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From: "karl AT aspodata DOT se [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To: geda-user AT delorie DOT com
Subject: Re: [geda-user] lepton netlist
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Comments: In-reply-to "=?utf-8?Q?Stephan_B=C3=B6ttcher?= (geda AT psjt DOT org) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
   message dated "Wed, 24 Apr 2024 19:16:13 +0200."
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Date: Wed, 24 Apr 2024 23:15:35 +0200 (CEST)
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Stephan:
...
> >> My patch was doing simple text substitutions in attributes after the
> >> hierarchy was built, so the parameters cannot effect the netlist
> >> itself, just some output.  I used it only with value= attributes.  That
> >> would be the minimal functionality.
> >
> > So, it would be the bom list and the like that would be affected ?
> > In that case an external program could do the transform, so you do your
> > usual stuff and then as a final step you modify some output files with a
> > separate program. Would that be fine (at least till it is integrated 
> > into lepton) ?
> 
> I extract my boms from the .pcb file, and usually there are a lot of
> handwritten changes before it goes to a technician, so it is not
> essential to have this functionally in the netlister.  When the bom now
> says value=$R2 it is at least obvious where I need to add information :-)
...

Soo, what do you use the substitution for ?

///

My thoughts is more in line with

 in a page
C ... source_symbol.sym
{
T ...
source=led_resistor
input_voltage=12
}

 and its subpage
C ... led.fp
{
T ...
led_voltage=2
led_current=0.020
}
C .... resistor.fp
{
T ...
value=E6((input_voltage - led_voltage) / led_current)
}

where E6() chooses a nearest value in the E6 series, or
if you like, the available values of som component serie.

Also nice would it be if I could use units, like in
led_current=20mA or at least 20m.

I do have code for unit prefixes and E6 etc. in
https://aspodata.se/git/openhw/bin/Prefix.pm
https://aspodata.se/git/openhw/bin/Eseries.pm

///

 Regarding bom's, I have 
https://aspodata.se/git/openhw/bin/GnetBom2.pl
 which converts lepton-netlist -g bom2 output file
 to something like
 (i.e. sorted by device, footprint, component value):

Capacitor       ipc7351b_2012Ar.fp           1n             1 aC3
Capacitor       ipc7351b_2012Ar.fp           10n            1 3C2
Capacitor       ipc7351b_2012Ar.fp           15n 5%         8 t0C21 ...
Capacitor       ipc7351b_2012Ar.fp           33n 5%         8 t0C11 ...
Capacitor       ipc7351b_2012Ar.fp           100n          19 12C2 ...
Capacitor       ipc7351b_2012Ar.fp           1u            10 12C1 ...

Regards,
/Karl Hammar