Function xdg::get_runtime_dir_from_env

pub fn get_runtime_dir_from_env<'a, F>(get_env_var: &'a F) -> Option<PathBuf> where F: Fn(&'a str) -> Option<OsString>

Get $XDG_RUNTIME_DIR if found in the environment. This method allows having a custom environment.

Returns None if $XDG_RUNTIME_DIR is not set, in which case it is up to the application to fallback to a location that conforms to the specification.