X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=ly%2Fmusic-functions-init.ly;h=c8b0a84b18b886686fae3dc466e28c5879ed0cb0;hb=7cf608d94950fc22c3ec60a72a2efba69b8d396d;hp=2a3ece31bbdd5710ae4dcf1c5c35001cb61f92a1;hpb=24dae874aaf50790de3471e3fd916e0278c7a3ac;p=lilypond.git

diff --git a/ly/music-functions-init.ly b/ly/music-functions-init.ly
index 2a3ece31bb..c8b0a84b18 100644
--- a/ly/music-functions-init.ly
+++ b/ly/music-functions-init.ly
@@ -1,76 +1,777 @@
-\version "2.3.8"
+% -*-Scheme-*-
 
+\version "2.12.0"
 
-applymusic = #(def-music-function (location func music) (procedure? ly:music?)
-               (func music))
 
-oldaddlyrics = #(def-music-function (location music lyrics) (ly:music? ly:music?)
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
+%% this file is alphabetically sorted.
+%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
-              (make-music 'LyricCombineMusic 
-                          'origin location
-                          'elements (list music lyrics)))
+%% need SRFI-1 filter
 
-grace = #(def-grace-function startGraceMusic stopGraceMusic)
-acciaccatura = #(def-grace-function startAcciaccaturaMusic stopAcciaccaturaMusic)
-appoggiatura = #(def-grace-function startAppoggiaturaMusic stopAppoggiaturaMusic)
+#(use-modules (srfi srfi-1))
+
+acciaccatura =
+#(def-grace-function startAcciaccaturaMusic stopAcciaccaturaMusic
+   (_i "Create an acciaccatura from the following music expression"))
+
+addQuote =
+#(define-music-function (parser location name music) (string? ly:music?)
+   (_i "Define @var{music} as a quotable music expression named
+@var{name}")
+   (add-quotable parser name music)
+   (make-music 'SequentialMusic 'void #t))
+
+afterGraceFraction =
+#(cons 6 8)
 
-partcombine = #(def-music-function (location part1 part2) (ly:music? ly:music?)
-                (make-part-combine-music (list part1 part2)))
+afterGrace =
+#(define-music-function
+  (parser location main grace)
+  (ly:music? ly:music?)
+  (_i "Create @var{grace} note(s) after a @var{main} music expression.")
+  (let*
+      ((main-length (ly:music-length main))
+       (fraction  (ly:parser-lookup parser 'afterGraceFraction)))
 
-autochange = #(def-music-function (location music) (ly:music?)
-               (make-autochange-music music))
+    (make-simultaneous-music
+     (list
+      main
+      (make-sequential-music
+       (list
 
-applycontext = #(def-music-function (location proc) (procedure?)
-                 (make-music 'ApplyContext 
-                   'origin location
-                   'procedure proc))
+	(make-music 'SkipMusic
+		    'duration (ly:make-duration
+			       0 0
+			       (* (ly:moment-main-numerator main-length)
+				  (car fraction))
+			       (* (ly:moment-main-denominator main-length)
+				  (cdr fraction)) ))
+	(make-music 'GraceMusic
+		    'element grace)))))))
 
-applyoutput = #(def-music-function (location proc) (procedure?)
-                (make-music 'ApplyOutputEvent 
-                  'origin location
-                  'procedure proc))
+applyMusic =
+#(define-music-function (parser location func music) (procedure? ly:music?)
+   (_i"Apply procedure @var{func} to @var{music}.")
+  (func music))
 
-breathe = #(def-music-function (location) ()
-            (make-music 'EventChord 
+
+applyOutput =
+#(define-music-function (parser location ctx proc) (symbol? procedure?)
+  (_i "Apply function @code{proc} to every layout object in context @code{ctx}")
+  (make-music 'ApplyOutputEvent
               'origin location
-              'elements (list (make-music 'BreathingSignEvent))))
+              'procedure proc
+              'context-type ctx))
 
+appoggiatura =
+#(def-grace-function startAppoggiaturaMusic stopAppoggiaturaMusic
+  (_i "Create an appoggiatura from @var{music}"))
 
-unfoldrepeats = #(def-music-function (location music) (ly:music?)
-		  (unfold-repeats music))
 
