/*
 * This source code is released into the public domain.
 */

module;

#include <expected>
#include <filesystem>
#include <string>

export module nihil.posix:execv;

import nihil.error;
import :argv;
import :executor;

namespace nihil {

/*
 * execv: use a filename and an argument vector to call ::execve().
 * This is the lowest-level executor which all others are implemented
 * in terms of, if fexecve is not available.
 *
 * TODO: Should have a way to pass the environment (envp).
 */
export struct execv final
{
	using tag = exec_tag;

	execv(std::filesystem::path, argv &&) noexcept;

	[[nodiscard]] auto exec(this execv &) -> std::expected<void, error>;

	// Movable
	execv(execv &&) noexcept;
	auto operator=(this execv &, execv &&) noexcept -> execv &;

	// Not copyable (because m_args isn't copyable).
	execv(execv const &) = delete;
	auto operator=(this execv &, execv const &) -> execv & = delete;

private:
	std::filesystem::path	m_path;
	argv			m_args;
};

} // namespace nihil