"Sven Axelsson" <[EMAIL PROTECTED]> writes:
> Lilypond 2.6.0 Windows
> myCond = ##t
> \paper {
> bookTitleMarkup = \markup {
> \column {
> \fill-line {
> \large \bold \fromproperty #'header:title
> \fromproperty #'header:meter
> \line { \fromproperty #'header:composer " " \italic
> \fromproperty #'header:arranger }
> }
> #(if myCond ( #{\line { \fromproperty #'header:comment } #} ))
> }
> }
> }
> [...] but it always gives me a "unknown escaped string" for all the
> backslash expressions at the point right after \header, and
> "unexpected SCM_T" at the #(if statement.
#{ ... #} is for entering music expressions inside Scheme. What you want
here is to enter markup expressions. You can do that using the
'markup' macro. See the LilyPond manual:
http://lilypond.org/doc/v2.6/Documentation/user/out-www/lilypond/Markup-construction-in-Scheme.html
\version "2.7.0"
#(define my-cond #f)
\paper {
bookTitleMarkup = \markup {
\column {
\fill-line {
\large \bold \fromproperty #'header:title
\fromproperty #'header:meter
\line { \fromproperty #'header:composer " "
\italic \fromproperty #'header:arranger }
}
#(ly:export (if my-cond
(markup #:fromproperty 'header:comment)
(markup)))
}
}
}
\header {
title = "Title"
meter = "Meter"
composer = "Composer"
comment = "Comment"
}
\relative c'' { a b c d }
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