Close #8107: autodoc: Add class-doc-from option to autoclass directive

Add `class-doc-from` option to the `autoclass` directive to control
the content of the specific class.  It takes `class`, `init`, and `both`
like `autoclass_content`.

CHANGES

@@ -13,6 +13,9 @@ Deprecated
 Features added
 --------------
 
+* #8107: autodoc: Add ``class-doc-from`` option to :rst:dir:`autoclass`
+  directive to control the content of the specific class like
+  :confval:`autoclass_content`
 * #9129: html search: Show search summaries when html_copy_source = False
 * #9097: Optimize the paralell build
 

doc/usage/extensions/autodoc.rst

@@ -343,6 +343,10 @@ inserting them into the page source under a suitable :rst:dir:`py:module`,
 
         .. autoclass:: module.name::Noodle
 
+   * :rst:dir:`autoclass` also recognizes the ``class-doc-from`` option that
+     can be used to override the global value of :confval:`autoclass_content`.
+
+     .. versionadded:: 4.1
 
 .. rst:directive:: autofunction
                    autodecorator
@@ -507,7 +511,7 @@ There are also config values that you can set:
    The supported options are ``'members'``, ``'member-order'``,
    ``'undoc-members'``, ``'private-members'``, ``'special-members'``,
    ``'inherited-members'``, ``'show-inheritance'``, ``'ignore-module-all'``,
-   ``'imported-members'`` and ``'exclude-members'``.
+   ``'imported-members'``, ``'exclude-members'`` and ``'class-doc-from'``.
 
    .. versionadded:: 1.8
 
@@ -517,6 +521,9 @@ There are also config values that you can set:
    .. versionchanged:: 2.1
       Added ``'imported-members'``.
 
+   .. versionchanged:: 4.1
+      Added ``'class-doc-from'``.
+
 .. confval:: autodoc_docstring_signature
 
    Functions imported from C modules cannot be introspected, and therefore the

sphinx/ext/autodoc/__init__.py

@@ -129,6 +129,14 @@ def member_order_option(arg: Any) -> Optional[str]:
         raise ValueError(__('invalid value for member-order option: %s') % arg)
 
 
+def class_doc_from_option(arg: Any) -> Optional[str]:
+    """Used to convert the :class-doc-from: option to autoclass directives."""
+    if arg in ('both', 'class', 'init'):
+        return arg
+    else:
+        raise ValueError(__('invalid value for class-doc-from option: %s') % arg)
+
+
 SUPPRESS = object()
 
 
@@ -1417,6 +1425,7 @@ class ClassDocumenter(DocstringSignatureMixin, ModuleLevelDocumenter):  # type:
         'show-inheritance': bool_option, 'member-order': member_order_option,
         'exclude-members': exclude_members_option,
         'private-members': members_option, 'special-members': members_option,
+        'class-doc-from': class_doc_from_option,
     }
 
     _signature_class: Any = None
@@ -1651,7 +1660,7 @@ class ClassDocumenter(DocstringSignatureMixin, ModuleLevelDocumenter):  # type:
         if lines is not None:
             return lines
 
-        content = self.config.autoclass_content
+        classdoc_from = self.options.get('class-doc-from', self.config.autoclass_content)
 
         docstrings = []
         attrdocstring = self.get_attr(self.object, '__doc__', None)
@@ -1660,7 +1669,7 @@ class ClassDocumenter(DocstringSignatureMixin, ModuleLevelDocumenter):  # type:
 
         # for classes, what the "docstring" is can be controlled via a
         # config value; the default is only the class docstring
-        if content in ('both', 'init'):
+        if classdoc_from in ('both', 'init'):
             __init__ = self.get_attr(self.object, '__init__', None)
             initdocstring = getdoc(__init__, self.get_attr,
                                    self.config.autodoc_inherit_docstrings,
@@ -1682,7 +1691,7 @@ class ClassDocumenter(DocstringSignatureMixin, ModuleLevelDocumenter):  # type:
                      initdocstring.strip() == object.__new__.__doc__)):  # for !pypy
                     initdocstring = None
             if initdocstring:
-                if content == 'init':
+                if classdoc_from == 'init':
                     docstrings = [initdocstring]
                 else:
                     docstrings.append(initdocstring)

sphinx/ext/autodoc/directive.py

@@ -30,7 +30,7 @@ logger = logging.getLogger(__name__)
 AUTODOC_DEFAULT_OPTIONS = ['members', 'undoc-members', 'inherited-members',
                            'show-inheritance', 'private-members', 'special-members',
                            'ignore-module-all', 'exclude-members', 'member-order',
-                           'imported-members']
+                           'imported-members', 'class-doc-from']
 
 AUTODOC_EXTENDABLE_OPTIONS = ['members', 'private-members', 'special-members',
                               'exclude-members']

tests/test_ext_autodoc_autoclass.py

@@ -264,6 +264,53 @@ def test_show_inheritance_for_subclass_of_generic_type(app):
     ]
 
 
+@pytest.mark.sphinx('html', testroot='ext-autodoc')
+def test_class_doc_from_class(app):
+    options = {"members": None,
+               "class-doc-from": "class"}
+    actual = do_autodoc(app, 'class', 'target.autoclass_content.C', options)
+    assert list(actual) == [
+        '',
+        '.. py:class:: C()',
+        '   :module: target.autoclass_content',
+        '',
+        '   A class having __init__, no __new__',
+        '',
+    ]
+
+
+@pytest.mark.sphinx('html', testroot='ext-autodoc')
+def test_class_doc_from_init(app):
+    options = {"members": None,
+               "class-doc-from": "init"}
+    actual = do_autodoc(app, 'class', 'target.autoclass_content.C', options)
+    assert list(actual) == [
+        '',
+        '.. py:class:: C()',
+        '   :module: target.autoclass_content',
+        '',
+        '   __init__ docstring',
+        '',
+    ]
+
+
+@pytest.mark.sphinx('html', testroot='ext-autodoc')
+def test_class_doc_from_both(app):
+    options = {"members": None,
+               "class-doc-from": "both"}
+    actual = do_autodoc(app, 'class', 'target.autoclass_content.C', options)
+    assert list(actual) == [
+        '',
+        '.. py:class:: C()',
+        '   :module: target.autoclass_content',
+        '',
+        '   A class having __init__, no __new__',
+        '',
+        '   __init__ docstring',
+        '',
+    ]
+
+
 def test_class_alias(app):
     def autodoc_process_docstring(*args):
         """A handler always raises an error.