This adds special rendering for Sphinx's typed field lists.

This patch does not add any QAPI-aware markup, rendering, or
cross-referencing for the type names, yet. That feature requires a
subclass to TypedField which will happen in its own commit quite a bit
later in this series; after all the basic fields and objects have been
established first.

The syntax for this field is:

:arg type name: description
   description cont'd

You can omit the type or the description, but you cannot omit the name
-- if you do so, it degenerates into a "normal field list" entry, and
probably isn't what you want.

Signed-off-by: John Snow <js...@redhat.com>
---
 docs/qapi/index.rst        | 15 +++++++++++++++
 docs/sphinx/qapi-domain.py | 14 ++++++++++++--
 2 files changed, 27 insertions(+), 2 deletions(-)

diff --git a/docs/qapi/index.rst b/docs/qapi/index.rst
index 33b9349a3ee..197587bbc81 100644
--- a/docs/qapi/index.rst
+++ b/docs/qapi/index.rst
@@ -86,3 +86,18 @@ Explicit cross-referencing syntax for QAPI modules is 
available with
    * ``:no-index-entry:`` or ``:noindexentry:``
    * ``:no-contents-entry:`` or ``:nocontentsentry:``
    * ``:no-typesetting:``
+
+.. qapi:command:: fake-command
+   :since: 13.37
+
+   This is a fake command, it's not real. It can't hurt you.
+
+   :arg int foo: normal parameter documentation.
+   :arg str bar: Another normal parameter description.
+   :arg baz: Missing a type.
+   :arg no-descr:
+
+   Field lists can appear anywhere in the directive block, but any field
+   list entries in the same list block that are recognized as special
+   ("arg") will be reformatted and grouped accordingly for rendered
+   output.
diff --git a/docs/sphinx/qapi-domain.py b/docs/sphinx/qapi-domain.py
index 38a50318d08..853bd91b7a8 100644
--- a/docs/sphinx/qapi-domain.py
+++ b/docs/sphinx/qapi-domain.py
@@ -33,6 +33,7 @@
 from sphinx.locale import _, __
 from sphinx.roles import XRefRole
 from sphinx.util import logging
+from sphinx.util.docfields import TypedField
 from sphinx.util.docutils import SphinxDirective, switch_source_input
 from sphinx.util.nodes import (
     make_id,
@@ -254,8 +255,17 @@ def _toc_entry_name(self, sig_node: desc_signature) -> str:
 class QAPICommand(QAPIObject):
     """Description of a QAPI Command."""
 
-    # Nothing unique for now! Changed in later commits O:-)
-    pass
+    doc_field_types = QAPIObject.doc_field_types.copy()
+    doc_field_types.extend(
+        [
+            TypedField(
+                "argument",
+                label=_("Arguments"),
+                names=("arg",),
+                can_collapse=True,
+            ),
+        ]
+    )
 
 
 class QAPIModule(SphinxDirective):
-- 
2.44.0


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