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Date:	Sat, 2 Jan 2016 19:14:28 +0100 (CET)
From:	Roland Lutz <rlutz AT hedmen DOT org>
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] What Xorn does, and why it does it like that
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On Sat, 2 Jan 2016, karl AT aspodata DOT se wrote:
> I would like to test xorn, I did "git pull -a" and found that
> there are two xorn branches. Which one should I use ?
>
> $ git branch -a | grep xorn
>  remotes/origin/home/rlutz/xorn-integration
>  remotes/origin/xorn

Xorn has already been merged into the master banch.  The branch 'xorn' 
reflects the current 'master' branch of the xorn repository, and 
'home/rlutz/xorn-integration' was a temporary branch which should be 
deleted.

> And for the exercise, I have an program I'd like to implement as you
> probably have seen in the mail thread of 'should we broaden scope of
> libgeda':
>
> Given a sch file, collect all sym files to a save directory.
>
> So, in xorn, which bindings are available, c and python, any more ?

For this program, you'll want to load a schematic file including all 
referenced and embedded symbol files.  This means you need:

* libxornstorage (a C library for which Python bindings exist)
* the symbol library mechanism (a Python module called 'xorn.geda.clib')
* the function 'read' from the Python module 'xorn.geda.read'

Right now, you'll either have to write the program in Python or embed a 
Python interpreter into your C program in order to call the necessary 
Python functions.  I'm planning to add a back-binding library so you can 
call the functions implemented in Python as C functions (or in any other 
language for which there are bindings), but I didn't find the time to do 
so yet.

The process would be about as follows:
* Add a DirectorySource for each directory to the symbol library (you 
might want to re-use the function 'symbol_library_search' from 
xorn/src/command/netlist.py).
* Load the schematic while passing 'load_symbols = True' to the function
'xorn.geda.read.read'.
* Iterate over all Component objects, writing the prim_objs of each unique 
symbol to the target directory.

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