Mod management rework, part 1

- Replaced CModInfo class with constant ModDescription class
- Simplified mod loading logic
- Extracted some functionality from ModHandler into separate classes for
future reuse by Launcher

lib/modding/ModManager.h

@@ -0,0 +1,95 @@
+/*
+ * ModManager.h, part of VCMI engine
+ *
+ * Authors: listed in file AUTHORS in main folder
+ *
+ * License: GNU General Public License v2.0 or later
+ * Full text of license available in license.txt file, in main folder
+ *
+ */
+#pragma once
+
+#include "../json/JsonNode.h"
+
+VCMI_LIB_NAMESPACE_BEGIN
+
+class JsonNode;
+class ModDescription;
+struct CModVersion;
+
+using TModID = std::string;
+using TModList = std::vector<TModID>;
+using TModSet = std::set<TModID>;
+
+/// Provides interface to access list of locally installed mods
+class ModsState : boost::noncopyable
+{
+	TModList modList;
+
+	TModList scanModsDirectory(const std::string & modDir) const;
+
+public:
+	ModsState();
+
+	TModList getAllMods() const;
+};
+
+/// Provides interface to access or change current mod preset
+class ModsPresetState : boost::noncopyable
+{
+	JsonNode modConfig;
+
+	void saveConfiguration(const JsonNode & config);
+
+	void createInitialPreset();
+	void importInitialPreset();
+
+public:
+	ModsPresetState();
+
+	/// Returns true if mod is active in current preset
+	bool isModActive(const TModID & modName) const;
+
+	void activateModInPreset(const TModID & modName);
+	void dectivateModInAllPresets(const TModID & modName);
+
+	/// Returns list of all mods active in current preset. Mod order is unspecified
+	TModList getActiveMods() const;
+};
+
+/// Provides access to mod properties
+class ModsStorage : boost::noncopyable
+{
+	std::map<TModID, ModDescription> mods;
+
+public:
+	ModsStorage(const TModList & modsToLoad);
+
+	const ModDescription & getMod(const TModID & fullID) const;
+};
+
+/// Provides public interface to access mod state
+class ModManager : boost::noncopyable
+{
+	/// all currently active mods, in their load order
+	TModList activeMods;
+
+	/// Mods from current preset that failed to load due to invalid dependencies
+	TModList brokenMods;
+
+	std::unique_ptr<ModsState> modsState;
+	std::unique_ptr<ModsPresetState> modsPreset;
+	std::unique_ptr<ModsStorage> modsStorage;
+
+	void generateLoadOrder(TModList desiredModList);
+
+public:
+	ModManager();
+	~ModManager();
+
+	const ModDescription & getModDescription(const TModID & modID) const;
+	const TModList & getActiveMods() const;
+	bool isModActive(const TModID & modID) const;
+};
+
+VCMI_LIB_NAMESPACE_END