Re: transposing music via command line argument

[Marc Hohl]

Am 27.12.2011 14:45, schrieb Marc Hohl:
> Hello list,
>
> in another thread, my problems with command line arguments were
> solved (or workarounds provided), but now I am stuck with
> another but similar problem:
>
> I want to transpose some music and tell lilypond the 'to' pitch
> in the command line:
>
> lilypond -dpitch="e'" myfile.ly
>
> where myfile.ly is
>
> \version "2.15.24"
>
> optionalTranspose = #(define-music-function (parser location music) 
> (ly:music?)
>   (let ((mypitch (ly:get-option 'pitch)))
>        #{ \transpose c $mypitch  $music #}))
>
> melody = { c'4 d' e'2 }
>
> \score {
>   \new Staff {
>      \new Voice { \optionalTranspose \melody }
>   }
> }
>
> Lilypond refuses to see mypitch as a pitch. I tried to convert it
> with (ly:music-property mypitch 'pitch), but lilypond soesn't take
> the command line argument as a music expression, too.
>
> Is there any chance to convince lilypond to accept a pitch on
> the command line?
To answer my own request: I got around the problem by using
three command line options:octave, note and alteration.

optionalTranspose = #(define-music-function (parser location music) 
(ly:music?)
  (let* ((octave (or (ly:get-option 'octave) -1))
         (note (or (ly:get-option 'note) 0))
         (alteration (or (ly:get-option 'alteration) 0))
         (to (ly:make-pitch octave note alteration)))
       #{ \transpose c $to  $music #}))

music = {
  \key c \major
  c'4 d' e'2
}

\score {
  \new Staff {
     \new Voice {
      \optionalTranspose { \music }
    }
  }
}

This works with

lilypond -doctave=-1 test.ly
lilypond -dnote=1 -dalteration=-1/2 test.ly

and so on.

Regards,

Marc