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Rewrite command queue handling. Each client still has a command queue,
but there is also now a global command queue. Instead of command queues
being dispatched on demand from wherever the command happens to be
added, they are now all dispatched from the top level server
loop. Command queues may now also include callbacks as well as commands,
and items may be inserted after the current command as well as at the end.

This all makes command queues significantly more predictable and easier
to use, and avoids the complex multiple nested command queues used by
source-file, if-shell and friends.

A mass rename of struct cmdq to a better name (cmdq_item probably) is
coming.

/* $OpenBSD: cmd-new-window.c,v 1.63 2016/10/16 17:55:14 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;
	struct cmd_find_state	 fs;

	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);
	}

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

	cmd_find_from_winlink(&fs, s, wl);
	hooks_insert(s->hooks, cmdq, &fs, "after-new-window");

	return (CMD_RETURN_NORMAL);

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