Types: don't leave generic types without a parameter

Enable `disallow_any_generics` and provide type information for missing parameters for type hints.

9 files changed, 49 insertions, 46 deletions

diff --git a/setup.cfg b/setup.cfg
index ea0a52c..fa4ff5d 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -85,6 +85,7 @@ disallow_subclassing_any = True
 disallow_untyped_calls = True
 disallow_untyped_defs = True
 disallow_incomplete_defs = True
+disallow_any_generics = True
 check_untyped_defs = True
 no_implicit_optional = True
 local_partial_types = True
diff --git a/src/click/_compat.py b/src/click/_compat.py
index 766d286..57faa91 100644
--- a/src/click/_compat.py
+++ b/src/click/_compat.py
@@ -50,7 +50,7 @@ def is_ascii_encoding(encoding: str) -> bool:
         return False
 
 
-def get_best_encoding(stream: t.IO) -> str:
+def get_best_encoding(stream: t.IO[t.Any]) -> str:
     """Returns the default stream encoding if not found."""
     rv = getattr(stream, "encoding", None) or sys.getdefaultencoding()
     if is_ascii_encoding(rv):
@@ -153,7 +153,7 @@ class _FixupStream:
         return True
 
 
-def _is_binary_reader(stream: t.IO, default: bool = False) -> bool:
+def _is_binary_reader(stream: t.IO[t.Any], default: bool = False) -> bool:
     try:
         return isinstance(stream.read(0), bytes)
     except Exception:
@@ -162,7 +162,7 @@ def _is_binary_reader(stream: t.IO, default: bool = False) -> bool:
         # closed.  In this case, we assume the default.
 
 
-def _is_binary_writer(stream: t.IO, default: bool = False) -> bool:
+def _is_binary_writer(stream: t.IO[t.Any], default: bool = False) -> bool:
     try:
         stream.write(b"")
     except Exception:
@@ -175,7 +175,7 @@ def _is_binary_writer(stream: t.IO, default: bool = False) -> bool:
     return True
 
 
-def _find_binary_reader(stream: t.IO) -> t.Optional[t.BinaryIO]:
+def _find_binary_reader(stream: t.IO[t.Any]) -> t.Optional[t.BinaryIO]:
     # We need to figure out if the given stream is already binary.
     # This can happen because the official docs recommend detaching
     # the streams to get binary streams.  Some code might do this, so
@@ -193,7 +193,7 @@ def _find_binary_reader(stream: t.IO) -> t.Optional[t.BinaryIO]:
     return None
 
 
-def _find_binary_writer(stream: t.IO) -> t.Optional[t.BinaryIO]:
+def _find_binary_writer(stream: t.IO[t.Any]) -> t.Optional[t.BinaryIO]:
     # We need to figure out if the given stream is already binary.
     # This can happen because the official docs recommend detaching
     # the streams to get binary streams.  Some code might do this, so
@@ -241,11 +241,11 @@ def _is_compatible_text_stream(
 
 
 def _force_correct_text_stream(
-    text_stream: t.IO,
+    text_stream: t.IO[t.Any],
     encoding: t.Optional[str],
     errors: t.Optional[str],
-    is_binary: t.Callable[[t.IO, bool], bool],
-    find_binary: t.Callable[[t.IO], t.Optional[t.BinaryIO]],
+    is_binary: t.Callable[[t.IO[t.Any], bool], bool],
+    find_binary: t.Callable[[t.IO[t.Any]], t.Optional[t.BinaryIO]],
     force_readable: bool = False,
     force_writable: bool = False,
 ) -> t.TextIO:
@@ -287,7 +287,7 @@ def _force_correct_text_stream(
 
 
 def _force_correct_text_reader(
-    text_reader: t.IO,
+    text_reader: t.IO[t.Any],
     encoding: t.Optional[str],
     errors: t.Optional[str],
     force_readable: bool = False,
@@ -303,7 +303,7 @@ def _force_correct_text_reader(
 
 
 def _force_correct_text_writer(
-    text_writer: t.IO,
+    text_writer: t.IO[t.Any],
     encoding: t.Optional[str],
     errors: t.Optional[str],
     force_writable: bool = False,
@@ -367,11 +367,11 @@ def get_text_stderr(
 
 
 def _wrap_io_open(
-    file: t.Union[str, os.PathLike, int],
+    file: t.Union[str, "os.PathLike[t.AnyStr]", int],
     mode: str,
     encoding: t.Optional[str],
     errors: t.Optional[str],
-) -> t.IO:
+) -> t.IO[t.Any]:
     """Handles not passing ``encoding`` and ``errors`` in binary mode."""
     if "b" in mode:
         return open(file, mode)
@@ -385,7 +385,7 @@ def open_stream(
     encoding: t.Optional[str] = None,
     errors: t.Optional[str] = "strict",
     atomic: bool = False,
-) -> t.Tuple[t.IO, bool]:
+) -> t.Tuple[t.IO[t.Any], bool]:
     binary = "b" in mode
 
