[compiz] meta data update

[David Reveman]

On Tue, 2007-05-08 at 07:28 +0200, Danny Baumann wrote:
> Hi,
> 
> > Plugin dependencies have not yet been moved to the meta data system. I'd
> > like some feedback before we do this. I suggest that we use tags similar
> > to this:
> > 
> > <compiz>
> >     <plugin name="cube">
> >         <feature>large-desktop</feature>
> >         <deps>
> >             <requirement>
> >                 <plugin>png</plugin>
> >                 <feature>some-feature</feature>
> >                 <some_property>name-of-required-property</some_property>
> >             </requirement>
> >             <conflict>
> >                 <plugin>plane</plugin>
> >                 <feature>some-other-feature</feature>
> >             </conflict>
> >         </deps>
> >     </plugin>
> > <compiz>
> > 
> > It will make it easy to add new meta data tags that can be used as
> > requirements or conflicts.
> 
> Sounds good. What I am missing in your suggestion, however, is the
> definition of load order hints. Following your suggestion for
> requirements & conflicts, I would suggest the following:
> 
> <compiz>
>     <plugin name="someplugin">
>         <loadorder>
>             <before>someotherplugin1</before>
>             <after>someotherplugin2</after>
>         </loadorder>
>     </plugin>
> </compiz>

Sure but I would prefer something like this:

<compiz>
    <plugin>
         <deps>
             <relation type="before">
                 <plugin>someplugin</plugin>
             </relation>
         </deps>
    </plugin>
</compiz>

> 
> > The other thing that needs to be discussed related to this is whether
> > the core should be aware of any of these dependencies. I think that not
> > having the core be aware of any dependencies is definitely the best
> > solution. It's up to the plugins to deal with conflicts. Whether that is
> > to fail when loading or lack functionality doesn't matter but they will
> > of course not be allowed to crash.
> 
> Sounds fine to me.

Good, it's seems like everyone is OK with this so I think we can start
updating plugins.

- David