X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=scm%2Foutput-lib.scm;h=2978f3b198e567adde40f529536590cde4684235;hb=480a711ef5165e3d38839c0b6c90ec931bce94d3;hp=eba247bc61ef5673cbaf5e3494395a59d284de92;hpb=664070d837cc4855091455892cb942cdcedeef0c;p=lilypond.git

diff --git a/scm/output-lib.scm b/scm/output-lib.scm
index eba247bc61..2978f3b198 100644
--- a/scm/output-lib.scm
+++ b/scm/output-lib.scm
@@ -2,171 +2,156 @@
 ;;;;
 ;;;;  source file of the GNU LilyPond music typesetter
 ;;;; 
-;;;; (c)  1998--2004 Jan Nieuwenhuizen <janneke@gnu.org>
-;;;; Han-Wen Nienhuys <hanwen@cs.uu.nl>
+;;;; (c) 1998--2006 Jan Nieuwenhuizen <janneke@gnu.org>
+;;;; Han-Wen Nienhuys <hanwen@xs4all.nl>
 
-; Tablature functions, by Jiba (jiba@tuxfamily.org)
 
-; The TabNoteHead stem attachment function.
-(define (tablature-stem-attachment-function style duration)
-  (cons 0.0 0.5))
 
 
-; The TabNoteHead tablatureFormat callback.
-; Compute the text grob-property
-(define-public (fret-number-tablature-format string tuning pitch)
-  (number->string
-   (- (ly:pitch-semitones pitch)
-      (list-ref tuning
-                (- string 1) ; remove 1 because list index starts at 0 and guitar string at 1.
-                )
-      ))) 
-
-(define-public (hammer-print-function grob)
-  (let* ((note-collums (ly:grob-property grob 'note-columns))
-         (note-column1 (cadr note-collums))
-         (note-column2 (car  note-collums))
-         (note1        (car (ly:grob-property note-column1 'note-heads)))
-         (note2        (car (ly:grob-property note-column2 'note-heads)))
-	 (text1  (ly:grob-property note1 'text))
-	 (text2  (ly:grob-property note2 'text))
-         (fret1        (if (string? text1) (string->number text1) 0))
-         (fret2        (if (string? text2) (string->number text2) 0))
-         (letter       (cond
-			((< fret1 fret2) "H")
-			((> fret1 fret2) "P")
-			(else "")))
-                                   
-         )
-    (let* ((slur (Slur::print grob))
-	   (paper (ly:grob-paper grob))
-	   (text (interpret-markup
-		  paper
-		  (ly:grob-alist-chain grob (ly:output-def-lookup paper 'text-font-defaults))
-		  letter)))
-    
-      (let ((x (/ (- (cdr (ly:stencil-extent slur 0)) 
-                     (/ (cdr (ly:stencil-extent text 0)) 2.0)
-                     )
-                  -2.0)))
-      
-        (ly:stencil-set-extent! text 0 (cons x x))
-        (ly:stencil-align-to! text 0 1)
-        )
-
-      (ly:stencil-combine-at-edge slur 1 1 text -0.6)
-      ) ) )
-
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; general
 
+(define-public (make-stencil-boxer thickness padding callback)
 
-(define-public guitar-tunings '(4 -1 -5 -10 -15 -20))
-
-; end of tablature functions
+  "Return function that adds a box around the grob passed as argument."
+  (lambda (grob)
+    
+    (box-stencil (callback grob) thickness padding)))
+
+(define-public (make-stencil-circler thickness padding callback)
+  "Return function that adds a circle around the grob passed as argument."
+  
+  (lambda (grob) (circle-stencil (callback grob) thickness padding)))
+
+(define-public (print-circled-text-callback grob)
+  (let* ((text (ly:grob-property grob 'text))
+	 
+	 (layout (ly:grob-layout grob))
+	 (defs (ly:output-def-lookup layout 'text-font-defaults))
+	 (props (ly:grob-alist-chain grob defs))
+	 (circle (ly:text-interface::interpret-markup
+		  layout props (make-circle-markup text))))
+    circle))
+
+(define-public (music-cause grob)
+  (let*
+      ((event (event-cause grob)))
+
+    (if (ly:stream-event? event)
+	(ly:event-property event 'music-cause)
+	#f)))
+
+(define-public (event-cause grob)
+  (let*
+      ((cause (ly:grob-property  grob 'cause)))
+    
+    (cond
+     ((ly:stream-event? cause) cause)
+     ((ly:grob? cause) (event-cause cause))
+     (else #f))))
 
