Refactor registrar into multiple files

src/cli/register.py

@@ -37,7 +37,7 @@ def register_dataset(args):
     )
 
     # Register new dataset.
-    new_id = datareg.Registrar.register_dataset(
+    new_id = datareg.Registrar.dataset.create(
         args.relative_path,
         args.version,
         name=args.name,

src/dataregistry/__init__.py

@@ -1,7 +1,7 @@
 from ._version import __version__
 from .db_basic import *
 from .registrar import *
-from .registrar_util import *
+#from .registrar_util import *
 from .query import *
 from .git_util import *
 from .DataRegistry import DataRegistry

src/dataregistry/query.py

@@ -2,7 +2,7 @@
 from sqlalchemy import text, select
 import sqlalchemy.sql.sqltypes as sqltypes
 import pandas as pd
-from dataregistry.registrar_util import _form_dataset_path
+from dataregistry.registrar.registrar_util import _form_dataset_path
 from dataregistry.exceptions import DataRegistryNYI, DataRegistryException
 import os
 

src/dataregistry/registrar/__init__.py

@@ -0,0 +1 @@
+from .registrar import _OWNER_TYPES, Registrar