ly/music-functions-init.ly

   1 %%%% This file is part of LilyPond, the GNU music typesetter.
   2 %%%%
   3 %%%% Copyright (C) 2003--2010 Han-Wen Nienhuys <hanwen@xs4all.nl>
   4 %%%%                          Jan Nieuwenhuizen <janneke@gnu.org>
   5 %%%%
   6 %%%% LilyPond is free software: you can redistribute it and/or modify
   7 %%%% it under the terms of the GNU General Public License as published by
   8 %%%% the Free Software Foundation, either version 3 of the License, or
   9 %%%% (at your option) any later version.
  10 %%%%
  11 %%%% LilyPond is distributed in the hope that it will be useful,
  12 %%%% but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 %%%% MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 %%%% GNU General Public License for more details.
  15 %%%%
  16 %%%% You should have received a copy of the GNU General Public License
  17 %%%% along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18
  19 % -*-Scheme-*-
  20
  21 \version "2.12.0"
  22
  23
  24 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  25 %% this file is alphabetically sorted.
  26 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  27
  28 %% need SRFI-1 for filter; optargs for lambda*
  29 #(use-modules (srfi srfi-1)
  30               (ice-9 optargs))
  31
  32 %% TODO: using define-music-function in a .scm causes crash.
  33
  34 acciaccatura =
  35 #(def-grace-function startAcciaccaturaMusic stopAcciaccaturaMusic
  36    (_i "Create an acciaccatura from the following music expression"))
  37
  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))
  46
  47 addQuote =
  48 #(define-music-function (parser location name music) (string? ly:music?)
  49    (_i "Define @var{music} as a quotable music expression named
  50 @var{name}")
  51    (add-quotable parser name music)
  52    (make-music 'SequentialMusic 'void #t))
  53
  54 %% keep these two together
  55 afterGraceFraction = #(cons 6 8)
  56 afterGrace =
  57 #(define-music-function
  58   (parser location main grace)
  59   (ly:music? ly:music?)
  60   (_i "Create @var{grace} note(s) after a @var{main} music expression.")
  61   (let*
  62       ((main-length (ly:music-length main))
  63        (fraction  (ly:parser-lookup parser 'afterGraceFraction)))
  64
  65     (make-simultaneous-music
  66      (list
  67       main
  68       (make-sequential-music
  69        (list
  70
  71         (make-music 'SkipMusic
  72                     'duration (ly:make-duration
  73                                0 0
  74                                (* (ly:moment-main-numerator main-length)
  75                                   (car fraction))
  76                                (* (ly:moment-main-denominator main-length)
  77                                   (cdr fraction)) ))
  78         (make-music 'GraceMusic
  79                     'element grace)))))))
  80
  81
  82 %% music identifiers not allowed at top-level,
  83 %% so this is a music-function instead.
  84 allowPageTurn =
  85 #(define-music-function (location parser) ()
  86    (_i "Allow a page turn. May be used at toplevel (ie between scores or
  87 markups), or inside a score.")
  88    (make-music 'EventChord
  89                'page-marker #t
  90                'page-turn-permission 'allow
  91                'elements (list (make-music 'PageTurnEvent
  92                                            'break-permission 'allow))))
  93
  94 applyContext =
  95 #(define-music-function (parser location proc) (procedure?)
  96   (_i "Modify context properties with Scheme procedure @var{proc}.")
  97   (make-music 'ApplyContext
  98               'origin location
  99               'procedure proc))
 100
 101 applyMusic =
 102 #(define-music-function (parser location func music) (procedure? ly:music?)
 103    (_i"Apply procedure @var{func} to @var{music}.")
 104   (func music))
 105
 106 applyOutput =
 107 #(define-music-function (parser location ctx proc) (symbol? procedure?)
 108   (_i "Apply function @code{proc} to every layout object in context @code{ctx}")
 109   (make-music 'ApplyOutputEvent
 110               'origin location
 111               'procedure proc
 112               'context-type ctx))
 113
 114 appoggiatura =
 115 #(def-grace-function startAppoggiaturaMusic stopAppoggiaturaMusic
 116   (_i "Create an appoggiatura from @var{music}"))
 117
 118 % for regression testing purposes.
