X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=scm%2Ffret-diagrams.scm;h=fb986f91b990f3589d48d05f883017aa2a559220;hb=f49e954f4a1c1c388ebe8c0581a20da0238aed25;hp=7365aea3f5d1b0ab3aeedb6e0ca613e96b9297db;hpb=e2f5ba92300dc3fb7517165ac224e1500ad850dd;p=lilypond.git

diff --git a/scm/fret-diagrams.scm b/scm/fret-diagrams.scm
index 7365aea3f5..fb986f91b9 100644
--- a/scm/fret-diagrams.scm
+++ b/scm/fret-diagrams.scm
@@ -1,283 +1,943 @@
-(define nil '())
-(define (fret-parse-string definition-string)
- "parse a fret diagram string and return an alist with the appropriate values"
-   (let* ((fret-count 4)
-          (string-count 6)
-          (thickness 0.05)
-          (finger-code 0)
-          (dot-size 0.25)
-          (position 0.6)
-          (fret-range (list 1 fret-count))
-          (barre-list '())
-          (dot-list '())
-          (xo-list '())
-          (output-list '())
-          (items (string-split definition-string #\;)))
-      (let parse-item ((myitems items))
-          (if (not (null?  (cdr myitems))) 
-              (let ((test-string (car myitems)))
-                 (case (car (string->list (substring test-string 0 1))) 
-                    ((#\f) (set! finger-code (get-numeric-from-key test-string)))
-                    ((#\t) (set! thickness (get-numeric-from-key test-string)))
-                    ((#\c) (set! barre-list (cons* (numerify (string-split (substring test-string 2) #\-))
-                                            barre-list)))
-                    ((#\h) (set! fret-count (get-numeric-from-key test-string)))
-                    ((#\w) (set! string-count (get-numeric-from-key test-string)))
-                    ((#\d) (set! dot-size (get-numeric-from-key test-string)))
-                    ((#\p) (set! position (get-numeric-from-key test-string)))
-                    (else 
-                       (let ((this-list (string-split test-string #\-)))
-                           ;(display this-list)
-                           (if (string->number (cadr this-list))
-                              (set! dot-list (cons* (numerify this-list) dot-list))
-                              (set! xo-list (cons* (numerify this-list) xo-list))))))
-                 (parse-item (cdr myitems)))))
-               ; calculate fret-range
-               (let ((maxfret 0) (minfret 99))
-                    (let updatemax ((fret-list dot-list))
-                        (if (null?  fret-list)
-                           '()
-                           (let ((fretval (cadar fret-list)))
-                               (if (> fretval maxfret) (set! maxfret fretval))
-                               (if (< fretval minfret) (set! minfret fretval))
-                               (updatemax (cdr fret-list)))))
-                    (if (> maxfret fret-count)
-                        (set! fret-range (list minfret
-                             (let ((upfret (- (+ minfret fret-count) 1)))
-                                  (if (> maxfret upfret) maxfret upfret)))))
-                    ; subtract fret from dots
-                    (set! dot-list (subtract-base-fret (- (car fret-range) 1) dot-list)))      
-               (acons "string-count" string-count
-               (acons "dot-size" dot-size
-               (acons "position" position
-               (acons "finger-code" finger-code
-               (acons "fret-range" fret-range
-               (acons "thickness" thickness
-               (acons "barre-list" barre-list
-               (acons "dot-list" dot-list
-               (acons "xo-list" xo-list '())))))))))))
-   
+;;;; fret-diagrams.scm --
+;;;;
+;;;;  source file of the GNU LilyPond music typesetter
+;;;;
+;;;; (c) 2004--2008 Carl D. Sorensen <c_sorensen@byu.edu>
+
+(define (fret-parse-marking-list marking-list fret-count)
+  (let* ((fret-range (list 1 fret-count))
+         (barre-list '())
+         (dot-list '())
+         (xo-list '())
+         (output-alist '()))
+    (let parse-item ((mylist marking-list))
+      (if (not (null? mylist))
+          (let* ((my-item (car mylist)) (my-code (car my-item)))
+            (cond
+             ((or (eq? my-code 'open)(eq? my-code 'mute))
+              (set! xo-list (cons* my-item xo-list)))
+             ((eq? my-code 'barre)
+              (set! barre-list (cons* (cdr my-item) barre-list)))
+             ((eq? my-code 'place-fret)
+              (set! dot-list (cons* (cdr my-item) dot-list))))
+            (parse-item (cdr mylist)))))
+    ;; calculate fret-range
+    (let ((maxfret 0) (minfret 99))
+      (let updatemax ((fret-list dot-list))
+        (if (null? fret-list)
+            '()
+            (let ((fretval (second (car fret-list))))
+              (if (> fretval maxfret) (set! maxfret fretval))
+              (if (< fretval minfret) (set! minfret fretval))
+              (updatemax (cdr fret-list)))))
+      (if (> maxfret fret-count)
+          (set! fret-range
+                (list minfret
+                      (let ((upfret (- (+ minfret fret-count) 1)))
+                        (if (> maxfret upfret) maxfret upfret)))))
