reintroduce a python 3.9 entrypints shim

Author: RonnyPfannschmidt

pyproject.toml

@@ -46,7 +46,6 @@ dependencies = [
   "setuptools", # >= 61",
   'tomli>=1; python_version < "3.11"',
   'typing-extensions; python_version < "3.10"',
-  'importlib-metadata>=4.6; python_version < "3.10"',
 ]
 [project.optional-dependencies]
 docs = [

src/setuptools_scm/_entrypoints.py

@@ -30,13 +30,27 @@
 log = _log.log.getChild("entrypoints")
 
 
-def entry_points(**kw: Any) -> im.EntryPoints:
-    if sys.version_info[:2] < (3, 10):
-        import importlib_metadata as im
-    else:
+if sys.version_info[:2] < (3, 10):
+
+    def entry_points(*, group: str, name: str | None = None) -> Any:
+        # Python 3.9: entry_points() returns dict, need to handle filtering manually
+        import importlib.metadata as im
+
+        eps = im.entry_points()  # Returns dict
+
+        group_eps = eps.get(group, [])
+        if name is not None:
+            return [ep for ep in group_eps if ep.name == name]
+        return group_eps
+else:
+
+    def entry_points(*, group: str, name: str | None = None) -> Any:
         import importlib.metadata as im
 
-    return im.entry_points(**kw)
+        kw = {"group": group}
+        if name is not None:
+            kw["name"] = name
+        return im.entry_points(**kw)
 
 
 def version_from_entrypoint(