 119 assertBeamQuant =
 120 #(define-music-function (parser location l r) (pair? pair?)
 121   (_i "Testing function: check whether the beam quants @var{l} and @var{r} are correct")
 122   (make-grob-property-override 'Beam 'positions
 123    (ly:make-simple-closure
 124     (ly:make-simple-closure
 125      (append
 126       (list chain-grob-member-functions `(,cons 0 0))
 127       (check-quant-callbacks l r))))))
 128
 129 % for regression testing purposes.
 130 assertBeamSlope =
 131 #(define-music-function (parser location comp) (procedure?)
 132   (_i "Testing function: check whether the slope of the beam is the same as @code{comp}")
 133   (make-grob-property-override 'Beam 'positions
 134    (ly:make-simple-closure
 135     (ly:make-simple-closure
 136      (append
 137       (list chain-grob-member-functions `(,cons 0 0))
 138       (check-slope-callbacks comp))))))
 139
 140 autochange =
 141 #(define-music-function (parser location music) (ly:music?)
 142   (_i "Make voices that switch between staves automatically")
 143   (make-autochange-music parser music))
 144
 145
 146
 147 balloonGrobText =
 148 #(define-music-function (parser location grob-name offset text)
 149                         (symbol? number-pair? markup?)
 150   (_i "Attach @var{text} to @var{grob-name} at offset @var{offset}
 151 use like @code{\\once})")
 152     (make-music 'AnnotateOutputEvent
 153                 'symbol grob-name
 154                 'X-offset (car offset)
 155                 'Y-offset (cdr offset)
 156                 'text text))
 157
 158 balloonText =
 159 #(define-music-function (parser location offset text) (number-pair? markup?)
 160   (_i "Attach @var{text} at @var{offset} (use like @code{\\tweak})")
 161     (make-music 'AnnotateOutputEvent
 162                 'X-offset (car offset)
 163                 'Y-offset (cdr offset)
 164                 'text text))
 165
 166 bar =
 167 #(define-music-function (parser location type) (string?)
 168   (_i "Insert a bar line of type @var{type}")
 169    (context-spec-music
 170     (make-property-set 'whichBar type)
 171     'Timing))
 172
 173 barNumberCheck =
 174 #(define-music-function (parser location n) (integer?)
 175   (_i "Print a warning if the current bar number is not @var{n}.")
 176    (make-music 'ApplyContext
 177                'origin location
 178                'procedure
 179                (lambda (c)
 180                  (let*
 181                      ((cbn (ly:context-property c 'currentBarNumber)))
 182                    (if (and  (number? cbn) (not (= cbn n)))
 183                        (ly:input-message location "Barcheck failed got ~a expect ~a"
 184                                          cbn n))))))
 185
 186 bendAfter =
 187 #(define-music-function (parser location delta) (real?)
 188   (_i "Create a fall or doit of pitch interval @var{delta}.")
 189   (make-music 'BendAfterEvent
 190               'delta-step delta))
 191
 192 bookOutputName =
 193 #(define-music-function (parser location newfilename) (string?)
 194   (_i "Direct output for the current book block to @var{newfilename}.")
 195   (set! book-filename newfilename)
 196   (make-music 'SequentialMusic 'void #t))
 197
 198 bookOutputSuffix =
 199 #(define-music-function (parser location newsuffix) (string?)
 200   (_i "Set the output filename suffix for the current book block to
 201 @var{newsuffix}.")
 202   (set! book-output-suffix newsuffix)
 203   (make-music 'SequentialMusic 'void #t))
 204
 205 %% why a function?
 206 breathe =
 207 #(define-music-function (parser location) ()
 208   (_i "Insert a breath mark.")
 209             (make-music 'EventChord
 210               'origin location
 211               'elements (list (make-music 'BreathingEvent))))
 212
 213
 214
 215 clef =
 216 #(define-music-function (parser location type) (string?)
