[PATCH 01/27] docs/sphinx: create QAPI domain extension stub

[John Snow <jsnow@redhat.com>]

It doesn't really do anything yet, we'll get to it brick-by-brick in the
forthcoming commits to keep the series breezy and the git history
informative.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 docs/conf.py               |  3 ++-
 docs/sphinx/qapi-domain.py | 50 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 52 insertions(+), 1 deletion(-)
 create mode 100644 docs/sphinx/qapi-domain.py

diff --git a/docs/conf.py b/docs/conf.py
index aae0304ac6e..b15665d956d 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -61,7 +61,8 @@
 # Add any Sphinx extension module names here, as strings. They can be
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
-extensions = ['kerneldoc', 'qmp_lexer', 'hxtool', 'depfile', 'qapidoc']
+extensions = ['kerneldoc', 'hxtool', 'depfile',
+              'qapidoc', 'qapi-domain', 'qmp_lexer']
 
 if sphinx.version_info[:3] > (4, 0, 0):
     tags.add('sphinx4')
diff --git a/docs/sphinx/qapi-domain.py b/docs/sphinx/qapi-domain.py
new file mode 100644
index 00000000000..163b9ff21c3
--- /dev/null
+++ b/docs/sphinx/qapi-domain.py
@@ -0,0 +1,50 @@
+"""
+QAPI domain extension.
+"""
+
+from __future__ import annotations
+
+from typing import (
+    TYPE_CHECKING,
+    Any,
+    Dict,
+    List,
+    Tuple,
+)
+
+from sphinx.domains import Domain, ObjType
+from sphinx.util import logging
+
+
+if TYPE_CHECKING:
+    from sphinx.application import Sphinx
+
+logger = logging.getLogger(__name__)
+
+
+class QAPIDomain(Domain):
+    """QAPI language domain."""
+
+    name = "qapi"
+    label = "QAPI"
+
+    object_types: Dict[str, ObjType] = {}
+    directives = {}
+    roles = {}
+    initial_data: Dict[str, Dict[str, Tuple[Any]]] = {}
+    indices = []
+
+    def merge_domaindata(self, docnames: List[str], otherdata: Dict[str, Any]) -> None:
+        pass
+
+
+def setup(app: Sphinx) -> Dict[str, Any]:
+    app.setup_extension("sphinx.directives")
+    app.add_domain(QAPIDomain)
+
+    return {
+        "version": "1.0",
+        "env_version": 1,
+        "parallel_read_safe": True,
+        "parallel_write_safe": True,
+    }
-- 
2.44.0