+      ; subtract fret from dots
+      (set! dot-list (subtract-base-fret (- (car fret-range) 1) dot-list)))
+    (acons 'fret-range fret-range
+           (acons 'barre-list barre-list
+                  (acons 'dot-list dot-list
+                         (acons 'xo-list xo-list '()))))))
+
 (define (subtract-base-fret base-fret dot-list)
-  
+  "Subtract @var{base-fret} from every fret in @var{dot-list}"
   (if (null? dot-list)
       '()
       (let ((this-list (car dot-list)))
-      (cons* (list (car this-list) (- (cadr this-list) base-fret) (if (null? (cddr this-list))
-                                                                    nil
-                                                                    (caddr this-list)))
-             (subtract-base-fret base-fret (cdr dot-list))))))
+        (cons* (list (car this-list) (- (second this-list) base-fret)
+                     (if (null? (cddr this-list))
+                         '()
+                         (third this-list)))
+               (subtract-base-fret base-fret (cdr dot-list))))))
+
+(define (sans-serif-stencil layout props mag text)
+  "Create a stencil in sans-serif font based on @var{layout} and @var{props}
+with magnification @var{mag} of the string @var{text}."
+  (let* ((my-props
+          (prepend-alist-chain
+           'font-size (stepmag mag)
+           (prepend-alist-chain 'font-family 'sans props))))
+    (interpret-markup layout my-props text)))
 
-(define (draw-strings string-count fret-range th size)
+(define (draw-strings string-count fret-range th size orientation)
+  "Draw the string lines for a fret diagram with
+@var{string-count} strings and frets as indicated in @var{fret-range}.
+Line thickness is given by @var{th}, fret & string spacing by
+@var{size}.  Orientation is determined by @var{orientation}. "
   (let* ((fret-count (+ (- (cadr fret-range) (car fret-range)) 1))
          (sl (* (+ fret-count 1) size))
-         (half-thickness (* th 0.5))
-         (string-stencil (ly:make-stencil (list 'draw-line th 0 0 0 sl)
-                         (cons (- half-thickness) half-thickness)
-                         (cons (- half-thickness) (+ sl half-thickness)))))
+         (sth (* size th))
+         (half-thickness (* sth 0.5))
+         (gap (- size sth))
+         (string-stencil
+          (if (eq? orientation 'normal)
+              (ly:make-stencil
+               (list 'draw-line sth 0 0 0 sl)
+               (cons (- half-thickness) half-thickness)
+               (cons (- half-thickness) (+ sl half-thickness)))
+              (ly:make-stencil
+               (list 'draw-line sth 0 0 sl 0)
+               (cons (- half-thickness) (+ sl half-thickness))
+               (cons (- half-thickness) half-thickness)))))
     (if (= string-count 1)
-         string-stencil
-        (ly:stencil-combine-at-edge
-         (draw-strings (- string-count 1) fret-range th size) 0 1
-         string-stencil
-         (- size th) 0))))
-
-(define (draw-fret-lines fret-count string-count th size)
-    (let* ((fret-length (* (- string-count 1) size))
-          (half-thickness (* th 0.5))
-          (fret-line (ly:make-stencil (list 'draw-line th 0 size fret-length size)
-                          (cons 0 fret-length)
-                          (cons (- size half-thickness) (+  size half-thickness)))))
-       (if (= fret-count 1)
-         fret-line
-         (ly:stencil-combine-at-edge fret-line Y UP
-          (draw-fret-lines (- fret-count 1) string-count th size)
-          (- size th) 0))))
- 
-(define (draw-frets paper fret-range string-count th size)
+        string-stencil
+        (if (eq? orientation 'normal)
+            (ly:stencil-combine-at-edge
+             (draw-strings (- string-count 1) fret-range th size orientation)
+             X RIGHT
+             string-stencil
+             gap)
+            (ly:stencil-combine-at-edge
+             (draw-strings (- string-count 1) fret-range th size orientation)
+             Y UP
+             string-stencil
+             gap)))))
+
+(define (draw-fret-lines fret-count string-count th size orientation)
+  "Draw @var{fret-count} fret lines for a fret diagram
+with @var{string-count} strings.  Line thickness is given by @var{th},
+fret & string spacing by @var{size}. Orientation is given by @var{orientation}"
+  (let* ((sth (* size th))
+         (gap (- size sth))
+         (fret-line (draw-fret-line string-count th size orientation)))
+    (if (= fret-count 1)
+        fret-line
+        (if (eq? orientation 'normal)
+            (ly:stencil-combine-at-edge
+             (draw-fret-lines
+              (- fret-count 1) string-count th size orientation)
+             Y UP
+             fret-line
+             gap 0)
+            (ly:stencil-combine-at-edge
+             (draw-fret-lines
+              (- fret-count 1) string-count th size orientation)
+             X RIGHT
+             fret-line
+             gap 0)))))
+
+(define (draw-fret-line string-count th size orientation)
+  "Draw a fret line for a fret diagram."
