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#ifndef INCLUDED_SRC_BUILDTOOL_FILE_SYSTEM_GIT_CAS_HPP
#define INCLUDED_SRC_BUILDTOOL_FILE_SYSTEM_GIT_CAS_HPP
#include <filesystem>
#include <memory>
#include <optional>
#include "src/buildtool/file_system/object_type.hpp"
extern "C" {
using git_odb = struct git_odb;
}
class GitCAS;
using GitCASPtr = std::shared_ptr<GitCAS const>;
/// \brief Git CAS that maintains its own libgit2 global state.
class GitCAS {
public:
static auto Open(std::filesystem::path const& repo_path) noexcept
-> GitCASPtr;
GitCAS() noexcept;
~GitCAS() noexcept;
// prohibit moves and copies
GitCAS(GitCAS const&) = delete;
GitCAS(GitCAS&& other) = delete;
auto operator=(GitCAS const&) = delete;
auto operator=(GitCAS&& other) = delete;
/// \brief Read object from CAS.
/// \param id The object id.
/// \param is_hex_id Specify whether `id` is hex string or raw.
[[nodiscard]] auto ReadObject(std::string const& id,
bool is_hex_id = false) const noexcept
-> std::optional<std::string>;
/// \brief Read object header from CAS.
/// \param id The object id.
/// \param is_hex_id Specify whether `id` is hex string or raw.
// Use with care. Quote from git2/odb.h:138:
// Note that most backends do not support reading only the header of an
// object, so the whole object will be read and then the header will be
// returned.
[[nodiscard]] auto ReadHeader(std::string const& id,
bool is_hex_id = false) const noexcept
-> std::optional<std::pair<std::size_t, ObjectType>>;
private:
git_odb* odb_{nullptr};
bool initialized_{false};
[[nodiscard]] auto OpenODB(std::filesystem::path const& repo_path) noexcept
-> bool;
};
#endif // INCLUDED_SRC_BUILDTOOL_FILE_SYSTEM_GIT_CAS_HPP
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