Re: gEDA-user: gnetlist l and m options

[Peter Clifton <pcjc2@xxxxxxxxx>]

On Fri, 2008-01-04 at 22:23 -0500, Paul Tan wrote:
> Hi Peter C,
> 
> Have you tried "(define (xxx  " instead of  "(define xxx" and/or
> setting flag indication?

No, I'm by no way knowledgeable about scheme. If you could explain what
these do, then by all means, I will try.


Btw.. it was the packages list (and similar) which gave me problems:

(define packages 
  (gnetlist:get-packages "placeholder"))

This evaluates immediately on loading gnetlist.scm, calling a C function
in gnetlist which I wasn't ready (at this point) for it to be calling.

I tried playing with (delay ...), but this gave me a promise object
rather than (as I'd anticipated) some magic way of deferring evaluation
until the first usage.



> Best Regards,
> Paul Tan
> 
> -----Original Message-----
> From: Peter Clifton <pcjc2@xxxxxxxxx>
> To: gEDA user mailing list <geda-user@xxxxxxxxxxxxxx>
> Sent: Fri, 4 Jan 2008 5:55 pm
> Subject: Re: gEDA-user: gnetlist l and m options
> 
> 
> 
> On Fri, 2008-01-04 at 20:19 -0500, Paul Tan wrote:
> > Hi Steve,
> >
> > I am not using that feature currently, but its a nice feature and I
> > might
> > use the post-backend feature in the future.
> 
> Tangentially related....
> 
> To fix the spice-sdb slotting feature (patches not committed yet, but
> awaiting comments), I had to explicitly split gnetlist.scm into two
> parts. I moved gnetlist.scm and the netlist backend to load BEFORE
> traversing the board, and have  gnetlist-post.scm run AFTER.
> 
> This is because I introduced (propose to introduce) a scheme hook for
> determining the UREF of a component. This is determined during schematic
> traversal time, so at this point, the backend must have loaded.
> However.. gnetlist.scm also has some (define ...) code which is
> evaluated as soon as gnetlist.scm is loaded, and MUST NOT be run until
> after traveral. (This was the bit I moved to gnetlist-post.scm).
> 
> 
> --
> Peter Clifton
> 
> Electrical Engineering Division,
> Engineering Department,
> University of Cambridge,
> 9, JJ Thomson Avenue,
> Cambridge
> CB3 0FA
> 
> Tel: +44 (0)7729 980173 - (No signal in the lab!)
> 
> 
> 
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-- 
Peter Clifton

Electrical Engineering Division,
Engineering Department,
University of Cambridge,
9, JJ Thomson Avenue,
Cambridge
CB3 0FA

Tel: +44 (0)7729 980173 - (No signal in the lab!)



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