 217   (_i "Set the current clef to @var{type}.")
 218    (make-clef-set type))
 219
 220 cueDuring =
 221 #(define-music-function
 222   (parser location what dir main-music) (string? ly:dir? ly:music?)
 223   (_i "Insert contents of quote @var{what} corresponding to @var{main-music},
 224 in a CueVoice oriented by @var{dir}.")
 225   (make-music 'QuoteMusic
 226               'element main-music
 227               'quoted-context-type 'Voice
 228               'quoted-context-id "cue"
 229               'quoted-music-name what
 230               'quoted-voice-direction dir
 231               'origin location))
 232
 233
 234
 235 displayLilyMusic =
 236 #(define-music-function (parser location music) (ly:music?)
 237   (_i "Display  the LilyPond input representation of @var{music}
 238 to the console.")
 239    (newline)
 240    (display-lily-music music parser)
 241    music)
 242
 243 displayMusic =
 244 #(define-music-function (parser location music) (ly:music?)
 245   (_i "Display the internal representation of @var{music} to the console.")
 246    (newline)
 247    (display-scheme-music music)
 248    music)
 249
 250
 251
 252 endSpanners =
 253 #(define-music-function (parser location music) (ly:music?)
 254   (_i "Terminate the next spanner prematurely after exactly one note without the need of a specific end spanner.")
 255    (if (eq? (ly:music-property music 'name) 'EventChord)
 256        (let*
 257            ((elts (ly:music-property music 'elements))
 258             (start-span-evs (filter (lambda (ev)
 259                                 (and (music-has-type ev 'span-event)
 260                                      (equal? (ly:music-property ev 'span-direction)
 261                                              START)))
 262                               elts))
 263             (stop-span-evs
 264              (map (lambda (m)
 265                     (let* ((c (music-clone m)))
 266                       (set! (ly:music-property c 'span-direction) STOP)
 267                       c))
 268                   start-span-evs))
 269             (end-ev-chord (make-music 'EventChord
 270                                       'elements stop-span-evs))
 271             (total (make-music 'SequentialMusic
 272                                'elements (list music
 273                                                end-ev-chord))))
 274          total)
 275
 276        (ly:input-message location (_ "argument endSpanners is not an EventChord: ~a" music))))
 277
 278
 279
 280 featherDurations=
 281 #(define-music-function (parser location factor argument) (ly:moment? ly:music?)
 282  (_i "Adjust durations of music in @var{argument} by rational @var{factor}. ")
 283    (let*
 284        ((orig-duration (ly:music-length argument))
 285         (multiplier (ly:make-moment 1 1)))
 286
 287      (music-map
 288       (lambda (mus)
 289         (if (and (eq? (ly:music-property mus 'name) 'EventChord)
 290                  (< 0 (ly:moment-main-denominator (ly:music-length mus))))
 291             (begin
 292               (ly:music-compress mus multiplier)
 293               (set! multiplier (ly:moment-mul factor multiplier)))
 294             )
 295         mus)
 296       argument)
 297
 298      (ly:music-compress
 299       argument
 300       (ly:moment-div orig-duration (ly:music-length argument)))
 301
 302      argument))
 303
 304
 305
 306 grace =
 307 #(def-grace-function startGraceMusic stopGraceMusic
 308    (_i "Insert @var{music} as grace notes."))
 309
 310
 311
 312 instrumentSwitch =
 313 #(define-music-function
 314    (parser location name) (string?)
 315    (_i "Switch instrument to @var{name}, which must be predefined with
 316 @code{\\addInstrumentDefinition}.")
 317    (let*
 318        ((handle  (assoc name instrument-definitions))
 319         (instrument-def (if handle (cdr handle) '()))
 320         )
 321
 322      (if (not handle)
 323          (ly:input-message location "No such instrument: ~a" name))
 324      (context-spec-music
 325       (make-music 'SimultaneousMusic
 326                   'elements
 327                   (map (lambda (kv)
 328                          (make-property-set
 329                           (car kv)
 330                           (cdr kv)))
 331                        instrument-def))
 332       'Staff)))
 333
 334
 335
 336 keepWithTag =
 337 #(define-music-function
 338   (parser location tag music) (symbol? ly:music?)
