1 %%%% -*- Mode: Scheme -*-
3 %%%% This file is part of LilyPond, the GNU music typesetter.
5 %%%% Copyright (C) 2003--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
6 %%%% Jan Nieuwenhuizen <janneke@gnu.org>
8 %%%% LilyPond is free software: you can redistribute it and/or modify
9 %%%% it under the terms of the GNU General Public License as published by
10 %%%% the Free Software Foundation, either version 3 of the License, or
11 %%%% (at your option) any later version.
13 %%%% LilyPond is distributed in the hope that it will be useful,
14 %%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
15 %%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 %%%% GNU General Public License for more details.
18 %%%% You should have received a copy of the GNU General Public License
19 %%%% along with LilyPond. If not, see <http://www.gnu.org/licenses/>.
24 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
25 %% this file is alphabetically sorted.
26 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
28 %% need SRFI-1 for filter; optargs for lambda*
29 #(use-modules (srfi srfi-1)
32 %% TODO: using define-music-function in a .scm causes crash.
35 #(def-grace-function startAcciaccaturaMusic stopAcciaccaturaMusic
36 (_i "Create an acciaccatura from the following music expression"))
38 %% keep these two together
39 "instrument-definitions" = #'()
40 addInstrumentDefinition =
41 #(define-music-function
42 (parser location name lst) (string? list?)
43 (_i "Create instrument @var{name} with properties @var{list}.")
44 (set! instrument-definitions (acons name lst instrument-definitions))
45 (make-music 'SequentialMusic 'void #t))
48 #(define-music-function (parser location name music) (string? ly:music?)
49 (_i "Define @var{music} as a quotable music expression named
51 (add-quotable parser name music)
52 (make-music 'SequentialMusic 'void #t))
54 %% keep these two together
55 afterGraceFraction = #(cons 6 8)
57 #(define-music-function (parser location main grace) (ly:music? ly:music?)
58 (_i "Create @var{grace} note(s) after a @var{main} music expression.")
59 (let ((main-length (ly:music-length main))
60 (fraction (ly:parser-lookup parser 'afterGraceFraction)))
61 (make-simultaneous-music
64 (make-sequential-music
67 (make-music 'SkipMusic
68 'duration (ly:make-duration
70 (* (ly:moment-main-numerator main-length)
72 (* (ly:moment-main-denominator main-length)
74 (make-music 'GraceMusic
78 %% music identifiers not allowed at top-level,
79 %% so this is a music-function instead.
81 #(define-music-function (location parser) ()
82 (_i "Allow a page turn. May be used at toplevel (ie between scores or
83 markups), or inside a score.")
84 (make-music 'EventChord
86 'page-turn-permission 'allow
87 'elements (list (make-music 'PageTurnEvent
88 'break-permission 'allow))))
91 #(define-music-function (parser location proc) (procedure?)
92 (_i "Modify context properties with Scheme procedure @var{proc}.")
93 (make-music 'ApplyContext
98 #(define-music-function (parser location func music) (procedure? ly:music?)
99 (_i"Apply procedure @var{func} to @var{music}.")
103 #(define-music-function (parser location ctx proc) (symbol? procedure?)
104 (_i "Apply function @code{proc} to every layout object in context @code{ctx}")
105 (make-music 'ApplyOutputEvent
111 #(def-grace-function startAppoggiaturaMusic stopAppoggiaturaMusic
112 (_i "Create an appoggiatura from @var{music}"))
114 % for regression testing purposes.
116 #(define-music-function (parser location l r) (pair? pair?)
117 (_i "Testing function: check whether the beam quants @var{l} and @var{r} are correct")
118 (make-grob-property-override 'Beam 'positions
119 (ly:make-simple-closure
120 (ly:make-simple-closure
122 (list chain-grob-member-functions `(,cons 0 0))
123 (check-quant-callbacks l r))))))
125 % for regression testing purposes.
127 #(define-music-function (parser location comp) (procedure?)
128 (_i "Testing function: check whether the slope of the beam is the same as @code{comp}")
129 (make-grob-property-override 'Beam 'positions
130 (ly:make-simple-closure
131 (ly:make-simple-closure
133 (list chain-grob-member-functions `(,cons 0 0))
134 (check-slope-callbacks comp))))))
137 #(define-music-function (parser location music) (ly:music?)
