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From: karl AT aspodata DOT se
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] A lesson from gnet-makefile
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Comments: In-reply-to "Vladimir Zhbanov (vzhbanov AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
   message dated "Sat, 17 Oct 2015 00:30:30 +0300."
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Date: Sat, 17 Oct 2015 23:54:28 +0200 (CEST)
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Vladimir 
> 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:
...
> > 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)

I consider that an unfair comparison. The the c code have to convert
the data which is in scheme so it has to do a fair amaount of 
conversions to please the scheme part of geda, hence it looks messy.

If you like you could write a map-lookalike in c and possibly the
same for apply, but the coder obviously didn't bother. If you want
elegance, you can do that to a degree in c also.

Regards,
/Karl Hammar

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