 339   (_i "Include only elements of @var{music} that are tagged with @var{tag}.")
 340   (music-filter
 341    (lambda (m)
 342     (let* ((tags (ly:music-property m 'tags))
 343            (res (memq tag tags)))
 344      (or
 345       (eq? tags '())
 346       res)))
 347    music))
 348
 349 killCues =
 350 #(define-music-function
 351    (parser location music)
 352    (ly:music?)
 353    (_i "Remove cue notes from @var{music}.")
 354    (music-map
 355     (lambda (mus)
 356       (if (and (string? (ly:music-property mus 'quoted-music-name))
 357                (string=? (ly:music-property mus 'quoted-context-id "") "cue"))
 358           (ly:music-property mus 'element)
 359           mus)) music))
 360
 361
 362
 363 label =
 364 #(define-music-function (parser location label) (symbol?)
 365    (_i "Create @var{label} as a bookmarking label")
 366    (make-music 'EventChord
 367                'page-marker #t
 368                'page-label label
 369                'elements (list (make-music 'LabelEvent
 370                                            'page-label label))))
 371
 372
 373
 374 makeClusters =
 375 #(define-music-function
 376                 (parser location arg) (ly:music?)
 377    (_i "Display chords in @var{arg} as clusters")
 378                 (music-map note-to-cluster arg))
 379
 380 musicMap =
 381 #(define-music-function (parser location proc mus) (procedure? ly:music?)
 382              (music-map proc mus))
 383
 384
 385
 386 %% noPageBreak and noPageTurn are music functions (not music indentifiers),
 387 %% because music identifiers are not allowed at top-level.
 388 noPageBreak =
 389 #(define-music-function (location parser) ()
 390    (_i "Forbid a page break. May be used at toplevel (ie between scores or
 391 markups), or inside a score.")
 392    (make-music 'EventChord
 393                'page-marker #t
 394                'page-break-permission 'forbid
 395                'elements (list (make-music 'PageBreakEvent
 396                                            'break-permission '()))))
 397
 398 noPageTurn =
 399 #(define-music-function (location parser) ()
 400    (_i "Forbid a page turn. May be used at toplevel (ie between scores or
 401 markups), or inside a score.")
 402    (make-music 'EventChord
 403                'page-marker #t
 404                'page-turn-permission 'forbid
 405                'elements (list (make-music 'PageTurnEvent
 406                                            'break-permission '()))))
 407
 408
 409
 410 octaveCheck =
 411 #(define-music-function (parser location pitch-note) (ly:music?)
 412    (_i "octave check")
 413
 414    (make-music 'RelativeOctaveCheck
 415                'origin location
 416                'pitch (pitch-of-note pitch-note)
 417            ))
 418
 419 ottava = #(define-music-function (parser location octave) (number?)
 420   (_i "set the octavation ")
 421   (make-ottava-set octave))
 422
 423 overrideBeamSettings =
 424 #(define-music-function
 425     (parser location
 426      context time-signature rule-type grouping-rule)
 427     (symbol? pair? symbol? pair?)
 428
 429  (_i "Override beamSettings in @var{context}
 430 for time signatures of @var{time-signature} and rules of type
 431 @var{rule-type} to have a grouping rule alist
 432 @var{grouping-rule}.
 433 @var{rule-type} can be @code{end} or @code{subdivide},
 434 with a potential future value of @code{begin}.
 435 @var{grouping-rule} is an alist of @var{(beam-type . grouping)}
 436 entries.  @var{grouping} is in units of @var{beam-type}.  If
 437 @var{beam-type} is @code{*}, grouping is in units of the denominator
 438 of @var{time-signature}.")
 439
 440  ;; TODO -- add warning if largest value of grouping is
 441  ;;         greater than time-signature.
