Remove click patch (#3768)

Apparently this was only needed on Python 3.6. We've now dropped support
for 3.6 and 3.7. It's also not needed on new enough click.

CHANGES.md

@@ -43,6 +43,7 @@
 <!-- Changes to how Black is packaged, such as dependency requirements -->
 
 - Upgrade mypyc from 0.991 to 1.3 (#3697)
+- Remove patching of Click that mitigated errors on Python 3.6 with `LANG=C` (#3768)
 
 ### Parser
 

docs/contributing/reference/reference_functions.rst

@@ -165,8 +165,6 @@ Utilities
 
 .. autofunction:: black.linegen.normalize_invisible_parens
 
-.. autofunction:: black.patch_click
-
 .. autofunction:: black.nodes.preceding_leaf
 
 .. autofunction:: black.re_compile_maybe_verbose

src/black/__init__.py

@@ -1410,40 +1410,6 @@ def nullcontext() -> Iterator[None]:
     yield
 
 
-def patch_click() -> None:
-    """Make Click not crash on Python 3.6 with LANG=C.
-
-    On certain misconfigured environments, Python 3 selects the ASCII encoding as the
-    default which restricts paths that it can access during the lifetime of the
-    application.  Click refuses to work in this scenario by raising a RuntimeError.
-
-    In case of Black the likelihood that non-ASCII characters are going to be used in
-    file paths is minimal since it's Python source code.  Moreover, this crash was
-    spurious on Python 3.7 thanks to PEP 538 and PEP 540.
-    """
-    modules: List[Any] = []
-    try:
-        from click import core
-    except ImportError:
-        pass
-    else:
-        modules.append(core)
-    try:
-        # Removed in Click 8.1.0 and newer; we keep this around for users who have
-        # older versions installed.
-        from click import _unicodefun  # type: ignore
-    except ImportError:
-        pass
-    else:
-        modules.append(_unicodefun)
-
-    for module in modules:
-        if hasattr(module, "_verify_python3_env"):
-            module._verify_python3_env = lambda: None
-        if hasattr(module, "_verify_python_env"):
-            module._verify_python_env = lambda: None
-
-
 def patched_main() -> None:
     # PyInstaller patches multiprocessing to need freeze_support() even in non-Windows
     # environments so just assume we always need to call it if frozen.
@@ -1452,7 +1418,6 @@ def patched_main() -> None:
 
         freeze_support()
 
-    patch_click()
     main()
 
 

src/blackd/__init__.py

@@ -225,7 +225,6 @@ def parse_python_variant_header(value: str) -> Tuple[bool, Set[black.TargetVersi
 def patched_main() -> None:
     maybe_install_uvloop()
     freeze_support()
-    black.patch_click()
     main()
 
 

tests/test_black.py

@@ -1455,30 +1455,6 @@ def test_assert_equivalent_different_asts(self) -> None:
         with self.assertRaises(AssertionError):
             black.assert_equivalent("{}", "None")
 
-    def test_shhh_click(self) -> None:
-        try:
-            from click import _unicodefun  # type: ignore
-        except ImportError:
-            self.skipTest("Incompatible Click version")
-
-        if not hasattr(_unicodefun, "_verify_python_env"):
-            self.skipTest("Incompatible Click version")
-
-        # First, let's see if Click is crashing with a preferred ASCII charset.
-        with patch("locale.getpreferredencoding") as gpe:
-            gpe.return_value = "ASCII"
-            with self.assertRaises(RuntimeError):
-                _unicodefun._verify_python_env()
-        # Now, let's silence Click...
-        black.patch_click()
-        # ...and confirm it's silent.
-        with patch("locale.getpreferredencoding") as gpe:
-            gpe.return_value = "ASCII"
-            try:
-                _unicodefun._verify_python_env()
-            except RuntimeError as re:
-                self.fail(f"`patch_click()` failed, exception still raised: {re}")
-
     def test_root_logger_not_used_directly(self) -> None:
         def fail(*args: Any, **kwargs: Any) -> None:
             self.fail("Record created with root logger")