lily in scheme : using music expressions

[Nicolas Sceaux]

hi

A question about the use of variables in an embedded lily forms.
As it is done now,

  #{ \override TextScript #'padding = #$pad #}

is read as:

  #(ly:parse-string-result
     (format #f " \override TextScript #'padding = #~a " pad)
     (current-module))

that is, `pad' is written in the string to be parsed. This is ok for
numbers, strings, ie values which printed representation can be
re-read.

One might wonder if one could also use a music expression here. For
instance: 

  (define (add-some-props music)
    #{ \override bla bla
       \override bli bli
       $music
       \revert bla
       \revert bli #})

Of course there are other ways to do that, but from a user point of
view, this may be handy. 

However, this requires a music printing function, which is not
exactly trivial.

Do you think that would be valuable, or useless, or impossible, ... ?

nicolas