diff -r 73e448b2943d -r 68443f5be176 src/libraries.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/libraries.h	Sat Oct 05 23:47:03 2019 +0300
@@ -0,0 +1,61 @@
+#pragma once
+#include <QDir>
+#include <QAbstractTableModel>
+#include "main.h"
+
+class QSettings;
+
+struct Library
+{
+	enum Role
+	{
+		OfficialLibrary,
+		UnofficialLibrary,
+		WorkingLibrary,
+	} role;
+	QDir path;
+	static QString libraryRoleName(const Role role);
+};
+
+Q_DECLARE_METATYPE(Library)
+QDataStream &operator<<(QDataStream&, const Library&);
+QDataStream &operator>>(QDataStream&, Library&);
+
+using Libraries = QVector<Library>;
+Q_DECLARE_METATYPE(Libraries)
+
+class LibraryManager : public QAbstractTableModel
+{
+	Q_OBJECT
+public:
+	LibraryManager(QObject* parent = nullptr);
+	LibraryManager(QSettings* settings, QObject* parent = nullptr);
+	QVector<Library>::const_iterator begin() const;
+	QVector<Library>::const_iterator end() const;
+	QFileInfo findFile(QString fileName) const;
+	void addLibrary(const Library& library);
+	const Library& library(int libraryIndex) const;
+	void setLibraryPath(int libraryIndex, const QDir& path);
+	void setLibraryRole(int libraryIndex, const Library::Role role);
+	void restoreFromSettings(QSettings* settings);
+	void storeToSettings(QSettings* settings);
+	int count() const;
+	// Definitions for QAbstractTableModel
+	Qt::ItemFlags flags(const QModelIndex& index) const override;
+	QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
+	QVariant headerData(
+		int section,
+		Qt::Orientation orientation,
+		int role = Qt::DisplayRole) const override;
+	int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+	int columnCount(const QModelIndex &parent = QModelIndex()) const override;
+private:
+	enum Column
+	{
+		RoleColumn,
+		PathColumn
+	};
+	void signalLibraryChange(int library);
+	bool isValidIndex(int libraryIndex);
+	Libraries libraries;
+};