+  (let* ((fret-length (* (- string-count 1) size))
+         (sth (* size th))
+         (half-thickness (* sth 0.5)))
+    (if (eq? orientation 'normal)
+        (ly:make-stencil
+         (list 'draw-line sth half-thickness size
+               (- fret-length half-thickness) size)
+         (cons 0 fret-length)
+         (cons (- half-thickness) half-thickness))
+        (ly:make-stencil
+         (list 'draw-line sth 0 half-thickness
+               0 (- fret-length half-thickness))
+         (cons (- half-thickness) half-thickness)
+         (cons 0 fret-length)))))
+
+(define (draw-thick-zero-fret details string-count th size orientation)
+  "Draw a thick zeroth fret for a fret diagram whose base fret is not 1."
+  (let* ((sth (* th size))
+         (top-fret-thick
+          (* sth (assoc-get 'top-fret-thickness details 3.0)))
+         (half-thick (* sth 0.5))
+         (x1 half-thick)
+         (x2 (+ half-thick (* size (- string-count 1))))
+         (y1 (- half-thick))
+         (y2 (+ top-fret-thick half-thick))
+         (x-extent (cons (- x1) x2))
+         (y-extent (cons sth top-fret-thick)))
+    (if (eq? orientation 'normal)
+        (ly:make-stencil (list 'round-filled-box x1 x2 y1 y2 sth)
+                         x-extent y-extent)
+        (ly:make-stencil (list 'round-filled-box y1 y2 x1 x2 sth)
+                         y-extent x-extent))))
+
+(define (draw-frets fret-range string-count th size orientation)
+  "Draw the fret lines for a fret diagram with
+@var{string-count} strings and frets as indicated in @var{fret-range}.
+Line thickness is given by @var{th}, fret & string spacing by
+@var{size}. Orientation is given by @var{orientation}."
   (let* ((fret-count (+ (- (cadr fret-range) (car fret-range)) 1))
          (fret-length (* (- string-count 1) size))
          (half-thickness (* th 0.5))
-         (base-fret (car fret-range)))
-       (ly:stencil-combine-at-edge
-          (draw-fret-lines fret-count string-count th size) Y UP
-             (if (= base-fret 1)
-                 (draw-fret-lines 1 string-count (* th 2) size)
-                 (draw-fret-lines 1 string-count th size)) 
-                 (- size th) 0))) 
-
-(define (draw-dots paper string-count fret-range size dot-size position finger-code dot-list)
+         (base-fret (car fret-range))
+         (fret-zero (draw-fret-line string-count th size orientation)))
+    (if (eq? orientation 'normal)
+        (ly:stencil-combine-at-edge
+         (draw-fret-lines fret-count string-count th size orientation)
+         Y UP
+         fret-zero
+         (- size th))
+        (ly:stencil-combine-at-edge
+         fret-zero X RIGHT
+         (draw-fret-lines fret-count string-count th size orientation)
+         (- size th)))))
+
+(define (draw-dots layout props string-count fret-count
+                   fret-range size finger-code
+                   dot-position dot-radius dot-thickness dot-list orientation)
   "Make dots for fret diagram."
