Function app_dirs::get_app_dir

pub fn get_app_dir(
    t: AppDataType, 
    app: &AppInfo, 
    path: &str
) -> Result<PathBuf, AppDirsError>

Returns (but does not create) path to app-specific data subdirectory for provided data type and subdirectory path.

The path parameter should be a valid relative path separated by forward slashes (/).

A result of Ok means that we determined where the data SHOULD go, but it DOES NOT guarantee that the directory actually exists. (See app_dir.)