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; tablature
 
-(define-public (make-stencil-boxer line-thick x-padding y-padding callback)
-  "Makes a routine that adds a box around the grob parsed as argument"
-  (define (stencil-boxer grob)
-    (let*
-	(
-	 (mol    (callback grob))
-	 (x-ext (interval-widen (ly:stencil-extent mol 0) x-padding))
-	 (y-ext (interval-widen (ly:stencil-extent mol 1) y-padding))
-	 (x-rule (make-filled-box-stencil (interval-widen x-ext line-thick)
-					  (cons 0 line-thick)))
-	 (y-rule (make-filled-box-stencil (cons 0 line-thick) y-ext))
-	 )
+;; The TabNoteHead tablatureFormat callback.
+;; Compute the text grob-property
+(define-public (fret-number-tablature-format string tuning pitch)
+  (make-whiteout-markup
+   (make-vcenter-markup  
+    (number->string
+     (- (ly:pitch-semitones pitch)
+	(list-ref tuning
+		  ;; remove 1 because list index starts at 0 and guitar string at 1. 
+		  (- string 1)))))))
+
+;; The 5-string banjo has got a extra string, the fifth (duh), wich
+;; starts at the fifth fret on the neck. Frets on the fifth string
+;; are referred to relative to the other frets:
+;;   the "first fret" on the fifth string is really the sixth fret
+;;   on the banjo neck.
+;; We solve this by defining a new fret-number-tablature function:
+(define-public (fret-number-tablature-format-banjo string tuning pitch)
+  (make-whiteout-markup
+   (make-vcenter-markup  
+    (let ((fret (- (ly:pitch-semitones pitch) (list-ref tuning (- string 1)))))
+      (number->string (cond
+		       ((and (> fret 0) (= string 5))
+			(+ fret 5))
+		       (else fret)))))))
+
+
+; default tunings for common string instruments
+(define-public guitar-tuning '(4 -1 -5 -10 -15 -20))
+(define-public guitar-open-g-tuning '(2 -1 -5 -10 -17 -22))
+(define-public bass-tuning '(-17 -22 -27 -32))
+(define-public mandolin-tuning '(16 9 2 -5))
+
+;; tunings for 5-string banjo
+(define-public banjo-open-g-tuning '(2 -1 -5 -10 7))
+(define-public banjo-c-tuning '(2 -1 -5 -12 7))
+(define-public banjo-modal-tuning '(2 0 -5 -10 7))
+(define-public banjo-open-d-tuning '(2 -3 -6 -10 9))
+(define-public banjo-open-dm-tuning '(2 -3 -6 -10 9))
+;; convert 5-string banjo tuning to 4-string by removing the 5th string
+(define-public (four-string-banjo tuning)
+  (reverse (cdr (reverse tuning))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; note heads
+
+
+(define-public (stem::calc-duration-log grob)
+  (ly:duration-log
+   (ly:event-property (event-cause grob) 'duration)))
+
+(define-public (note-head::calc-duration-log grob)
+  (min 2 
+       (ly:duration-log
+	(ly:event-property (event-cause grob) 'duration))))
+
+(define-public (dots::calc-dot-count grob)
+  (ly:duration-dot-count
+   (ly:event-property (event-cause grob) 'duration)))
+
+(define (note-head::calc-tablature-stem-attachment grob)
+  (cons 0.0 1.35))
 
-      (set! mol (ly:stencil-combine-at-edge mol 0 1 y-rule x-padding))
-      (set! mol (ly:stencil-combine-at-edge mol 0 -1 y-rule x-padding))
-      (set! mol (ly:stencil-combine-at-edge mol 1 1 x-rule 0))  
-      (set! mol (ly:stencil-combine-at-edge mol 1 -1 x-rule 0))
-      
-      mol))
-  stencil-boxer)
-
-(define-public (arg->string arg)
-  (cond ((number? arg) (ly:inexact->string arg 10))
-	((string? arg) (string-append "\"" arg "\""))
-	((symbol? arg) (string-append "\"" (symbol->string arg) "\""))))
-
-(define-public (func name . args)
-  (string-append
-   "(" name
-   (if (null? args)
-       ""
-       (apply string-append
-	      (map (lambda (x) (string-append " " (arg->string x))) args)))
-   ")\n"))
-
-;;(define (mm-to-pt x)
-;;  (* (/ 72.27 25.40) x))
-
-;; do nothing in .scm output
-(define-public (comment s) "")
-
-(define-public (ly:numbers->string lst)
-  (string-join (map ly:number->string lst) " "))
-
-(define (number->octal-string x)
-  (let* ((n (inexact->exact x))
-         (n64 (quotient n 64))
-         (n8 (quotient (- n (* n64 64)) 8)))
-    (string-append
-     (number->string n64)
-     (number->string n8)
-     (number->string (remainder (- n (+ (* n64 64) (* n8 8))) 8)))))
-
-(define-public (ly:inexact->string x radix)
-  (let ((n (inexact->exact x)))
-    (number->string n radix)))
-
-(define-public (ly:number-pair->string c)
-  (string-append (ly:number->string (car c)) " "
-		 (ly:number->string (cdr c))))
-
-(define (font i)
-  (string-append
-   "font"
-   (make-string 1 (integer->char (+ (char->integer #\A) i)))))
-
-(define (scm-scm action-name)
-  1)
 