 442
 443 #{
 444 #(override-beam-setting
 445   $time-signature $rule-type $grouping-rule $context)
 446 #})
 447
 448 overrideProperty =
 449 #(define-music-function (parser location name property value)
 450    (string? symbol? scheme?)
 451
 452    (_i "Set @var{property} to @var{value} in all grobs named @var{name}.
 453 The @var{name} argument is a string of the form @code{\"Context.GrobName\"}
 454 or @code{\"GrobName\"}")
 455
 456    (let*
 457        ((name-components (string-split name #\.))
 458         (context-name 'Bottom)
 459         (grob-name #f))
 460
 461      (if (> 2 (length name-components))
 462          (set! grob-name (string->symbol (car name-components)))
 463          (begin
 464            (set! grob-name (string->symbol (list-ref name-components 1)))
 465            (set! context-name (string->symbol (list-ref name-components 0)))))
 466
 467      (make-music 'ApplyOutputEvent
 468                  'origin location
 469                  'context-type context-name
 470                  'procedure
 471                  (lambda (grob orig-context context)
 472                    (if (equal?
 473                         (cdr (assoc 'name (ly:grob-property grob 'meta)))
 474                         grob-name)
 475                        (set! (ly:grob-property grob property) value))))))
 476
 477
 478
 479 %% pageBreak and pageTurn are music functions (iso music indentifiers),
 480 %% because music identifiers are not allowed at top-level.
 481 pageBreak =
 482 #(define-music-function (location parser) ()
 483    (_i "Force a page break. May be used at toplevel (i.e. between scores or
 484 markups), or inside a score.")
 485    (make-music 'EventChord
 486                'page-marker #t
 487                'line-break-permission 'force
 488                'page-break-permission 'force
 489                'elements (list (make-music 'LineBreakEvent
 490                                            'break-permission 'force)
 491                                (make-music 'PageBreakEvent
 492                                            'break-permission 'force))))
 493
 494 pageTurn =
 495 #(define-music-function (location parser) ()
 496    (_i "Force a page turn between two scores or top-level markups.")
 497    (make-music 'EventChord
 498                'page-marker #t
 499                'line-break-permission 'force
 500                'page-break-permission 'force
 501                'page-turn-permission 'force
 502                'elements (list (make-music 'LineBreakEvent
 503                                            'break-permission 'force)
 504                                (make-music 'PageBreakEvent
 505                                            'break-permission 'force)
 506                                (make-music 'PageTurnEvent
 507                                            'break-permission 'force))))
 508
 509 parallelMusic =
 510 #(define-music-function (parser location voice-ids music) (list? ly:music?)
 511   (_i "Define parallel music sequences, separated by '|' (bar check signs),
 512 and assign them to the identifiers provided in @var{voice-ids}.
 513
 514 @var{voice-ids}: a list of music identifiers (symbols containing only letters)
 515
 516 @var{music}: a music sequence, containing BarChecks as limiting expressions.
 517
 518 Example:
 519
 520 @verbatim
 521   \\parallelMusic #'(A B C) {
 522     c c | d d | e e |
 523     d d | e e | f f |
 524   }
 525 <==>
 526   A = { c c | d d | }
 527   B = { d d | e e | }
 528   C = { e e | f f | }
 529 @end verbatim
 530 ")
 531   (let* ((voices (apply circular-list (make-list (length voice-ids) (list))))
 532          (current-voices voices)
 533          (current-sequence (list)))
 534     ;;
 535     ;; utilities
 536     (define (push-music m)
 537       "Push the music expression into the current sequence"
 538       (set! current-sequence (cons m current-sequence)))
 539     (define (change-voice)
 540       "Stores the previously built sequence into the current voice and
 541        change to the following voice."
 542       (list-set! current-voices 0 (cons (make-music 'SequentialMusic
 543                                          'elements (reverse! current-sequence))
 544                                         (car current-voices)))
 545       (set! current-sequence (list))
 546       (set! current-voices (cdr current-voices)))
 547     (define (bar-check? m)
 548       "Checks whether m is a bar check."
