Re: Typesetting tweak with percent repeat

[Aaron Hill]

On 2018-04-24 20:19, Evan Driscoll wrote:
> For example, in the document below, I'd like an upbow over the percent 
> in
> measure 2. How can I get that? The \upbow on the s1 that's in there now
> doesn't work.
>
> Thanks,
> Evan

From what I can tell, there are at least two issues you are fighting.

Firstly, adding \upbow to the spacer does not result in the articulation 
being applied to the PercentEvent.  All the \makePercent music function 
does is use ly:music-length to measure the length of the music 
expression supplied.  None of the content within that music is 
displayed.

Secondly, the documentation does mention that a PercentEvent consists 
only of the percent symbol stencil itself.  The following theoretically 
could add the desired articulation, but as expected nothing else prints:

%%
  (make-music 'PercentEvent
    'length (ly:music-length note)
    'articulations (list
      (make-music 'ArticulationEvent 'articulation-type "upbow")))
%%

There is a simple workaround, however, which is to attach the 
articulation to an empty chord before the percent repeat:

%%
  cello = \relative c {
    a4(\downbow b c d) |
    <>\upbow \makePercent s1 \bar "||"
  }
%%

The resulting alignment might not be to your taste, as the articulation 
ends up positioned towards the left side of the measure, not centered 
above the percent symbol.  But you should be able to tweak that manually 
as desired:

%%
  <>-\tweak X-offset #1.5 \upbow
%%

-- Aaron Hill