 
 ;; silly, use alist? 
-(define-public (find-notehead-symbol duration style)
-  (case style
-   ((xcircle) "2xcircle")
-   ((harmonic) "0harmonic")
-   ((baroque) 
-    ;; Oops, I actually would not call this "baroque", but, for
-    ;; backwards compatibility to 1.4, this is supposed to take
-    ;; brevis, longa and maxima from the neo-mensural font and all
-    ;; other note heads from the default font.  -- jr
-    (if (< duration 0)
-	(string-append (number->string duration) "neo_mensural")
-	(number->string duration)))
-   ((mensural)
-    (string-append (number->string duration) (symbol->string style)))
-   ((neo_mensural)
-    (string-append (number->string duration) (symbol->string style)))
-   ((default)
-    ;; The default font in mf/feta-bolletjes.mf defines a brevis, but
-    ;; neither a longa nor a maxima.  Hence let us, for the moment,
-    ;; take these from the neo-mensural font.  TODO: mf/feta-bolletjes
-    ;; should define at least a longa for the default font.  The longa
-    ;; should look exactly like the brevis of the default font, but
-    ;; with a stem exactly like that of the quarter note. -- jr
-    (if (< duration -1)
-	(string-append (number->string duration) "neo_mensural")
-	(number->string duration)))
-   (else
-    (if (string-match "vaticana*|hufnagel*|medicaea*" (symbol->string style))
-	(symbol->string style)
-	(string-append (number->string (max 0 duration))
-		       (symbol->string style))))))
-
+(define-public (note-head::calc-glyph-name grob)
+  (let*
+      ((style (ly:grob-property grob 'style))
+       (log (min 2 (ly:grob-property grob 'duration-log))))
+    
+    (case style
+      ;; "default" style is directly handled in note-head.cc as a
+      ;; special case (HW says, mainly for performance reasons).
+      ;; Therefore, style "default" does not appear in this case
+      ;; statement.  -- jr
+      ((xcircle) "2xcircle")
+      ((harmonic) "0harmonic")
+      ((baroque) 
+       ;; Oops, I actually would not call this "baroque", but, for
+       ;; backwards compatibility to 1.4, this is supposed to take
+       ;; brevis, longa and maxima from the neo-mensural font and all
+       ;; other note heads from the default font.  -- jr
+       (if (< log 0)
+	   (string-append (number->string log) "neomensural")
+	   (number->string log)))
+      ((mensural)
+       (string-append (number->string log) (symbol->string style)))
+      ((petrucci)
+       (if (< log 0)
+	   (string-append (number->string log) "mensural")
+	   (string-append (number->string log) (symbol->string style))))
+      ((neomensural)
+       (string-append (number->string log) (symbol->string style)))
+      (else
+       (if (string-match "vaticana*|hufnagel*|medicaea*" (symbol->string style))
+	   (symbol->string style)
+	   (string-append (number->string (max 0 log))
+			  (symbol->string style)))))))
 
 ;; TODO junk completely?
 (define (note-head-style->attachment-coordinates grob axis)
@@ -174,17 +159,11 @@
 bounding box, where to attach the stem. e.g.: X==0 means horizontally
 centered, X==1 is at the right, X == -1 is at the left."
 
-   '(1.0 . 0.0))
+  '(1.0 . 0.0))
 
 
-(define-public (string-encode-integer i)
-  (cond
-   ((= i  0) "o")
-   ((< i 0)   (string-append "n" (string-encode-integer (- i))))
-   (else (string-append
-	  (make-string 1 (integer->char (+ 65 (modulo i 26))))
-	  (string-encode-integer (quotient i 26))))))
-
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; bar numbers
 
 (define-public ((every-nth-bar-number-visible n) barnum) (= 0 (modulo barnum n)))
 
@@ -192,60 +171,338 @@ centered, X==1 is at the right, X == -1 is at the left."
 
