Patch.h

// SPDX-License-Identifier: GPL-2.0-only

#pragma once

#include <filesystem>
#include <istream>
#include <optional>
#include <set>
#include <string>
#include <vector>

#include "../helpers/LastError.h"

namespace SlKernCVS {

class Patch {
public:
    using Header = std::vector<std::string>;
    using Paths = std::set<std::filesystem::path>;

    Patch() = delete;

    static std::optional<Patch> create(const std::filesystem::path &path);
    static std::optional<Patch> create(std::istream &is);

    const auto &header() const noexcept { return m_header; }
    const auto &paths() const noexcept { return m_paths; }

    static auto lastError() noexcept { return m_lastError.lastError(); }
private:
    Patch(Header &&header, Paths &&paths) : m_header(std::move(header)),
        m_paths(std::move(paths)) {}

    Header m_header;
    Paths m_paths;

    using LastError = SlHelpers::LastErrorStream<>;
    static thread_local LastError m_lastError;
};

}