// data struct
struct node
{
	enum file_type {
		file,
		folder
	};
	std::string name;
	file_type type;
	std::list<node> children;
};

// function
void fs::SaveFiles()
{
	std::ofstream ofs("file.config");
	SaveFileHelper(ofs, root);
}

void fs::SaveFileHelper(std::ofstream& ofs, node& n)
{
	ofs << ' ' << n.name << ' ';
	if (n.type == node::folder)
	{
		ofs << '[';
		for (auto& c : n.children)
		{
			SaveFileHelper(ofs, c);
		}
		ofs << "] ";
	}
}

// reserialize
void fs::LoadFiles()
{
	std::ifstream ifs("file.config");
	std::string start;
	ifs >> start;
	LoadFileHelper(ifs, root);
}

void fs::LoadFileHelper(std::ifstream& ifs, node& n)
{
	std::string token;
	while (ifs >> token)
	{
		if (token.empty())
			continue;
		if (token[0] == '[')
		{
			n.children.back().type = node::file_type::folder;
			if (token == "[]")
			{
				continue;
			}
			else
			{
				LoadFileHelper(ifs, n.children.back());
			}
		}
		else if (token[0] == ']')
		{
			return;
		}
		else
		{
			n.children.push_back(node{ .name = token, .type = node::file_type::file });
		}
	}
}