On 2019-11-17 12:38 pm, Paolo Prete wrote:
Hello,
is it possible to revert a tempo change to the previous tempo setting,
without explicitly writing this previous one?
Something like (pseudo-code):
\tempo 4 = 120 { ...some music .... } \temporaryTempo 4 = 160 { ...
some other music .... } \unset \temporaryTempo
Not sure if this is really the right way to do things:
%%%%
\version "2.19.83"
#(define tempoStack '())
pushTempo = #(define-music-function () ()
(define (pushTempoHelper ctx)
(let ((tempo (ly:context-property ctx 'tempoWholesPerMinute #f)))
(set! tempoStack (cons tempo tempoStack))))
#{ \context Score \applyContext $pushTempoHelper #})
popTempo = #(define-music-function () ()
(define (popTempoHelper ctx)
(let ((tempo (car tempoStack)))
(ly:context-set-property! ctx 'tempoWholesPerMinute tempo)
(set! tempoStack (cdr tempoStack))))
#{ \context Score \applyContext $popTempoHelper #})
\score {
{
\markLengthOn
\bar "||" \tempo "Andante" 4=90
\repeat unfold 2 { b'4 4 4 4 }
\bar "||" \pushTempo \tempo "Allegro" 4=140
\repeat unfold 2 { b'4 4 4 4 }
\bar "||" \popTempo \tempo "a tempo"
\repeat unfold 2 { b'4 4 4 4 }
}
\layout {} \midi {}
}
%%%%
-- Aaron Hill
