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Minetest Lua Mainmenu API Reference 0.4.6
========================================

Introduction
-------------
The main menu is defined as a formspec by Lua in builtin/mainmenu.lua
Description of formspec language to show your menu is in lua_api.txt

Callbacks
---------
engine.buttonhandler(fields): called when a button is pressed.
^ fields = {name1 = value1, name2 = value2, ...}
engine.event_handler(event)
^ event: "MenuQuit", "KeyEnter", "ExitButton" or "EditBoxEnter"

Gamedata
--------
The "gamedata" table is read when calling engine.start(). It should contain:
{
	playername     = <name>,
	password       = <password>,
	address        = <IP/adress>,
	port           = <port>,
	selected_world = <index>, -- 0 for client mode
	singleplayer   = <true/false>,
}

Functions
---------
engine.start()
engine.close()

Filesystem:
engine.get_scriptdir()
^ returns directory of script
engine.get_modpath()
^ returns path to global modpath
engine.get_modstore_details(modid)
^ modid numeric id of mod in modstore
^ returns {
	id			= <numeric id of mod in modstore>,
	title		= <human readable title>,
	basename	= <basename for mod>,
	description = <description of mod>,
	author		= <author of mod>,
	download_url= <best match download url>,
	license		= <short description of license>,
	rating		= <float value of current rating>
}
engine.get_modstore_list()
^ returns {
	[1] = {
		id		 = <numeric id of mod in modstore>,
		title	 = <human readable title>,
		basename = <basename for mod>
	}
}
engine.get_gamepath()
^ returns path to global gamepath
engine.get_dirlist(path,onlydirs)
^ path to get subdirs from
^ onlydirs should result contain only dirs?
^ returns list of folders within path
engine.create_dir(absolute_path)
^ absolute_path to directory to create (needs to be absolute)
^ returns true/false
engine.delete_dir(absolute_path)
^ absolute_path to directory to delete (needs to be absolute)
^ returns true/false
engine.copy_dir(source,destination,keep_soure)
^ source folder
^ destination folder
^ keep_source DEFAULT true --> if set to false source is deleted after copying
^ returns true/false
engine.extract_zip(zipfile,destination) [unzip within path required]
^ zipfile to extract
^ destination folder to extract to
^ returns true/false
engine.download_file(url,target)
^ url to download
^ target to store to
^ returns true/false
engine.get_version()
^ returns current minetest version

GUI:
engine.update_formspec(formspec)
- engine.set_background(type, texturepath)
^ type: "background", "overlay", "header" or "footer"
engine.set_clouds(<true/false>)
engine.set_topleft_text(text)

Games:
engine.get_game(index)
^ returns {
	id               = <id>,
	path             = <full path to game>,
	gamemods_path    = <path>,
	name             = <name of game>,
	menuicon_path    = <full path to menuicon>,
	DEPRECATED:
	addon_mods_paths = {[1] = <path>,},
}
engine.get_games() -> table of all games in upper format

Favorites:
engine.get_favorites(location) -> list of favorites
^ location: "local" or "online"
^ returns {
	[1] = {
	clients       = <number of clients/nil>,
	clients_max   = <maximum number of clients/nil>,
	version       = <server version/nil>,
	password      = <true/nil>,
	creative      = <true/nil>,
	damage        = <true/nil>,
	pvp           = <true/nil>,
	description   = <server description/nil>,
	name          = <server name/nil>,
	address       = <address of server/nil>,
	port          = <port>
	},
}
engine.delete_favorite(id, location) -> success

Settings:
engine.setting_set(name, value)
engine.setting_get(name) -> string or nil
engine.setting_setbool(name, value)
engine.setting_getbool(name) -> bool or nil

Worlds:
engine.get_worlds() -> list of worlds
^ returns {
	[1] = {
	path   = <full path to world>,
	name   = <name of world>,
	gameid = <gameid of world>,
	},
}
engine.create_world(worldname, gameid)
engine.delete_world(index)


UI:
engine.get_textlist_index(textlistname) -> index
engine.show_keys_menu()
engine.file_open_dialog(formname,caption)
^ shows a file open dialog
^ formname is base name of dialog response returned in fields
^     -if dialog was accepted "_accepted" 
^^       will be added to fieldname containing the path
^     -if dialog was canceled "_cancelled" 
^        will be added to fieldname value is set to formname itself
^ returns nil or selected file/folder

Helpers:
dump(obj, dumped={})
^ Return object serialized as a string
string:split(separator)
^ eg. string:split("a,b", ",") == {"a","b"}
string:trim()
^ eg. string.trim("\n \t\tfoo bar\t ") == "foo bar"
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/*
Minetest
Copyright (C) 2010-2013 celeron55, Perttu Ahola <celeron55@gmail.com>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include "irrlicht.h" // createDevice

