1 files changed, 332 insertions, 0 deletions
diff --git a/src/content/subgames.cpp b/src/content/subgames.cpp
new file mode 100644
index 000000000..fd6231a1f
--- /dev/null
+++ b/src/content/subgames.cpp
@@ -0,0 +1,332 @@
+/*
+Minetest
+Copyright (C) 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 "content/subgames.h"
+#include "porting.h"
+#include "filesys.h"
+#include "settings.h"
+#include "log.h"
+#include "util/strfnd.h"
+#include "defaultsettings.h" // for override_default_settings
+#include "mapgen/mapgen.h"   // for MapgenParams
+#include "util/string.h"
+
+#ifndef SERVER
+#include "client/tile.h" // getImagePath
+#endif
+
+bool getGameMinetestConfig(const std::string &game_path, Settings &conf)
+{
+	std::string conf_path = game_path + DIR_DELIM + "minetest.conf";
+	return conf.readConfigFile(conf_path.c_str());
+}
+
+struct GameFindPath
+{
+	std::string path;
+	bool user_specific;
+	GameFindPath(const std::string &path, bool user_specific) :
+			path(path), user_specific(user_specific)
+	{
+	}
+};
+
+std::string getSubgamePathEnv()
+{
+	char *subgame_path = getenv("MINETEST_SUBGAME_PATH");
+	return subgame_path ? std::string(subgame_path) : "";
+}
+
+SubgameSpec findSubgame(const std::string &id)
+{
+	if (id.empty())
+		return SubgameSpec();
+	std::string share = porting::path_share;
+	std::string user = porting::path_user;
+
+	// Get games install locations
+	Strfnd search_paths(getSubgamePathEnv());
+
+	// Get all possible paths fo game
+	std::vector<GameFindPath> find_paths;
+	while (!search_paths.at_end()) {
+		std::string path = search_paths.next(PATH_DELIM);
+		find_paths.emplace_back(path + DIR_DELIM + id, false);
+		find_paths.emplace_back(path + DIR_DELIM + id + "_game", false);
+	}
+	find_paths.emplace_back(
+			user + DIR_DELIM + "games" + DIR_DELIM + id + "_game", true);
+	find_paths.emplace_back(user + DIR_DELIM + "games" + DIR_DELIM + id, true);
+	find_paths.emplace_back(
+			share + DIR_DELIM + "games" + DIR_DELIM + id + "_game", false);
+	find_paths.emplace_back(share + DIR_DELIM + "games" + DIR_DELIM + id, false);
+
+	// Find game directory
+	std::string game_path;
+	bool user_game = true; // Game is in user's directory
+	for (const GameFindPath &find_path : find_paths) {
+		const std::string &try_path = find_path.path;
+		if (fs::PathExists(try_path)) {
+			game_path = try_path;
+			user_game = find_path.user_specific;
+			break;
+		}
+	}
+
+	if (game_path.empty())
+		return SubgameSpec();
+
+	std::string gamemod_path = game_path + DIR_DELIM + "mods";
+
+	// Find mod directories
+	std::set<std::string> mods_paths;
+	if (!user_game)
+		mods_paths.insert(share + DIR_DELIM + "mods");
+	if (user != share || user_game)
+		mods_paths.insert(user + DIR_DELIM + "mods");
+
+	// Get meta
+	std::string conf_path = game_path + DIR_DELIM + "game.conf";
+	Settings conf;
+	conf.readConfigFile(conf_path.c_str());
+
+	std::string game_name;
+	if (conf.exists("name"))
+		game_name = conf.get("name");
+	else
+		game_name = id;
+
+	std::string game_author;
+	if (conf.exists("author"))
+		game_author = conf.get("author");
+
+	std::string menuicon_path;
+#ifndef SERVER
+	menuicon_path = getImagePath(
+			game_path + DIR_DELIM + "menu" + DIR_DELIM + "icon.png");
+#endif
+	return SubgameSpec(id, game_path, gamemod_path, mods_paths, game_name,
+			menuicon_path, game_author);
+}
+
+SubgameSpec findWorldSubgame(const std::string &world_path)
+{
+	std::string world_gameid = getWorldGameId(world_path, true);
+	// See if world contains an embedded game; if so, use it.
