fix dups and remove occurrance of incompatible API

CHANGES.md

@@ -2,9 +2,9 @@
 
 ## 4.0.2 (unreleased)
 
-
-- Nothing changed yet.
-
+- Fix #42: deprecated use of `pkg_resoures` to load entry points and parse requirements.
+  This enables mxdev to work on Python 3.12, where `pkg_resources` is no longer installed by default in virtual_envs.
+  [jensens]
 
 ## 4.0.1 (2024-03-01)
 

src/mxdev/entry_points.py

@@ -24,4 +24,4 @@ def load_eps_by_group(group: str) -> list:
     # XXX: for some reasons entry points are loaded twice. not sure if this
     #      is a glitch when installing with uv or something related to
     #      importlib.metadata.entry_points
-    return list(eps)  # type: ignore
+    return list(set(eps))  # type: ignore

src/mxdev/processing.py

@@ -1,10 +1,10 @@
 from .logging import logger
 from .state import State
 from .vcs.common import WorkingCopies
+from packaging.requirements import Requirement
 from pathlib import Path
 from urllib import parse
 from urllib import request
-from packaging.requirements import Requirement
 
 import typing
 

src/mxdev/vcs/common.py

@@ -151,19 +151,12 @@ def get_workingcopytypes() -> typing.Dict[str, typing.Type[BaseWorkingCopy]]:
     for entrypoint in load_eps_by_group(group):
         key = entrypoint.name
         workingcopytype = entrypoint.load()
-        if not entrypoint.dist:
-            continue
-        if entrypoint.dist.name == "mxdev":
-            _workingcopytypes[key] = workingcopytype
-            continue
         if key in addons:
             logger.error(
-                f"There already is a working copy type addon registered for '{key}'."
+                f"Duplicate workingcopy types registration '{key}' at "
+                f"{entrypoint.value} can not override {addons[key]}"
             )
             sys.exit(1)
-        logger.info(
-            f"Overwriting '{key}' with addon from '{entrypoint.dist.project_name}'."
-        )
         addons[key] = workingcopytype
     _workingcopytypes.update(addons)
     return _workingcopytypes