[Tracker] libtracker-sparql & gobject-introspection

[Ivan Frade <ivan frade gmail com>]

Hi,

 I have been trying to enable gobject-introspection in our libraries,
starting with libtracker-sparql. It is not so easy as it looks. I got
stuck and some help would be appreciated.

 The theory is easy:
#1 generate a .gir file describing the UI from the source code
#2 compile the .gir into a .typelib with g-ir-compiler
#3 put everything in the right locations

 I tried two options:

Option 1: Using the valac --gir options (so valac generates the gir).
It spits some errors in the generation, but it generates a .gir. That
gir doesn't compile into typelib. The problem seems to be with a
va_list parameter:

$ /opt/gnome/bin/g-ir-compiler --shared-library=tracker-sparql-0.10 -o
TrackerSparql-1.0.typelib TrackerSparql-1.0.gir
 ...
 TrackerSparql-1.0.gir:-1: In sparql_escape_uri_vprintf.args.: error:
type reference 'va_list' not found

 I read multiple times the .gir, i checked the .gir of other libraries
using va_list parameters and i cannot see any difference.

Option 2: I tried to build the .gir from the .c files generated from
vala, using the standard procedure documented in
gobject-introspection. Things got a bit better here: .gir is
generated, .typelib is compiled and i can even load if from python.
But the content is mostly useless.

 There is a class in the .gir:
        <class name="SparqlConnection" c:type="TrackerSparqlConnection"
glib:type-name="TrackerSparqlConnection"
glib:get-type="tracker_sparql_connection_get_type"
glib:type-struct="ConnectionClass" parent="GObject.Object"
abstract="1">

 But it is not visible in python (other classes in the gir are
available). Could this be a problem in the compiler? in valac
generating the gir?

 Some help is welcome. I pushed my experiment in the g-i branch in the
repository.

 Regards,

Ivan