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Add a command queue to standardize and simplify commands that call other
commands and allow a command to block execution of subsequent
commands. This allows run-shell and if-shell to be synchronous which has
been much requested.

Each client has a default command queue and commands are consumed one at
a time from it. A command may suspend execution from the queue by
returning CMD_RETURN_WAIT and then resume it by calling cmd_continue() -
for example run-shell does this from the callback that is fired after
the job is freed.

When the command queue becomes empty, command clients are automatically
exited (unless attaching). A callback is also fired - this is used for
nested commands in, for example, if-shell which can block execution of
the client's cmdq until a new cmdq becomes empty.

Also merge all the old error/info/print functions together and lose the
old curclient/cmdclient distinction - a cmdq is bound to one client (or
none if in the configuration file), this is a command client if
c->session is NULL otherwise an attached client.

/* $OpenBSD: cmd-lock-server.c,v 1.14 2013/03/24 09:54:10 nicm Exp $ */

/*
 * Copyright (c) 2008 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 <pwd.h>
#include <string.h>
#include <unistd.h>

#include "tmux.h"

/*
 * Lock commands.
 */

enum cmd_retval	 cmd_lock_server_exec(struct cmd *, struct cmd_q *);

const struct cmd_entry cmd_lock_server_entry = {
	"lock-server", "lock",
	"", 0, 0,
	"",
	0,
	NULL,
	NULL,
	cmd_lock_server_exec
};

const struct cmd_entry cmd_lock_session_entry = {
	"lock-session", "locks",
	"t:", 0, 0,
	CMD_TARGET_SESSION_USAGE,
	0,
	NULL,
	NULL,
	cmd_lock_server_exec
};

const struct cmd_entry cmd_lock_client_entry = {
	"lock-client", "lockc",
	"t:", 0, 0,
	CMD_TARGET_CLIENT_USAGE,
	0,
	NULL,
	NULL,
	cmd_lock_server_exec
};

enum cmd_retval
cmd_lock_server_exec(struct cmd *self, unused struct cmd_q *cmdq)
{
	struct args	*args = self->args;
	struct client	*c;
	struct session	*s;

	if (self->entry == &cmd_lock_server_entry)
		server_lock();
	else if (self->entry == &cmd_lock_session_entry) {
		s = cmd_find_session(cmdq, args_get(args, 't'), 0);
		if (s == NULL)
			return (CMD_RETURN_ERROR);
		server_lock_session(s);
	} else {
		c = cmd_find_client(cmdq, args_get(args, 't'), 0);
		if (c == NULL)
			return (CMD_RETURN_ERROR);
		server_lock_client(c);
	}
	recalculate_sizes();

	return (CMD_RETURN_NORMAL);
}