+	std::string world_gamepath = world_path + DIR_DELIM + "game";
+	if (fs::PathExists(world_gamepath)) {
+		SubgameSpec gamespec;
+		gamespec.id = world_gameid;
+		gamespec.path = world_gamepath;
+		gamespec.gamemods_path = world_gamepath + DIR_DELIM + "mods";
+
+		Settings conf;
+		std::string conf_path = world_gamepath + DIR_DELIM + "game.conf";
+		conf.readConfigFile(conf_path.c_str());
+
+		if (conf.exists("name"))
+			gamespec.name = conf.get("name");
+		else
+			gamespec.name = world_gameid;
+
+		return gamespec;
+	}
+	return findSubgame(world_gameid);
+}
+
+std::set<std::string> getAvailableGameIds()
+{
+	std::set<std::string> gameids;
+	std::set<std::string> gamespaths;
+	gamespaths.insert(porting::path_share + DIR_DELIM + "games");
+	gamespaths.insert(porting::path_user + DIR_DELIM + "games");
+
+	Strfnd search_paths(getSubgamePathEnv());
+
+	while (!search_paths.at_end())
+		gamespaths.insert(search_paths.next(PATH_DELIM));
+
+	for (const std::string &gamespath : gamespaths) {
+		std::vector<fs::DirListNode> dirlist = fs::GetDirListing(gamespath);
+		for (const fs::DirListNode &dln : dirlist) {
+			if (!dln.dir)
+				continue;
+
+			// If configuration file is not found or broken, ignore game
+			Settings conf;
+			std::string conf_path = gamespath + DIR_DELIM + dln.name +
+						DIR_DELIM + "game.conf";
+			if (!conf.readConfigFile(conf_path.c_str()))
+				continue;
+
+			// Add it to result
+			const char *ends[] = {"_game", NULL};
+			std::string shorter = removeStringEnd(dln.name, ends);
+			if (!shorter.empty())
+				gameids.insert(shorter);
+			else
+				gameids.insert(dln.name);
+		}
+	}
+	return gameids;
+}
+
+std::vector<SubgameSpec> getAvailableGames()
+{
+	std::vector<SubgameSpec> specs;
+	std::set<std::string> gameids = getAvailableGameIds();
+	for (const auto &gameid : gameids)
+		specs.push_back(findSubgame(gameid));
+	return specs;
+}
+
+#define LEGACY_GAMEID "minetest"
+
+bool getWorldExists(const std::string &world_path)
+{
+	return (fs::PathExists(world_path + DIR_DELIM + "map_meta.txt") ||
+			fs::PathExists(world_path + DIR_DELIM + "world.mt"));
+}
+
+std::string getWorldGameId(const std::string &world_path, bool can_be_legacy)
+{
+	std::string conf_path = world_path + DIR_DELIM + "world.mt";
+	Settings conf;
+	bool succeeded = conf.readConfigFile(conf_path.c_str());
+	if (!succeeded) {
+		if (can_be_legacy) {
+			// If map_meta.txt exists, it is probably an old minetest world
+			if (fs::PathExists(world_path + DIR_DELIM + "map_meta.txt"))
+				return LEGACY_GAMEID;
+		}
+		return "";
+	}
+	if (!conf.exists("gameid"))
+		return "";
+	// The "mesetint" gameid has been discarded
+	if (conf.get("gameid") == "mesetint")
+		return "minetest";
+	return conf.get("gameid");
+}
+
+std::string getWorldPathEnv()
+{
+	char *world_path = getenv("MINETEST_WORLD_PATH");
+	return world_path ? std::string(world_path) : "";
+}
+
+std::vector<WorldSpec> getAvailableWorlds()
+{
+	std::vector<WorldSpec> worlds;
+	std::set<std::string> worldspaths;
+
+	Strfnd search_paths(getWorldPathEnv());
+
