Re: scheme --> (define-music-function ...)

[Paul]

> > Would somebody combine the two and put me out of my misery?
> 
> The former?  No.  The latter:

You propose a good solution - thank you.

> If you are really talking about the octave _starting_ from middle C,
> you'd write 3 instead of 0 as the second argument of ly:make-pitch.

I really do mean the octave /starting/ from middle C, such that the
notes on a keyboard ascending from middle C are:

    c4 d4 e4 f4 g4 a4 b4 c5

(Those numbers are the octave, not note lengths.)

I simply wanted a blunt way to say "make sure this note is in /this/
octave" - in a way that makes unambiguous sense to me.  I usually
remove superfluous checks after the music compiles successfully.

Here's the final snippet:

    midiOctaveCheckPreviousNote =
    #(define-music-function (parser location oct-n) (integer?)
      #{ \octaveCheck $(ly:make-pitch (- oct-n 4) 3) #})

And the last three notes in the scale mentioned above:

    a \midiOctaveCheckPreviousNote 4
    b \midiOctaveCheckPreviousNote 4
    c \midiOctaveCheckPreviousNote 5

--
P.