X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=scm%2Fmusic-functions.scm;h=ff0e768c0a0e4a9f74a6e2635661b3179e19e1bc;hb=97d537aafa81497e8df9fdd5fb2808414876fb39;hp=b19cc5cf88315e3ce73e7208714809dd6493726c;hpb=322acc3c4bd05d0a9e952267d80246818514893a;p=lilypond.git

diff --git a/scm/music-functions.scm b/scm/music-functions.scm
index b19cc5cf88..ff0e768c0a 100644
--- a/scm/music-functions.scm
+++ b/scm/music-functions.scm
@@ -2,7 +2,7 @@
 ;;;;
 ;;;;  source file of the GNU LilyPond music typesetter
 ;;;; 
-;;;; (c)  1998--2004 Jan Nieuwenhuizen <janneke@gnu.org>
+;;;; (c) 1998--2006 Jan Nieuwenhuizen <janneke@gnu.org>
 ;;;;                 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 
 ;; (use-modules (ice-9 optargs)) 
@@ -16,10 +16,19 @@
   (make-procedure-with-setter ly:music-property
 			      ly:music-set-property!))
 
+(define-safe-public (music-is-of-type? mus type)
+  "Does @code{mus} belong to the music class @code{type}?"
+  (memq type (ly:music-property mus 'types)))
+
+;; TODO move this
 (define-public ly:grob-property
   (make-procedure-with-setter ly:grob-property
 			      ly:grob-set-property!))
 
+(define-public ly:prob-property
+  (make-procedure-with-setter ly:prob-property
+			      ly:prob-set-property!))
+
 (define-public (music-map function music)
   "Apply @var{function} to @var{music} and all of the music it contains.
 
@@ -81,10 +90,103 @@ First it recurses over the children, then the function is applied to MUSIC.
   (display " }\n")
   music)
 
+;;;
+;;; A scheme music pretty printer
+;;;
+(define (markup-expression->make-markup markup-expression)
+  "Transform `markup-expression' into an equivalent, hopefuly readable, scheme expression.
+For instance, 
+  \\markup \\bold \\italic hello
+==>
+  (markup #:line (#:bold (#:italic (#:simple \"hello\"))))"
+  (define (proc->command-keyword proc)
+    "Return a keyword, eg. `#:bold', from the `proc' function, eg. #<procedure bold-markup (layout props arg)>"
+    (let ((cmd-markup (symbol->string (procedure-name proc))))
+      (symbol->keyword (string->symbol (substring cmd-markup 0 (- (string-length cmd-markup)
+								  (string-length "-markup")))))))
+  (define (transform-arg arg)
+    (cond ((and (pair? arg) (markup? (car arg))) ;; a markup list
+	   (apply append (map inner-markup->make-markup arg)))
+	  ((and (not (string? arg)) (markup? arg)) ;; a markup
+	   (inner-markup->make-markup arg))
+	  (else					 ;; scheme arg
+	   arg)))
+  (define (inner-markup->make-markup mrkup)
+    (let ((cmd (proc->command-keyword (car mrkup)))
+	  (args (map transform-arg (cdr mrkup))))
+      `(,cmd ,@args)))
+  ;; body:
+  (if (string? markup-expression)
+      markup-expression
+      `(markup ,@(inner-markup->make-markup markup-expression))))
+
+(define-public (music->make-music obj)
+  "Generate a expression that, once evaluated, may return an object equivalent to `obj',
+that is, for a music expression, a (make-music ...) form."
+  (cond (;; markup expression
+	 (markup? obj)
+	 (markup-expression->make-markup obj))
+	(;; music expression
+	 (ly:music? obj)
+	 `(make-music 
+	   ',(ly:music-property obj 'name)
+	   ,@(apply append (map (lambda (prop)
+                                  `(',(car prop)
+				    ,(music->make-music (cdr prop))))
+                                (remove (lambda (prop)
+                                          (eqv? (car prop) 'origin))
+                                        (ly:music-mutable-properties obj))))))
+	(;; moment
+	 (ly:moment? obj)
+	 `(ly:make-moment ,(ly:moment-main-numerator obj)
+			  ,(ly:moment-main-denominator obj)
+			  ,(ly:moment-grace-numerator obj)
+			  ,(ly:moment-grace-denominator obj)))
+	(;; note duration
+	 (ly:duration? obj)
+	 `(ly:make-duration ,(ly:duration-log obj)
+			    ,(ly:duration-dot-count obj)
+			    ,(car (ly:duration-factor obj))
+			    ,(cdr (ly:duration-factor obj))))
+	(;; note pitch
+	 (ly:pitch? obj)
+	 `(ly:make-pitch ,(ly:pitch-octave obj)
+			 ,(ly:pitch-notename obj)
+			 ,(ly:pitch-alteration obj)))
+	(;; scheme procedure
+	 (procedure? obj)
+	 (or (procedure-name obj) obj))
+	(;; a symbol (avoid having an unquoted symbol)
+	 (symbol? obj)
+	 `',obj)
+	(;; an empty list (avoid having an unquoted empty list)
+	 (null? obj)
+	 `'())
+	(;; a proper list
+	 (list? obj)
+	 `(list ,@(map music->make-music obj)))
+	(;; a pair
+	 (pair? obj)
+	 `(cons ,(music->make-music (car obj)) 
+		,(music->make-music (cdr obj))))
+	(else
+	 obj)))
+
+(use-modules (ice-9 pretty-print))
+(define*-public (display-scheme-music obj #:optional (port (current-output-port)))
+  "Displays `obj', typically a music expression, in a friendly fashion,
+which often can be read back in order to generate an equivalent expression.
+
+Returns `obj'.
+"
+  (pretty-print (music->make-music obj) port)
+  (newline)
+  obj)
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
-(define (shift-one-duration-log music shift dot)
-  "  add SHIFT to ly:duration-log and optionally 
+(define-public (shift-one-duration-log music shift dot)
+  "  add SHIFT to duration-log of 'duration in music and optionally 
   a dot to any note encountered. This scales the music up by a factor 
   2^shift * (2 - (1/2)^dot)"
   (let ((d (ly:music-property music 'duration)))
@@ -97,12 +199,40 @@ First it recurses over the children, then the function is applied to MUSIC.
 	  (set! (ly:music-property music 'duration) nd)))
     music))
 
