qapi2texi: Fix up output around #optional

We use tag #optional to mark optional members, like this:

    # @name: #optional The name of the guest

texi_body() strips #optional, but not whitespace around it.  For the
above, we get in qemu-qmp-qapi.texi

    @item @code{'name'} (optional)
     The name of the guest
    @end table

The extra space can lead to artifacts in output, e.g in
qemu-qmp-ref.7.pod

    =item C<'name'> (optional)

     The name of the guest

and then in qemu-qmp-ref.7

    .IX Item "name (optional)"
    .Vb 1
    \& The name of the guest
    .Ve

instead of intended plain

    .IX Item "name (optional)"
    The name of the guest

Get rid of these artifacts by removing whitespace around #optional
along with it.

This turns three minus signs in qapi-schema.json into markup, because
they're now at the beginning of the line.  Drop them, they're unwanted
there.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <1489582656-31133-11-git-send-email-armbru@redhat.com>

2 files changed, 5 insertions, 4 deletions

diff --git a/qapi-schema.json b/qapi-schema.json
index 17c766ee3b..52141cd51e 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -3779,11 +3779,11 @@
 #
 # @dstport: #optional destination port - mandatory for udp, optional for ip
 #
-# @ipv6: #optional - force the use of ipv6
+# @ipv6: #optional force the use of ipv6
 #
-# @udp: #optional - use the udp version of l2tpv3 encapsulation
+# @udp: #optional use the udp version of l2tpv3 encapsulation
 #
-# @cookie64: #optional - use 64 bit coookies
+# @cookie64: #optional use 64 bit coookies
 #
 # @counter: #optional have sequence counter
 #
diff --git a/scripts/qapi2texi.py b/scripts/qapi2texi.py
index 06d6abfa5a..0f3e5738c8 100755
--- a/scripts/qapi2texi.py
+++ b/scripts/qapi2texi.py
@@ -137,7 +137,8 @@ def texi_body(doc):
             desc = str(section)
             opt = ''
             if "#optional" in desc:
-                desc = desc.replace("#optional", "")
+                desc = re.sub(r'^ *#optional *\n?|\n? *#optional *$|#optional',
+                              '', desc)
                 opt = ' (optional)'
             body += "@item @code{'%s'}%s\n%s\n" % (arg, opt,
                                                    texi_format(desc))