     # Standard streams first. These are simple because they ignore the
@@ -456,11 +456,11 @@ def open_stream(
 
     f = _wrap_io_open(fd, mode, encoding, errors)
     af = _AtomicFile(f, tmp_filename, os.path.realpath(filename))
-    return t.cast(t.IO, af), True
+    return t.cast(t.IO[t.Any], af), True
 
 
 class _AtomicFile:
-    def __init__(self, f: t.IO, tmp_filename: str, real_filename: str) -> None:
+    def __init__(self, f: t.IO[t.Any], tmp_filename: str, real_filename: str) -> None:
         self._f = f
         self._tmp_filename = tmp_filename
         self._real_filename = real_filename
@@ -494,7 +494,7 @@ def strip_ansi(value: str) -> str:
     return _ansi_re.sub("", value)
 
 
-def _is_jupyter_kernel_output(stream: t.IO) -> bool:
+def _is_jupyter_kernel_output(stream: t.IO[t.Any]) -> bool:
     while isinstance(stream, (_FixupStream, _NonClosingTextIOWrapper)):
         stream = stream._stream
 
@@ -502,7 +502,7 @@ def _is_jupyter_kernel_output(stream: t.IO) -> bool:
 
 
 def should_strip_ansi(
-    stream: t.Optional[t.IO] = None, color: t.Optional[bool] = None
+    stream: t.Optional[t.IO[t.Any]] = None, color: t.Optional[bool] = None
 ) -> bool:
     if color is None:
         if stream is None:
@@ -576,7 +576,7 @@ def term_len(x: str) -> int:
     return len(strip_ansi(x))
 
 
-def isatty(stream: t.IO) -> bool:
+def isatty(stream: t.IO[t.Any]) -> bool:
     try:
         return stream.isatty()
     except Exception:
diff --git a/src/click/_termui_impl.py b/src/click/_termui_impl.py
index 4b979bc..1caaad8 100644
--- a/src/click/_termui_impl.py
+++ b/src/click/_termui_impl.py
@@ -93,7 +93,7 @@ class ProgressBar(t.Generic[V]):
         self.is_hidden = not isatty(self.file)
         self._last_line: t.Optional[str] = None
 
-    def __enter__(self) -> "ProgressBar":
+    def __enter__(self) -> "ProgressBar[V]":
         self.entered = True
         self.render_progress()
         return self
diff --git a/src/click/core.py b/src/click/core.py
index 5abfb0f..9aef380 100644
--- a/src/click/core.py
+++ b/src/click/core.py
@@ -1841,7 +1841,7 @@ class Group(MultiCommand):
         if self.command_class and kwargs.get("cls") is None:
             kwargs["cls"] = self.command_class
 
-        func: t.Optional[t.Callable] = None
+        func: t.Optional[t.Callable[..., t.Any]] = None
 
         if args and callable(args[0]):
             assert (
@@ -1889,7 +1889,7 @@ class Group(MultiCommand):
         """
         from .decorators import group
 
-        func: t.Optional[t.Callable] = None
+        func: t.Optional[t.Callable[..., t.Any]] = None
 
         if args and callable(args[0]):
             assert (
@@ -2260,7 +2260,7 @@ class Parameter:
         if value is None:
             return () if self.multiple or self.nargs == -1 else None
 
-        def check_iter(value: t.Any) -> t.Iterator:
+        def check_iter(value: t.Any) -> t.Iterator[t.Any]:
             try:
                 return _check_iter(value)
             except TypeError:
@@ -2277,12 +2277,12 @@ class Parameter:
             )
         elif self.nargs == -1:
 
