cran.lister: Move helper function to the bottom of the file

swh/lister/cran/lister.py

-# Copyright (C) 2019 The Software Heritage developers
+# Copyright (C) 2019-2020 The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
@@ -19,31 +19,6 @@ from swh.scheduler.utils import create_task_dict
 logger = logging.getLogger(__name__)
 
 
-def read_cran_data() -> List[Mapping[str, str]]:
-    """Execute r script to read cran listing.
-
-    """
-    filepath = pkg_resources.resource_filename('swh.lister.cran',
-                                               'list_all_packages.R')
-    logger.debug('script list-all-packages.R path: %s', filepath)
-    response = subprocess.run(filepath, stdout=subprocess.PIPE, shell=False)
-    return json.loads(response.stdout.decode('utf-8'))
-
-
-def compute_package_url(repo: Mapping[str, str]) -> str:
-    """Compute the package url from the repo dict.
-
-    Args:
-        repo: dict with key 'Package', 'Version'
-
-    Returns:
-        the package url
-
-    """
-    return 'https://cran.r-project.org/src/contrib' \
-        '/{Package}_{Version}.tar.gz'.format(**repo)
-
-
 class CRANLister(SimpleLister):
     MODEL = CRANModel
     LISTER_NAME = 'cran'
@@ -130,3 +105,28 @@ class CRANLister(SimpleLister):
             'origin_url': project_url,
             'origin_type': 'tar',
         }
+
+
+def read_cran_data() -> List[Mapping[str, str]]:
+    """Execute r script to read cran listing.
+
+    """
+    filepath = pkg_resources.resource_filename('swh.lister.cran',
+                                               'list_all_packages.R')
+    logger.debug('script list-all-packages.R path: %s', filepath)
+    response = subprocess.run(filepath, stdout=subprocess.PIPE, shell=False)
+    return json.loads(response.stdout.decode('utf-8'))
+
+
+def compute_package_url(repo: Mapping[str, str]) -> str:
+    """Compute the package url from the repo dict.
+
+    Args:
+        repo: dict with key 'Package', 'Version'
+
+    Returns:
+        the package url
+
+    """
+    return 'https://cran.r-project.org/src/contrib' \
+        '/{Package}_{Version}.tar.gz'.format(**repo)