xdgAllDataDirs

auto homeGuard = EnvGuard("HOME");
auto dataHomeGuard = EnvGuard("XDG_DATA_HOME");
auto dataDirsGuard = EnvGuard("XDG_DATA_DIRS");

auto newDataHome = "/home/myuser/data";
auto newDataDirs = ["/usr/local/data", "/usr/data"];
environment["XDG_DATA_HOME"] = newDataHome;
environment["XDG_DATA_DIRS"] = "/usr/local/data:/usr/data";

assert(xdgAllDataDirs() == newDataHome ~ newDataDirs);

environment.remove("XDG_DATA_HOME");
environment.remove("HOME");

assert(xdgAllDataDirs() == newDataDirs);