Re: [Bug?] Dotting notes by music function

[Juergen Reuter]

Ah, thanks, now I understand!  But then, in the manual in Sect. 12.1.2 
(Simple substitution functions), in the

custosNote = #(define-music-function (parser location note)
                                          (ly:music?)

example, "note" should better be renamed into "event" or something similar 
to avoid misunderstandings, right?

By the way, do we have a generic substitution function that you can pass 
an event type and some replacement expression to?  Maybe something like

(replace-for-all-matches
  #(define-matching-expression (any-music-event-of-type 'NoteEvent))
  Music
  #(define-replacement-expression
    (original-match) (... <an expression in terms of original-match that
    is used as replacement for original-match> ...))),

where, in this example, the specified replace function is executed exactly 
once for each 'NoteEvent (i.e. the matching expression) in Music (with 
the note event passed as "original-match" argument to the replacement 
expression) in order to replace the original match by the result of the 
replacement expression?

(By the way, please note that I do not explicitly specify here the type of 
the matching expression, i.e. the return type of the 
any-msuic-event-of-type function.  In the most general case, it could be 
an attributed music expression subgraph in order to implement a graph 
rewriting system.  For now, I would be happy, if it would be just 
a music event type such as 'NoteEvent, in order to match all events of a 
given specific type.)

I guess, such a function would save lots of duplicated code used for 
navigating through music expressions, right?  Or do we already have such a 
function?

Thanks & Greetings,
Juergen


On Fri, 13 Oct 2006, Nicolas Sceaux wrote:

> Juergen Reuter <address@hidden> writes:
>
> > Hi, all!
> >
> > I would expect the following lily file:
> >
> > \version "2.9.22"
> >
> > dottedQuarter =
> > #(define-music-function (parser location note) (ly:music?)
> >    (make-music
> >     'NoteEvent
> >     'duration (ly:make-duration 2 1)
> >     'pitch (ly:music-property note 'pitch)))
> >
> > \new Voice \transpose c c' {
> >   f4 f \dottedQuarter f f f
> > }
> >
> > to produce the notes:
> >
> > f4 f4 f4. f4 f4
> >
> > However, it produces:
> >
> > f4 f4 c4. f4 f4
> >
> > That is, the pitch changes from "f" to "c", although I am trying to
> > copy it from the original note.  Is this a bug or am I doing something
> > wrong?
>
> Are you sure that the note argument as a pitch property? Try:
>
> \displayMusic f4
>
> nicolas