docs/devel/qapi-code-gen: Belatedly document feature documentation

Commit 6a8c0b5102 "qapi: Add feature flags to struct types" neglected
to document how to document feature flags.  Make up for that.

Cc: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20211026111023.76937-3-armbru@redhat.com>
[Editing accident fixed]
This commit is contained in:
Markus Armbruster 2021-10-26 13:10:23 +02:00
parent 13b86cbd2c
commit 53e9e547d2

View File

@ -956,15 +956,16 @@ definition must have documentation.
Definition documentation starts with a line naming the definition,
followed by an optional overview, a description of each argument (for
commands and events), member (for structs and unions), branch (for
alternates), or value (for enums), and finally optional tagged
sections.
alternates), or value (for enums), a description of each feature (if
any), and finally optional tagged sections.
Descriptions of arguments can span multiple lines. The description
text can start on the line following the '\@argname:', in which case it
must not be indented at all. It can also start on the same line as
the '\@argname:'. In this case if it spans multiple lines then second
and subsequent lines must be indented to line up with the first
character of the first line of the description::
The description of an argument or feature 'name' starts with
'\@name:'. The description text can start on the line following the
'\@name:', in which case it must not be indented at all. It can also
start on the same line as the '\@name:'. In this case if it spans
multiple lines then second and subsequent lines must be indented to
line up with the first character of the first line of the
description::
# @argone:
# This is a two line description
@ -986,6 +987,12 @@ The number of spaces between the ':' and the text is not significant.
Extensions added after the definition was first released carry a
'(since x.y.z)' comment.
The feature descriptions must be preceded by a line "Features:", like
this::
# Features:
# @feature: Description text
A tagged section starts with one of the following words:
"Note:"/"Notes:", "Since:", "Example"/"Examples", "Returns:", "TODO:".
The section ends with the start of a new section.