 (define-public ((set-bar-number-visibility n) tr)
   (let* ((bn (ly:context-property tr 'currentBarNumber)))
-   (ly:context-set-property! tr 'barNumberVisibility (modulo-bar-number-visible n (modulo bn n)))))
-
-(define-public (default-bar-number-visibility barnum) (> barnum 1))
-
-;; See documentation of Item::visibility_lambda_
-(define-public (begin-of-line-visible d) (if (= d 1) '(#f . #f) '(#t . #t)))
-(define-public (end-of-line-visible d) (if (= d -1) '(#f . #f) '(#t . #t)))
-(define-public (spanbar-begin-of-line-invisible d) (if (= d -1) '(#t . #t) '(#f . #f)))
-
-(define-public (all-visible d) '(#f . #f))
-(define-public (all-invisible d) '(#t . #t))
-(define-public (begin-of-line-invisible d) (if (= d 1) '(#t . #t) '(#f . #f)))
-(define-public (end-of-line-invisible d) (if (= d -1) '(#t . #t) '(#f . #f)))
-
+    (ly:context-set-property! tr 'barNumberVisibility (modulo-bar-number-visible n (modulo bn n)))))
+
+(define-public (first-bar-number-invisible barnum) (> barnum 1))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; break visibility
+
+(define-public begin-of-line-visible
+  #(#f #f #t))
+(define-public end-of-line-visible
+  #(#t #f #f))
+(define-public end-of-line-invisible
+  #(#f #t #t))
+(define-public spanbar-begin-of-line-invisible
+  #(#t #f #f))
+(define-public all-visible #(#t #t #t))
+(define-public all-invisible #(#f #f #f))
+(define-public begin-of-line-invisible
+  #(#t #t #f))
+(define-public center-invisible #(#t #f #t))
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; Bar lines.
 
-;
-; How should a  bar line behave at a break? 
-;
+;;
+;; How should a  bar line behave at a break? 
+;;
 ;; Why prepend `default-' to every scm identifier?
-(define-public (default-break-barline glyph dir)
-   (let ((result (assoc glyph 
-			'((":|:" . (":|" . "|:"))
-			  ("||:" . ("||" . "|:"))
-			  ("|" . ("|" . ()))
-			  ("||:" . ("||" . "|:"))
-			  ("|s" . (() . "|"))
-			  ("|:" . ("|" . "|:"))
-			  ("|." . ("|." . ()))
-
-			  ;; hmm... should we end with a bar line here?
-			  (".|" . ("|" . ".|"))
-			  (":|" . (":|" . ()))
-			  ("||" . ("||" . ()))
-			  (".|." . (".|." . ()))
-			  ("" . ("" . ""))
-			  (":" . (":" . ""))
-			  ("empty" . (() . ()))
-			  ("brace" . (() . "brace"))
-			  ("bracket" . (() . "bracket"))  
-			  )
-			)))
-
-     (if (equal? result #f)
-	 (ly:warn (string-append "Unknown bar glyph: `" glyph "'"))
-	 (index-cell (cdr result) dir))
-     ) )
-     
+(define-public (bar-line::calc-glyph-name grob)
+  (let* (
+	 (glyph (ly:grob-property grob 'glyph))
+	 (dir (ly:item-break-dir grob))
+	 (result (assoc glyph 
+		       '((":|:" . (":|" . "|:"))
+			 ("||:" . ("||" . "|:"))
+			 ("dashed" . ("dashed" . '())) 
+			 ("|" . ("|" . ()))
+			 ("||:" . ("||" . "|:"))
+			 ("|s" . (() . "|"))
+			 ("|:" . ("|" . "|:"))
+			 ("|." . ("|." . ()))
+
+			 ;; hmm... should we end with a bar line here?
+			 (".|" . ("|" . ".|"))
+			 (":|" . (":|" . ()))
+			 ("||" . ("||" . ()))
+			 (".|." . (".|." . ()))
+			 ("" . ("" . ""))
+			 (":" . (":" . ""))
+			 ("." . ("." . ()))
+			 ("empty" . (() . ()))
+			 ("brace" . (() . "brace"))
+			 ("bracket" . (() . "bracket"))  )))
+	 (glyph-name (if (= dir CENTER)
+			 glyph
+		         (if (and result (string? (index-cell (cdr result) dir)))
+			     (index-cell (cdr result) dir)
+			     #f)))
+	 )
+
+    (if (not glyph-name)
+	(ly:grob-suicide! grob))
+
+    glyph-name))
 
