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Date: Sat, 17 Oct 2015 00:30:30 +0300
From: "Vladimir Zhbanov (vzhbanov AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] A lesson from gnet-makefile
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On Tue, Oct 13, 2015 at 02:02:53PM -0400, Evan Foss (evanfoss AT gmail DOT com)
[via geda-user AT delorie DOT com] wrote:
> On Tue, Oct 13, 2015 at 12:23 PM, John Doty <jpd AT noqsi DOT com> wrote:
> >
> > On Oct 12, 2015, at 9:56 PM, Evan Foss (evanfoss AT gmail DOT com) [via
> > geda-user AT delorie DOT com] <geda-user AT delorie DOT com> wrote:
> >
> >>> Translation to the various layout and simulation tools is then a
> >>> job for gnetlist or xorn. Pcb, having no mechanism to do anything
> >>> with this data, isn't terribly relevant at present.
> >>
> >> Well there needs to be something that works like s_conn and it's
> >> partners in gnetlist that walks the list mapping the nets but with
> >> this added metadata.
> >
> > Walking lists is easy in Lisp: gnet-makefile.scm has functions like:
> 
> I understand that but I would really like to go back and do more of
> this in C. The final parsing of the net attributes into xyz output
> format should be in scheme. Although I could be wrong.
Do it the way you like it. I hope, if we'll have algorithms we need,
we'll be able to express them in the language we want.

I can only note that Scheme is a hi-level language wrt C and sometimes
(not always) it's better to express things in it rather than in C.

For example, the following code from gsymcheck

------------------------8<--------------------------
SCM_DEFINE (...)
{
TOPLEVEL* pr_current = edascm_c_current_toplevel ();
  GList *iter;
  PAGE *p_current;
  SCM page_s;
  SCM return_status = scm_from_int (0);

 /* C code to check all symbols */

  for ( iter = geda_list_get_glist( pr_current->pages );
        iter != NULL;
        iter = g_list_next( iter ) ) {

    p_current = (PAGE *)iter->data;
    page_s = edascm_from_page (p_current);

    return_status = scm_sum (return_status, check_symbol (page_s));
  }

  return return_status;
}
------------------------>8--------------------------

can be replaced just with

------------------------8<--------------------------
(apply + (map check-symbol (active-pages)))
------------------------>8--------------------------

in guile module (I'm just working on this)