)
		xfree(data->cmd);
	xfree(data);
}

size_t
cmd_new_window_print(struct cmd *self, char *buf, size_t len)
{
	struct cmd_new_window_data	*data = self->data;
	size_t				 off = 0;

	off += xsnprintf(buf, len, "%s", self->entry->name);
	if (data == NULL)
		return (off);
	if (off < len && data->flag_detached)
		off += xsnprintf(buf + off, len - off, " -d");
	if (off < len && data->target != NULL)
		off += cmd_prarg(buf + off, len - off, " -t ", data->target);
	if (off < len && data->name != NULL)
		off += cmd_prarg(buf + off, len - off, " -n ", data->name);
	if (off < len && data->cmd != NULL)
		off += cmd_prarg(buf + off, len - off, " ", data->cmd);
	return (off);
}