[PATCH 18/23] docs/qapidoc: add visit_returns() method

[John Snow]

Generates :returns: fields for explicit returns statements. Note that
this does not presently handle undocumented returns, which is handled in
a later commit.

Signed-off-by: John Snow <jsnow@redhat.com>
---
 docs/sphinx/qapidoc.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/docs/sphinx/qapidoc.py b/docs/sphinx/qapidoc.py
index c731c597daf..9d298117fea 100644
--- a/docs/sphinx/qapidoc.py
+++ b/docs/sphinx/qapidoc.py
@@ -41,6 +41,7 @@
 from qapi.schema import (
     QAPISchema,
     QAPISchemaArrayType,
+    QAPISchemaCommand,
     QAPISchemaEntity,
     QAPISchemaEnumMember,
     QAPISchemaFeature,
@@ -202,6 +203,19 @@ def visit_feature(self, section: QAPIDoc.ArgSection) -> 
None:
 
         self.generate_field("feat", section.member, section.text, section.info)
 
+    def visit_returns(self, section: QAPIDoc.Section) -> None:
+        assert isinstance(self.entity, QAPISchemaCommand)
+        rtype = self.entity.ret_type
+        # q_empty can produce None, but we won't be documenting anything
+        # without an explicit return statement in the doc block, and we
+        # should not have any such explicit statements when there is no
+        # return value.
+        assert rtype
+
+        typ = self.format_type(rtype)
+        assert section.text  # We don't expect empty returns sections.
+        self.add_field("returns", typ, section.text, section.info)
+
     def visit_errors(self, section: QAPIDoc.Section) -> None:
         # FIXME: the formatting for errors may be inconsistent and may
         # or may not require different newline placement to ensure
-- 
2.47.0