discovery: Ensure back-compatibility

Allow clients to pass pkg_resources.Distribution since it was part of
public interface.

orangecanvas/registry/discovery.py

@@ -10,7 +10,6 @@
 import abc
 import os
 import sys
-import stat
 import logging
 import types
 import pkgutil
@@ -27,7 +26,7 @@
 from . import VERSION_HEX
 from . import cache, WidgetRegistry
 from . import utils
-from ..utils.pkgmeta import entry_points
+from ..utils.pkgmeta import entry_points, Distribution
 
 log = logging.getLogger(__name__)
 
@@ -72,6 +71,13 @@ def default_category_for_module(module):
     )
 
 
+def _dist_name(dist: Distribution) -> str:
+    try:
+        return dist.name
+    except AttributeError:  # pkg_resources.Distribution
+        return dist.project_name
+
+
 class WidgetDiscovery(object):
     """
     Base widget discovery runner.
@@ -213,7 +219,7 @@ def process_category_package(self, category, name=None, distribution=None):
                 cat_desc.name = default_category_name_for_module(category)
 
         if distribution is not None:
-            cat_desc.project_name = distribution.project_name
+            cat_desc.project_name = _dist_name(distribution)
 
         self.handle_category(cat_desc)
 
@@ -352,7 +358,7 @@ def widget_description(self, module, widget_name=None,
             desc.category = category_name
 
         if distribution is not None:
-            desc.project_name = distribution.project_name
+            desc.project_name = _dist_name(distribution)
 
         return desc
 
@@ -372,7 +378,7 @@ def cache_insert(self, module, mtime, description, distribution=None,
         project_name = project_version = None
 
         if distribution is not None:
-            project_name = distribution.project_name
+            project_name = _dist_name(distribution)
             project_version = distribution.version
 
         exc_type = exc_val = None
@@ -415,7 +421,7 @@ def cache_has_valid_entry(self, mod_path, distribution=None):
                 return False
 
             if distribution is not None:
-                if entry.project_name != distribution.project_name or \
+                if entry.project_name != _dist_name(distribution) or \
                         entry.project_version != distribution.version:
                     return False