Deprecate BaseChecker.config

ChangeLog

@@ -23,6 +23,16 @@ Release date: TBA
 
   Closes #5224
 
+* The ``config`` attribute of ``BaseChecker`` has been deprecated. You can use ``checker.linter.config``
+  to access the global configuration object instead of a checker-specific object.
+
+  Ref #5392
+
+* The ``config`` attribute of ``PyLinter`` is now of the ``argparse.Namespace`` type instead of
+  ``optparse.Values``.
+
+  Ref #5392
+
 * ``OptionsManagerMixIn`` has been replaced with ``ArgumentsManager``. ``ArgumentsManager`` is considered
   private API and most methods that were public on ``OptionsManagerMixIn`` have now been deprecated and will
   be removed in a future release.

doc/whatsnew/2.14.rst

@@ -73,6 +73,16 @@ Other Changes
   Closes #5283
   Closes #1887
 
+* The ``config`` attribute of ``BaseChecker`` has been deprecated. You can use ``checker.linter.config``
+  to access the global configuration object instead of a checker-specific object.
+
+  Ref #5392
+
+* The ``config`` attribute of ``PyLinter`` is now of the ``argparse.Namespace`` type instead of
+  ``optparse.Values``.
+
+  Ref #5392
+
 * ``OptionsManagerMixIn`` has been replaced with ``ArgumentsManager``. ``ArgumentsManager`` is considered
   private API and most methods that were public on ``OptionsManagerMixIn`` have now been deprecated and will
   be removed in a future release.

pylint/config/arguments_manager.py

@@ -86,6 +86,10 @@ def __init__(self, prog: str, usage: Optional[str] = None) -> None:
         # verbosity
         self._maxlevel: int = 0
 
+    @property
+    def config(self) -> argparse.Namespace:
+        return self.namespace
+
     def _register_options_provider(self, provider: "_ArgumentsProvider") -> None:
         """Register an options provider and load its defaults."""
         for opt, optdict in provider.options:

pylint/config/arguments_provider.py

@@ -40,12 +40,21 @@ def __init__(self, arguments_manager: _ArgumentsManager) -> None:
         # pylint: disable=fixme
         # TODO: Optparse: Added to keep API parity with OptionsProvider
         # They should be removed/deprecated when refactoring the copied methods
-        self.config = optparse.Values()
+        self._config = optparse.Values()
         with warnings.catch_warnings():
             warnings.filterwarnings("ignore", category=DeprecationWarning)
             self.load_defaults()
         self.level = 0
 
+    @property
+    def config(self) -> optparse.Values:
+        warnings.warn(
+            "The checker-specific config attribute has been deprecated. Please use "
+            "'linter.config' to access the global configuration object.",
+            DeprecationWarning,
+        )
+        return self._config
+
     def load_defaults(self) -> None:
         """DEPRECATED: Initialize the provider using default values."""
         warnings.warn(

pylint/lint/pylinter.py

@@ -195,7 +195,7 @@ def _load_reporter_by_class(reporter_class: str) -> type:
 
 
 # pylint: disable=too-many-instance-attributes,too-many-public-methods
-class PyLinter(
+class PyLinter(  # type: ignore[misc]
     _ArgumentsManager,
     reporters.ReportsHandlerMixIn,
     checkers.BaseTokenChecker,

tests/test_func.py

@@ -123,19 +123,17 @@ def gen_tests(filter_rgx):
     gen_tests(FILTER_RGX),
     ids=[o[0] for o in gen_tests(FILTER_RGX)],
 )
-def test_functionality(module_file, messages_file, dependencies, recwarn):
+def test_functionality(
+    module_file, messages_file, dependencies, recwarn: pytest.WarningsRecorder
+) -> None:
     __test_functionality(module_file, messages_file, dependencies)
-    warning = None
-    try:
-        # Catch <unknown>:x: DeprecationWarning: invalid escape sequence
-        # so it's not shown during tests
-        warning = recwarn.pop()
-    except AssertionError:
-        pass
-    if warning is not None:
+    if recwarn.list:
         if module_file in TEST_WITH_EXPECTED_DEPRECATION and sys.version_info.minor > 5:
-            assert issubclass(warning.category, DeprecationWarning)
-            assert "invalid escape sequence" in str(warning.message)
+            assert any(
+                "invalid escape sequence" in str(i.message)
+                for i in recwarn.list
+                if issubclass(i.category, DeprecationWarning)
+            )
 
 
 def __test_functionality(

tests/test_functional.py

@@ -53,20 +53,16 @@ def test_functional(
         lint_test = testutils.LintModuleTest(test_file, pytestconfig)
     lint_test.setUp()
     lint_test.runTest()
-    warning = None
-    try:
-        # Catch <unknown>:x: DeprecationWarning: invalid escape sequence,
-        # so, it's not shown during tests
-        warning = recwarn.pop()
-    except AssertionError:
-        pass
-    if warning is not None:
+    if recwarn.list:
         if (
             test_file.base in TEST_WITH_EXPECTED_DEPRECATION
             and sys.version_info.minor > 5
         ):
-            assert issubclass(warning.category, DeprecationWarning)
-            assert "invalid escape sequence" in str(warning.message)
+            assert any(
+                "invalid escape sequence" in str(i.message)
+                for i in recwarn.list
+                if issubclass(i.category, DeprecationWarning)
+            )
 
 
 if __name__ == "__main__":

tests/test_regr.py

@@ -132,9 +132,9 @@ def test_pylint_config_attr() -> None:
     assert [c.name for c in pylinter.ancestors()] == expect
     assert list(astroid.Instance(pylinter).getattr("config"))
     inferred = list(astroid.Instance(pylinter).igetattr("config"))
-    assert len(inferred) == 1
-    assert inferred[0].root().name == "optparse"
-    assert inferred[0].name == "Values"
+    assert len(inferred) >= 1
+    assert inferred[0].root().name == "argparse"
+    assert inferred[0].name == "Namespace"
 
 
 @pytest.mark.timeout(30)