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/*
* This source code is released into the public domain.
*/
module;
/*
* tempfile: create a temporary file.
*/
#include <cstdint>
#include <expected>
#include <filesystem>
#include <string>
export module nihil.posix:tempfile;
import nihil.error;
import nihil.flagset;
import :fd;
namespace nihil {
struct tempfile_flags_tag {};
export using tempfile_flags_t = flagset<std::uint8_t, tempfile_flags_tag>;
// No flags.
export inline constexpr auto tempfile_none = tempfile_flags_t();
// Unlink the tempfile immediately after creating it
export inline constexpr auto tempfile_unlink = tempfile_flags_t::bit<0>();
export struct temporary_file final {
/*
* Fetch the file's fd.
*/
[[nodiscard]] auto fd(this temporary_file &) -> nihil::fd &;
/*
* Fetch the name of this file. If tempfile_unlink was specified,
* throws std::logic_error.
*/
[[nodiscard]] auto path(this temporary_file const &)
-> std::filesystem::path const &;
/*
* Release this temporary file, causing it to be deleted immediately.
* Throws std::logic_error if the file has already been released.
*/
auto release(this temporary_file &) -> void;
/*
* Destructor; unlink the file if we didn't already.
*/
~temporary_file();
// Not copyable.
temporary_file(temporary_file const &) = delete;
auto operator=(this temporary_file &, temporary_file const &)
-> temporary_file & = delete;
// Movable.
temporary_file(temporary_file &&other) noexcept;
auto operator=(this temporary_file &, temporary_file &&) noexcept
-> temporary_file &;
private:
// The file descriptor for the file.
nihil::fd m_fd;
std::filesystem::path m_path;
temporary_file(nihil::fd &&fd, std::filesystem::path) noexcept;
temporary_file(nihil::fd &&fd) noexcept;
friend auto tempfile(tempfile_flags_t flags)
-> std::expected<temporary_file, error>;
};
/*
* Create a temporary file and return it.
*/
export [[nodiscard]] auto tempfile(tempfile_flags_t flags = tempfile_none)
-> std::expected<temporary_file, error>;
} // namespace nihil
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