Re: cadenzaToMusic function, odd behavior causing barcheck failures

[James]

On 29/07/14 04:46, James Harkins wrote:
> Hi,
>
> Some time ago, a user here gave me a "cadenzaToMusic" function, which 
> could stretch rests in non-cadenza parts to match the duration of a 
> cadenza. (That's because I was having problems with compressing the 
> cadenza music to fit in a normal-length bar.)

More for information to the list really@

Part of the original thread you had it seems was from 2012  - it's only 
fair when you say 'sometime ago' as this will make a difference on the 
version of LP you were using at the time.

http://lists.gnu.org/archive/html/lilypond-user/2012-04/msg00125.html I 
think is that thread.

Which seems to imply this was originally written for \version 2.14.x and 
you're now using 2.18.x - again just to confirm so that the dev who 
helped (Thomas Morely by the looks of it) has a chance

;)

> I've used it in a couple of pieces and it's worked beautifully so far,...

In those 'so far' pieces, were they all for LP 2.14.x or was it working 
in a case for LP 2.18.2 (i.e. is this the first time you are using 
2.18.2 and find it no longer works as expected)?


James

> (whole rest, fermata) | 2/4 R2 | 6/8 (next section)
>
> Instead, I get
>
> (whole rest, fermata) | 2/4 R2 ...
>
> ... and here, the 6/8 appears in the middle of the bar. It looks like 
> the barlines are calculated as if the 2/4 bar contained three quarters.
>
> The issue doesn't reproduce in two cases:
>
> - If I replace the \cadenzaToMusic in the \score block with rests 
> adding up to the right duration, or
>
> - If I put the part with the cadenza notes (with *no* \cadenzaToMusic) 
> in the lowest staff. (I can't do that b/c it's a clarinet cadenza and 
> the piece also uses bassoon.)
>
> I'm really quite perplexed why this is happening. Can someone take a 
> look?
>
> Thanks,
> hjh
>
>
> \language "english"
> \version "2.18.2"
>
> cadenzaToMusic =
> #(define-music-function (parser location cadenzaMusic music)
>   (ly:music? ly:music?)
>   "Adjust the length of `music and the measureLength, to fit the 
> length of
> `cadenzaMusic"
>   (let* ((clen (ly:music-length cadenzaMusic))
>          (mlen (ly:music-length music))
>          (factor (ly:moment-div clen mlen))
>          (compressed (ly:music-compress music factor)))
>     ;; (format #t "factor : ~a\n" factor)
>     #{
>       \set Timing.measureLength = $clen
>       $compressed
>       \unset Timing.measureLength
>     #}))
>
> clarCadenzaC = { \cadenzaOn \repeat unfold 31 r8 \cadenzaOff }
>
> globalB = {
>  \time 4/4
>  \cadenzaOn \cadenzaToMusic \clarCadenzaC s1 \cadenzaOff
>  \bar "|"
>  \time 2/4 s2
>  \time 6/8 s2.
> }
>
> \score {  \new Staff <<
>    \globalB
>    \relative c' {
>      \cadenzaOn
>
>      % use the following line: barcheck failed, and 6/8 meter is in 
> the wrong place
>      \cadenzaToMusic \clarCadenzaC r1\fermata
>
>      % use the following line instead (comment the previous one), no 
> problem
>      %r8 \repeat unfold 15 { r4 }  % = 31 eighth notes
>
>      \cadenzaOff
>      R2
>      cs8 d e cs4.
>    }
>  >>
> }
>
>
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