 549       (eq? (ly:music-property m 'name) 'BarCheck))
 550     (define (music-origin music)
 551       "Recursively search an origin location stored in music."
 552       (cond ((null? music) #f)
 553             ((not (null? (ly:music-property music 'origin)))
 554              (ly:music-property music 'origin))
 555             (else (or (music-origin (ly:music-property music 'element))
 556                       (let ((origins (remove not (map music-origin
 557                                                       (ly:music-property music 'elements)))))
 558                         (and (not (null? origins)) (car origins)))))))
 559     ;;
 560     ;; first, split the music and fill in voices
 561     (map-in-order (lambda (m)
 562                     (push-music m)
 563                     (if (bar-check? m) (change-voice)))
 564                   (ly:music-property music 'elements))
 565     (if (not (null? current-sequence)) (change-voice))
 566     ;; un-circularize `voices' and reorder the voices
 567     (set! voices (map-in-order (lambda (dummy seqs)
 568                                  (reverse! seqs))
 569                                voice-ids voices))
 570     ;;
 571     ;; set origin location of each sequence in each voice
 572     ;; for better type error tracking
 573     (for-each (lambda (voice)
 574                 (for-each (lambda (seq)
 575                             (set! (ly:music-property seq 'origin)
 576                                   (or (music-origin seq) location)))
 577                           voice))
 578               voices)
 579     ;;
 580     ;; check sequence length
 581     (apply for-each (lambda* (#:rest seqs)
 582                       (let ((moment-reference (ly:music-length (car seqs))))
 583                         (for-each (lambda (seq moment)
 584                                     (if (not (equal? moment moment-reference))
 585                                         (ly:music-message seq
 586                                          "Bars in parallel music don't have the same length")))
 587                           seqs (map-in-order ly:music-length seqs))))
 588            voices)
 589    ;;
 590    ;; bind voice identifiers to the voices
 591    (map (lambda (voice-id voice)
 592           (ly:parser-define! parser voice-id
 593                              (make-music 'SequentialMusic
 594                                'origin location
 595                                'elements voice)))
 596         voice-ids voices))
 597  ;; Return an empty sequence. this function is actually a "void" function.
 598  (make-music 'SequentialMusic 'void #t))
 599
 600 parenthesize =
 601 #(define-music-function (parser loc arg) (ly:music?)
 602    (_i "Tag @var{arg} to be parenthesized.")
 603
 604    (if (memq 'event-chord (ly:music-property arg 'types))
 605      ; arg is an EventChord -> set the parenthesize property on all child notes and rests
 606      (map
 607        (lambda (ev)
 608          (if (or (memq 'note-event (ly:music-property ev 'types))
 609                  (memq 'rest-event (ly:music-property ev 'types)))
 610            (set! (ly:music-property ev 'parenthesize) #t)))
 611        (ly:music-property arg 'elements))
 612      ; No chord, simply set property for this expression:
 613      (set! (ly:music-property arg 'parenthesize) #t))
 614    arg)
 615
 616 partcombine =
 617 #(define-music-function (parser location part1 part2) (ly:music? ly:music?)
 618    (_i "Take the music in @var{part1} and @var{part2} and typeset so that they share a staff.")
 619    (make-part-combine-music parser
 620                             (list part1 part2)))
 621
 622 pitchedTrill =
 623 #(define-music-function
 624    (parser location main-note secondary-note)
 625    (ly:music? ly:music?)
 626    (_i "Print a trill with @var{main-note} as the main note of the trill and
 627 print @var{secondary-note} as a stemless note head in parentheses.")
