(ly:music-property music 'tweaks)))
music)
+undo =
+#(define-music-function (parser location music)
+ (ly:music?)
+ (_i "Convert @code{\\override} and @code{\\set} in @var{music} to
+@code{\\revert} and @code{\\unset}, respectively. Any reverts and
+unsets already in @var{music} are ignored and not converted.")
+ (let loop
+ ((music music))
+ (let
+ ((lst
+ (fold-some-music
+ (lambda (m) (or (music-is-of-type? m 'layout-instruction-event)
+ (music-is-of-type? m 'context-specification)))
+ (lambda (m overrides)
+ (case (ly:music-property m 'name)
+ ((OverrideProperty)
+ (cons
+ (make-music 'RevertProperty
+ 'symbol (ly:music-property m 'symbol)
+ 'grob-property-path
+ (cond
+ ((ly:music-property m 'grob-property #f) => list)
+ (else
+ (ly:music-property m 'grob-property-path))))
+ overrides))
+ ((PropertySet)
+ (cons
+ (make-music 'PropertyUnset
+ 'symbol (ly:music-property m 'symbol))
+ overrides))
+ ((ContextSpeccedMusic)
+ (cons
+ (make-music 'ContextSpeccedMusic
+ 'element (loop (ly:music-property m 'element))
+ 'context-type (ly:music-property m 'context-type))
+ overrides))
+ (else overrides)))
+ '()
+ music)))
+ (cond
+ ((null? lst) (make-music 'Music))
+ ((null? (cdr lst)) (car lst))
+ (else (make-sequential-music lst))))))
+
unfoldRepeats =
#(define-music-function (parser location music) (ly:music?)
(_i "Force any @code{\\repeat volta}, @code{\\repeat tremolo} or