-
-
 (define-public (shift-duration-log music shift dot)
   (music-map (lambda (x) (shift-one-duration-log x shift dot))
 	     music))
 
+(define-public (make-repeat name times main alts)
+  "create a repeat music expression, with all properties initialized properly"
+  (let ((talts (if (< times (length alts))
+		   (begin
+		     (ly:warning (_ "More alternatives than repeats. Junking excess alternatives"))
+		     (take alts times))
+		   alts))
+	(r (make-repeated-music name)))
+    (set! (ly:music-property r 'element) main)
+    (set! (ly:music-property r 'repeat-count) (max times 1))
+    (set! (ly:music-property r 'elements) talts)
+    (if (equal? name "tremolo")
+	(let* ((dot? (zero? (modulo times 3)))
+	       (dots (if dot? 1 0))
+	       (mult (if dot?
+			 (quotient (* times 2) 3)
+			 times))
+	       (shift (- (ly:intlog2 mult))))
+	  
+	  (if (memq 'sequential-music (ly:music-property main 'types))
+	      ;; \repeat "tremolo" { c4 d4 }
+	      (let ((children (length (ly:music-property main 'elements))))
+		(if (not (= children 2))
+		    (ly:warning (_ "expecting 2 elements for chord tremolo, found ~a") children))
+		(ly:music-compress r (ly:make-moment 1 children))
+		(shift-duration-log r (1- shift) dots))
+	      ;; \repeat "tremolo" c4
+	      (shift-duration-log r shift dots)))
+	r)))
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; clusters.
 
@@ -123,15 +253,20 @@ First it recurses over the children, then the function is applied to MUSIC.
 (define-public (unfold-repeats music)
   "
 This function replaces all repeats  with unfold repeats. "
-  
+
   (let ((es (ly:music-property music 'elements))
 	(e  (ly:music-property music 'element))
-	(n  (ly:music-name music)))
-    (if (equal? n "Repeated_music")
-	(begin
-	  
-	  (if (equal? (ly:music-property music 'iterator-ctor)
-		      Chord_tremolo_iterator::constructor)
+	)
+    (if (memq 'repeated-music (ly:music-property music 'types))
+	(let*
+	    ((props (ly:music-mutable-properties music))
+	     (old-name (ly:music-property music 'name))
+	     (flattened  (flatten-alist props)))
+
+	  (set! music (apply make-music (cons 'UnfoldedRepeatedMusic
+					      flattened)))
+
+	  (if (equal? old-name 'TremoloRepeatedMusic)
 	      (let* ((seq-arg? (memq 'sequential-music
 				     (ly:music-property e 'types)))
 		     (count  (ly:music-property music 'repeat-count))
@@ -145,14 +280,9 @@ This function replaces all repeats  with unfold repeats. "
 					     (ly:intlog2 count)) dot-shift)
 		
