Function GetCurrentLocale

src/strings.cpp:2157–2174

* Determine the current charset based on the environment * First check some default values, after this one we passed ourselves * and if none exist return the value for $LANG * @param param environment variable to check conditionally if default ones are not * set. Pass nullptr if you don't want additional checks. * @return return string containing current charset, or nullptr if not-dete

 * @return return string containing current charset, or nullptr if not-determinable
 */
std::optional<std::string> GetCurrentLocale(const char *param)
{
	auto env = GetEnv("LANGUAGE");
	if (env.has_value()) return std::string{*env};

	env = GetEnv("LC_ALL");
	if (env.has_value()) return std::string{*env};

	if (param != nullptr) {
		env = GetEnv(param);
		if (env.has_value()) return std::string{*env};
	}

	env = GetEnv("LANG");
	if (env.has_value()) return std::string{*env};

	return std::nullopt;
}
#else
std::optional<std::string> GetCurrentLocale(const char *param);
#endif /* !(defined(_WIN32) || defined(__APPLE__)) */