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B.1 Tweaking with Scheme
We have seen how LilyPond output can be heavily modified using
commands like
\override TextScript #'extra-offset = ( 1 . -1). But
we have even more power if we use Scheme. For a full explanation
of this, see the Scheme tutorial, and
Interfaces for programmers.
We can use Scheme to simply \override commands,
TODO Find a simple example
We can use it to create new commands:
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
}
Even music expressions can be passed in:
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 }
}
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