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        Mon, 29 Jun 2015 14:01:59 -0700 (PDT)
Date: Tue, 30 Jun 2015 00:01:56 +0300
From: "Vladimir Zhbanov (vzhbanov AT gmail DOT com)" <geda-user AT delorie DOT com>
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Subject: Re: [geda-user] gEDA/gschem still alive?
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On Mon, Jun 29, 2015 at 07:46:36PM +0200, Stefan Salewski wrote:
> On Mon, 2015-06-29 at 10:54 -0600, John Doty wrote:
> > On Jun 29, 2015, at 9:44 AM, Stefan Salewski <mail AT ssalewski DOT de> wrote:
> > 
> > > On Mon, 2015-06-29 at 10:47 -0400, Jason White
> > > (whitewaterssoftwareinfo AT gmail DOT com) wrote:
> > >> Stefan, I think the easiest solution to net grouping attributes such as
> > >> "Power", "Analog", or "Digital" is to allow for each net to be displayed
> > >> with a different color.
> > 
> > The file format already supports line colors and styles. I have always
> > thought it would make more sense to represent nets and busses with
> > lines that have attached attributes than to have primitives for these.
> > What we have now is a factoring error. Not too serious, but a barrier
> > to the future.
> > 
> 
> gschem file format supports line colors and styles. But for nets only
> color index is available currently:
> 
> N 53500 61600 53000 61600 4

I wish nets had the same format as lines, too. For instance, schematic
for, say, a lathe plant could have centered earth nets, and power nets
could be more thick than others.

> 
> And my fear is that many colors and styles for nets are really confusing
> when displayed all the time. It may be OK when we generally use plain
> color/style for all nets, but when we query "show high current +5V nets"
> then these are shown in a special color and style. But I am not sure, we
> have to test that in real live, and that is some works...

You can always distinguish something by selecting it. For example, the
attached scheme script selects nets which netname attribute has the
value "power". It's trivially to assign a shortcut for it and, for
example, use a selected attribute as template. (For sure, there are
other ways to select what you want, but I think it's enough info yet for
those who are interested.)

Cheers,
  Vladimir

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Content-Disposition: attachment; filename="filter-power-nets.scm"

(use-modules (geda page))
(use-modules (geda attrib))
(use-modules (gschem selection))

(define (select-if-net! object)
  (and (net? object)
       (not (object-selected? object))
       (select-object! object)
       (select-net! object)))

(define (select-net! net-segment)
  (for-each select-if-net! (object-connections net-segment)))

(define (has-attrib? value objects)
  (and (pair? objects)
       (not (null? (car objects)))
       (or (string=? value (attrib-value (car objects)))
           (has-attrib? value (cdr objects)))))

(define (net-with-netname-value? netname-value object)
  (and (net? object)
       (has-attrib? netname-value (object-attribs object))))

(define (select-nets-with-netname! netname-value)
  (let ((power-segments
          (filter (lambda (object)
                    (net-with-netname-value? netname-value object))
                  (page-contents (active-page)))))
    (for-each deselect-object! (page-selection (active-page)))
    (for-each select-object! power-segments)
    (for-each select-net! power-segments)))

; main procedure
(select-nets-with-netname! "power")

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