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