 		(if seq-arg?
-		    (ly:music-compress e (ly:make-moment (length (ly:music-property e 'elements)) 1)))))
+		    (ly:music-compress e (ly:make-moment (length (ly:music-property
+								  e 'elements)) 1)))))))
 	  
-	  (set! (ly:music-property music 'length)
-		Repeated_music::unfolded_music_length)
-	  (set! (ly:music-property music 'start-moment-function)
-		Repeated_music::first_start)
-	  (set! (ly:music-property music 'iterator-ctor)
-		Unfolded_repeat_iterator::constructor)))
     
     (if (pair? es)
 	(set! (ly:music-property music 'elements)
@@ -184,14 +314,14 @@ i.e.  this is not an override"
 
 (define-public (make-grob-property-revert grob gprop)
   "Revert the grob property GPROP for GROB."
-  (make-music 'OverrideProperty
+  (make-music 'RevertProperty
 	      'symbol grob
 	      'grob-property gprop))
 
 (define direction-polyphonic-grobs
-  '(Stem Tie Rest Slur Script TextScript Dots DotColumn Fingering))
+  '(Stem Tie Rest Slur PhrasingSlur Script TextScript Dots DotColumn Fingering))
 
-(define-public (make-voice-props-set n)
+(define-safe-public (make-voice-props-set n)
   (make-sequential-music
    (append
     (map (lambda (x) (make-grob-property-set x 'direction
@@ -201,7 +331,7 @@ i.e.  this is not an override"
      (make-grob-property-set 'NoteColumn 'horizontal-shift (quotient n 2))
      (make-grob-property-set 'MultiMeasureRest 'staff-position (if (odd? n) -4 4)))))) 
 
-(define-public (make-voice-props-revert)
+(define-safe-public (make-voice-props-revert)
   (make-sequential-music
    (append
     (map (lambda (x) (make-grob-property-revert x 'direction))
@@ -210,7 +340,7 @@ i.e.  this is not an override"
     (list (make-grob-property-revert 'MultiMeasureRest 'staff-position)))))
 
 
-(define*-public (context-spec-music m context #:optional id)
+(define-safe-public (context-spec-music m context #:optional id)
   "Add \\context CONTEXT = ID to M. "
   (let ((cm (make-music 'ContextSpeccedMusic
 			'element m
@@ -241,7 +371,7 @@ i.e.  this is not an override"
   (make-music 'SimultaneousMusic
 	      'elements elts))
 
-(define-public (make-event-chord elts)
+(define-safe-public (make-event-chord elts)
   (make-music 'EventChord
 	      'elements elts))
 
@@ -257,43 +387,19 @@ i.e.  this is not an override"
 
 ;; mmrest
 (define-public (make-multi-measure-rest duration location)
-  (make-music 'MultiMeasureRestMusicGroup
+  (make-music 'MultiMeasureRestMusic
 	      'origin location
-	      'elements (list (make-music 'BarCheck
-					  'origin location)
-			      (make-event-chord (list (make-music 'MultiMeasureRestEvent
-								  'origin location
-								  'duration duration)))
-			      (make-music 'BarCheck
-					  'origin location))))
-
-(define-public (glue-mm-rest-texts music)
-  "Check if we have R1*4-\\markup { .. }, and if applicable convert to
-a property set for MultiMeasureRestNumber."
-  (define (script-to-mmrest-text script-music)
-    "Extract 'direction and 'text from SCRIPT-MUSIC, and transform into property sets."
-    (let ((dir (ly:music-property script-music 'direction))
-	  (p   (make-music 'MultiMeasureTextEvent
-			   'text (ly:music-property script-music 'text))))
-      (if (ly:dir? dir)
-	  (set! (ly:music-property p 'direction) dir))
-      p))
-  (if (eq? (ly:music-property music 'name) 'MultiMeasureRestMusicGroup)
-      (let* ((text? (lambda (x) (memq 'script-event (ly:music-property x 'types))))
-	     (es (ly:music-property  music 'elements))
-	     (texts (map script-to-mmrest-text	(filter text? es)))
-	     (others (remove text? es)))
-	(if (pair? texts)
-	    (set! (ly:music-property music 'elements)
-		  (cons (make-event-chord texts) others)))))
-  music)
-
+	      'duration duration))
 