-compressmusic = #(def-music-function
-		  (location fraction music) (number-pair? ly:music?)
-		  (ly:music-compress music (ly:make-moment (car fraction) (cdr fraction))))
+% for regression testing purposes.
+assertBeamQuant =
+#(define-music-function (parser location l r) (pair? pair?)
+  (_i "Testing function: check whether the beam quants @var{l} and @var{r} are correct")
+  (make-grob-property-override 'Beam 'positions
+   (ly:make-simple-closure
+    (ly:make-simple-closure
+     (append
+      (list chain-grob-member-functions `(,cons 0 0))
+      (check-quant-callbacks l r))))))
 
+% for regression testing purposes.
+assertBeamSlope =
+#(define-music-function (parser location comp) (procedure?)
+  (_i "Testing function: check whether the slope of the beam is the same as @code{comp}")
+  (make-grob-property-override 'Beam 'positions
+   (ly:make-simple-closure
+    (ly:make-simple-closure
+     (append
+      (list chain-grob-member-functions `(,cons 0 0))
+      (check-slope-callbacks comp))))))
 
-%% \mytag #'foo { ... } ==> OK
-%% c-\mytag #'foo ^4    ==> KO
-%{
-#(use-modules (srfi srfi-1))
-#(define-public (symbol-or-symbols? obj)
-  "Return #t iif obj is a symbol or a symbol list."
-  (or (symbol? obj)
-      (and (list? obj)
-           (null? (remove symbol? obj)))))
 
-mytag = #(def-music-function (location tagname music) (symbol-or-symbols? ly:music?)
-        (set! (ly:music-property music 'tags)
-              ((if (list? tagname) append cons) tagname (ly:music-property music 'tags)))
-        music)
-%}
 
