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Date: Mon, 11 Jan 2016 16:26:38 +0100 (CET)
From: Roland Lutz <rlutz AT hedmen DOT org>
To: "Matt Rhys-Roberts (matt DOT rhys-roberts AT envinsci DOT co DOT uk) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Subject: Re: [geda-user] Searching for refdes's having a specific
 attribute?
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On Fri, 8 Jan 2016, Matt Rhys-Roberts (matt DOT rhys-roberts AT envinsci DOT co DOT uk) 
[via geda-user AT delorie DOT com] wrote:
> How could I search a directory of .sch schematic sheets for components 
> that contain a specific attribute, e.g. OrderCode=1234567, please?

This is a nice example of where the new Xorn libraries come in handy. :)

To use this, you need a recent git version of gEDA/gaf, and you have to 
either install gEDA/gaf to a standard location or add the subdirectory 
"xorn/built-packages" to the environment variable PYTHONPATH.  Then you 
can search for matching components like this:


import xorn.geda.attrib
import xorn.geda.read

sch = xorn.geda.read.read('schematic.sch')
for ob in sch.toplevel_objects():
     if isinstance(ob.data(), xorn.storage.Component) and \
         '1234567' in xorn.geda.attrib.search_attached(ob, 'OrderCode'):
             print xorn.geda.attrib.search_attached(ob, 'refdes')[0]


If you want to search a complete directory, here is how you could write a 
command-line utility which does that:


#!/usr/bin/python2.7
import os, sys
import xorn.geda.attrib
import xorn.geda.read

path = sys.argv[1]
name = sys.argv[2]
value = sys.argv[3]

for dirpath, dirnames, filenames in os.walk(path):
     for filename in filenames:
         if not filename.endswith('.sch'):
             continue
         sch = xorn.geda.read.read(os.path.join(path, filename))
         for ob in sch.toplevel_objects():
             if isinstance(ob.data(), xorn.storage.Component) and \
                value in xorn.geda.attrib.search_attached(ob, name):
                 print xorn.geda.attrib.search_attached(ob, 'refdes')[0]


You can call it like "./ordercode . OrderCode 1234567" to search the 
current directory for components with OrderCode=1234567.

> Basically, I need to fit components manually to a board, one specific 
> type at a time, to keep production neat. So I need to list them by 
> unique order code, ideally.

So what you ultimately want is a list of refdes's for each order code? 
You could compile that list like this:


#!/usr/bin/python2.7
import os, sys
import xorn.geda.attrib
import xorn.geda.read

path = sys.argv[1]
name = sys.argv[2]
result = {}

for dirpath, dirnames, filenames in os.walk(path):
     for filename in filenames:
         if not filename.endswith('.sch'):
             continue
         sch = xorn.geda.read.read(os.path.join(path, filename))
         for ob in sch.toplevel_objects():
             if not isinstance(ob.data(), xorn.storage.Component):
                 continue
             try:
                 refdes = xorn.geda.attrib.search_attached(ob, 'refdes')[0]
             except IndexError:
                 refdes = None
             for value in xorn.geda.attrib.search_attached(ob, name):
                 if value not in result:
                     result[value] = []
                 result[value].append(refdes)

for k in sorted(result.keys()):
     print '%s: %s' % (k, ' '.join(result[k]))


Call this script like "./ordercodes . OrderCode" to print a list of order 
codes and associated refdes' for the current directory.

Please note that, like any of the proposed solutions, this does not find 
OrderCode= attributes which are inherited from non-embedded symbols.  If 
you want to search these, too, have a look at this mail:

   http://article.gmane.org/gmane.comp.cad.geda.user/50021

If you loaded the schematic this way, you can replace "search_attached" 
with "search_all" to get inherited attributes, too.