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Date:	Fri, 4 Sep 2020 15:11:40 +0200 (CEST)
From:	Roland Lutz <rlutz AT hedmen DOT org>
To:	"Roger Traylor (traylor AT engr DOT orst DOT edu) [via geda-help AT delorie DOT com]" <geda-help AT delorie DOT com>
Subject:	Re: [geda-help] Linux
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On Thu, 3 Sep 2020, John Doty wrote:
> On Sep 3, 2020, at 6:01 PM, Roland Lutz <rlutz AT hedmen DOT org> wrote:
> > On Wed, 2 Sep 2020, John Doty wrote:
> > > I favor Lepton [because] it’s agnostic about which layout program 
> > > you use: it has no favored layout component. […]
> > > The layout people I work with all have different favorite tools, so 
> > > decoupling schematic entry and layout is very important to me.
> > 
> > This is absolutely the same for gEDA/gaf.
> 
> No, gEDA/gaf is joined to PCB. The tail wags the dog.

gEDA/gaf supports a variety of layout programs via netlister backends, 
some of which you contributed yourself.  There's even backends for SPICE 
and cascade simulation which doesn't involve layout at all.


>> Xorn is an internal component; you don't have to understand or even 
>> consciously interact with it in any way.  (But even if you did, it's 
>> not more complicated than the Scheme API.)
> 
> Except if you’re writing back ends, you do.

There's a Scheme and a Python variant of the gnetlist API.  You can use 
either to write a backend.


> I’ve done things in Python. It wasn’t the problem. The problem was to 
> figure out the API.

Let's stay at the example of the Osmond PCB backend.  It accesses the 
netlist in the following ways:

- netlist.packages (the packages in the netlist)
- netlist.nets (the nets in the netlist)

- package.refdes (the refdes of the package)
- package.get_attribute('footprint', 'unknown') (gets the "footprint" 
attribute of the package, with "unknown" as the default)

- net.name (the name of the net)
- net.connections (a list of pins connected to the net)

- pin.number (the pinnumber)
- pin.package (the package to which the pin belongs)

What about that do you consider hard to figure out?


Roland

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