+	while (!search_paths.at_end())
+		worldspaths.insert(search_paths.next(PATH_DELIM));
+
+	worldspaths.insert(porting::path_user + DIR_DELIM + "worlds");
+	infostream << "Searching worlds..." << std::endl;
+	for (const std::string &worldspath : worldspaths) {
+		infostream << "  In " << worldspath << ": " << std::endl;
+		std::vector<fs::DirListNode> dirvector = fs::GetDirListing(worldspath);
+		for (const fs::DirListNode &dln : dirvector) {
+			if (!dln.dir)
+				continue;
+			std::string fullpath = worldspath + DIR_DELIM + dln.name;
+			std::string name = dln.name;
+			// Just allow filling in the gameid always for now
+			bool can_be_legacy = true;
+			std::string gameid = getWorldGameId(fullpath, can_be_legacy);
+			WorldSpec spec(fullpath, name, gameid);
+			if (!spec.isValid()) {
+				infostream << "(invalid: " << name << ") ";
+			} else {
+				infostream << name << " ";
+				worlds.push_back(spec);
+			}
+		}
+		infostream << std::endl;
+	}
+	// Check old world location
+	do {
+		std::string fullpath = porting::path_user + DIR_DELIM + "world";
+		if (!fs::PathExists(fullpath))
+			break;
+		std::string name = "Old World";
+		std::string gameid = getWorldGameId(fullpath, true);
+		WorldSpec spec(fullpath, name, gameid);
+		infostream << "Old world found." << std::endl;
+		worlds.push_back(spec);
+	} while (false);
+	infostream << worlds.size() << " found." << std::endl;
+	return worlds;
+}
+
+bool loadGameConfAndInitWorld(const std::string &path, const SubgameSpec &gamespec)
+{
+	// Override defaults with those provided by the game.
+	// We clear and reload the defaults because the defaults
+	// might have been overridden by other subgame config
+	// files that were loaded before.
+	g_settings->clearDefaults();
+	set_default_settings(g_settings);
+	Settings game_defaults;
+	getGameMinetestConfig(gamespec.path, game_defaults);
+	override_default_settings(g_settings, &game_defaults);
+
+	infostream << "Initializing world at " << path << std::endl;
+
+	fs::CreateAllDirs(path);
+
+	// Create world.mt if does not already exist
+	std::string worldmt_path = path + DIR_DELIM "world.mt";
+	if (!fs::PathExists(worldmt_path)) {
+		Settings conf;
+
+		conf.set("gameid", gamespec.id);
+		conf.set("backend", "sqlite3");
+		conf.set("player_backend", "sqlite3");
+		conf.setBool("creative_mode", g_settings->getBool("creative_mode"));
+		conf.setBool("enable_damage", g_settings->getBool("enable_damage"));
+
+		if (!conf.updateConfigFile(worldmt_path.c_str()))
+			return false;
+	}
+
+	// Create map_meta.txt if does not already exist
+	std::string map_meta_path = path + DIR_DELIM + "map_meta.txt";
+	if (!fs::PathExists(map_meta_path)) {
+		verbosestream << "Creating map_meta.txt (" << map_meta_path << ")"
+			      << std::endl;
+		fs::CreateAllDirs(path);
+		std::ostringstream oss(std::ios_base::binary);
+
+		Settings conf;
+		MapgenParams params;
+
+		params.readParams(g_settings);
+		params.writeParams(&conf);
+		conf.writeLines(oss);
+		oss << "[end_of_params]\n";
+
+		fs::safeWriteToFile(map_meta_path, oss.str());
+	}
+	return true;
+}