 
 (define-public (shift-right-at-line-begin g)
   "Shift an item to the right, but only at the start of the line."
-  (if (and (ly:item? g)  (equal? (ly:item-break-dir g) RIGHT))
-      (ly:grob-translate-axis! g 3.5 X)
+  (if (and (ly:item? g)
+	   (equal? (ly:item-break-dir g) RIGHT))
+      (ly:grob-translate-axis! g 3.5 X)))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tuplets
+
+(define-public (tuplet-number::calc-denominator-text grob)
+  (number->string (ly:event-property (event-cause grob) 'denominator)))
+
+(define-public (tuplet-number::calc-fraction-text grob)
+  (let*
+      ((ev (event-cause grob)))
+
+    (format "~a:~a" 
+	    (ly:event-property ev 'denominator)
+	    (ly:event-property ev 'numerator))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Color
+
+(define-public color? list?)
+
+; predefined colors
+(define-public black       '(0.0 0.0 0.0))
+(define-public white       '(1.0 1.0 1.0))
+(define-public red         '(1.0 0.0 0.0))
+(define-public green       '(0.0 1.0 0.0))
+(define-public blue        '(0.0 0.0 1.0))
+(define-public cyan        '(0.0 1.0 1.0))
+(define-public magenta     '(1.0 0.0 1.0))
+(define-public yellow      '(1.0 1.0 0.0))
+
+(define-public grey        '(0.5 0.5 0.5))
+(define-public darkred     '(0.5 0.0 0.0))
+(define-public darkgreen   '(0.0 0.5 0.0))
+(define-public darkblue    '(0.0 0.0 0.5))
+(define-public darkcyan    '(0.0 0.5 0.5))
+(define-public darkmagenta '(0.5 0.0 0.5))
+(define-public darkyellow  '(0.5 0.5 0.0))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; * Pitch Trill Heads
+;; * Parentheses
+
+(define (parenthesize-elements grob . rest)
+  (let*
+      ((refp (if (null? rest)
+		 grob
+		 (car rest)))
+       (elts (ly:grob-object grob 'elements))
+       (x-ext (ly:relative-group-extent elts refp X))
+
+       (font (ly:grob-default-font grob))
+       (lp (ly:font-get-glyph font "accidentals.leftparen"))
+       (rp (ly:font-get-glyph font "accidentals.rightparen"))
+       (padding (ly:grob-property grob 'padding 0.1)))
+    
+    (ly:stencil-add
+     (ly:stencil-translate-axis lp (- (car x-ext) padding) X)
+     (ly:stencil-translate-axis rp (+ (cdr x-ext) padding) X))
+  ))
+
+
+(define (parentheses-item::print me)
+  (let*
+      ((elts (ly:grob-object me 'elements))
+       (y-ref (ly:grob-common-refpoint-of-array me elts Y))
+       (x-ref (ly:grob-common-refpoint-of-array me elts X))
+       (stencil (parenthesize-elements me x-ref))
+       (elt-y-ext  (ly:relative-group-extent elts y-ref Y))
+       (y-center (interval-center elt-y-ext)))
+
+    (ly:stencil-translate
+     stencil
+     (cons
+      (-
+       (ly:grob-relative-coordinate me x-ref X))
+      (-
+       y-center
+       (ly:grob-relative-coordinate me y-ref Y))))
+    ))
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; 
+
+(define-public (chain-grob-member-functions grob value . funcs)
+  (for-each
+   (lambda (func)
+     (set! value (func grob value)))
+   funcs)
+
+  value)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; falls
+
+(define-public (fall::print spanner)
+  (let*
+      ((delta-y (* 0.5 (ly:grob-property spanner 'delta-position)))
+       (left-span (ly:spanner-bound spanner LEFT))
+       (right-span (ly:spanner-bound spanner RIGHT))
+       (thickness (* (ly:grob-property spanner 'thickness)
+		     (ly:output-def-lookup (ly:grob-layout spanner)
+					   'line-thickness)))
+       (padding (ly:grob-property spanner 'padding 0.5))
+       (common (ly:grob-common-refpoint right-span
+					(ly:grob-common-refpoint spanner
+								 left-span X)
+					X))
+       (left-x (+ padding
+		  (interval-end  (ly:grob-robust-relative-extent
+				  left-span common X))))
+       (right-x (- (interval-start
+		    (ly:grob-robust-relative-extent right-span common X))
+		   padding))
