Find entry_points with importlib(.|_)metadata, drop setuptools …

…from `dependencies` (#385)

pylsp/config/config.py

@@ -3,15 +3,23 @@
 # pylint: disable=import-outside-toplevel
 
 import logging
+import sys
 from functools import lru_cache
 from typing import List, Mapping, Sequence, Union
 
-import pkg_resources
 import pluggy
 from pluggy._hooks import HookImpl
 
 from pylsp import _utils, hookspecs, uris, PYLSP
 
+# See compatibility note on `group` keyword:
+#   https://docs.python.org/3/library/importlib.metadata.html#entry-points
+if sys.version_info < (3, 10):  # pragma: no cover
+    from importlib_metadata import entry_points
+else:  # pragma: no cover
+    from importlib.metadata import entry_points
+
+
 log = logging.getLogger(__name__)
 
 # Sources of config, first source overrides next source
@@ -67,14 +75,15 @@ def __init__(self, root_uri, init_opts, process_id, capabilities):
         # Pluggy will skip loading a plugin if it throws a DistributionNotFound exception.
         # However I don't want all plugins to have to catch ImportError and re-throw. So here we'll filter
         # out any entry points that throw ImportError assuming one or more of their dependencies isn't present.
-        for entry_point in pkg_resources.iter_entry_points(PYLSP):
+        for entry_point in entry_points(group=PYLSP):
             try:
                 entry_point.load()
             except Exception as e:  # pylint: disable=broad-except
                 log.info("Failed to load %s entry point '%s': %s", PYLSP, entry_point.name, e)
                 self._pm.set_blocked(entry_point.name)
 
-        # Load the entry points into pluggy, having blocked any failing ones
+        # Load the entry points into pluggy, having blocked any failing ones.
+        # Despite the API name, recent Pluggy versions will use ``importlib_metadata``.
         self._pm.load_setuptools_entrypoints(PYLSP)
 
         for name, plugin in self._pm.list_name_plugin():

pyproject.toml

@@ -13,12 +13,12 @@ readme = "README.md"
 license = {text = "MIT"}
 requires-python = ">=3.8"
 dependencies = [
+    "docstring-to-markdown",
+    "importlib_metadata>=4.8.3;python_version<\"3.10\"",
     "jedi>=0.17.2,<0.20.0",
-    "python-lsp-jsonrpc>=1.0.0",
     "pluggy>=1.0.0",
-    "docstring-to-markdown",
+    "python-lsp-jsonrpc>=1.0.0",
     "ujson>=3.0.0",
-    "setuptools>=39.0.0",
 ]
 dynamic = ["version"]
 
@@ -104,4 +104,3 @@ addopts = "--cov-report html --cov-report term --junitxml=pytest.xml --cov pylsp
 
 [tool.coverage.run]
 concurrency = ["multiprocessing", "thread"]
-