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

module;

/*
 * Exec providers, mostly used for spawn().
 */

#include <expected>
#include <string>

#include "nihil.hh"

export module nihil.posix:exec;

import nihil.error;
import :execv;
import :fexecv;
import :argv;
import :fd;

namespace nihil {

/*
 * The lowest-level executor type, which is returned by other executors.
 * Prefer fexecve() if it's available, otherwise use execve().
 */
#ifdef NIHIL_HAVE_FEXECVE
using base_executor_type = fexecv;
#else
using base_executor_type = execv;
#endif

/*
 * execl: equivalent to execv, except the arguments are passed as a
 * variadic pack of string-like objects.
 */
export [[nodiscard]] auto execl(std::string_view path, auto &&...args)
	-> std::expected<base_executor_type, error>
{
	return execv(path, argv({std::string_view(args)...}));
}

/*
 * shell: run the process by invoking /bin/sh -c with the single argument,
 * equivalent to system(3).
 */
export [[nodiscard]] auto shell(std::string_view const &command)
	-> std::expected<base_executor_type, error>;

} // namespace nihil