gEDA-user: Rule-based assignment of default attributes

["Cesar Strauss" <cestrauss@xxxxxxxxx>]

Hi,

I just thought about a way to have defaults for footprint assignments
and such, while keeping it easy to change them project-wide, and at
the same time keeping local customizations.

How about having a text file, with rules like:

match device=RESISTOR
assign footprint=1206

Then, any resistor without a footprint attribute will be a 1206 by
default. Resistors with attributes assigned manually will not be
touched. Note that I'm not adding attributes to the symbols, just
providing defaults.

Then, to change the default, project-wide, just modify one line in the
rules file.

A more advanced example, which assumes you singled-out all decoupling
capacitors by adding an extra attribute:

match device=CAPACITOR, function=DECOUPLING
assign footprint=1206, value=100n, part=<manufacturer part number>

You get the idea.

For single-file schematic projects, you could avoid having to ship one
extra file by embedding it in the schematic somehow.

A benefit, as I see it, is that you keep fewer attributes hardcoded in
the schematic, fostering reuse.

I do mean to code it myself if nobody else does. Just don't hold your
breath (I've been meaning to add tabbed pages to gschem since 2006,
and I didn't even get around to start coding).

Regards,
Cesar


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