Re: Trying to evaluate a music expression in scheme

[Nicolas Sceaux]

Le 19 juin 08 à 05:44, Carl D. Sorensen a écrit :

> [...]
> I need to know the name of the function to call so I can write  
> something like this:
>
> (load-predefined-diagram "\chordmode {c}" ((string-fret1) (string- 
> fret2) (string-fret3) (string-fret4)))
>
> then
>
> (let ((notes (this-is-the-function-I-need "\chordmode{c}"))
>
> will return the same list of note events as is passed to determine- 
> frets, so I can use it as a  hash-index
> for writing the diagram to the hash table.
>
> Does this-is-the-function-I-need exist?  I have looked at  
> ly:interpret-music-expression, but this looks like
> it's aimed at the top-level music expression.  If the function does  
> exist, what is it called?  If it doesn't, can
> anybody give me a pointer as to where I might go to get some ideas  
> about how to create it?

Usually, one have access to LilyPond syntax from scheme code
using the #{ #} construct.

(let ((music #{ \chordmode { c } #}))
   .. do something with music ..)

A `parser' object must exist where you use this code.

If this is not exactly what you're looking for, you may have a
look at scm/parser-ly-from-scheme.scm for inspiration.

Nicolas