-%{
+autochange =
+#(define-music-function (parser location music) (ly:music?)
+  (_i "Make voices that switch between staves automatically")
+  (make-autochange-music parser music))
+
+applyContext =
+#(define-music-function (parser location proc) (procedure?)
+  (_i "Modify context properties with Scheme procedure @var{proc}.")
+  (make-music 'ApplyContext
+              'origin location
+              'procedure proc))
+
+
+balloonGrobText =
+#(define-music-function (parser location grob-name offset text)
+                        (symbol? number-pair? markup?)
+  (_i "Attach @var{text} to @var{grob-name} at offset @var{offset}
+(use like @code{\\once})")
+    (make-music 'AnnotateOutputEvent
+		'symbol grob-name
+		'X-offset (car offset)
+		'Y-offset (cdr offset)
+		'text text))
+
+balloonText =
+#(define-music-function (parser location offset text) (number-pair? markup?)
+  (_i "Attach @var{text} at @var{offset} (use like @code{\\tweak})")
+    (make-music 'AnnotateOutputEvent
+		'X-offset (car offset)
+		'Y-offset (cdr offset)
+		'text text))
+
+
+bar =
+#(define-music-function (parser location type) (string?)
+  (_i "Insert a bar line of type @var{type}")
+   (context-spec-music
+    (make-property-set 'whichBar type)
+    'Timing))
+
+
+barNumberCheck =
+#(define-music-function (parser location n) (integer?)
+  (_i "Print a warning if the current bar number is not @var{n}.")
+   (make-music 'ApplyContext
+	       'origin location
+	       'procedure
+	       (lambda (c)
+		 (let*
+		     ((cbn (ly:context-property c 'currentBarNumber)))
+		   (if (and  (number? cbn) (not (= cbn n)))
+		       (ly:input-message location "Barcheck failed got ~a expect ~a"
+					 cbn n))))))
+
+
+bendAfter =
+#(define-music-function (parser location delta) (real?)
+  (_i "Create a fall or doit of pitch interval @var{delta}.")
+  (make-music 'BendAfterEvent
+   'delta-step delta))
+
+%% why a function?
+breathe =
+#(define-music-function (parser location) ()
+  (_i "Insert a breath mark.")
+            (make-music 'EventChord
+              'origin location
+              'elements (list (make-music 'BreathingEvent))))
+
+
+clef =
+#(define-music-function (parser location type) (string?)
+  (_i "Set the current clef to @var{type}.")
+   (make-clef-set type))
+
+
+cueDuring =
+#(define-music-function
+  (parser location what dir main-music) (string? ly:dir? ly:music?)
+  (_i "Insert contents of quote @var{what} corresponding to @var{main-music},
+in a CueVoice oriented by @var{dir}.")
+  (make-music 'QuoteMusic
+	      'element main-music
+	      'quoted-context-type 'Voice
+	      'quoted-context-id "cue"
+	      'quoted-music-name what
+	      'quoted-voice-direction dir
+	      'origin location))
+
+displayLilyMusic =
+#(define-music-function (parser location music) (ly:music?)
+  (_i "Display  the LilyPond input representation of @var{music}
+to the console.")
+   (newline)
+   (display-lily-music music parser)
+   music)
+
+displayMusic =
+#(define-music-function (parser location music) (ly:music?)
+  (_i "Display the internal representation of @var{music} to the console.")
+   (newline)
+   (display-scheme-music music)
+   music)
+
+
+endSpanners =
+#(define-music-function (parser location music) (ly:music?)
+  (_i "Terminate the next spanner prematurely after exactly one note without the need of a specific end spanner.")
+   (if (eq? (ly:music-property music 'name) 'EventChord)
+       (let*
+	   ((elts (ly:music-property music 'elements))
+	    (start-span-evs (filter (lambda (ev)
+				(and (music-has-type ev 'span-event)
+				     (equal? (ly:music-property ev 'span-direction)
+					     START)))
+			      elts))
+	    (stop-span-evs
+	     (map (lambda (m)
+		    (let* ((c (music-clone m)))
+		      (set! (ly:music-property c 'span-direction) STOP)
+		      c))
+		  start-span-evs))
+	    (end-ev-chord (make-music 'EventChord
+				      'elements stop-span-evs))
+	    (total (make-music 'SequentialMusic
+			       'elements (list music
+					       end-ev-chord))))
+	 total)
+
+       (ly:input-message location (_ "argument endSpanners is not an EventChord: ~a" music))))
+
+featherDurations=
+#(define-music-function (parser location factor argument) (ly:moment? ly:music?)
+ (_i "Adjust durations of music in @var{argument} by rational @var{factor}. ")
+   (let*
+       ((orig-duration (ly:music-length argument))
+	(multiplier (ly:make-moment 1 1)))
+
+     (music-map
+      (lambda (mus)
+	(if (and (eq? (ly:music-property mus 'name) 'EventChord)
+		 (< 0 (ly:moment-main-denominator (ly:music-length mus))))
+	    (begin
+	      (ly:music-compress mus multiplier)
+	      (set! multiplier (ly:moment-mul factor multiplier)))
+	    )
+	mus)
+      argument)
+
+     (ly:music-compress
+      argument
+      (ly:moment-div orig-duration (ly:music-length argument)))
+
+     argument))
+
+grace =
+#(def-grace-function startGraceMusic stopGraceMusic
+   (_i "Insert @var{music} as grace notes."))
+
+"instrument-definitions" = #'()
+
+addInstrumentDefinition =
+#(define-music-function
+   (parser location name lst) (string? list?)
+   (_i "Create instrument @var{name} with properties @var{list}.")
+   (set! instrument-definitions (acons name lst instrument-definitions))
+
+   (make-music 'SequentialMusic 'void #t))
+
+
+instrumentSwitch =
+#(define-music-function
+   (parser location name) (string?)
+   (_i "Switch instrument to @var{name}, which must be predefined with
+@code{\\addInstrumentDefinition}.")
+   (let*
