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Re: an open question

From: Jan-Peter Voigt
Subject: Re: an open question
Date: Wed, 28 Mar 2018 09:14:01 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0

Hello Jacques,

yes, you are right. Any information without a "first class citizen" will not be exported right. One might think of additional properties to give an export specific attribute - that is to say: this markup shall indicate swing tempo in MusicXML. But before that I want to be able to export the major exportable elements. And like Libre Office warns when you save an MS Word document that there might be elements that cannot be exported as expected this export function should do the same ;-)


Am 28.03.2018 um 08:47 schrieb Jacques Menu Muzhic:
Hello Jan-Peter,

Thanks for the information.

Exporting to MusicXML is difficult, also because there are things that need to be done in LP with Scheme code since there’s no ‘first class citizen’ to do the job.

This leads for example to the use of markup for things such as the swing tempo indication:

tempoRelationshipStaffReduce = #-3

tempoRelationship =
#(define-music-function (parser location label parenthesized musicI musicII)
    (string? boolean? ly:music? ly:music?)
    (let* (
            (left-paren (if parenthesized "(" ""))
            (right-paren (if parenthesized ")" ""))
        \tempo \markup {
          \line \general-align #Y #DOWN {
            % 1st column in line

            % 2nd column in line


            \score {
              \new Staff \with {
                % reduce the font size a la cue
                fontSize = #tempoRelationshipStaffReduce
               \override StaffSymbol.staff-space = #(magstep tempoRelationshipStaffReduce)
                % hide the staff lines
                \override StaffSymbol.line-count = #0
                % align horizontally
                \override VerticalAxisGroup.Y-extent = #'(-0.85 . 0)

               % \override Score.SpacingSpanner.common-shortest-duration = #(ly:make-moment 1/2) % super-tight                % \override Score.SpacingSpanner.common-shortest-duration = #(ly:make-moment 1/4) % tight                % \override Score.SpacingSpanner.common-shortest-duration = #(ly:make-moment 3/16) % even                \override Score.SpacingSpanner.common-shortest-duration = #(ly:make-moment 5/32) % even

                % the left music
                \relative c' { \stemUp $musicI }

                % the equivalence sign
                \once \override Score.TextScript.Y-offset = #-0.4
                  \halign #-1 "="

                % the right music
                \relative c' { \stemUp $musicII }

              \layout {
                indent = 0
                \context {
                  \remove "Clef_engraver"
                  \remove "Time_signature_engraver"
              } % layout end
            } % score end


          } % line end
        } % markup end

     \tempoRelationship #"Swing" ##t
     \fixed b' {
       b8 [ b8 ]
     \fixed b' {
       \tuplet 3/2 { b4 b8 }

while they can be described natively in MusicXML:

      <direction placement="above">
          <metronome parentheses="yes" default-y="30" halign="left" relative-x="26">
               <metronome-beam number="1">begin</metronome-beam>
               <metronome-beam number="1">end</metronome-beam>
              <metronome-tuplet bracket="yes" show-number="actual" type="start">
               <metronome-tuplet type="stop">

I’m not at ease enough currently with the Scheme/Lilypond interaction to be of any help, unfortunately.


Le 26 mars 2018 à 07:29, Jan-Peter Voigt <address@hidden <mailto:address@hidden>> a écrit :

Hello Jacques,

last year I have been working on an export module for lilypond:
This is in an early stage, a proof of concept. I had to put this project aside for a while, but it is still on my agenda and hopefully it develops further soon.

So if anyone is interested in joining this challenge you may contact via the list or private mail.


Am 24.03.2018 um 17:47 schrieb Jacques Menu Muzhic:
Joe, what do mean exactly by pure data?
Jan-Peter, I’m interested in the MusicXML export from LP, can you tell us more?
A nice day!

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