diff -r 73e448b2943d -r 68443f5be176 src/libraries.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/libraries.cpp	Sat Oct 05 23:47:03 2019 +0300
@@ -0,0 +1,196 @@
+#include <QSettings>
+#include "libraries.h"
+
+LibraryManager::LibraryManager(QObject* parent):
+	QAbstractTableModel{parent}
+{
+}
+
+LibraryManager::LibraryManager(QSettings* settings, QObject* parent) :
+	QAbstractTableModel{parent}
+{
+	this->restoreFromSettings(settings);
+}
+
+QVector<Library>::const_iterator LibraryManager::begin() const
+{
+	return this->libraries.begin();
+}
+
+QVector<Library>::const_iterator LibraryManager::end() const
+{
+	return this->libraries.end();
+}
+
+/**
+ * @brief Searches the libraries for the specified file name.
+ * @param fileName File to search for
+ * @return Full path to the file, or empty string if not found.
+ */
+QFileInfo LibraryManager::findFile(QString fileName) const
+{
+	QFileInfo path;
+	fileName.replace("\\", "/");
+	bool found = false;
+	for (const Library& library : this->libraries)
+	{
+		path = library.path.absoluteFilePath(fileName);
+		if (path.exists() && path.isFile())
+		{
+			found = true;
+			break;
+		}
+	}
+	if (not found)
+		path = {};
+	return path;
+}
+
+void LibraryManager::addLibrary(const Library& library)
+{
+	emit layoutAboutToBeChanged();
+	libraries.append(library);
+	emit layoutChanged();
+}
+
+const Library& LibraryManager::library(int libraryIndex) const
+{
+	return this->libraries[libraryIndex];
+}
+
+void LibraryManager::setLibraryPath(int libraryIndex, const QDir& path)
+{
+	if (this->isValidIndex(libraryIndex))
+	{
+		this->libraries[libraryIndex].path = path;
+		this->signalLibraryChange(libraryIndex);
+	}
+}
+
+void LibraryManager::setLibraryRole(int libraryIndex, const Library::Role role)
+{
+	if (this->isValidIndex(libraryIndex))
+	{
+		this->libraries[libraryIndex].role = role;
+		this->signalLibraryChange(libraryIndex);
+	}
+}
+
+void LibraryManager::restoreFromSettings(QSettings* settings)
+{
+	this->libraries = settings->value("libraries").value<Libraries>();
+}
+
+void LibraryManager::storeToSettings(QSettings* settings)
+{
+	QVariant librariesValue = QVariant::fromValue(this->libraries);
+	settings->setValue("libraries", librariesValue);
+}
+
+int LibraryManager::count() const
+{
+	return this->libraries.size();
+}
+
+bool LibraryManager::isValidIndex(int libraryIndex)
+{
+	return libraryIndex >= 0 && libraryIndex < this->libraries.size();
+}
+
+QString Library::libraryRoleName(const Role role)
+{
+	switch (role)
+	{
+	case Library::OfficialLibrary:
+		return LibraryManager::tr("Official library");
+	case Library::UnofficialLibrary:
+		return LibraryManager::tr("Unofficial library");
+	case Library::WorkingLibrary:
+		return LibraryManager::tr("Working library");
+	default:
+		return "???";
+	}
+}
+
+Qt::ItemFlags LibraryManager::flags(const QModelIndex& index) const
+{
+	Q_UNUSED(index);
+	return Qt::ItemIsEnabled | Qt::ItemIsSelectable;
+}
+
+QVariant LibraryManager::data(const QModelIndex& index, int role) const
+{
+	if (role != Qt::DisplayRole)
+	{
+		return {};
+	}
+	else
+	{
+		const int row = index.row();
+		const Column column = static_cast<Column>(index.column());
+		const Library& library = this->library(row);
+		switch (column)
+		{
+		case RoleColumn:
+			return Library::libraryRoleName(library.role);
+		case PathColumn:
+			return library.path.absolutePath();
+		}
+		return {};
+	}
+}
+
+QVariant LibraryManager::headerData(int section, Qt::Orientation orientation, int role) const
+{
+	if (orientation == Qt::Horizontal and role == Qt::DisplayRole)
+	{
+		switch(static_cast<Column>(section))
+		{
+		case PathColumn:
+			return tr("Path");
+		case RoleColumn:
+			return tr("Role");
+		}
+		return {};
+	}
+	else
+	{
+		return {};
+	}
+}
+
+int LibraryManager::rowCount(const QModelIndex& parent) const
+{
+	Q_UNUSED(parent)
+	return this->count();
+}
+
+int LibraryManager::columnCount(const QModelIndex& parent) const
+{
+	Q_UNUSED(parent)
+	return 2;
+}
+
+void LibraryManager::signalLibraryChange(int libraryIndex)
+{
+	const QModelIndex topLeft = this->index(libraryIndex, 0);
+	const QModelIndex bottomRight = this->index(libraryIndex, columnCount() - 1);
+	emit dataChanged(topLeft, bottomRight);
+}
+
+QDataStream& operator<<(QDataStream& stream, const Library& library)
+{
+	const QString path = library.path.absolutePath();
+	const int role = static_cast<int>(library.role);
+	return stream << path << role;
+}
+
+QDataStream& operator>>(QDataStream& stream, Library& library)
+{
+	QString path;
+	int role;
+	QDataStream& result = stream >> path >> role;
+	library.path = path;
+	library.role = static_cast<Library::Role>(role);
+	return result;
+}