<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <!-- header_tag --> <html lang="en"> <head> <title>Tweaking with Scheme - GNU LilyPond Learning Manual</title> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <meta name="description" content="GNU LilyPond Learning Manual"> <meta name="generator" content="makeinfo 4.11"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="Scheme-tutorial.html#Scheme-tutorial" title="Scheme tutorial"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- Copyright (C) 1999--2007 by the authors Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.1 or any later version published by the Free Software Foundation; with no Invariant Sections. 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But we have even more power if we use Scheme. For a full explanation of this, see the <a href="Scheme-tutorial.html#Scheme-tutorial">Scheme tutorial</a>, and <a name="index-Interfaces-for-programmers-464"></a><a href="../lilypond/Interfaces-for-programmers.html#Interfaces-for-programmers">Interfaces for programmers</a>. <p>We can use Scheme to simply <code>\override</code> commands, <p>TODO Find a simple example <!-- This isn't a valid example with skylining --> <!-- It works fine without padText -td --> <p>We can use it to create new commands: <!-- Check this is a valid example with skylining --> <!-- It is - 'padding still works --> <blockquote> <pre class="verbatim"> tempoMark = #(define-music-function (parser location padding marktext) (number? string?) #{ \once \override Score . RehearsalMark #'padding = $padding \once \override Score . RehearsalMark #'extra-spacing-width = #'(+inf.0 . -inf.0) \mark \markup { \bold $marktext } #}) \relative c'' { c2 e \tempoMark #3.0 #"Allegro" g c } </pre> <p> <a href="../dd/lily-8615b8fa.ly"> <img align="middle" border="0" src="../dd/lily-8615b8fa.png" alt="[image of music]"> </a> </p> </blockquote> <p>Even music expressions can be passed in: <blockquote> <pre class="verbatim"> pattern = #(define-music-function (parser location x y) (ly:music? ly:music?) #{ $x e8 a b $y b a e #}) \relative c''{ \pattern c8 c8\f \pattern {d16 dis} { ais16-> b\p } } </pre> <p> <a href="../22/lily-99fb2d57.ly"> <img align="middle" border="0" src="../22/lily-99fb2d57.png" alt="[image of music]"> </a> </p> </blockquote> <!-- footer_tag --><br><hr> <div class="node"> <p> Up: <a rel="up" accesskey="u" href="Scheme-tutorial.html#Scheme-tutorial">Scheme tutorial</a> </div> <div style="background-color: #e8ffe8; padding: 2; border: #c0ffc0 1px solid;"> <p> <font size="-1"> This page is for LilyPond-2.11.57 (development-branch). <br> <address> Report errors to <a href="http://post.gmane.org/post.php?group=gmane.comp.gnu.lilypond.bugs">http://post.gmane.org/post.php?group=gmane.comp.gnu.lilypond.bugs</a>. </address> <br> Your <a href="http://lilypond.org/web/devel/participating/documentation-adding">suggestions for the documentation</a> are welcome. </font> </p> </div> <P> Other languages: <a href="Tweaking-with-Scheme.es.html">espaƱol</a>. <BR> </P> </BODY></html>