138 (_i "Make voices that switch between staves automatically")
139 (make-autochange-music parser music))
144 #(define-music-function (parser location grob-name offset text)
145 (symbol? number-pair? markup?)
146 (_i "Attach @var{text} to @var{grob-name} at offset @var{offset}
147 (use like @code{\\once})")
148 (make-music 'AnnotateOutputEvent
150 'X-offset (car offset)
151 'Y-offset (cdr offset)
155 #(define-music-function (parser location offset text) (number-pair? markup?)
156 (_i "Attach @var{text} at @var{offset} (use like @code{\\tweak})")
157 (make-music 'AnnotateOutputEvent
158 'X-offset (car offset)
159 'Y-offset (cdr offset)
163 #(define-music-function (parser location type) (string?)
164 (_i "Insert a bar line of type @var{type}")
166 (make-property-set 'whichBar type)
170 #(define-music-function (parser location n) (integer?)
171 (_i "Print a warning if the current bar number is not @var{n}.")
172 (make-music 'ApplyContext
176 (let ((cbn (ly:context-property c 'currentBarNumber)))
177 (if (and (number? cbn) (not (= cbn n)))
178 (ly:input-message location
179 "Barcheck failed got ~a expect ~a"
183 #(define-music-function (parser location delta) (real?)
184 (_i "Create a fall or doit of pitch interval @var{delta}.")
185 (make-music 'BendAfterEvent
189 #(define-music-function (parser location newfilename) (string?)
190 (_i "Direct output for the current book block to @var{newfilename}.")
191 (set! book-filename newfilename)
192 (make-music 'SequentialMusic 'void #t))
195 #(define-music-function (parser location newsuffix) (string?)
196 (_i "Set the output filename suffix for the current book block to
198 (set! book-output-suffix newsuffix)
199 (make-music 'SequentialMusic 'void #t))
203 #(define-music-function (parser location) ()
204 (_i "Insert a breath mark.")
205 (make-music 'EventChord
207 'elements (list (make-music 'BreathingEvent))))
212 #(define-music-function (parser location type) (string?)
213 (_i "Set the current clef to @var{type}.")
214 (make-clef-set type))
217 #(define-music-function
218 (parser location what dir main-music) (string? ly:dir? ly:music?)
219 (_i "Insert contents of quote @var{what} corresponding to @var{main-music},
220 in a CueVoice oriented by @var{dir}.")
221 (make-music 'QuoteMusic
223 'quoted-context-type 'Voice
224 'quoted-context-id "cue"
225 'quoted-music-name what
226 'quoted-voice-direction dir
232 #(define-music-function (parser location music) (ly:music?)
233 (_i "Display the LilyPond input representation of @var{music}
236 (display-lily-music music parser)
240 #(define-music-function (parser location music) (ly:music?)
241 (_i "Display the internal representation of @var{music} to the console.")
243 (display-scheme-music music)
249 #(define-music-function (parser location music) (ly:music?)
250 (_i "Terminate the next spanner prematurely after exactly one note
251 without the need of a specific end spanner.")
252 (if (eq? (ly:music-property music 'name) 'EventChord)
253 (let* ((elts (ly:music-property music 'elements))
254 (start-span-evs (filter (lambda (ev)
255 (and (music-has-type ev 'span-event)
256 (equal? (ly:music-property ev 'span-direction)
261 (let ((c (music-clone m)))
262 (set! (ly:music-property c 'span-direction) STOP)
265 (end-ev-chord (make-music 'EventChord
266 'elements stop-span-evs))
267 (total (make-music 'SequentialMusic
268 'elements (list music
272 (ly:input-message location (_ "argument endSpanners is not an EventChord: ~a" music))))
277 #(define-music-function (parser location factor argument) (ly:moment? ly:music?)
278 (_i "Adjust durations of music in @var{argument} by rational @var{factor}.")
279 (let ((orig-duration (ly:music-length argument))
280 (multiplier (ly:make-moment 1 1)))
284 (if (and (eq? (ly:music-property mus 'name) 'EventChord)
285 (< 0 (ly:moment-main-denominator (ly:music-length mus))))
287 (ly:music-compress mus multiplier)
288 (set! multiplier (ly:moment-mul factor multiplier))))
294 (ly:moment-div orig-duration (ly:music-length argument)))
301 #(def-grace-function startGraceMusic stopGraceMusic
302 (_i "Insert @var{music} as grace notes."))
