Add the new `py:deco` cross-reference role (#13292)

CHANGES.rst

@@ -98,6 +98,9 @@ Features added
   Patch by Bénédikt Tran and Adam Turner.
 * #13163: Always print the full context when Sphinx encounters an internal error.
   Patch by Kevin Deldycke and Adam Turner.
+* #13105: Introduce the :rst:role:`py:deco` role to cross-reference decorator
+  functions and methods in the Python domain.
+  Patch by Adam Turner.
 
 Bugs fixed
 ----------

doc/usage/domains/python.rst

@@ -562,8 +562,7 @@ The following directives are provided for module and class contents:
 
    (as opposed to ``.. py:decorator:: removename(func)``.)
 
-   There is no ``py:deco`` role to link to a decorator that is marked up with
-   this directive; rather, use the :rst:role:`py:func` role.
+   Refer to a decorator function using the :rst:role:`py:deco` role.
 
    .. rst:directive:option:: single-line-parameter-list
       :type: no value
@@ -589,7 +588,7 @@ The following directives are provided for module and class contents:
 
    Same as :rst:dir:`py:decorator`, but for decorators that are methods.
 
-   Refer to a decorator method using the :rst:role:`py:meth` role.
+   Refer to a decorator method using the :rst:role:`py:deco` role.
 
 .. _annotation expression: https://typing.readthedocs.io/en/latest/spec/annotations.html#type-and-annotation-expressions
 
@@ -769,6 +768,17 @@ a matching identifier is found:
    automatically by Sphinx if the :confval:`add_function_parentheses` config
    value is ``True`` (the default).
 
+.. rst:role:: py:deco
+
+   Reference a Python decorator; dotted names may be used.
+   The rendered output will be prepended with an at-sign (``@``),
+   for example: ``:py:deco:`removename``` produces :py:deco:`removename`.
+
+   .. py:decorator:: removename
+      :no-contents-entry:
+      :no-index-entry:
+      :no-typesetting:
+
 .. rst:role:: py:data
 
    Reference a module-level variable.

sphinx/domains/python/__init__.py

@@ -28,7 +28,7 @@ if TYPE_CHECKING:
     from collections.abc import Iterable, Iterator, Sequence, Set
     from typing import Any, ClassVar
 
-    from docutils.nodes import Element, Node
+    from docutils.nodes import Element, Node, TextElement
 
     from sphinx.addnodes import desc_signature, pending_xref
     from sphinx.application import Sphinx
@@ -592,6 +592,27 @@ class PyXRefRole(XRefRole):
         return title, target
 
 
+class _PyDecoXRefRole(PyXRefRole):
+    def __init__(
+        self,
+        fix_parens: bool = False,
+        lowercase: bool = False,
+        nodeclass: type[Element] | None = None,
+        innernodeclass: type[TextElement] | None = None,
+        warn_dangling: bool = False,
+    ) -> None:
+        super().__init__(
+            fix_parens=True,
+            lowercase=lowercase,
+            nodeclass=nodeclass,
+            innernodeclass=innernodeclass,
+            warn_dangling=warn_dangling,
+        )
+
+    def update_title_and_target(self, title: str, target: str) -> tuple[str, str]:
+        return f'@{title}', target
+
+
 def filter_meta_fields(
     app: Sphinx, domain: str, objtype: str, content: Element
 ) -> None:
@@ -748,6 +769,7 @@ class PythonDomain(Domain):
         'data': PyXRefRole(),
         'exc': PyXRefRole(),
         'func': PyXRefRole(fix_parens=True),
+        'deco': _PyDecoXRefRole(),
         'class': PyXRefRole(),
         'const': PyXRefRole(),
         'attr': PyXRefRole(),