+       ((handle  (assoc name instrument-definitions))
+	(instrument-def (if handle (cdr handle) '()))
+	)
+
+     (if (not handle)
+	 (ly:input-message "No such instrument: ~a" name))
+     (context-spec-music
+      (make-music 'SimultaneousMusic
+		  'elements
+		  (map (lambda (kv)
+			 (make-property-set
+			  (car kv)
+			  (cdr kv)))
+		       instrument-def))
+      'Staff)))
+
+
+%% Parser used to read page-layout file, and then retreive score tweaks.
+#(define page-layout-parser #f)
+
+includePageLayoutFile =
+#(define-music-function (parser location) ()
+   (_i "Include the file @var{<basename>-page-layout.ly}. Deprecated as
+part of two-pass spacing.")
+   (if (not (ly:get-option 'dump-tweaks))
+       (let ((tweak-filename (format #f "~a-page-layout.ly"
+				     (ly:parser-output-name parser))))
+	 (if (access? tweak-filename R_OK)
+	     (begin
+	       (ly:message "Including tweak file ~a" tweak-filename)
+               (set! page-layout-parser (ly:parser-clone parser))
+	       (ly:parser-parse-string page-layout-parser
+                                       (format #f "\\include \"~a\""
+                                               tweak-filename))))))
+   (make-music 'SequentialMusic 'void #t))
+
+keepWithTag =
+#(define-music-function
+  (parser location tag music) (symbol? ly:music?)
+  (_i "Include only elements of @var{music} that are tagged with @var{tag}.")
+  (music-filter
+   (lambda (m)
+    (let* ((tags (ly:music-property m 'tags))
+           (res (memq tag tags)))
+     (or
+      (eq? tags '())
+      res)))
+   music))
+
+removeWithTag =
+#(define-music-function
+  (parser location tag music) (symbol? ly:music?)
+  (_i "Remove elements of @var{music} that are tagged with @var{tag}.")
+  (music-filter
+   (lambda (m)
+    (let* ((tags (ly:music-property m 'tags))
+           (res (memq tag tags)))
+     (not res)))
+ music))
+
+killCues =
+#(define-music-function
+   (parser location music)
+   (ly:music?)
+   (_i "Remove cue notes from @var{music}.")
+   (music-map
+    (lambda (mus)
+      (if (string? (ly:music-property mus 'quoted-music-name))
+	  (ly:music-property mus 'element)
+	  mus)) music))
+
+label =
+#(define-music-function (parser location label) (symbol?)
+   (_i "Create @var{label} as a bookmarking label")
+   (make-music 'EventChord
+	       'page-marker #t
+	       'page-label label
+	       'elements (list (make-music 'LabelEvent
+					   'page-label label))))
+
+makeClusters =
+#(define-music-function
+		(parser location arg) (ly:music?)
+   (_i "Display chords in @var{arg} as clusters")
+		(music-map note-to-cluster arg))
+
+musicMap =
+#(define-music-function (parser location proc mus) (procedure? ly:music?)
+	     (music-map proc mus))
+
+
+overrideProperty =
+#(define-music-function (parser location name property value)
+   (string? symbol? scheme?)
+
+   (_i "Set @var{property} to @var{value} in all grobs named @var{name}.
+The @var{name} argument is a string of the form @code{\"Context.GrobName\"}
+or @code{\"GrobName\"}")
+
+   (let*
+       ((name-components (string-split name #\.))
+	(context-name 'Bottom)
+	(grob-name #f))
+
+     (if (> 2 (length name-components))
+	 (set! grob-name (string->symbol (car name-components)))
+	 (begin
+	   (set! grob-name (string->symbol (list-ref name-components 1)))
+	   (set! context-name (string->symbol (list-ref name-components 0)))))
+
+     (make-music 'ApplyOutputEvent
+		 'origin location
+		 'context-type context-name
+		 'procedure
+		 (lambda (grob orig-context context)
+		   (if (equal?
+			(cdr (assoc 'name (ly:grob-property grob 'meta)))
+			grob-name)
+		       (set! (ly:grob-property grob property) value))))))
+
+%% These are music functions (iso music indentifiers), because music identifiers
+%% are not allowed at top-level.
+pageBreak =
+#(define-music-function (location parser) ()
+   (_i "Force a page break. May be used at toplevel (ie between scores or
+markups), or inside a score.")
+   (make-music 'EventChord
+	       'page-marker #t
+	       'line-break-permission 'force
+	       'page-break-permission 'force
+	       'elements (list (make-music 'LineBreakEvent
+					   'break-permission 'force)
+			       (make-music 'PageBreakEvent
+					   'break-permission 'force))))
+
+noPageBreak =
+#(define-music-function (location parser) ()
+   (_i "Forbid a page break. May be used at toplevel (ie between scores or
+markups), or inside a score.")
+   (make-music 'EventChord
+	       'page-marker #t
+	       'page-break-permission 'forbid
+	       'elements (list (make-music 'PageBreakEvent
+					   'break-permission '()))))
+
+pageTurn =
+#(define-music-function (location parser) ()
+   (_i "Force a page turn between two scores or top-level markups.")
+   (make-music 'EventChord
+	       'page-marker #t
+	       'line-break-permission 'force
+	       'page-break-permission 'force
+	       'page-turn-permission 'force
+	       'elements (list (make-music 'LineBreakEvent
+					   'break-permission 'force)
+			       (make-music 'PageBreakEvent
+					   'break-permission 'force)
+			       (make-music 'PageTurnEvent
+					   'break-permission 'force))))
+
+noPageTurn =
+#(define-music-function (location parser) ()
+   (_i "Forbid a page turn. May be used at toplevel (ie between scores or
+markups), or inside a score.")
+   (make-music 'EventChord
+	       'page-marker #t
+	       'page-turn-permission 'forbid
+	       'elements (list (make-music 'PageTurnEvent
+					   'break-permission '()))))
 