307 #(define-music-function
308 (parser location name) (string?)
309 (_i "Switch instrument to @var{name}, which must be predefined with
310 @code{\\addInstrumentDefinition}.")
311 (let* ((handle (assoc name instrument-definitions))
312 (instrument-def (if handle (cdr handle) '())))
315 (ly:input-message location "No such instrument: ~a" name))
317 (make-music 'SimultaneousMusic
329 #(define-music-function (parser location tag music) (symbol? ly:music?)
330 (_i "Include only elements of @var{music} that are tagged with @var{tag}.")
333 (let* ((tags (ly:music-property m 'tags))
334 (res (memq tag tags)))
341 #(define-music-function (parser location music) (ly:music?)
342 (_i "Remove cue notes from @var{music}.")
345 (if (and (string? (ly:music-property mus 'quoted-music-name))
346 (string=? (ly:music-property mus 'quoted-context-id "") "cue"))
347 (ly:music-property mus 'element)
354 #(define-music-function (parser location label) (symbol?)
355 (_i "Create @var{label} as a bookmarking label.")
356 (make-music 'EventChord
359 'elements (list (make-music 'LabelEvent
360 'page-label label))))
364 #(define-music-function (parser location str) (string?)
365 (_i "Select note names language.")
366 (let ((language (assoc-get (string->symbol str)
371 (if (ly:get-option 'verbose)
372 (ly:message (_ "Using ~a note names...") str))
373 (set! pitchnames language)
374 (ly:parser-set-note-names parser language))
375 (ly:warning (_ "Could not find language ~a. Ignoring.") str))
376 (make-music 'Music 'void #t)))
380 #(define-music-function (parser location arg) (ly:music?)
381 (_i "Display chords in @var{arg} as clusters.")
382 (music-map note-to-cluster arg))
385 #(define-music-function (parser location proc mus) (procedure? ly:music?)
386 (_i "Apply @var{proc} to @var{mus} and all of the music it contains.")
387 (music-map proc mus))
391 %% noPageBreak and noPageTurn are music functions (not music indentifiers),
392 %% because music identifiers are not allowed at top-level.
394 #(define-music-function (location parser) ()
395 (_i "Forbid a page break. May be used at toplevel (i.e., between scores or
396 markups), or inside a score.")
397 (make-music 'EventChord
399 'page-break-permission 'forbid
400 'elements (list (make-music 'PageBreakEvent
401 'break-permission '()))))
404 #(define-music-function (location parser) ()
405 (_i "Forbid a page turn. May be used at toplevel (i.e., between scores or
406 markups), or inside a score.")
407 (make-music 'EventChord
409 'page-turn-permission 'forbid
410 'elements (list (make-music 'PageTurnEvent
411 'break-permission '()))))
416 #(define-music-function (parser location pitch-note) (ly:music?)
418 (make-music 'RelativeOctaveCheck
420 'pitch (pitch-of-note pitch-note)))
423 #(define-music-function (parser location octave) (integer?)
424 (_i "Set the octavation.")
425 (make-music 'OttavaMusic
426 'ottava-number octave))
428 overrideTimeSignatureSettings =
429 #(define-music-function
430 (parser location context time-signature base-moment beat-structure beam-exceptions)
431 (symbol? pair? pair? cheap-list? cheap-list?)
433 (_i "Override @code{timeSignatureSettings} in @var{context}
434 for time signatures of @var{time-signature} to have settings
435 of @var{base-moment}, @var{beat-structure}, and @var{beam-exceptions}.")
437 ;; TODO -- add warning if largest value of grouping is
438 ;; greater than time-signature.
439 (let ((setting (make-setting base-moment beat-structure beam-exceptions)))
440 (override-time-signature-setting time-signature setting context)))
443 #(define-music-function (parser location name property value)
444 (string? symbol? scheme?)
446 (_i "Set @var{property} to @var{value} in all grobs named @var{name}.
447 The @var{name} argument is a string of the form @code{\"Context.GrobName\"}
448 or @code{\"GrobName\"}.")
450 (let ((name-components (string-split name #\.))
