Re: input/regression/graphviz.ly

[Stan Sanderson]

On Nov 30, 2007, at 7:07 PM, Joe Neeman wrote:

> 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.


Joe-

Thanks for the explanation. I did as you suggested (running from the  
terminal) and copied the output for the regression example. This is  
what was generated:

digraph G {
rankdir="LR"
node [shape=rectangle]
}

I saved the file, opened it with Graphviz, and (!) a rectangle was  
drawn. I'll assume it is working.

Regards,

Stan