qapi: add 'If:' condition to struct members documentation

Signed-off-by: NMarc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20181213123724.4866-20-marcandre.lureau@redhat.com>
Reviewed-by: NMarkus Armbruster <armbru@redhat.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>

scripts/qapi/doc.py

@@ -143,10 +143,10 @@ def texi_member(member, desc, suffix):
     """Format a table of members item for an object type member"""
     typ = member.type.doc_type()
     membertype = ': ' + typ if typ else ''
-    return '@item @code{%s%s}%s%s\n%s' % (
+    return '@item @code{%s%s}%s%s\n%s%s' % (
         member.name, membertype,
         ' (optional)' if member.optional else '',
-        suffix, desc)
+        suffix, desc, texi_if(member.ifcond, prefix='@*'))
 
 
 def texi_members(doc, what, base, variants, member_func):

tests/qapi-schema/doc-good.json

@@ -72,7 +72,8 @@
 #
 # Another paragraph (but no @var: line)
 ##
-{ 'struct': 'Variant1', 'data': { 'var1': 'str' } }
+{ 'struct': 'Variant1',
+  'data': { 'var1': { 'type': 'str', 'if': 'defined(IFSTR)' } } }
 
 ##
 # @Variant2:

tests/qapi-schema/doc-good.out

@@ -18,6 +18,7 @@ object Base
     member base1: Enum optional=False
 object Variant1
     member var1: str optional=False
+        if ['defined(IFSTR)']
 object Variant2
 object Object
     base Base

tests/qapi-schema/doc-good.texi

@@ -119,6 +119,7 @@ Another paragraph (but no @code{var}: line)
 @table @asis
 @item @code{var1: string}
 Not documented
+@*@b{If:} @code{defined(IFSTR)}
 @end table
 
 @end deftp