451 (context-name 'Bottom)
454 (if (> 2 (length name-components))
455 (set! grob-name (string->symbol (car name-components)))
457 (set! grob-name (string->symbol (list-ref name-components 1)))
458 (set! context-name (string->symbol (list-ref name-components 0)))))
460 (make-music 'ApplyOutputEvent
462 'context-type context-name
464 (lambda (grob orig-context context)
466 (cdr (assoc 'name (ly:grob-property grob 'meta)))
468 (set! (ly:grob-property grob property) value))))))
472 %% pageBreak and pageTurn are music functions (iso music indentifiers),
473 %% because music identifiers are not allowed at top-level.
475 #(define-music-function (location parser) ()
476 (_i "Force a page break. May be used at toplevel (i.e., between scores or
477 markups), or inside a score.")
478 (make-music 'EventChord
480 'line-break-permission 'force
481 'page-break-permission 'force
482 'elements (list (make-music 'LineBreakEvent
483 'break-permission 'force)
484 (make-music 'PageBreakEvent
485 'break-permission 'force))))
488 #(define-music-function (location parser) ()
489 (_i "Force a page turn between two scores or top-level markups.")
490 (make-music 'EventChord
492 'line-break-permission 'force
493 'page-break-permission 'force
494 'page-turn-permission 'force
495 'elements (list (make-music 'LineBreakEvent
496 'break-permission 'force)
497 (make-music 'PageBreakEvent
498 'break-permission 'force)
499 (make-music 'PageTurnEvent
500 'break-permission 'force))))
503 #(define-music-function (parser location voice-ids music) (list? ly:music?)
504 (_i "Define parallel music sequences, separated by '|' (bar check signs),
505 and assign them to the identifiers provided in @var{voice-ids}.
507 @var{voice-ids}: a list of music identifiers (symbols containing only letters)
509 @var{music}: a music sequence, containing BarChecks as limiting expressions.
514 \\parallelMusic #'(A B C) {
524 (let* ((voices (apply circular-list (make-list (length voice-ids) (list))))
525 (current-voices voices)
526 (current-sequence (list)))
529 (define (push-music m)
530 "Push the music expression into the current sequence"
531 (set! current-sequence (cons m current-sequence)))
532 (define (change-voice)
533 "Stores the previously built sequence into the current voice and
534 change to the following voice."
535 (list-set! current-voices 0 (cons (make-music 'SequentialMusic
536 'elements (reverse! current-sequence))
537 (car current-voices)))
538 (set! current-sequence (list))
539 (set! current-voices (cdr current-voices)))
540 (define (bar-check? m)
541 "Checks whether m is a bar check."
542 (eq? (ly:music-property m 'name) 'BarCheck))
543 (define (music-origin music)
544 "Recursively search an origin location stored in music."
545 (cond ((null? music) #f)
546 ((not (null? (ly:music-property music 'origin)))
547 (ly:music-property music 'origin))
548 (else (or (music-origin (ly:music-property music 'element))
549 (let ((origins (remove not (map music-origin
550 (ly:music-property music 'elements)))))
551 (and (not (null? origins)) (car origins)))))))
553 ;; first, split the music and fill in voices
554 (map-in-order (lambda (m)
556 (if (bar-check? m) (change-voice)))
557 (ly:music-property music 'elements))
558 (if (not (null? current-sequence)) (change-voice))
559 ;; un-circularize `voices' and reorder the voices
560 (set! voices (map-in-order (lambda (dummy seqs)
564 ;; set origin location of each sequence in each voice
565 ;; for better type error tracking
566 (for-each (lambda (voice)
567 (for-each (lambda (seq)
568 (set! (ly:music-property seq 'origin)
569 (or (music-origin seq) location)))
573 ;; check sequence length
574 (apply for-each (lambda* (#:rest seqs)
575 (let ((moment-reference (ly:music-length (car seqs))))
576 (for-each (lambda (seq moment)
577 (if (not (equal? moment moment-reference))
578 (ly:music-message seq
579 "Bars in parallel music don't have the same length")))
580 seqs (map-in-order ly:music-length seqs))))
583 ;; bind voice identifiers to the voices
584 (map (lambda (voice-id voice)
585 (ly:parser-define! parser voice-id
586 (make-music 'SequentialMusic
590 ;; Return an empty sequence. This function is actually a "void" function.
