Started work on GTK+/GLib module

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Hello!

As promised I started working in a thin GTK+ and GLib
wrapper module for Lua. I finally decided to wrap GLib=20
as well as GTK+/GDK, because it contains some useful
functionality that is not present at the moment in
Lua/LuaCheia. There are several possible approaches=20
for the binding:

  A. Separate modules for each of GLib, GDK and GTK+

  B. A module for GLib and another with GTK+ and GDK
     (usually there's no point in using GDK outside of=20
     GTK+, but GLib alone might be useful).

  C. An all-in-one module containing the three libs.

  D. Suggestions?

I have started the work as an all-in-one module, but it
might be changed easily if needed/wanted.

Another issue: I tried using tolua to make the binding,
but for some reason the generated code does not like the
GTK+ object system. The most annoying issue I have found
is that upcasting objects (i.e: casting a GtkWindow into=20
a GtkWidget) makes tolua believe that the casted object
effectively changed its type! (so you can't pass the
GtkWindow to a function that expects a GtkWindow unless
you re-cast the object into a GtkWindow). This constant
cast-up and cast-down would make Lua code look like a
rollercoaster track, so I decided to make a hand-written
binding.=20

(Q: Does anyone know wether SWIG would work with Lua5?)

Note that I have commited preliminary, proof-of-concept
code, to the CVS. I like to make code available to the
public soon ;). GTK won't work at this stage (mostly
because you can't call gtk_init yet), but some GLib=20
stuff is working. Just compile as usual and tap into=20
your LuaCheia interpreter:

   =3D cheia.load "gtk"  -- should return 'true'
   for i,v in glib do print(i, v) end
   for i,v in gtk  do print(i, v) end

   =3D glib.str_has_suffix("foobar", "bar")  -- returns true
   =3D glib.get_tmp_dir()  -- returns '/tmp' or similar

The mapping of functions is straightforward, so:
  * in GLib: g_do_something becomes glib.do_something
  * in GTK+: gtk_do_something becomes gtk.do_something=20
  * ...and so on

Enjoy, and give feedback if you feel that something should
be changed.
--
Adrian Perez
moebius _at_ eml.cc

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