Function GetEnv

src/string.cpp:854–859

* Get the environment variable using std::getenv and when it is an empty string (or nullptr), return \c std::nullopt instead. * @param variable The environment variable to read from. * @return The environment value, or \c std::nullopt. */

 * @return The environment value, or \c std::nullopt.
 */
std::optional<std::string_view> GetEnv(const char *variable)
{
	auto val = std::getenv(variable);
	if (val == nullptr || *val == '\0') return std::nullopt;
	return val;
}