-            def convert(value: t.Any) -> t.Tuple:
+            def convert(value: t.Any) -> t.Tuple[t.Any, ...]:
                 return tuple(self.type(x, self, ctx) for x in check_iter(value))
 
         else:  # nargs > 1
 
-            def convert(value: t.Any) -> t.Tuple:
+            def convert(value: t.Any) -> t.Tuple[t.Any, ...]:
                 value = tuple(check_iter(value))
 
                 if len(value) != self.nargs:
diff --git a/src/click/decorators.py b/src/click/decorators.py
index 28618dc..4f7ecbb 100644
--- a/src/click/decorators.py
+++ b/src/click/decorators.py
@@ -41,7 +41,7 @@ def pass_obj(f: F) -> F:
 
 
 def make_pass_decorator(
-    object_type: t.Type, ensure: bool = False
+    object_type: t.Type[t.Any], ensure: bool = False
 ) -> "t.Callable[[F], F]":
     """Given an object type this creates a decorator that will work
     similar to :func:`pass_obj` but instead of passing the object of the
diff --git a/src/click/exceptions.py b/src/click/exceptions.py
index 9e20b3e..59b18c6 100644
--- a/src/click/exceptions.py
+++ b/src/click/exceptions.py
@@ -36,7 +36,7 @@ class ClickException(Exception):
     def __str__(self) -> str:
         return self.message
 
-    def show(self, file: t.Optional[t.IO] = None) -> None:
+    def show(self, file: t.Optional[t.IO[t.Any]] = None) -> None:
         if file is None:
             file = get_text_stderr()
 
@@ -59,7 +59,7 @@ class UsageError(ClickException):
         self.ctx = ctx
         self.cmd = self.ctx.command if self.ctx else None
 
-    def show(self, file: t.Optional[t.IO] = None) -> None:
+    def show(self, file: t.Optional[t.IO[t.Any]] = None) -> None:
         if file is None:
             file = get_text_stderr()
         color = None
diff --git a/src/click/testing.py b/src/click/testing.py
index 244d326..7b6dd7f 100644
--- a/src/click/testing.py
+++ b/src/click/testing.py
@@ -79,11 +79,11 @@ class _NamedTextIOWrapper(io.TextIOWrapper):
 
 
 def make_input_stream(
-    input: t.Optional[t.Union[str, bytes, t.IO]], charset: str
+    input: t.Optional[t.Union[str, bytes, t.IO[t.Any]]], charset: str
 ) -> t.BinaryIO:
     # Is already an input stream.
     if hasattr(input, "read"):
-        rv = _find_binary_reader(t.cast(t.IO, input))
+        rv = _find_binary_reader(t.cast(t.IO[t.Any], input))
 
         if rv is not None:
             return rv
@@ -206,7 +206,7 @@ class CliRunner:
     @contextlib.contextmanager
     def isolation(
         self,
-        input: t.Optional[t.Union[str, bytes, t.IO]] = None,
+        input: t.Optional[t.Union[str, bytes, t.IO[t.Any]]] = None,
         env: t.Optional[t.Mapping[str, t.Optional[str]]] = None,
         color: bool = False,
     ) -> t.Iterator[t.Tuple[io.BytesIO, t.Optional[io.BytesIO]]]:
@@ -301,7 +301,7 @@ class CliRunner:
         default_color = color
 
         def should_strip_ansi(
-            stream: t.Optional[t.IO] = None, color: t.Optional[bool] = None
+            stream: t.Optional[t.IO[t.Any]] = None, color: t.Optional[bool] = None
         ) -> bool:
             if color is None:
                 return not default_color
@@ -350,7 +350,7 @@ class CliRunner:
         self,
         cli: "BaseCommand",
         args: t.Optional[t.Union[str, t.Sequence[str]]] = None,
-        input: t.Optional[t.Union[str, bytes, t.IO]] = None,
+        input: t.Optional[t.Union[str, bytes, t.IO[t.Any]]] = None,
         env: t.Optional[t.Mapping[str, t.Optional[str]]] = None,
         catch_exceptions: bool = True,
         color: bool = False,
@@ -449,7 +449,7 @@ class CliRunner:
 
