Re: gEDA-user: How to deal with single/dual parts?

[Peter Clifton <pcjc2@xxxxxxxxx>]

On Fri, 2009-11-20 at 10:19 +0100, Stephan Boettcher wrote:
> 
> Remotely related to this topic, I had this idea:
> 
> Often, there are several choices for footprint, model, whatever
> attribute that need to to chosen at some point in the flow.  We have proposals
> for a kind of database to support the options.
> 
> For a lot of simple applications/flows, an extra database may be
> overkill, so why not put the database into attributes of the symbols in
> a library.  The attributes may be names like
> 
>    footprint-option=0603
>    footprint-option=0805
> 
> or
> 
>    footprint-options=0603;0805
> 
> or both.  The gattrib and gschem GUIs can provide support by looking for
> these attributes and offer menus to select from the list of choices when
> modifying attributes.
> 
> It may be possible to provide a sloting mechanism like this as well. Or
> add gui support for the existing slotting mechanism, or to abuse the
> existing sloting mechanism, like this:
> 
>   numslots=1
>   slotdef=1:1,2,3
>   slotdef-option=@BIG:1:1,2,3  
>   slotdef-option=@SMALL:1:3,2,1
>   footprint=TO220
>   footprint-option=@BIG:TO220
>   footptint-option=@SMALL:SO223
> 
> No new policy imposed, no file-format changes, no gnetlist changes, just
> some new functions in the GUIs, for those who like to create/use a
> library/database of (heavy) symbols.

I disagree that it doesn't impose new policy though. Perhaps it doesn't
"impose" it if it is in a module, but it does define semantic meaning to
a number of attributes.

It is the kind of proposal we need to be discussing. I'm not sure this
particular proposal is good / bad (probably aspects of both).

Do those rules sit in the core of libgeda, and apply to every symbol
ever loaded, for any work-flow, or does it need to sit in a separate and
optional module (probably shipped switched on).

Best wishes,

Peter C.



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