(let ((chord-repeat (ly:music-property music 'duration)))
(cond
((not (ly:duration? chord-repeat))
- music)
+ (if (any (lambda (m) (ly:duration?
+ (ly:music-property m 'duration)))
+ (ly:music-property music 'elements))
+ music
+ last-chord))
(last-chord
(set! (ly:music-property music 'duration) '())
(copy-repeat-chord last-chord music chord-repeat event-types)
(map loop arts)))
music))))
+(define-public (for-some-music stop? music)
+ "Walk through @var{music}, process all elements calling @var{stop?}
+and only recurse if this returns @code{#f}."
+ (let loop ((music music))
+ (if (not (stop? music))
+ (let ((elt (ly:music-property music 'element)))
+ (if (ly:music? elt)
+ (loop elt))
+ (for-each loop (ly:music-property music 'elements))
+ (for-each loop (ly:music-property music 'articulations))))))
+
+(define-public (fold-some-music pred? proc init music)
+ "This works recursively on music like @code{fold} does on a list,
+calling @samp{(@var{pred?} music)} on every music element. If
+@code{#f} is returned for an element, it is processed recursively
+with the same initial value of @samp{previous}, otherwise
+@samp{(@var{proc} music previous)} replaces @samp{previous}
+and no recursion happens.
+The top @var{music} is processed using @var{init} for @samp{previous}."
+ (let loop ((music music) (previous init))
+ (if (pred? music)
+ (proc music previous)
+ (fold loop
+ (fold loop
+ (let ((elt (ly:music-property music 'element)))
+ (if (null? elt)
+ previous
+ (loop elt previous)))
+ (ly:music-property music 'elements))
+ (ly:music-property music 'articulations)))))
+
(define-public (extract-music music pred?)
"Return a flat list of all music matching @var{pred?} inside of
@var{music}, not recursing into matches themselves."
- (reverse!
- (let loop ((music music) (res '()))
- (if (pred? music)
- (cons music res)
- (fold loop
- (fold loop
- (let ((elt (ly:music-property music 'element)))
- (if (null? elt)
- res
- (loop elt res)))
- (ly:music-property music 'elements))
- (ly:music-property music 'articulations))))))
+ (reverse! (fold-some-music pred? cons '() music)))
(define-public (extract-named-music music music-name)
"Return a flat list of all music named @var{music-name} (either a