gEDA-user: two refdes's

[Peter TB Brett]

On Monday 09 July 2007 05:06:14 John Doty wrote:

> > I've debating fixing this (for a while now), by changing it so that
> > you will be able to put any keyword into any *rc file and then all
> > the programs would read *one* system-gafrc file and bugs like this
> > wouldn't be an issue.  I won't get rid of the system-programrc
> > files or
> > the local programrc files since they have their use, but what can go
> > into them will be come regular and the same across all the programs.
> > The grossness to this approach is that it pushes more *rc stuff into
> > libgeda and that isn't so nice.
>
> Is it possible to define a Scheme function (say, geda-option) that
> will evaluate another function if it exists, but do nothing if it
> doesn't? So instead of writing:
>
> (keyword args)
>
> you could write:
>
> (geda-option "keyword" args)
>
> Then, an option private to a particular program could still be set in
> gafrc without having to give libgeda knowledge of it, but a program
> that doesn't use that option would be unaffected.

Many options which are currently implemented as special-case functions could 
easily be just implemented as Scheme-defined variables which are obtained 
from the current Guile environment as and when needed[1].

(define attribute-promotion "enabled")

This is slightly more friendly from the Scheme perspective too, because it 
provides more transparency from Scheme scripts.

Of course, you could add a nice wrapper function to libgeda to make the 
process easier.

                        Peter

[1] Obviously, there are exceptions; the component library system for one.  It 
would be nice to fix this.
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