 (define-public (make-property-set sym val)
   (make-music 'PropertySet
 	      'symbol sym
 	      'value val))
 
+(define-public (make-property-unset sym)
+  (make-music 'PropertyUnset
+	      'symbol sym))
+
 (define-public (make-ottava-set octavation)
   (let ((m (make-music 'ApplyContext)))
     (define (ottava-modify context)
@@ -327,6 +433,23 @@ OTTAVATION to `8va', or whatever appropriate."
 (define-public (make-time-signature-set num den . rest)
   "Set properties for time signature NUM/DEN.  Rest can contain a list
 of beat groupings "
+
+  (define (standard-beat-grouping num den)
+
+    "Some standard subdivisions for time signatures."
+    (let*
+	((key (cons num den))
+	 (entry (assoc key '(((6 . 8) . (3 3))
+			 ((5 . 8) . (3 2))
+			 ((9 . 8) . (3 3 3))
+			 ((12 . 8) . (3 3 3 3))
+			 ((8 . 8) . (3 3 2))
+			 ))))
+
+      (if entry
+	  (cdr entry)
+	  '())))    
+  
   (let* ((set1 (make-property-set 'timeSignatureFraction (cons num den)))
 	 (beat (ly:make-moment 1 den))
 	 (len  (ly:make-moment num den))
@@ -334,7 +457,7 @@ of beat groupings "
 	 (set3 (make-property-set 'measureLength len))
 	 (set4 (make-property-set 'beatGrouping (if (pair? rest)
 						    (car rest)
-						    '())))
+						    (standard-beat-grouping num den))))
 	 (basic	 (list set1 set2 set3 set4)))
     (descend-to-context
      (context-spec-music (make-sequential-music basic) 'Timing) 'Score)))
@@ -356,12 +479,7 @@ of beat groupings "
 (define-public (set-time-signature num den . rest)
   (ly:export (apply make-time-signature-set `(,num ,den . ,rest))))
 
-(define-public (make-penalty-music pen page-pen)
-  (make-music 'BreakEvent
-	      'penalty pen
-	      'page-penalty page-pen))
-
-(define-public (make-articulation name)
+(define-safe-public (make-articulation name)
   (make-music 'ArticulationEvent
 	      'articulation-type name))
 
@@ -370,7 +488,7 @@ of beat groupings "
 	      'duration duration
 	      'text string))
 
-(define-public (make-span-event type spandir)
+(define-safe-public (make-span-event type spandir)
   (make-music type
 	      'span-direction spandir))
 
@@ -386,7 +504,6 @@ of beat groupings "
   (let ((ts (ly:music-property m 'types)))
     (memq 'separator ts)))
 
-
 ;;; splitting chords into voices.
 (define (voicify-list lst number)
   "Make a list of Musics.
@@ -415,15 +532,15 @@ of beat groupings "
 (define-public (voicify-music m)
   "Recursively split chords that are separated with \\ "
   (if (not (ly:music? m))
-      (begin (display m)
-	     (error "not music!")))
+      (ly:error (_ "music expected: ~S") m))
   (let ((es (ly:music-property m 'elements))
 	(e (ly:music-property m 'element)))
+
     (if (pair? es)
 	(set! (ly:music-property m 'elements) (map voicify-music es)))
     (if (ly:music? e)
 	(set! (ly:music-property m 'element)  (voicify-music e)))
-    (if (and (equal? (ly:music-name m) "Simultaneous_music")
+    (if (and (equal? (ly:music-property m 'name) 'SimultaneousMusic)
 	     (reduce (lambda (x y ) (or x y)) #f (map music-separator? es)))
 	(set! m (context-spec-music (voicify-chord m) 'Staff)))
     m))
@@ -464,39 +581,51 @@ of beat groupings "
       (let* ((bn (ly:context-property tr 'currentBarNumber)))
 	(if (= bn n)
 	    #t
-	    (error
-	     (format "Bar check failed, we should have reached ~a, instead at ~a\n"
-		     n bn)))))
+	    (ly:error
+	     ;; FIXME: uncomprehensable message
+	     (_ "Bar check failed.  Expect to be at ~a, instead at ~a")
+	     n bn))))
     (set! (ly:music-property m 'procedure) checker)
     m))
 
+
+(define-public (skip->rest mus)
+
+  "Replace MUS by RestEvent of the same duration if it is a
+SkipEvent. Useful for extracting parts from crowded scores"
+
+  (if (equal? (ly:music-property mus 'name) 'SkipEvent)
+   (make-music 'RestEvent 'duration (ly:music-property mus 'duration))
+   mus))
+
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; warn for bare chords at start.
 
