Extend existing _unwrap_descriptor() function

pdoc/__init__.py

@@ -19,9 +19,9 @@
 import typing
 from contextlib import contextmanager
 from copy import copy
-from functools import lru_cache, reduce, partial, wraps
+from functools import cached_property, lru_cache, reduce, partial, wraps
 from itertools import tee, groupby
-from types import ModuleType
+from types import FunctionType, ModuleType
 from typing import (  # noqa: F401
     cast, Any, Callable, Dict, Generator, Iterable, List, Literal, Mapping, NewType,
     Optional, Set, Tuple, Type, TypeVar, Union,
@@ -421,11 +421,21 @@ def _is_descriptor(obj):
             inspect.ismemberdescriptor(obj))
 
 
-def _unwrap_descriptor(obj):
+def _unwrap_descriptor(dobj):
+    obj = dobj.obj
     if isinstance(obj, property):
         return (getattr(obj, 'fget', False) or
                 getattr(obj, 'fset', False) or
                 getattr(obj, 'fdel', obj))
+    if isinstance(obj, cached_property):
+        return obj.func
+    if isinstance(obj, FunctionType):
+        return obj
+    if inspect.ismemberdescriptor(obj) or obj.__class__.__name__ == '_tuplegetter':
+        class_name = dobj.qualname.rsplit('.', 1)[0]
+        obj = getattr(dobj.module.obj, class_name)
+        return obj
+    # XXX: Follow descriptor protocol? Already proved buggy in conditions above
     return getattr(obj, '__get__', obj)
 
 
@@ -550,7 +560,7 @@ def source(self) -> str:
         available, an empty string.
         """
         try:
-            lines, _ = inspect.getsourcelines(_unwrap_descriptor(self.obj))
+            lines, _ = inspect.getsourcelines(_unwrap_descriptor(self))
         except (ValueError, TypeError, OSError):
             return ''
         return inspect.cleandoc(''.join(['\n'] + lines))
@@ -1402,7 +1412,7 @@ def return_annotation(self, *, link=None) -> str:
                 # global variables
                 lambda: _get_type_hints(not self.cls and self.module.obj)[self.name],
                 # properties
-                lambda: inspect.signature(_unwrap_descriptor(self.obj)).return_annotation,
+                lambda: inspect.signature(_unwrap_descriptor(self)).return_annotation,
                 # Use raw annotation strings in unmatched forward declarations
                 lambda: cast(Class, self.cls).obj.__annotations__[self.name],
                 # Extract annotation from the docstring for C builtin function

pdoc/html_helpers.py

@@ -8,7 +8,7 @@
 import textwrap
 import traceback
 from contextlib import contextmanager
-from functools import partial, lru_cache, cached_property
+from functools import partial, lru_cache
 from typing import Callable, Match, Optional
 from warnings import warn
 import xml.etree.ElementTree as etree
@@ -564,20 +564,7 @@ def format_git_link(template: str, dobj: pdoc.Doc):
     try:
         if 'commit' in _str_template_fields(template):
             commit = _git_head_commit()
-        obj = dobj.obj
-
-        # special handlers for properties, cached_properties, and tuples
-        if isinstance(obj, property):
-            obj = obj.fget
-        elif isinstance(obj, cached_property):
-            obj = obj.func
-        elif (
-            (hasattr(obj, '__class__') and obj.__class__.__name__ == '_tuplegetter')
-            or inspect.ismemberdescriptor(obj)
-        ):
-            class_name = dobj.qualname.rsplit('.', 1)[0]
-            obj = getattr(dobj.module.obj, class_name)
-
+        obj = pdoc._unwrap_descriptor(dobj)
         abs_path = inspect.getfile(inspect.unwrap(obj))
         path = _project_relative_path(abs_path)