#include "mainmenumanager.h"
#include "irrlichttypes_extrabloated.h"
#include "chat_interface.h"
#include "debug.h"
#include "unittest/test.h"
#include "server.h"
#include "filesys.h"
#include "version.h"
#include "guiMainMenu.h"
#include "game.h"
#include "defaultsettings.h"
#include "gettext.h"
#include "log.h"
#include "quicktune.h"
#include "httpfetch.h"
#include "guiEngine.h"
#include "gameparams.h"
#include "database.h"
#include "config.h"
#include "porting.h"
#if USE_CURSES
	#include "terminal_chat_console.h"
#endif
#ifndef SERVER
#include "client/clientlauncher.h"
#endif

#ifdef HAVE_TOUCHSCREENGUI
	#include "touchscreengui.h"
#endif

#if !defined(SERVER) && \
	(IRRLICHT_VERSION_MAJOR == 1) && \
	(IRRLICHT_VERSION_MINOR == 8) && \
	(IRRLICHT_VERSION_REVISION == 2)
	#error "Irrlicht 1.8.2 is known to be broken - please update Irrlicht to version >= 1.8.3"
#endif

#define DEBUGFILE "debug.txt"
#define DEFAULT_SERVER_PORT 30000

typedef std::map<std::string, ValueSpec> OptionList;

/**********************************************************************
 * Private functions
 **********************************************************************/

static bool get_cmdline_opts(int argc, char *argv[], Settings *cmd_args);
static void set_allowed_options(OptionList *allowed_options);

static void print_help(const OptionList &allowed_options);
static void print_allowed_options(const OptionList &allowed_options);
static void print_version();
static void print_worldspecs(const std::vector<WorldSpec> &worldspecs,
							 std::ostream &os);
static void print_modified_quicktune_values();

static void list_game_ids();
static void list_worlds();
static void setup_log_params(const Settings &cmd_args);
static bool create_userdata_path();
static bool init_common(const Settings &cmd_args, int argc, char *argv[]);
static void startup_message();
static bool read_config_file(const Settings &cmd_args);
static void init_log_streams(const Settings &cmd_args);

static bool game_configure(GameParams *game_params, const Settings &cmd_args);
static void game_configure_port(GameParams *game_params, const Settings &cmd_args);

static bool game_configure_world(GameParams *game_params, const Settings &cmd_args);
static bool get_world_from_cmdline(GameParams *game_params, const Settings &cmd_args);
static bool get_world_from_config(GameParams *game_params, const Settings &cmd_args);
static bool auto_select_world(GameParams *game_params);
static std::string get_clean_world_path(const std::string &path);

static bool game_configure_subgame(GameParams *game_params, const Settings &cmd_args);
static bool get_game_from_cmdline(GameParams *game_params, const Settings &cmd_args);
static bool determine_subgame(GameParams *game_params);

static bool run_dedicated_server(const GameParams &game_params, const Settings &cmd_args);
static bool migrate_map_database(const GameParams &game_params, const Settings &cmd_args);

/**********************************************************************/


FileLogOutput file_log_output;

static OptionList allowed_options;

int main(int argc, char *argv[])
{
	int retval;
	debug_set_exception_handler();

	g_logger.registerThread("Main");
	g_logger.addOutputMaxLevel(&stderr_output, LL_ACTION);

	Settings cmd_args;
	bool cmd_args_ok = get_cmdline_opts(argc, argv, &cmd_args);
	if (!cmd_args_ok
			|| cmd_args.getFlag("help")
			|| cmd_args.exists("nonopt1")) {
		porting::attachOrCreateConsole();
		print_help(allowed_options);
		return cmd_args_ok ? 0 : 1;
	}
	if (cmd_args.getFlag("console"))
		porting::attachOrCreateConsole();

	if (cmd_args.getFlag("version")) {
		porting::attachOrCreateConsole();
		print_version();
		return 0;
	}

	setup_log_params(cmd_args);

	porting::signal_handler_init();

#ifdef __ANDROID__
	porting::initAndroid();
	porting::initializePathsAndroid();
#else
	porting::initializePaths();
#endif

	if (!create_userdata_path()) {
		errorstream << "Cannot create user data directory" << std::endl;
		return 1;
	}

	// Initialize debug stacks
	DSTACK(FUNCTION_NAME);

	// Debug handler
	BEGIN_DEBUG_EXCEPTION_HANDLER

	// List gameids if requested
	if (cmd_args.exists("gameid") && cmd_args.get("gameid") == "list") {
		list_game_ids();
		return 0;
	}

	// List worlds if requested
	if (cmd_args.exists("world") && cmd_args.get("world") == "list") {
		list_worlds();
		return 0;
	}

	if (!init_common(cmd_args, argc, argv))
		return 1;

	if (g_settings->getBool("enable_console"))
		porting::attachOrCreateConsole();

#ifndef __ANDROID__
	// Run unit tests
	if (cmd_args.getFlag("run-unittests")) {
		return run_tests();
	}
#endif

	GameParams game_params;
#ifdef SERVER
	porting::attachOrCreateConsole();
	game_params.is_dedicated_server = true;
#else
	const bool isServer = cmd_args.getFlag("server");
	if (isServer)
		porting::attachOrCreateConsole();
	game_params.is_dedicated_server = isServer;
#endif

	if (!game_configure(&game_params, cmd_args))
		return 1;

	sanity_check(!game_params.world_path.empty());

	infostream << "Using commanded world path ["
	           << game_params.world_path << "]" << std::endl;

	if (game_params.is_dedicated_server)
		return run_dedicated_server(game_params, cmd_args) ? 0 : 1;

#ifndef SERVER
	ClientLauncher launcher;
	retval = launcher.run(game_params, cmd_args) ? 0 : 1;
#else
	retval = 0;
#endif

	// Update configuration file
	if (g_settings_path != "")
		g_settings->updateConfigFile(g_settings_path.c_str());

	print_modified_quicktune_values();

	// Stop httpfetch thread (if started)
	httpfetch_cleanup();

	END_DEBUG_EXCEPTION_HANDLER

	return retval;
}


/*****************************************************************************
 * Startup / Init
 *****************************************************************************/


static bool get_cmdline_opts(int argc, char *argv[], Settings *cmd_args)
{
	set_allowed_options(&allowed_options);

	return cmd_args->parseCommandLine(argc, argv, allowed_options);
}

static void set_allowed_options(OptionList *allowed_options)
{
	allowed_options->clear();

	allowed_options->insert(std::make_pair("help", ValueSpec(VALUETYPE_FLAG,
			_("Show allowed options"))));
	allowed_options->insert(std::make_pair("version", ValueSpec(VALUETYPE_FLAG,
			_("Show version information"))));
	allowed_options->insert(std::make_pair("config", ValueSpec(VALUETYPE_STRING,
			_("Load configuration from specified file"))));
	allowed_options->insert(std::make_pair("port", ValueSpec(VALUETYPE_STRING,
			_("Set network port (UDP)"))));
	allowed_options->insert(std::make_pair("run-unittests", ValueSpec(VALUETYPE_FLAG,
			_("Run the unit tests and exit"))));
	allowed_options->insert(std::make_pair("map-dir", ValueSpec(VALUETYPE_STRING,
			_("Same as --world (deprecated)"))));
	allowed_options->insert(std::make_pair("world", ValueSpec(VALUETYPE_STRING,
			_("Set world path (implies local game) ('list' lists all)"))));
	allowed_options->insert(std::make_pair("worldname", ValueSpec(VALUETYPE_STRING,
			_("Set world by name (implies local game)"))));
	allowed_options->insert(std::make_pair("quiet", ValueSpec(VALUETYPE_FLAG,
			_("Print to console errors only"))));
	allowed_options->insert(std::make_pair("info", ValueSpec(VALUETYPE_FLAG,
			_("Print more information to console"))));
	allowed_options->insert(std::make_pair("verbose",  ValueSpec(VALUETYPE_FLAG,
			_("Print even more information to console"))));
	allowed_options->insert(std::make_pair("trace", ValueSpec(VALUETYPE_FLAG,
			_("Print enormous amounts of information to log and console"))));
	allowed_options->insert(std::make_pair("logfile", ValueSpec(VALUETYPE_STRING,
			_("Set logfile path ('' = no logging)"))));
	allowed_options->insert(std::make_pair("gameid", ValueSpec(VALUETYPE_STRING,
			_("Set gameid (\"--gameid list\" prints available ones)"))));
	allowed_options->insert(std::make_pair("migrate", ValueSpec(VALUETYPE_STRING,
			_("Migrate from current map backend to another (Only works when using minetestserver or with --server)"))));
	allowed_options->insert(std::make_pair("migrate-players", ValueSpec(VALUETYPE_STRING,
		_("Migrate from current players backend to another (Only works when using minetestserver or with --server)"))));
	allowed_options->insert(std::make_pair("terminal", ValueSpec(VALUETYPE_FLAG,
			_("Feature an interactive terminal (Only works when using minetestserver or with --server)"))));
#ifndef SERVER
	allowed_options->insert(std::make_pair("videomodes", ValueSpec(VALUETYPE_FLAG,
			_("Show available video modes"))));
	allowed_options->insert(std::make_pair("speedtests", ValueSpec(VALUETYPE_FLAG,
			_("Run speed tests"))));
	allowed_options->insert(std::make_pair("address", ValueSpec(VALUETYPE_STRING,
			_("Address to connect to. ('' = local game)"))));
	allowed_options->insert(std::make_pair("random-input", ValueSpec(VALUETYPE_FLAG,
			_("Enable random user input, for testing"))));
	allowed_options->insert(std::make_pair("server", ValueSpec(VALUETYPE_FLAG,
			_("Run dedicated server"))));
	allowed_options->insert(std::make_pair("name", ValueSpec(VALUETYPE_STRING,
			_("Set player name"))));
	allowed_options->insert(std::make_pair("password", ValueSpec(VALUETYPE_STRING,
			_("Set password"))));
	allowed_options->insert(std::make_pair("go", ValueSpec(VALUETYPE_FLAG,
			_("Disable main menu"))));
	allowed_options->insert(std::make_pair("console", ValueSpec(VALUETYPE_FLAG,
		_("Starts with the console (Windows only)"))));
#endif

}

static void print_help(const OptionList &allowed_options)
{
	std::cout << _("Allowed options:") << std::endl;
	print_allowed_options(allowed_options);
}

static void print_allowed_options(const OptionList &allowed_options)
{
	for (OptionList::const_iterator i = allowed_options.begin();
			i != allowed_options.end(); ++i) {
		std::ostringstream os1(std::ios::binary);
		os1 << "  --" << i->first;
		if (i->second.type != VALUETYPE_FLAG)
			os1 << _(" <value>");

		std::cout << padStringRight(os1.str(), 30);

		if (i->second.help)
			std::cout << i->second.help;

		std::cout << std::endl;
	}
}

static void print_version()
{
	std::cout << PROJECT_NAME_C " " << g_version_hash
	          << " (" << porting::getPlatformName() << ")" << std::endl;
#ifndef SERVER
	std::cout << "Using Irrlicht " << IRRLICHT_SDK_VERSION << std::endl;
#endif
	std::cout << "Build info: " << g_build_info << std::endl;
}

static void list_game_ids()
{
	std::set<std::string> gameids = getAvailableGameIds();
	for (std::set<std::string>::const_iterator i = gameids.begin();
			i != gameids.end(); ++i)
		std::cout << (*i) <<std::endl;
}

static void list_worlds()
{
	std::cout << _("Available worlds:") << std::endl;
	std::vector<WorldSpec> worldspecs = getAvailableWorlds();
	print_worldspecs(worldspecs, std::cout);
}

static void print_worldspecs(const std::vector<WorldSpec> &worldspecs,
							 std::ostream &os)
{
	for (size_t i = 0; i < worldspecs.size(); i++) {
		std::string name = worldspecs[i].name;
		std::string path = worldspecs[i].path;
		if (name.find(" ") != std::string::npos)
			name = std::string("'") + name + "'";
		path = std::string("'") + path + "'";
		name = padStringRight(name, 14);
		os << "  " << name << " " << path << std::endl;
	}
}

static void print_modified_quicktune_values()
{
	bool header_printed = false;
	std::vector<std::string> names = getQuicktuneNames();

	for (u32 i = 0; i < names.size(); i++) {
		QuicktuneValue val = getQuicktuneValue(names[i]);
		if (!val.modified)
			continue;
		if (!header_printed) {
			dstream << "Modified quicktune values:" << std::endl;
			header_printed = true;
		}
		dstream << names[i] << " = " << val.getString() << std::endl;
	}
}

static void setup_log_params(const Settings &cmd_args)
{
	// Quiet mode, print errors only
	if (cmd_args.getFlag("quiet")) {
		g_logger.removeOutput(&stderr_output);
		g_logger.addOutputMaxLevel(&stderr_output, LL_ERROR);
	}

	// If trace is enabled, enable logging of certain things
	if (cmd_args.getFlag("trace")) {
		dstream << _("Enabling trace level debug output") << std::endl;
		g_logger.setTraceEnabled(true);
		dout_con_ptr = &verbosestream; // This is somewhat old
		socket_enable_debug_output = true; // Sockets doesn't use log.h
	}

	// In certain cases, output info level on stderr
	if (cmd_args.getFlag("info") || cmd_args.getFlag("verbose") ||
			cmd_args.getFlag("trace") || cmd_args.getFlag("speedtests"))
		g_logger.addOutput(&stderr_output, LL_INFO);

	// In certain cases, output verbose level on stderr
	if (cmd_args.getFlag("verbose") || cmd_args.getFlag("trace"))
		g_logger.addOutput(&stderr_output, LL_VERBOSE);
}

static bool create_userdata_path()
{
	bool success;

#ifdef __ANDROID__
	if (!fs::PathExists(porting::path_user)) {
		success = fs::CreateDir(porting::path_user);
	} else {
		success = true;
	}
	porting::copyAssets();
#else
	// Create user data directory