Re: Lily inside scheme

[Nicolas Sceaux]

Sun, 25 Apr 2004 21:55:23 +0200, Jan a dit : 

 > Looks good.  When you feel this has fleshed out, there should be some
 > documentation (but I'm still `waiting' for the \book stuff to
 > stabilize before writing real documentation, eg).

OK, of course. Even if the internals will change, the interface, which
is still simple, can be documented. I'm beginning a draft.

 > Maybe the explanation of #{ #} should already be moved/added to NEWS
 > file?

a possible explanation for NEWS.texi:

   * LilyPond expressions can be embedded into Scheme, thanks to the
     `#{ ... #}' syntax. Within such a block, Scheme forms, for
     instance variable names, can be introduced thanks to a `$'
     character (`$$' has to be used to issue a single `$' character).
     These forms are then 'printed' in the pattern, as if they were
     called by (display).

          #(define (textoffset dx dy)
             (ly:export
               #{ \override Voice.TextScript #'extra-offset = #(cons $dx $dy) 
#}))
          
          \score {
            \notes {
              c'^"normal text"
              %% the following statement is the same as
              %% \override Voice.TextScript #'extra-offset = #(cons 2 -3)
              #(textoffset 2 -3)
              c'^"text with offset"
            }
          }

nicolas