Prepare to keep a record of which entity we're working on documenting
for the purposes of being able to change certain generative features
conditionally and create stronger assertions.

If you find yourself asking: "Wait, but where does the current entity
actually get recorded?!", you're right! That part comes with the
visit_entity() implementation, which gets added later.

This patch is front-loaded for the sake of type checking in the
forthcoming commits before visit_entity() is ready to be added.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 docs/sphinx/qapidoc.py | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/docs/sphinx/qapidoc.py b/docs/sphinx/qapidoc.py
index eaea19af7ac..834f12ba6e9 100644
--- a/docs/sphinx/qapidoc.py
+++ b/docs/sphinx/qapidoc.py
@@ -78,9 +78,15 @@
 
 class Transmogrifier:
     def __init__(self) -> None:
+        self._curr_ent: Optional[QAPISchemaDefinition] = None
         self._result = StringList()
         self.indent = 0
 
+    @property
+    def entity(self) -> QAPISchemaDefinition:
+        assert self._curr_ent is not None
+        return self._curr_ent
+
     # General-purpose rST generation functions
 
     def get_indent(self) -> str:
-- 
2.48.1