591 (make-music 'SequentialMusic 'void #t))
594 #(define-music-function (parser loc arg) (ly:music?)
595 (_i "Tag @var{arg} to be parenthesized.")
597 (if (memq 'event-chord (ly:music-property arg 'types))
598 ;; arg is an EventChord -> set the parenthesize property
599 ;; on all child notes and rests
602 (if (or (memq 'note-event (ly:music-property ev 'types))
603 (memq 'rest-event (ly:music-property ev 'types)))
604 (set! (ly:music-property ev 'parenthesize) #t)))
605 (ly:music-property arg 'elements))
606 ;; No chord, simply set property for this expression:
607 (set! (ly:music-property arg 'parenthesize) #t))
611 #(define-music-function (parser location part1 part2) (ly:music? ly:music?)
612 (_i "Take the music in @var{part1} and @var{part2} and typeset so
613 that they share a staff.")
614 (make-part-combine-music parser
617 #(define (symbol-or-boolean? x) (or (symbol? x) (boolean? x)))
619 #(define-music-function (location parser type once) (symbol-or-boolean? boolean?)
620 (_i "Override the part-combiner.")
621 (make-music 'EventChord
622 'elements (list (make-music 'PartCombineForceEvent
625 partcombineApart = \partcombineForce #'apart ##f
626 partcombineApartOnce = \partcombineForce #'apart ##t
627 partcombineChords = \partcombineForce #'chords ##f
628 partcombineChordsOnce = \partcombineForce #'chords ##t
629 partcombineUnisono = \partcombineForce #'unisono ##f
630 partcombineUnisonoOnce = \partcombineForce #'unisono ##t
631 partcombineSoloI = \partcombineForce #'solo1 ##f
632 partcombineSoloIOnce = \partcombineForce #'solo1 ##t
633 partcombineSoloII = \partcombineForce #'solo2 ##f
634 partcombineSoloIIOnce = \partcombineForce #'solo2 ##t
635 partcombineAutomatic = \partcombineForce ##f ##f
636 partcombineAutomaticOnce = \partcombineForce ##f ##t
640 #(define-music-function
641 (parser location main-note secondary-note)
642 (ly:music? ly:music?)
643 (_i "Print a trill with @var{main-note} as the main note of the trill and
644 print @var{secondary-note} as a stemless note head in parentheses.")
645 (let* ((get-notes (lambda (ev-chord)
647 (lambda (m) (eq? 'NoteEvent (ly:music-property m 'name)))
648 (ly:music-property ev-chord 'elements))))
649 (sec-note-events (get-notes secondary-note))
650 (trill-events (filter (lambda (m) (music-has-type m 'trill-span-event))
651 (ly:music-property main-note 'elements))))
653 (if (pair? sec-note-events)
655 (let* ((trill-pitch (ly:music-property (car sec-note-events) 'pitch))
656 (forced (ly:music-property (car sec-note-events) 'force-accidental)))
658 (if (ly:pitch? trill-pitch)
659 (for-each (lambda (m)
660 (ly:music-set-property! m 'pitch trill-pitch)) trill-events)
662 (ly:warning (_ "Second argument of \\pitchedTrill should be single note: "))
663 (display sec-note-events)))
666 (for-each (lambda (m)
667 (ly:music-set-property! m 'force-accidental forced))
672 #(define-music-function (parser location what main-music) (string? ly:music?)
673 (_i "Indicate a section of music to be quoted. @var{what} indicates the name
674 of the quoted voice, as specified in an @code{\\addQuote} command.
675 @var{main-music} is used to indicate the length of music to be quoted;
676 usually contains spacers or multi-measure rests.")
677 (make-music 'QuoteMusic
679 'quoted-music-name what
683 #(define-music-function (parser location tag music) (symbol? ly:music?)
684 (_i "Remove elements of @var{music} that are tagged with @var{tag}.")
687 (let* ((tags (ly:music-property m 'tags))
688 (res (memq tag tags)))
692 resetRelativeOctave =
693 #(define-music-function (parser location reference-note) (ly:music?)
694 (_i "Set the octave inside a \\relative section.")