 628    (let* ((get-notes (lambda (ev-chord)
 629                        (filter
 630                         (lambda (m) (eq? 'NoteEvent (ly:music-property m 'name)))
 631                         (ly:music-property ev-chord 'elements))))
 632           (sec-note-events (get-notes secondary-note))
 633           (trill-events (filter (lambda (m) (music-has-type m 'trill-span-event))
 634                                 (ly:music-property main-note 'elements))))
 635
 636      (if (pair? sec-note-events)
 637          (begin
 638            (let* ((trill-pitch (ly:music-property (car sec-note-events) 'pitch))
 639                   (forced (ly:music-property (car sec-note-events) 'force-accidental)))
 640
 641              (if (ly:pitch? trill-pitch)
 642                  (for-each (lambda (m)
 643                              (ly:music-set-property! m 'pitch trill-pitch)) trill-events)
 644                  (begin
 645                    (ly:warning (_ "Second argument of \\pitchedTrill should be single note: "))
 646                    (display sec-note-events)))
 647
 648              (if (eq? forced #t)
 649                  (for-each (lambda (m)
 650                              (ly:music-set-property! m 'force-accidental forced))
 651                            trill-events)))))
 652      main-note))
 653
 654 quoteDuring =
 655 #(define-music-function
 656    (parser location what main-music)
 657    (string? ly:music?)
 658    (_i "Indicate a section of music to be quoted.  @var{what} indicates the name
 659 of the quoted voice, as specified in an @code{\\addQuote} command.
 660 @var{main-music} is used to indicate the length of music to be quoted;
 661 usually contains spacers or multi-measure rests.")
 662    (make-music 'QuoteMusic
 663                'element main-music
 664                'quoted-music-name what
 665                'origin location))
 666
 667 removeWithTag =
 668 #(define-music-function
 669   (parser location tag music) (symbol? ly:music?)
 670   (_i "Remove elements of @var{music} that are tagged with @var{tag}.")
 671   (music-filter
 672    (lambda (m)
 673     (let* ((tags (ly:music-property m 'tags))
 674            (res (memq tag tags)))
 675      (not res)))
 676  music))
 677
 678 resetRelativeOctave =
 679 #(define-music-function
 680     (parser location reference-note)
 681     (ly:music?)
 682     (_i "Set the octave inside a \\relative section.")
 683
 684    (let*
 685     ((notes (ly:music-property reference-note 'elements))
 686      (pitch (ly:music-property (car notes) 'pitch)))
 687
 688     (set! (ly:music-property reference-note 'elements) '())
 689     (set! (ly:music-property reference-note
 690        'to-relative-callback)
 691        (lambda (music last-pitch)
 692         pitch))
 693
 694     reference-note))
 695
 696 revertBeamSettings =
 697 #(define-music-function
 698     (parser location
 699      context time-signature rule-type)
 700     (symbol? pair? symbol?)
 701
 702  (_i "Revert beam settings in @var{context} for time signatures of
 703 @var{time-signature} and groups of type
 704 @var{group-type}.  @var{group-type} can be @code{end}
 705 or @code{subdivide}.")
 706 #{
 707   #(revert-beam-setting $time-signature $rule-type $context)
 708 #})
 709
 710 rightHandFinger =
 711 #(define-music-function (parser location finger) (number-or-string?)
 712    (_i "Apply @var{finger} as a fingering indication.")
 713
 714    (apply make-music
 715           (append
 716            (list
 717             'StrokeFingerEvent
 718             'origin location)
 719            (if  (string? finger)
 720                 (list 'text finger)
 721                 (list 'digit finger)))))
 722
 723
 724
 725 scaleDurations =
 726 #(define-music-function (parser location fraction music) (number-pair? ly:music?)
 727    (_i "Multiply the duration of events in @var{music} by @var{fraction}.")
 728    (ly:music-compress music
 729                       (ly:make-moment (car fraction) (cdr fraction))))
 730
 731 setBeatGrouping =
 732 #(define-music-function (parser location grouping) (pair?)
 733    (_i "Set the beat grouping in the current time signature to
 734 @var{grouping}.")
 735    (define (default-group-setting c)
 736     (let* ((context-time-signature
 737             (ly:context-property c 'timeSignatureFraction))
 738            (time-signature (if (null? context-time-signature)
 739                                '(4 . 4)
 740                                context-time-signature)))
 741       (override-property-setting
 742        c
 743        'beamSettings
 744        (list time-signature 'end)
 745        (list  (cons '* grouping)))))
 746
 747    (context-spec-music
 748      (make-apply-context default-group-setting)
 749      'Score))
 750
 751 shiftDurations =
 752 #(define-music-function (parser location dur dots arg) (integer? integer? ly:music?)
