Re: [Vala] Fwd: Questions about vapi files writing

[Giulio Paci <giuliopaci interfree it>]

Il 17/11/2011 14:54, Daniel Espinosa ha scritto:
> 2011/11/16 Giulio Paci <giuliopaci interfree it>:
> > Hi to all,
> >        I am trying to (re)write Vala bindings for libcurl.
> >
> > I started following the instruction in this page
> > http://live.gnome.org/Vala/Bindings
> > and using information from this page
> > http://live.gnome.org/Vala/Manual/GIDL%20metadata%20format
>
> Add to your list of useful information:
>
> [1] https://live.gnome.org/Vala/Manual/Attributes
>
> There are lot of annotations you must add to your code in order to do
> what you want to.
>
> > At last I got a libcurl.gi that was close to what I expected and I tried
> > to write a metadata file to get an usable vapi file. Unfortunately I
> > have some problems completing the task.
> >
> > I have attached an example containing some of the problem I am currently
> > facing. The libcurl.vapi.target is the desired vapi file, while the
> > libcurl.vapi is obtained from libcurl.gi and libcurl.metadata using
> > vapigen (0.14).
>
> Are there GLib bindings of libcurl?
>
> This is because Vala is moving to GIR and is easy to make glibcurl
> could generate GObject-Introspection information, using annotations
> inside the GLib/C code, then generate the Vala bindigs: Advantage: you
> will help lot others languages (not just Vala) to use libcurl like
> Python, JavaScript and other with support of GObject Introspection.

Thank you for the suggestion. I will try writing bindings for glibcurl
as soon as I have time, and after I have libcurl bindings working fine.
The problem I can see with glibcurl is that it is not released as a
library but as code that you have to include in your project.

> > The main issues are:
> > 1) How can I specify that a method (curl_easy_init) is the constructor
> > of a class (EasyHandle)?
> > 2) How can I instruct vapigen that a function is a method of a class and
> > not a static function?
> > 3) How can I instruct vapigen to put a cname attibute where needed (e.g.
> > for the EasyHandle class or the Code enumeration)?
> > 4) How can I handle an enumeration value with a different prefix from
> > all the other values (e.g.: the last value in the Code enumeration)?
> > 5) Is there any way I can put a static function in a nested namespace
> > (e.g.: Curl.Global.init())?
>
> Most of this questions can be solved by see at Attributes is [1]
> above. I'm not realy sure how to add that annotations using metadata,
> but you can add custom code instead.

The Attributes page was already one of my sources. Unfortunately most of
the annotations have a meaning only inside vala/vapi files and not in
the metadata file. If there is no better way, I think I am going to fix
the vapi file by hand.

Bests,
        Giulio.