Re: Issue 2436 in lilypond: Patch: Directs displaying-grob-ancestry.ly to stderr

[Keith OHara]

 <lilypond <at> googlecode.com> writes:

> Comment #3 on issue 2436 by address@hidden: Patch: Directs  
>
> I'm trying to ensure that all progress messages go to stderr, 
> not stdout.  A by-product of this is that they are captured in 
> logfiles during make test and can also be checked as part of  
> the regression testing process.
> 

It is arguable whether the ancestry listings are progress messages
or program output.  The hoi polloi won't use that snippet at all,
but those they do use it probably do something like
  C:> lilypond displaying-grob-ancestry.ly >out.txt 2>err.txt
and will be mildly inconvenienced when the ancestry listings have
other progress messages interspersed.

I think it's fine to inconvenience them in this case.  The similar 
but more widely useful function \displayLilyMusic that is included
in LilyPond has your optional output-port argument, which is great
for making everybody happy.