Re: warning: programming error: must have Item for spanner bound of PercentRepeat

[Jonathan Kulp]

I added one thing to your code and the results are different, without 
programming errors and without the superfluous bar. See if you get what 
you want with this block:

piece = \drummode {
  \set countPercentRepeats = ##t
  \time 4/4
  \repeat percent 10 { \basicBar }
  % ...
}

Jon

Daniel Hulme wrote:
> I'm trying to re-engrave a percussion part I have been given to play and
> I get the above message, with a superfluous bar in my output. A minimal
> example and Lilypond's resulting message follows. I started with 2.10.33
> but updated to git master on Thursday night and the problem persists.
> Even if the problem is with my file it seems that reporting an alleged
> programming error must be helpful. I can try to fix the bug myself if
> someone points me in the right direction.
>
> Incidentally, it would be nice if there were some way to set the value
> of the counter on percent repeats, so (for instance) if the first bar of
> a phrase is slightly different from the second and subsequent bars, the
> first percent mark is numbered 3 to agree with the phrase structure
> (whereas now it would be 2). Also, a feature to only number every n'th
> percent mark would also be nice. Both of these properties are found in
> commercial parts, though less often than I would like.
>
> === percentrepeat.ly
> \version "2.11.62"
> \include "english.ly"
>
> basicSnare = \drummode { sn8 sn sn-> sn }
> basicBass = \drummode { bd8[ r16 bd16] bd8 r8 }
>
> basicBar = \drummode {
>   \repeat unfold 2 {
>     << \basicSnare \\ \basicBass >>
>   } |
> }
>
> piece = \drummode {
>   \time 4/4
>   \repeat percent 10 \basicBar
>   % ...
> }
>
> skips = #(ly:export (skip-of-length piece ))
>
> \score {
>   \new DrumStaff <<
>     \new DrumVoice = "1" { \skips }
>     \new DrumVoice = "2" { \skips }
>     \piece
>   >>
> }
>
> === output.log
>
> GNU LilyPond 2.11.63
> Processing `percentrepeat.ly'
> Parsing...
> Interpreting music... 
> percentrepeat.ly:15:2: warning: programming error: must have Item for spanner bound of PercentRepeat
>   
>   \repeat percent 10 \basicBar
> [8]
> Preprocessing graphical objects...
> programming error: Multi_measure_rest::get_rods (): I am not spanned!
> continuing, cross fingers
> Finding the ideal number of pages...
> Fitting music on 1 page...
> Drawing systems...
> Layout output to `percentrepeat.ps'...
> Converting to `./percentrepeat.pdf'...
>
> === end
>
>
>
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--
Jonathan Kulp
http://www.jonathankulp.com