Main function of view.py.

def main(list_ids, model, contact_server, raw_data_id, show_raw,
         mysql_cfg='mysql_online'):
    """Main function of view.py."""
    if list_ids:
        preprocessing_desc, _, _ = _get_system(model)
        raw_datapath = os.path.join(utils.get_project_root(),
                                    preprocessing_desc['data-source'])
        _list_ids(raw_datapath)
    else:
        if contact_server:
            data = _fetch_data_from_server(raw_data_id, mysql_cfg)
            print("hwrt version: %s" % hwrt.__version__)
            if data is not None:
                display_data(data['data'], data['id'], model, show_raw)
        else:
            logging.info("RAW_DATA_ID %i does not exist or "
                         "database connection did not work.", raw_data_id)
            # The data was not on the server / the connection to the server did
            # not work. So try it again with the model data
            preprocessing_desc, _, _ = _get_system(model)
            raw_datapath = os.path.join(utils.get_project_root(),
                                        preprocessing_desc['data-source'])
            handwriting = _get_data_from_rawfile(raw_datapath, raw_data_id)
            if handwriting is None:
                logging.info("Recording with ID %i was not found in %s",
                             raw_data_id,
                             raw_datapath)
            else:
                print("hwrt version: %s" % hwrt.__version__)
                display_data(handwriting.raw_data_json,
                             handwriting.formula_id,
                             model,
                             show_raw)