Re: Scheme question on strict substitution

[Mats Bengtsson]

No, this doesn't work.

What does work is
\version "2.10.0"

fraction = #(define-music-function (parser location music) (ly:music?)
    #{
       \tweak #'text #tuplet-number::calc-fraction-text $music
    #})


\relative c'{
\fraction
       \times 2/3 {
           c'8 c'8 c'8
       }

}

However, what is the reason to use \tweak at all? Why not simply do
an ordinary \once \override:

\version "2.10.0"

fraction = \override TupletNumber #'text = 
#tuplet-number::calc-fraction-text

\relative c'{
\fraction
       \times 2/3 {
           c'8 c'8 c'8
       }
}


  /Mats

address@hidden wrote:
> Hello,
>
> Does it work just to define this macro at the top level
>
>         fraction = \tweak #'text #tuplet-number::calc-fraction-text
>
> and then later in the music to write
>
>         \fraction
>         \times 2/3 {
>             c'8 c'8 c'8
>         }
>
> Does LilyPond swallow that?
>
> -- Tom
>
> -------------------------------------------------
>
> Trevor Baca wrote:
>
> Hi,
>
> I frequently write
>
>         \tweak #'text #tuplet-number::calc-fraction-text
>
> before tuplets, like this:
>
>         \tweak #'text #tuplet-number::calc-fraction-text
>         \times 2/3 {
>             c'8 c'8 c'8
>         }
>
> What's the best way to abbreviate to something like this?
>
>         \fraction
>         \times 2/3 {
>             c'8 c'8 c'8
>         }
>
> I've tried this music function ...
>
>    fraction = #(define-music-function (parser location) ()
>       #{
>          \tweak #'text #tuplet-number::calc-fraction-text
>       #})
>
> ... but get this parse error:
>
> Parsing...
> <string>:3:9: error: syntax error, unexpected '}'
>
>          }361.ly:5:0: error: errors found, ignoring music expression
>
> Any suggestions for a good abbreviation?
>
>   

--
=============================================
        Mats Bengtsson
        Signal Processing
        Signals, Sensors and Systems
        Royal Institute of Technology
        SE-100 44  STOCKHOLM
        Sweden
        Phone: (+46) 8 790 8463                         
       Fax:   (+46) 8 790 7260
        Email: address@hidden
        WWW: http://www.s3.kth.se/~mabe
=============================================