696 (let* ((notes (ly:music-property reference-note 'elements))
697 (pitch (ly:music-property (car notes) 'pitch)))
699 (set! (ly:music-property reference-note 'elements) '())
700 (set! (ly:music-property reference-note 'to-relative-callback)
701 (lambda (music last-pitch)
706 revertTimeSignatureSettings =
707 #(define-music-function
708 (parser location context time-signature)
711 (_i "Revert @code{timeSignatureSettings} in @var{context}
712 for time signatures of @var{time-signature}.")
713 (revert-time-signature-setting time-signature context))
716 #(define-music-function (parser location finger) (number-or-string?)
717 (_i "Apply @var{finger} as a fingering indication.")
726 (list 'digit finger)))))
731 #(define-music-function (parser location fraction music)
732 (number-pair? ly:music?)
733 (_i "Multiply the duration of events in @var{music} by @var{fraction}.")
734 (ly:music-compress music
735 (ly:make-moment (car fraction) (cdr fraction))))
738 #(define-music-function (parser location dur dots arg)
739 (integer? integer? ly:music?)
740 (_i "Scale @var{arg} up by a factor of @var{2^dur*(2-(1/2)^dots)}.")
744 (shift-one-duration-log x dur dots)) arg))
747 #(define-music-function (parser location parameters) (list?)
748 (_i "Set the system stretch, by reading the 'system-stretch property of
749 the `parameters' assoc list.")
751 \overrideProperty #"Score.NonMusicalPaperColumn"
752 #'line-break-system-details
753 #$(list (cons 'alignment-extra-space (cdr (assoc 'system-stretch parameters)))
754 (cons 'system-Y-extent (cdr (assoc 'system-Y-extent parameters))))
758 #(define-music-function (parser location style heads music)
759 (symbol? list-or-symbol? ly:music?)
760 (_i "Set @var{heads} in @var{music} to @var{style}.")
761 (style-note-heads heads style music))
766 #(define-music-function (parser location) ()
767 (_i "Include the string information in a chord repetition.")
768 (ly:parser-set-repetition-function parser tab-repeat-chord)
769 (make-music 'SequentialMusic 'void #t))
772 #(define-music-function (parser location tag arg) (symbol? ly:music?)
774 (_i "Add @var{tag} to the @code{tags} property of @var{arg}.")
777 (ly:music-property arg 'tags)
779 (ly:music-property arg 'tags)))
782 transposedCueDuring =
783 #(define-music-function
784 (parser location what dir pitch-note main-music)
785 (string? ly:dir? ly:music? ly:music?)
787 (_i "Insert notes from the part @var{what} into a voice called @code{cue},
788 using the transposition defined by @var{pitch-note}. This happens
789 simultaneously with @var{main-music}, which is usually a rest. The
790 argument @var{dir} determines whether the cue notes should be notated
791 as a first or second voice.")
793 (make-music 'QuoteMusic
795 'quoted-context-type 'Voice
796 'quoted-context-id "cue"
797 'quoted-music-name what
798 'quoted-voice-direction dir
799 'quoted-transposition (pitch-of-note pitch-note)
803 #(define-music-function (parser location pitch-note) (ly:music?)
804 (_i "Set instrument transposition")
807 (make-property-set 'instrumentTransposition
808 (ly:pitch-negate (pitch-of-note pitch-note)))
812 #(define-music-function (parser location sym val arg)
813 (symbol? scheme? ly:music?)
814 (_i "Add @code{sym . val} to the @code{tweaks} property of @var{arg}.")
816 (if (equal? (object-property sym 'backend-type?) #f)
818 (ly:warning (_ "cannot find property type-check for ~a") sym)
819 (ly:warning (_ "doing assignment anyway"))))
821 (ly:music-property arg 'tweaks)
823 (ly:music-property arg 'tweaks)))
829 #(define-music-function (parser location music) (ly:music?)
830 (_i "Force any @code{\\repeat volta}, @code{\\repeat tremolo} or
831 @code{\\repeat percent} commands in @var{music} to be interpreted
832 as @code{\\repeat unfold}.")
833 (unfold-repeats music))
838 #(define-music-function (parser location sym val music)
839 (symbol? scheme? ly:music?)
840 (_i "Set @var{sym} to @var{val} in @var{music}.")
842 (set! (ly:music-property music sym) val)