 (define (has-request-chord elts)
   (reduce (lambda (x y) (or x y)) #f
 	  (map (lambda (x)
-		 (equal? (ly:music-name x) "Request_chord"))
+		 (equal? (ly:music-property x 'name) 'RequestChord))
 	       elts)))
 
-(define (ly:music-message music msg)
+(define-public (ly:music-message music msg)
   (let ((ip (ly:music-property music 'origin)))
     (if (ly:input-location? ip)
 	(ly:input-message ip msg)
-	(ly:warn msg))))
+	(ly:warning msg))))
 
 (define (check-start-chords music)
   "Check music expression for a Simultaneous_music containing notes\n(ie. Request_chords),
 without context specification. Called  from parser."
   (let ((es (ly:music-property music 'elements))
 	(e (ly:music-property music 'element))
-	(name (ly:music-name music)))
+	(name (ly:music-property music 'name)))
     (cond ((equal? name "Context_specced_music") #t)
 	  ((equal? name "Simultaneous_music")
 	   (if (has-request-chord es)
-	       (ly:music-message music "Starting score with a chord.\nPlease insert an explicit \\context before chord")
+	       (ly:music-message music "Starting score with a chord.\nInsert an explicit \\context before chord")
 	       (map check-start-chords es)))
-	  ((equal? name "Sequential_music")
+	  ((equal? name "SequentialMusic")
 	   (if (pair? es)
 	       (check-start-chords (car es))))
 	  (else (if (ly:music? e) (check-start-chords e)))))
@@ -544,7 +673,7 @@ without context specification. Called  from parser."
 
 
 (defmacro-public def-grace-function (start stop)
-  `(def-music-function (parser location music) (ly:music?)
+  `(define-music-function (parser location music) (ly:music?)
      (make-music 'GraceMusic
 		 'origin location
 		 'element (make-music 'SequentialMusic
@@ -552,10 +681,10 @@ without context specification. Called  from parser."
 						      music
 						      (ly:music-deep-copy ,stop))))))
 
-(defmacro-public def-music-function (args signature . body)
+(defmacro-public define-music-function (args signature . body)
   "Helper macro for `ly:make-music-function'.
 Syntax:
-  (def-music-function (parser location arg1 arg2 ...) (arg1-type? arg2-type? ...)
+  (define-music-function (parser location arg1 arg2 ...) (arg1-type? arg2-type? ...)
     ...function body...)
 "
   `(ly:make-music-function (list ,@signature)
@@ -574,7 +703,7 @@ Syntax:
 	     (cue-voice (if (eq? 1 dir) 0 1))
 	     (main-music (ly:music-property quote-music 'element))
 	     (return-value quote-music))
-	
+
 	(if (or (eq? 1 dir) (eq? -1 dir))
 	    
 	    ;; if we have stem dirs, change both quoted and main music
@@ -586,9 +715,9 @@ Syntax:
 		    ;; for the quotes is determined in the iterator.
 		    (make-sequential-music
 		     (list
-		      (context-spec-music (make-voice-props-set cue-voice) 'Voice "cue")
+		      (context-spec-music (make-voice-props-set cue-voice) 'CueVoice "cue")
 		      quote-music
-		      (context-spec-music (make-voice-props-revert)  'Voice "cue"))))
+		      (context-spec-music (make-voice-props-revert)  'CueVoice "cue"))))
 	      (set! main-music
 		    (make-sequential-music
 		     (list
@@ -605,12 +734,15 @@ Syntax:
 	 (quoted-vector (if (string? quoted-name)
 			    (hash-ref quote-tab quoted-name #f)
 			    #f)))
+
     
