This patch begins distinguishing "Plain" sections as being either
"Intro" or "Details" sections for the purpose of knowing when/where/how
to inline those sections.

The Intro section is always the first section of any doc block. It may
be empty or any number of paragraphs. It is interrupted by any other
non-plaintext section, i.e.; Members, Features, Errors, Returns, Since,
and TODO.

The details section, when present, is either the last section or the
second-to-last section when a "Since:" section is present. It consists
of any plain text in the doc block that follows any named sections if
present.

Signed-off-by: John Snow <[email protected]>
---
 docs/sphinx/qapidoc.py         |  2 +-
 scripts/qapi/parser.py         | 35 +++++++++++++++++++++++-----------
 tests/qapi-schema/doc-good.out |  8 ++++----
 3 files changed, 29 insertions(+), 16 deletions(-)

diff --git a/docs/sphinx/qapidoc.py b/docs/sphinx/qapidoc.py
index c2f09bac16c..e359836f110 100644
--- a/docs/sphinx/qapidoc.py
+++ b/docs/sphinx/qapidoc.py
@@ -368,7 +368,7 @@ def visit_sections(self, ent: QAPISchemaDefinition) -> None:
         for i, section in enumerate(sections):
             section.text = self.reformat_arobase(section.text)
 
-            if section.kind == QAPIDoc.Kind.PLAIN:
+            if section.kind.name in ("INTRO", "DETAILS"):
                 self.visit_paragraph(section)
             elif section.kind == QAPIDoc.Kind.MEMBER:
                 assert isinstance(section, QAPIDoc.ArgSection)
diff --git a/scripts/qapi/parser.py b/scripts/qapi/parser.py
index c3cf33904ef..da0ac32ad89 100644
--- a/scripts/qapi/parser.py
+++ b/scripts/qapi/parser.py
@@ -544,7 +544,7 @@ def get_doc(self) -> 'QAPIDoc':
             doc = QAPIDoc(info, symbol)
             self.accept(False)
             line = self.get_doc_line()
-            no_more_args = False
+            have_tagged = False
 
             while line is not None:
                 # Blank lines
@@ -573,10 +573,10 @@ def get_doc(self) -> 'QAPIDoc':
                     if not doc.features:
                         raise QAPIParseError(
                             self, 'feature descriptions expected')
-                    no_more_args = True
+                    have_tagged = True
                 elif match := self._match_at_name_colon(line):
                     # description
-                    if no_more_args:
+                    if have_tagged:
                         raise QAPIParseError(
                             self,
                             "description of '@%s:' follows a section"
@@ -588,7 +588,7 @@ def get_doc(self) -> 'QAPIDoc':
                         if text:
                             doc.append_line(text)
                         line = self.get_doc_indented(doc)
-                    no_more_args = True
+                    have_tagged = True
                 elif match := re.match(
                         r'(Returns|Errors|Since|Notes?|Examples?|TODO)'
                         r'(?!::): *',
@@ -629,10 +629,14 @@ def get_doc(self) -> 'QAPIDoc':
                     if text:
                         doc.append_line(text)
                     line = self.get_doc_indented(doc)
-                    no_more_args = True
+                    have_tagged = True
                 else:
                     # plain paragraph
-                    doc.ensure_untagged_section(self.info)
+
+                    # Paragraphs before tagged sections are "intro" paragraphs.
+                    # Any appearing after are "detail" paragraphs.
+                    intro = not have_tagged
+                    doc.ensure_untagged_section(self.info, intro)
                     doc.append_line(line)
                     line = self.get_doc_paragraph(doc)
         else:
@@ -674,13 +678,14 @@ class QAPIDoc:
     """
 
     class Kind(enum.Enum):
-        PLAIN = 0
+        INTRO = 0
         MEMBER = 1
         FEATURE = 2
         RETURNS = 3
         ERRORS = 4
         SINCE = 5
         TODO = 6
+        DETAILS = 7
 
         @staticmethod
         def from_string(kind: str) -> 'QAPIDoc.Kind':
@@ -730,7 +735,7 @@ def __init__(self, info: QAPISourceInfo, symbol: 
Optional[str] = None):
         self.symbol: Optional[str] = symbol
         # the sections in textual order
         self.all_sections: List[QAPIDoc.Section] = [
-            QAPIDoc.Section(info, QAPIDoc.Kind.PLAIN)
+            QAPIDoc.Section(info, QAPIDoc.Kind.INTRO)
         ]
         # the body section
         self.body: Optional[QAPIDoc.Section] = self.all_sections[0]
@@ -748,12 +753,20 @@ def __init__(self, info: QAPISourceInfo, symbol: 
Optional[str] = None):
     def end(self) -> None:
         for section in self.all_sections:
             section.text = section.text.strip('\n')
-            if section.kind != QAPIDoc.Kind.PLAIN and section.text == '':
+            if (
+                    section.kind not in (
+                        QAPIDoc.Kind.INTRO, QAPIDoc.Kind.DETAILS
+                    ) and section.text == ''
+            ):
                 raise QAPISemError(
                     section.info, "text required after '%s:'" % section.kind)
 
-    def ensure_untagged_section(self, info: QAPISourceInfo) -> None:
-        kind = QAPIDoc.Kind.PLAIN
+    def ensure_untagged_section(
+        self,
+        info: QAPISourceInfo,
+        intro: bool = True,
+    ) -> None:
+        kind = QAPIDoc.Kind.INTRO if intro else QAPIDoc.Kind.DETAILS
 
         if self.all_sections and self.all_sections[-1].kind == kind:
             # extend current section
diff --git a/tests/qapi-schema/doc-good.out b/tests/qapi-schema/doc-good.out
index 04a55072646..04e29e8d50f 100644
--- a/tests/qapi-schema/doc-good.out
+++ b/tests/qapi-schema/doc-good.out
@@ -116,7 +116,7 @@ The _one_ {and only}, description on the same line
 Also _one_ {and only}
     feature=enum-member-feat
 a member feature
-    section=Plain
+    section=Details
 @two is undocumented
 doc symbol=Base
     body=
@@ -175,7 +175,7 @@ description starts on the same line
 a feature
     feature=cmd-feat2
 another feature
-    section=Plain
+    section=Details
 .. note:: @arg3 is undocumented
     section=Returns
 @Object
@@ -183,7 +183,7 @@ another feature
 some
     section=Todo
 frobnicate
-    section=Plain
+    section=Details
 .. admonition:: Notes
 
  - Lorem ipsum dolor sit amet
@@ -216,7 +216,7 @@ If you're bored enough to read this, go see a video of 
boxed cats
 a feature
     feature=cmd-feat2
 another feature
-    section=Plain
+    section=Details
 .. qmp-example::
 
    -> "this example"
-- 
2.53.0


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