docs/qapi-domain: add :unstable: directive option

Although "unstable" is a feature (and *will* appear in the features
list), add a special :unstable: option to generate an eye-catch that
makes this information very hard to miss.

The forthcoming Transmogrifier in qapidoc.py will add this option
whenever it detects that the features list attached to a definition
contains the "unstable" entry.

Signed-off-by: Harmonie Snow <harmonie@gmail.com>
Signed-off-by: John Snow <jsnow@redhat.com>
Message-ID: <20250311034303.75779-25-jsnow@redhat.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/docs/sphinx/qapi_domain.py b/docs/sphinx/qapi_domain.py
index b672ae6c50..00fd11ebf7 100644
--- a/docs/sphinx/qapi_domain.py
+++ b/docs/sphinx/qapi_domain.py
@@ -218,6 +218,7 @@ class QAPIObject(QAPIDescription):
             # These are QAPI originals:
             "since": directives.unchanged,
             "deprecated": directives.flag,
+            "unstable": directives.flag,
         }
     )
 
@@ -300,6 +301,13 @@ class QAPIObject(QAPIDescription):
                 "qapi-deprecated",
             )
 
+        if "unstable" in self.options:
+            _add_pip(
+                ":unstable:",
+                f"This {self.objtype} is unstable/experimental.",
+                "qapi-unstable",
+            )
+
         if infopips.children:
             contentnode.insert(0, infopips)