-TODO:
+allowPageTurn =
+#(define-music-function (location parser) ()
+   (_i "Allow a page turn. May be used at toplevel (ie between scores or
+markups), or inside a score.")
+   (make-music 'EventChord
+	       'page-marker #t
+	       'page-turn-permission 'allow
+	       'elements (list (make-music 'PageTurnEvent
+					   'break-permission 'allow))))
 
-remove these from the parser, and softcode here:
+%% Todo:
+%% doing
+%% define-music-function in a .scm causes crash.
+
+octaveCheck =
+#(define-music-function (parser location pitch-note) (ly:music?)
+   (_i "octave check")
+
+   (make-music 'RelativeOctaveCheck
+	       'origin location
+	       'pitch (pitch-of-note pitch-note)
+           ))
+
+ottava = #(define-music-function (parser location octave) (number?)
+  (_i "set the octavation ")
+  (make-ottava-set octave))
+
+partcombine =
+#(define-music-function (parser location part1 part2) (ly:music? ly:music?)
+                (make-part-combine-music parser
+					 (list part1 part2)))
+
+
+pitchedTrill =
+#(define-music-function
+   (parser location main-note secondary-note)
+   (ly:music? ly:music?)
+   (let*
+       ((get-notes (lambda (ev-chord)
+		     (filter
+		      (lambda (m) (eq? 'NoteEvent (ly:music-property m 'name)))
+		      (ly:music-property ev-chord 'elements))))
+	(sec-note-events (get-notes secondary-note))
+	(trill-events (filter (lambda (m) (music-has-type m 'trill-span-event))
+			      (ly:music-property main-note 'elements))))
+
+     (if (pair? sec-note-events)
+	 (begin
+	   (let*
+	       ((trill-pitch (ly:music-property (car sec-note-events) 'pitch))
+		(forced (ly:music-property (car sec-note-events ) 'force-accidental)))
+
+	     (if (ly:pitch? trill-pitch)
+		 (for-each (lambda (m) (ly:music-set-property! m 'pitch trill-pitch))
+			   trill-events)
+		 (begin
+		   (ly:warning (_ "Second argument of \\pitchedTrill should be single note: "))
+		   (display sec-note-events)))
+
+	     (if (eq? forced #t)
+		 (for-each (lambda (m) (ly:music-set-property! m 'force-accidental forced))
+			   trill-events)))))
+     main-note))
+
+
+
+%% for lambda*
+#(use-modules (ice-9 optargs))
+
+parallelMusic =
+#(define-music-function (parser location voice-ids music) (list? ly:music?)
+  (_i "Define parallel music sequences, separated by '|' (bar check signs),
+and assign them to the identifiers provided in @var{voice-ids}.
+
+@var{voice-ids}: a list of music identifiers (symbols containing only letters)
+
+@var{music}: a music sequence, containing BarChecks as limiting expressions.
+
+Example:
+
+@verbatim
+  \\parallelMusic #'(A B C) {
+    c c | d d | e e |
+    d d | e e | f f |
+  }
+<==>
+  A = { c c | d d | }
+  B = { d d | e e | }
+  C = { e e | f f | }
+@end verbatim
+")
+  (let* ((voices (apply circular-list (make-list (length voice-ids) (list))))
+         (current-voices voices)
+         (current-sequence (list)))
+    ;;
+    ;; utilities
+    (define (push-music m)
+      "Push the music expression into the current sequence"
+      (set! current-sequence (cons m current-sequence)))
+    (define (change-voice)
+      "Stores the previously built sequence into the current voice and
+       change to the following voice."
+      (list-set! current-voices 0 (cons (make-music 'SequentialMusic
+                                         'elements (reverse! current-sequence))
+                                        (car current-voices)))
+      (set! current-sequence (list))
+      (set! current-voices (cdr current-voices)))
+    (define (bar-check? m)
+      "Checks whether m is a bar check."
+      (eq? (ly:music-property m 'name) 'BarCheck))
+    (define (music-origin music)
+      "Recursively search an origin location stored in music."
+      (cond ((null? music) #f)