 753    (_i "Scale @var{arg} up by a factor of @var{2^dur*(2-(1/2)^dots)}.")
 754
 755    (music-map
 756     (lambda (x)
 757       (shift-one-duration-log x dur dots)) arg))
 758
 759 spacingTweaks =
 760 #(define-music-function (parser location parameters) (list?)
 761    (_i "Set the system stretch, by reading the 'system-stretch property of
 762 the `parameters' assoc list.")
 763    #{
 764       \overrideProperty #"Score.NonMusicalPaperColumn"
 765         #'line-break-system-details
 766         #$(list (cons 'alignment-extra-space (cdr (assoc 'system-stretch parameters)))
 767                 (cons 'system-Y-extent (cdr (assoc 'system-Y-extent parameters))))
 768    #})
 769
 770 styledNoteHeads =
 771 #(define-music-function
 772    (parser location style heads music)
 773    (symbol? list-or-symbol? ly:music?)
 774    (_i "Set @var{heads} in @var{music} to @var{style}.")
 775    (style-note-heads heads style music))
 776
 777
 778
 779 tag =
 780 #(define-music-function (parser location tag arg)
 781    (symbol? ly:music?)
 782
 783    (_i "Add @var{tag} to the @code{tags} property of @var{arg}.")
 784
 785    (set!
 786     (ly:music-property arg 'tags)
 787     (cons tag
 788           (ly:music-property arg 'tags)))
 789    arg)
 790
 791 transposedCueDuring =
 792 #(define-music-function
 793   (parser location what dir pitch-note main-music)
 794   (string? ly:dir? ly:music? ly:music?)
 795
 796   (_i "Insert notes from the part @var{what} into a voice called @code{cue},
 797 using the transposition defined by @var{pitch-note}.  This happens
 798 simultaneously with @var{main-music}, which is usually a rest.  The
 799 argument @var{dir} determines whether the cue notes should be notated
 800 as a first or second voice.")
 801
 802   (make-music 'QuoteMusic
 803               'element main-music
 804               'quoted-context-type 'Voice
 805               'quoted-context-id "cue"
 806               'quoted-music-name what
 807               'quoted-voice-direction dir
 808               'quoted-transposition (pitch-of-note pitch-note)
 809               'origin location))
 810
 811 transposition =
 812 #(define-music-function (parser location pitch-note) (ly:music?)
 813    (_i "Set instrument transposition")
 814
 815    (context-spec-music
 816     (make-property-set 'instrumentTransposition
 817                        (ly:pitch-negate (pitch-of-note pitch-note)))
 818         'Staff))
 819
 820 tweak =
 821 #(define-music-function (parser location sym val arg)
 822    (symbol? scheme? ly:music?)
 823    (_i "Add @code{sym . val} to the @code{tweaks} property of @var{arg}.")
 824
 825    (if (equal? (object-property sym 'backend-type?) #f)
 826        (begin
 827          (ly:warning (_ "cannot find property type-check for ~a") sym)
 828          (ly:warning (_ "doing assignment anyway"))))
 829    (set!
 830     (ly:music-property arg 'tweaks)
 831     (acons sym val
 832            (ly:music-property arg 'tweaks)))
 833    arg)
 834
 835
 836
 837 unfoldRepeats =
 838 #(define-music-function (parser location music) (ly:music?)
 839    (_i "Force any @code{\\repeat volta}, @code{\\repeat tremolo} or
 840 @code{\\repeat percent} commands in @var{music} to be interpreted
 841 as @code{\\repeat unfold}.")
 842    (unfold-repeats music))
 843
 844
 845
 846 withMusicProperty =
 847 #(define-music-function (parser location sym val music) (symbol? scheme? ly:music?)
 848    (_i "Set @var{sym} to @var{val} in @var{music}.")
 849
 850    (set! (ly:music-property music sym) val)
 851    music)