Re: Error message using AikenHeads with NullVoice

[David F.]

> On Jul 6, 2022, at 12:40 PM, David Wright <lilylis@lionunicorn.co.uk> wrote:
> 
> On Wed 06 Jul 2022 at 11:56:52 (-0600), David F. wrote:
>> [ … ]
>> The command to use aikenHeads comes from a separate style file that gets 
>> included for each hymn.  But there is an unfortunate interaction between 
>> aikenHeads and NullVoice: Lilypond outputs the following error message:
>> 
>> programming error: must have stem dir for note head
>> continuing, cross fingers
>> 
>> And it outputs a lot of these messages.  I need to find a way to stop 
>> Lilypond from outputting this error.  Any kind of quick fix or hack would be 
>> sufficient.
> 
> $ lilypond source-file.ly |& tee /tmp/complete-errors | grep -v 'programming 
> error: must have stem dir for note head' | grep -v 'continuing, cross fingers'
> 
> Is this hackish enough? The unfiltered errors are available
> for consultation in /tmp/complete-errors. I would need sed
> rather than grep to filter out the second line only when
> preceded by this particular first line.
> 
> Cheers,
> David.

Yes, that would be an option.  I’m already filtering the warning I get from 
setting a custom variable from the command line:

    "2>&1 | grep -v '^warning: no such internal option: 
\(aspect-ratio\|style\)$’”

But in this case, I’d be suppressing the error completely.  Which means that, 
in the future, if something I did were to also cause this error, I wouldn’t see 
it.

David F.