I use lilypond to prepare modern-notation editions from mensural
notation. Many performers prefer to have the original note values (lots
of breves, longs, etc.) but it is quicker in lilypond to enter the notes
as half-value. In other words, it is quicker, and more readable, to
enter
c1 c2 c1 c2
than
c\breve c1 c\breve c1
etc.
To make the conversion easier, I've finally plucked up the courage to
delve into Scheme for the first time. In the hope that it will be of
use to someone, here is a way to parameterise the conversion. The
example below adjusts notes, time signature, and triplet spanner
appropriately, and will hopefully serve as a guide for automating other
similar conversions. I write the lilypond code using half-values, and
uncomment either line 2 or line 3 as appropriate:
\version "2.16.0"
%$(define HALFTIME 0) % for note values of original MS
$(define HALFTIME 1) % for halved note values
music = \relative c' {
\time $(cons 4 (+ 1 HALFTIME))
c2 d e f
\once \set tupletSpannerDuration = #(ly:make-moment 1 (+ HALFTIME
1))
\times 2/3 { g4 a g a c b } c1
}
\score {
\new Staff \shiftDurations $(- HALFTIME 1) #0 \music
\layout {}
}
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