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Subject:	Re: [geda-user] Can an attribute be attached to text for later inclusion in gnetlist backend?
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From:	John Doty <jpd AT noqsi DOT com>
In-Reply-To:	<CAGde_xMkqgbbfH81MPOLPfTaui0wRvmUctk31r-eE3=fQ+U0pA@mail.gmail.com>
Date:	Mon, 22 Aug 2016 14:55:08 -0600
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On Aug 22, 2016, at 2:16 PM, Svenn Are Bjerkem =
(svenn DOT bjerkem AT googlemail DOT com) [via geda-user AT delorie DOT com] =
<geda-user AT delorie DOT com> wrote:

> Hi,
> I wonder if there is a way to attach an attribute to a block of text
> in gschem so that I can pick it out in the gnetlist backend.

You cannot, but attributes that aren=92t attached to anything may be =
retrieved via (gnetlist:get-toplevel-attribute attribute).

>=20
> Wanted to see if I could get the standard
>=20
> library ieee;
> use ieee.std_logic_1164.all;
> use ieee.numeric_std.all;
>=20
> through to a gnetlist backend

The back end at https://github.com/noqsi/gnet-spice-noqsi uses toplevel =
attributes =93spice-prolog=94 and =93spice-epilog=94 for the analogous =
purpose in SPICE. It uses this function:


;; Include "cards" from appropriate toplevel attributes.

(define (process-toplevel attr)
    (let ((t (gnetlist:get-toplevel-attribute attr)))
    	(or
	    (equal? t "not found")
	    (collect-card (expand-string #f t)))))

>=20
> Rationale is to
> a) edit the template for files using other libraries
> b) be able to do it fast and quick (text has multiline input)

Attributes can be multiline, although initial creation may be subtle. =
Text containing an =3D sign is an attribute as far as gnetlist is =
concerned.

> c) have it visible (or invisible) in the schematic depending on taste

For fancy visibility of a multiline attribute:

1. Make a single line attribute, adjust its visibility flags.
2. Edit as text.

This could be a little smoother, but it works.


>=20
> --
> Svenn
>=20

John Doty              Noqsi Aerospace, Ltd.
http://www.noqsi.com/
jpd AT noqsi DOT com



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