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/*
* This source code is released into the public domain.
*/
module;
#include <memory>
#include <ranges>
#include <string>
#include <vector>
export module nihil.posix:argv;
namespace nihil {
/*
* argv: stores a null-terminated array of nul-terminated C strings.
* argv::data() is suitable for passing to ::execv().
*
* Create an argv using argv::from_range(), which takes a range of
* string-like objects.
*/
export struct argv {
/*
* Create a new argv from a range.
*/
argv(std::from_range_t, std::ranges::range auto &&args)
{
for (auto &&arg : args)
add_arg(std::string_view(arg));
m_args.push_back(nullptr);
}
/*
* Create an argv from an initializer list.
*/
template<typename T>
explicit argv(std::initializer_list<T> &&args)
: argv(std::from_range, std::forward<decltype(args)>(args))
{
}
// Movable.
argv(argv &&) noexcept;
auto operator=(this argv &, argv &&other) -> argv &;
// Not copyable. TODO: for completeness, it probably should be.
argv(argv const &) = delete;
auto operator=(this argv &, argv const &other) -> argv& = delete;
~argv();
// Access the stored arguments.
[[nodiscard]] auto data(this argv const &self) -> char const * const *;
[[nodiscard]] auto data(this argv &self) -> char * const *;
[[nodiscard]] auto size(this argv const &self);
// Range access
[[nodiscard]] auto begin(this argv const &self);
[[nodiscard]] auto end(this argv const &self);
private:
// Use the from_range() factory method to create new instances.
argv();
// The argument pointers, including the null terminator.
// This can't be a vector<unique_ptr> because we need an array of
// char pointers to pass to exec.
std::vector<char *> m_args;
// Add a new argument to the array.
auto add_arg(this argv &self, std::string_view arg) -> void;
};
} // namespace nihil
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