+            ((not (null? (ly:music-property music 'origin)))
+             (ly:music-property music 'origin))
+            (else (or (music-origin (ly:music-property music 'element))
+                      (let ((origins (remove not (map music-origin
+                                                      (ly:music-property music 'elements)))))
+                        (and (not (null? origins)) (car origins)))))))
+    ;;
+    ;; first, split the music and fill in voices
+    (map-in-order (lambda (m)
+                    (push-music m)
+                    (if (bar-check? m) (change-voice)))
+                  (ly:music-property music 'elements))
+    (if (not (null? current-sequence)) (change-voice))
+    ;; un-circularize `voices' and reorder the voices
+    (set! voices (map-in-order (lambda (dummy seqs)
+                                 (reverse! seqs))
+                               voice-ids voices))
+    ;;
+    ;; set origin location of each sequence in each voice
+    ;; for better type error tracking
+    (for-each (lambda (voice)
+                (for-each (lambda (seq)
+                            (set! (ly:music-property seq 'origin)
+                                  (or (music-origin seq) location)))
+                          voice))
+              voices)
+    ;;
+    ;; check sequence length
+    (apply for-each (lambda* (#:rest seqs)
+                      (let ((moment-reference (ly:music-length (car seqs))))
+                        (for-each (lambda (seq moment)
+                                    (if (not (equal? moment moment-reference))
+                                        (ly:music-message seq
+                                         "Bars in parallel music don't have the same length")))
+                          seqs (map-in-order ly:music-length seqs))))
+           voices)
+   ;;
+   ;; bind voice identifiers to the voices
+   (map (lambda (voice-id voice)
+          (ly:parser-define! parser voice-id
+                             (make-music 'SequentialMusic
+                               'origin location
+                               'elements voice)))
+        voice-ids voices))
+ ;; Return an empty sequence. this function is actually a "void" function.
+ (make-music 'SequentialMusic 'void #t))
+
+
+
+parenthesize =
+#(define-music-function (parser loc arg) (ly:music?)
+   (_i "Tag @var{arg} to be parenthesized.")
+
+   (if (memq 'event-chord (ly:music-property arg 'types))
+     ; arg is an EventChord -> set the parenthesize property on all child notes and rests
+     (map
+       (lambda (ev)
+         (if (or (memq 'note-event (ly:music-property ev 'types))
+                 (memq 'rest-event (ly:music-property ev 'types)))
+           (set! (ly:music-property ev 'parenthesize) #t)))
+       (ly:music-property arg 'elements))
+     ; No chord, simply set property for this expression:
+     (set! (ly:music-property arg 'parenthesize) #t))
+   arg)
+
+
+quoteDuring = #
+(define-music-function
+  (parser location what main-music)
+  (string? ly:music?)
+  (make-music 'QuoteMusic
+	      'element main-music
+	      'quoted-music-name what
+	      'origin location))
+
+
+
+resetRelativeOctave  =
+#(define-music-function
+    (parser location reference-note)
+    (ly:music?)
+    (_i "Set the octave inside a \\relative section.")
+
+   (let*
+    ((notes (ly:music-property reference-note 'elements))
+     (pitch (ly:music-property (car notes) 'pitch)))
+
+    (set! (ly:music-property reference-note 'elements) '())
+    (set! (ly:music-property reference-note
+       'to-relative-callback)
+       (lambda (music last-pitch)
+        pitch))
+
+    reference-note))
+
+
+scaleDurations =
+#(define-music-function (parser location fraction music) (number-pair? ly:music?)
+   (_i "Multiply the duration of events in @var{music} by @var{fraction}.")