     (if (string? quoted-name)
-	(if  (vector? quoted-vector)
-	     (set! (ly:music-property music 'quoted-events) quoted-vector)
-	     (ly:warn "Cannot find quoted music `~S'" quoted-name)))
-
+	(if (vector? quoted-vector)
+	    (begin
+	      (set! (ly:music-property music 'quoted-events) quoted-vector)
+	      (set! (ly:music-property music 'iterator-ctor)
+		    ly:quote-iterator::constructor))
+	    (ly:warning (_ "can't find quoted music `~S'" quoted-name))))
     music))
 
 
@@ -643,18 +775,55 @@ Syntax:
 	(ly:music-length music))
   music)
 
+(define (skip-to-last music parser)
+
+  "Replace MUSIC by
+
+<< { \\set skipTypesetting = ##t
+     LENGTHOF(\\showLastLength)
+     \\set skipTypesetting = ##t  }
+    MUSIC >>
+
+if appropriate.
+ "
+  (let*
+      ((show-last  (ly:parser-lookup parser 'showLastLength)))
+    
+    (if (ly:music? show-last)
+	(let*
+	    ((orig-length (ly:music-length music))
+	     (skip-length (ly:moment-sub orig-length (ly:music-length show-last))))
+
+	  (make-simultaneous-music
+	   (list
+	    (make-sequential-music
+	     (list
+	      (context-spec-music (make-property-set 'skipTypesetting #t) 'Score)
+	      (make-music 'SkipMusic 'duration
+			  (ly:make-duration 0 0
+					    (ly:moment-main-numerator skip-length)
+					    (ly:moment-main-denominator skip-length)))
+	      (context-spec-music (make-property-set 'skipTypesetting #f) 'Score)))
+	    music)))
+	music)))
+    
+
 (define-public toplevel-music-functions
   (list
-   ;; check-start-chords ; ; no longer needed with chord syntax. 
    (lambda (music parser) (voicify-music music))
-   (lambda (x parser) (music-map glue-mm-rest-texts x))
    (lambda (x parser) (music-map music-check-error x))
    (lambda (x parser) (music-map precompute-music-length x))
    (lambda (music parser)
 
      (music-map (quote-substitute (ly:parser-lookup parser 'musicQuotes))  music))
+   
    ;; switch-on-debugging
-   (lambda (x parser) (music-map cue-substitute x))))
+   (lambda (x parser) (music-map cue-substitute x))
+ 
+   (lambda (x parser)
+     (skip-to-last x parser)
+   )))
+
 
 ;;;;;;;;;;;;;;;;;
 ;; lyrics
@@ -676,12 +845,13 @@ Syntax:
 (define-public ((add-balloon-text object-name text off) grob orig-context cur-context)
   "Usage: see input/regression/balloon.ly "
   (let* ((meta (ly:grob-property grob 'meta))
-	 (nm (if (pair? meta) (cdr (assoc 'name meta)) "nonexistant"))
-	 (cb (ly:grob-property grob 'print-function)))
-    (if (equal? nm object-name)
+	 (cb (ly:grob-property-data grob 'stencil))
+	 (nm (if (pair? meta) (cdr (assoc 'name meta)) "nonexistant")))
+    (if (and (equal? nm object-name)
+	     (procedure? cb))
 	(begin
-	  (set! (ly:grob-property grob 'print-function) Balloon_interface::print)
-	  (set! (ly:grob-property grob 'balloon-original-callback) cb)
+	  (ly:grob-set-property! grob 'stencil  ly:balloon-interface::print)
+	  (set! (ly:grob-property grob 'original-stencil) cb)
 	  (set! (ly:grob-property grob 'balloon-text) text)
 	  (set! (ly:grob-property grob 'balloon-text-offset) off)
 	  (set! (ly:grob-property grob 'balloon-text-props) '((font-family . roman)))))))
@@ -780,7 +950,7 @@ use GrandStaff as a context. "
 				   '()
 				   context))
       (else
-       (ly:warn "Unknown accidental style: ~S" (symbol->string style))
+       (ly:warning (_ "unknown accidental style: ~S" style))
        (make-sequential-music '()))))))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -802,3 +972,14 @@ use GrandStaff as a context. "
 	   (ly:make-duration 0 0) '())))
     (ly:music-compress skip (ly:music-length mus))
     skip))
+
+(define-public (pitch-of-note event-chord)
+
+  (let*
+      ((evs (filter (lambda (x) (memq 'note-event (ly:music-property x 'types)))
+		    (ly:music-property event-chord 'elements))))
+
+    (if (pair? evs)
+	(ly:music-property (car evs) 'pitch)
+	#f)))
+