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Re: input/regression/graphviz.ly

From: Joe Neeman
Subject: Re: input/regression/graphviz.ly
Date: Sat, 1 Dec 2007 12:07:11 +1100
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On Sat, 1 Dec 2007 11:28:11 Graham Percival wrote:
> Stan Sanderson wrote:
> > Would you briefly explain what I might expect from the the graphviz.ly
> > example? I'm not sure whether #(graph-write graph (current-error-port))
> > would/should do anything on my Mac. I do have Graphviz.app v.1.13 on my
> > machine, but have not worked with it.

The contents of a graphviz-readable file should be dumped to the console (or a 
log file?). If you save lilypond's output (from "digraph G" to the end) to a 
file named test.dot and run
$ dot -Tps test.dot -o test.ps
(or using graphviz somehow from the gui -- I don't know how, sorry) then you 
should get a .ps file that shows internal interactions between grobs.

Since this output is mainly used for internal debugging, I'm not exactly sure 
what counts as a regression. I suppose as long as the output works with 
graphviz to correctly render a graph, it counts as working. I've just checked 
that it works for me with graphviz version 2.12; if it doesn't work with your 
version, I'll add a comment to that effect in the file.


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