+   (ly:music-compress music
+		      (ly:make-moment (car fraction) (cdr fraction))))
+
+
+
+shiftDurations =
+#(define-music-function (parser location dur dots arg) (integer? integer? ly:music?)
+   (_i "Scale @var{arg} up by a factor of @var{2^dur*(2-(1/2)^dots)}.")
+
+   (music-map
+    (lambda (x)
+      (shift-one-duration-log x dur dots)) arg))
+
+spacingTweaks =
+#(define-music-function (parser location parameters) (list?)
+   (_i "Set the system stretch, by reading the 'system-stretch property of
+the `parameters' assoc list.")
+   #{
+      \overrideProperty #"Score.NonMusicalPaperColumn"
+        #'line-break-system-details
+        #$(list (cons 'alignment-extra-space (cdr (assoc 'system-stretch parameters)))
+		(cons 'system-Y-extent (cdr (assoc 'system-Y-extent parameters))))
+   #})
+
+
+rightHandFinger =
+#(define-music-function (parser location finger) (number-or-string?)
+   (_i "Apply @var{finger} as a fingering indication.")
+
+   (apply make-music
+	  (append
+	   (list
+	    'StrokeFingerEvent
+	    'origin location)
+	   (if  (string? finger)
+		(list 'text finger)
+		(list 'digit finger)))))
+
+scoreTweak =
+#(define-music-function (parser location name) (string?)
+   (_i "Include the score tweak, if exists.")
+   (if (and page-layout-parser (not (ly:get-option 'dump-tweaks)))
+       (let ((tweak-music (ly:parser-lookup page-layout-parser
+                                            (string->symbol name))))
+         (if (ly:music? tweak-music)
+             tweak-music
+             (make-music 'SequentialMusic)))
+       (make-music 'SequentialMusic)))
+
+
+tag =
+#(define-music-function (parser location tag arg)
+   (symbol? ly:music?)
+
+   (_i "Add @var{tag} to the @code{tags} property of @var{arg}.")
+
+   (set!
+    (ly:music-property arg 'tags)
+    (cons tag
+	  (ly:music-property arg 'tags)))
+   arg)
+
+
+
+transposedCueDuring =
+#(define-music-function
+  (parser location what dir pitch-note main-music)
+  (string? ly:dir? ly:music? ly:music?)
+
+  (_i "Insert notes from the part @var{what} into a voice called @code{cue},
+using the transposition defined by @var{pitch-note}.  This happens
+simultaneously with @var{main-music}, which is usually a rest.  The
+argument @var{dir} determines whether the cue notes should be notated
+as a first or second voice.")
+
+  (make-music 'QuoteMusic
+	      'element main-music
+	      'quoted-context-type 'Voice
+	      'quoted-context-id "cue"
+	      'quoted-music-name what
+	      'quoted-voice-direction dir
+	      'quoted-transposition (pitch-of-note pitch-note)
+	      'origin location))
+
+
+
+transposition =
+#(define-music-function (parser location pitch-note) (ly:music?)
+   (_i "Set instrument transposition")
+
+   (context-spec-music
+    (make-property-set 'instrumentTransposition
+		       (ly:pitch-negate (pitch-of-note pitch-note)))
+        'Staff))
+
+tweak =
+#(define-music-function (parser location sym val arg)
+   (symbol? scheme? ly:music?)
+   (_i "Add @code{sym . val} to the @code{tweaks} property of @var{arg}.")
+
+   (if (equal? (object-property sym 'backend-type?) #f)
+       (begin
+	 (ly:warning (_ "cannot find property type-check for ~a") sym)
+	 (ly:warning (_ "doing assignment anyway"))))
+   (set!
+    (ly:music-property arg 'tweaks)
+    (acons sym val
+	   (ly:music-property arg 'tweaks)))
+   arg)
+
+
+
+unfoldRepeats =
+#(define-music-function (parser location music) (ly:music?)
+		  (unfold-repeats music))
 
- * \tag
 
-with small syntax changes, we could also do
 
- * \bar
- *  ?
+withMusicProperty =
+#(define-music-function (parser location sym val music) (symbol? scheme? ly:music?)
+   (_i "Set @var{sym} to @var{val} in @var{music}.")
 
-%}
+   (set! (ly:music-property music sym) val)
+   music)