Function app_dirs::app_dir

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

Creates (if necessary) and returns 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 (/).

If the directory structure does not exist, this function will recursively create the full hierarchy. Therefore, a result of Ok guarantees that the returned path exists.