#include "assets/data_loaders/glsl_loader.hpp"

#include <fstream>

std::error_code glsl_loader::load(
	const std::filesystem::path& filename,
	std::string& source
) {

	auto file = std::ifstream(filename);
	if (not file.is_open())
	{
		return std::make_error_code(std::errc::no_such_file_or_directory);
	}

	file.seekg(0, std::ios::end);
	const auto size = file.tellg();

	if (size == 0 or size == std::numeric_limits<std::streamsize>::max())
	{
		return std::make_error_code(std::errc::invalid_seek);
	}

	source.reserve(size);

	file.seekg(0, std::ios::beg);

	source.assign(
		std::istreambuf_iterator<char>(file),
		std::istreambuf_iterator<char>()
	);

	file.close();

	return {};
}