+       (self-x (ly:grob-relative-coordinate spanner common X))
+       (dx (- right-x left-x))
+       (exp (list 'path thickness 
+		  `(quote
+		    (rmoveto
+		     ,(- left-x self-x) 0
+
+		     rcurveto		     
+		     ,(/ dx 3)
+		     0
+		     ,dx ,(* 0.66 delta-y)
+		     ,dx ,delta-y
+		     ))))
+       )
+
+    (ly:make-stencil
+     exp
+     (cons 0 dx)
+     (cons (min 0 delta-y)
+	   (max 0 delta-y)))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; grace spacing
+
+
+(define-public (grace-spacing::calc-shortest-duration grob)
+  (let*
+     ((cols (ly:grob-object grob 'columns))
+      (get-difference
+       (lambda (idx)
+	 (ly:moment-sub (ly:grob-property
+			 (ly:grob-array-ref cols (1+ idx)) 'when)
+			(ly:grob-property
+			 (ly:grob-array-ref cols idx) 'when))))
+      
+      (moment-min (lambda (x y)
+		    (cond
+		     ((and x y)
+		      (if (ly:moment<? x y)
+			    x
+			    y))
+		     (x x)
+		     (y y)))))
+		     
+    (fold moment-min #f (map get-difference
+			     (iota (1- (ly:grob-array-length cols)))))))
+
+
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; fingering
+
+(define-public (fingering::calc-text grob)
+  (let*
+      ((event (event-cause grob))
+       (digit (ly:event-property event 'digit)))
+    
+    (if (> digit 5)
+	(ly:input-message (ly:event-property event 'origin)
+			  "Music for the martians"))
+
+    (number->string digit 10)
   ))
+
+(define-public (string-number::calc-text grob)
+  (let*
+      ((digit (ly:event-property (event-cause  grob) 'string-number)))
+    
+    (number->string digit 10)
+  ))
+
+
+(define-public (stroke-finger::calc-text grob)
+  (let*
+      ((digit (ly:event-property (event-cause grob) 'digit))
+       (text (ly:event-property (event-cause grob) 'text)))
+
+    (if (string? text)
+	text
+	(vector-ref (ly:grob-property grob 'digit-names)  (1- (max (min 5 digit) 1))))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; dynamics
+(define-public (hairpin::calc-grow-direction grob)
+  (if (eq? (ly:event-property (event-cause grob) 'class) 'decrescendo-event)
+      START
+      STOP
+      ))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; lyrics
+
+(define-public (lyric-text::print grob)
+  "Allow interpretation of tildes as lyric tieing marks."
+  
+  (let*
+      ((text (ly:grob-property grob 'text))
+       (layout (ly:grob-layout grob))
+       (defs (ly:output-def-lookup layout 'text-font-defaults))
+       (props (ly:grob-alist-chain grob defs)))
+
+    (ly:text-interface::interpret-markup layout
+					 props
+					 (if (string? text)
+					     (make-tied-lyric-markup text)
+					     text))))
+
+(define-public ((grob::calc-property-by-copy prop) grob)
+  (ly:event-property (event-cause grob) prop))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; fret boards
+
+(define (string-frets->description string-frets string-count)
+  (let*
+      ((desc (list->vector
+	      (map (lambda (x) (list 'mute  (1+ x)))
+		   (iota string-count)))))
+       
+       (for-each (lambda (sf)
+		   (let*
+		       ((string (car sf))
+			(fret (cadr sf))
+			(finger (caddr sf)))
+
+		     
+		     (vector-set! desc (1- string)
+				  (if (= 0 fret)
+				      (list 'open string)
+				      (if finger
+					  (list 'place-fret string fret finger) 
+					  (list 'place-fret string fret))
+					  
+
+				      ))
+		     ))
+		 string-frets)
+
+       (vector->list desc)))
+
+(define-public (fret-board::calc-stencil grob)
+  (let* ((string-frets (ly:grob-property grob 'string-fret-finger-combinations))
+	 (string-count (ly:grob-property grob 'string-count))
+	 (layout (ly:grob-layout grob))
+	 (defs (ly:output-def-lookup layout 'text-font-defaults))
+	 (props (ly:grob-alist-chain grob defs)))
+
+    (make-fret-diagram layout props
+		       (string-frets->description string-frets 6))))