Add enable-all-extensions option (#5315)

* Add ``enable-all-extensions`` option

Author: DanielNoord

ChangeLog

@@ -70,6 +70,9 @@ Release date: TBA
 
   Closes #3688
 
+* Added the ``--enable-all-extensions`` command line option. It will load all available extensions
+  which can be listed by running ``--list-extensions``
+
 * Fix bug with importing namespace packages with relative imports
 
   Closes #2967 and #5131

doc/whatsnew/2.12.rst

@@ -191,3 +191,6 @@ Other Changes
 
   Closes #5171
   Follow-up in #5065
+
+* Added the ``--enable-all-extensions`` command line option. It will load all available extensions
+  which can be listed by running ``--list-extensions``

pylint/lint/run.py

@@ -93,6 +93,7 @@ def __init__(
                     "init-hook": (cb_init_hook, True),
                     "rcfile": (self.cb_set_rcfile, True),
                     "load-plugins": (self.cb_add_plugins, True),
+                    "enable-all-extensions": (self.cb_enable_all_extensions, False),
                     "verbose": (self.cb_verbose_mode, False),
                     "output": (self.cb_set_output, True),
                 },
@@ -258,6 +259,15 @@ def __init__(
                         "will be displayed.",
                     },
                 ),
+                (
+                    "enable-all-extensions",
+                    {
+                        "action": "callback",
+                        "callback": self.cb_enable_all_extensions,
+                        "help": "Load and enable all available extensions. "
+                        "Use --list-extensions to see a list all available extensions.",
+                    },
+                ),
             ),
             option_groups=self.option_groups,
             pylintrc=self._rcfile,
@@ -475,3 +485,17 @@ def cb_list_groups(self, *args, **kwargs):
 
     def cb_verbose_mode(self, *args, **kwargs):
         self.verbose = True
+
+    def cb_enable_all_extensions(self, option_name: str, value: None) -> None:
+        """Callback to load and enable all available extensions"""
+        for filename in os.listdir(os.path.dirname(extensions.__file__)):
+            # pylint: disable=fixme
+            # TODO: Remove the check for deprecated check_docs after the extension has been removed
+            if (
+                filename.endswith(".py")
+                and not filename.startswith("_")
+                and not filename.startswith("check_docs")
+            ):
+                extension_name = f"pylint.extensions.{filename[:-3]}"
+                if extension_name not in self._plugins:
+                    self._plugins.append(extension_name)

tests/test_self.py

@@ -58,7 +58,7 @@
 import pytest
 from py._path.local import LocalPath  # type: ignore
 
-from pylint import modify_sys_path
+from pylint import extensions, modify_sys_path
 from pylint.constants import MAIN_CHECKER_NAME, MSG_TYPES_STATUS
 from pylint.lint import Run
 from pylint.lint.pylinter import PyLinter
@@ -1237,3 +1237,25 @@ def test_output_file_specified_in_rcfile(self, tmpdir: LocalPath) -> None:
             output_file,
             expected_output=expected,
         )
+
+    @staticmethod
+    def test_enable_all_extensions() -> None:
+        """Test to see if --enable-all-extensions does indeed load all extensions"""
+        # Record all extensions
+        plugins = []
+        for filename in os.listdir(os.path.dirname(extensions.__file__)):
+            # pylint: disable=fixme
+            # TODO: Remove the check for deprecated check_docs after the extension has been removed
+            if (
+                filename.endswith(".py")
+                and not filename.startswith("_")
+                and not filename.startswith("check_docs")
+            ):
+                plugins.append(f"pylint.extensions.{filename[:-3]}")
+
+        # Check if they are loaded
+        runner = Run(
+            ["--enable-all-extensions", join(HERE, "regrtest_data", "empty.py")],
+            exit=False,
+        )
+        assert sorted(plugins) == sorted(runner.linter._dynamic_plugins)