     @contextlib.contextmanager
     def isolated_filesystem(
-        self, temp_dir: t.Optional[t.Union[str, os.PathLike]] = None
+        self, temp_dir: t.Optional[t.Union[str, "os.PathLike[str]"]] = None
     ) -> t.Iterator[str]:
         """A context manager that creates a temporary directory and
         changes the current working directory to it. This isolates tests
diff --git a/src/click/types.py b/src/click/types.py
index d948c70..1b04e37 100644
--- a/src/click/types.py
+++ b/src/click/types.py
@@ -397,7 +397,7 @@ class DateTime(ParamType):
 
 
 class _NumberParamTypeBase(ParamType):
-    _number_class: t.ClassVar[t.Type]
+    _number_class: t.ClassVar[t.Type[t.Any]]
 
     def convert(
         self, value: t.Any, param: t.Optional["Parameter"], ctx: t.Optional["Context"]
@@ -702,8 +702,8 @@ class File(ParamType):
             lazy = self.resolve_lazy_flag(value)
 
             if lazy:
-                f: t.IO = t.cast(
-                    t.IO,
+                f: t.IO[t.Any] = t.cast(
+                    t.IO[t.Any],
                     LazyFile(
                         value, self.mode, self.encoding, self.errors, atomic=self.atomic
                     ),
@@ -794,7 +794,7 @@ class Path(ParamType):
         readable: bool = True,
         resolve_path: bool = False,
         allow_dash: bool = False,
-        path_type: t.Optional[t.Type] = None,
+        path_type: t.Optional[t.Type[t.Any]] = None,
         executable: bool = False,
     ):
         self.exists = exists
@@ -944,7 +944,7 @@ class Tuple(CompositeParamType):
     :param types: a list of types that should be used for the tuple items.
     """
 
-    def __init__(self, types: t.Sequence[t.Union[t.Type, ParamType]]) -> None:
+    def __init__(self, types: t.Sequence[t.Union[t.Type[t.Any], ParamType]]) -> None:
         self.types = [convert_type(ty) for ty in types]
 
     def to_info_dict(self) -> t.Dict[str, t.Any]:
diff --git a/src/click/utils.py b/src/click/utils.py
index 8283788..fca3eba 100644
--- a/src/click/utils.py
+++ b/src/click/utils.py
@@ -120,7 +120,7 @@ class LazyFile:
         self.encoding = encoding
         self.errors = errors
         self.atomic = atomic
-        self._f: t.Optional[t.IO]
+        self._f: t.Optional[t.IO[t.Any]]
 
         if filename == "-":
             self._f, self.should_close = open_stream(filename, mode, encoding, errors)
@@ -141,7 +141,7 @@ class LazyFile:
             return repr(self._f)
         return f"<unopened file '{self.name}' {self.mode}>"
 
-    def open(self) -> t.IO:
+    def open(self) -> t.IO[t.Any]:
         """Opens the file if it's not yet open.  This call might fail with
         a :exc:`FileError`.  Not handling this error will produce an error
         that Click shows.
@@ -183,7 +183,7 @@ class LazyFile:
 
 
 class KeepOpenFile:
-    def __init__(self, file: t.IO) -> None:
+    def __init__(self, file: t.IO[t.Any]) -> None:
         self._file = file
 
     def __getattr__(self, name: str) -> t.Any:
@@ -340,7 +340,7 @@ def open_file(
     errors: t.Optional[str] = "strict",
     lazy: bool = False,
     atomic: bool = False,
-) -> t.IO:
+) -> t.IO[t.Any]:
     """Open a file, with extra behavior to handle ``'-'`` to indicate
     a standard stream, lazy open on write, and atomic write. Similar to
     the behavior of the :class:`~click.File` param type.
@@ -370,18 +370,20 @@ def open_file(
     .. versionadded:: 3.0
     """
     if lazy:
-        return t.cast(t.IO, LazyFile(filename, mode, encoding, errors, atomic=atomic))
+        return t.cast(
+            t.IO[t.Any], LazyFile(filename, mode, encoding, errors, atomic=atomic)
+        )
 
     f, should_close = open_stream(filename, mode, encoding, errors, atomic=atomic)
 
     if not should_close:
-        f = t.cast(t.IO, KeepOpenFile(f))
+        f = t.cast(t.IO[t.Any], KeepOpenFile(f))
 
     return f
 
 
 def format_filename(
-    filename: t.Union[str, bytes, os.PathLike], shorten: bool = False
+    filename: t.Union[str, bytes, "os.PathLike[t.AnyStr]"], shorten: bool = False
 ) -> str:
     """Formats a filename for user display.  The main purpose of this
     function is to ensure that the filename can be displayed at all.  This
@@ -458,7 +460,7 @@ class PacifyFlushWrapper:
     pipe, all calls and attributes are proxied.
     """
 
-    def __init__(self, wrapped: t.IO) -> None:
+    def __init__(self, wrapped: t.IO[t.Any]) -> None:
         self.wrapped = wrapped
 
     def flush(self) -> None: