Re: What is the problem with "\relative"? (Was: Do we really offer the future?)

[Simon Albrecht]

Am 25.04.2015 um 00:38 schrieb Thomas Morley:
> Hi all,
>
> I'm a little late to the party...
>
> One very annoying thing about \relative is when you want to use
> music-functions catching some music doing something with it.
>
> Here the less complex function I could think of, returning different
> results for absolute and relative.
> (It's only a show-case, the functionality could be achieved easily
> with other predefined commands, but I hope you'll get the point.)
>
> repeat-note =
> #(define-music-function (parser location music)(ly:music?)
>    (make-sequential-music (list music (ly:music-deep-copy music))))
>
> \absolute { c'1 \repeat-note c'' }
> \relative c' { c \repeat-note c'1 }
Well, either we require doing

\version "2.19.17"

repeat-abs-note =
#(define-music-function (parser location music)(ly:music?)
   (let ((music #{ \absolute $music #}))
     (make-sequential-music (list music (ly:music-deep-copy music)))))

\absolute { c'1 \repeat-abs-note c'' }
\relative c' { c \repeat-abs-note c''1 }

or we consider this a bug in (or enhancement request to) 
(ly:music-deep-copy), towards which I’m inclined.

Yours, Simon