-  (let* ((dot-radius (* size dot-size))
-         (fret-count (+ (- (cadr fret-range) (car fret-range) 1)))
+
+  (let* ((details (chain-assoc-get 'fret-diagram-details props '()))
+         (scale-dot-radius (* size dot-radius))
+         (scale-dot-thick (* size dot-thickness))
+         (dot-color (assoc-get 'dot-color details 'black))
+         (finger-xoffset -0.25)
+         (finger-yoffset (* -0.5 size ))
+         (dot-label-font-mag
+          (* scale-dot-radius (assoc-get 'dot-label-font-mag details 1.0)))
+         (string-label-font-mag
+          (* size (assoc-get 'string-label-font-mag details 0.6)))
          (mypair (car dot-list))
          (restlist (cdr dot-list))
-         (xpos (* (- string-count (car mypair)) size))
-         (ypos (* (+ 4 (- fret-count (cadr mypair) position )) size))
+         (string (car mypair))
+         (fret (cadr mypair))
+         (xpos (* size (if (eq? orientation 'normal)
+                           (- string-count string)
+                           (+ (- fret 1 ) dot-position))))
+         (ypos (* size (if (eq? orientation 'normal)
+                           (+ 2 (- fret-count fret dot-position ))
+                           (- string-count string))))
+         (extent (cons (- scale-dot-radius) scale-dot-radius))
          (finger (caddr mypair))
-         (font (ly:paper-get-font paper `(((font-magnification . ,(* 0.8 size))(font-name . "cmss8")
-                                        (font-encoding Tex-text)))))
-         (font2 (ly:paper-get-font paper `(((font-magnification . ,(* (* 2 dot-size) size))(font-name . "cmss8")
-                                        (font-encoding Tex-text)))))
-         (font3 (ly:paper-get-font paper `(((font-magnification . ,(* (* 3 dot-size) size))(font-name . "cmss8")
-                                        (font-encoding Tex-text)))))
-         (extent (cons (- (*  size 0.25)) (*  size 0.25)))
-         (dotstencil (if (or (eq? finger nil)(eq? finger-code 0))
-                          (ly:make-stencil (list 'dot xpos ypos dot-radius ) extent extent)
-                          (if (eq? finger-code 1)
-  ; TODO -- Get nice circled numbers in the font, instead of this kludge
-                             (ly:stencil-add 
-                               (ly:stencil-translate-axis 
-                                   (ly:stencil-translate-axis 
-                                       (fontify-text font2 (number->string finger)) (- xpos (* size 0.3)) X)
-                                   (- ypos (* 1 dot-size size)) Y)
-                               (ly:stencil-translate-axis 
-                                   (ly:stencil-translate-axis 
-                                       (fontify-text font3 "O") (- xpos (* 2.2 dot-size size)) X)
-                                   (- ypos (* 1.7 dot-size size)) Y))
-                          (if (eq? finger-code 2) 
-                              (ly:stencil-add 
-                                   (ly:make-stencil (list 'dot xpos ypos dot-radius ) extent extent)
-                                   (ly:stencil-translate-axis 
-                                        (ly:stencil-translate-axis 
-                                              (fontify-text font (number->string finger)) (- xpos (* size 0.3)) X)
-                                        (- size) Y)))))))
+         (finger (if (number? finger) (number->string finger) finger))
+         (dotstencil (if (eq? dot-color 'white)
+                         (ly:stencil-add
+                          (make-circle-stencil
+                           scale-dot-radius scale-dot-thick #t)
+                          (ly:stencil-in-color
+                           (make-circle-stencil
+                            (- scale-dot-radius (* 0.5 scale-dot-thick))
+                            0  #t)
+                           1 1 1))
+                         (make-circle-stencil
+                          scale-dot-radius scale-dot-thick #t)))
+         (positioned-dot (begin
+                           (ly:stencil-translate-axis
+                            (ly:stencil-translate-axis dotstencil xpos X)
+                            ypos Y)))
+         (labeled-dot-stencil
+          (if (or (eq? finger '())(eq? finger-code 'none))
+              positioned-dot
+              (if (eq? finger-code 'in-dot)
+                  (let* ((finger-label
+                          (centered-stencil
+                           (sans-serif-stencil
+                            layout props dot-label-font-mag finger))))
+                    (ly:stencil-translate-axis
+                     (ly:stencil-translate-axis
+                      (ly:stencil-add
+                       dotstencil
+                       (if (eq? dot-color 'white)
+                           finger-label
+                           (ly:stencil-in-color finger-label 1 1 1)))
+                      xpos X)
+                     ypos Y))
+                  (if (eq? finger-code 'below-string)
+                      (ly:stencil-add
+                       positioned-dot
+                       (if (eq? orientation 'normal)
+                           (ly:stencil-translate-axis
+                            (ly:stencil-translate-axis
+                             (centered-stencil
+                              (sans-serif-stencil
+                               layout props string-label-font-mag finger))
+                             xpos X)
+                            (* size finger-yoffset) Y)
+                           (ly:stencil-translate-axis
+                            (ly:stencil-translate-axis
+                             (centered-stencil
+                              (sans-serif-stencil
+                               layout props string-label-font-mag finger))
+                             (* size (+ 2 fret-count finger-yoffset)) X)
+                            ypos Y)))
+                      ;unknown finger-code
+                      positioned-dot)))))
     (if (null? restlist)
-        dotstencil
-        (ly:stencil-add (draw-dots paper string-count fret-range size dot-size position finger-code restlist)
-                         dotstencil))))
-
-(define (draw-xo paper string-count fret-range size xo-list) 
-"Put x and o on chord diagram."
-    (let* ((dot-radius (* size 0.25))
-           (fret-count (+ (- (cadr fret-range) (car fret-range) 1)))
-           (font (ly:paper-get-font paper `(((font-size . ,(* -5 (+ 1 (* 2.6 (- 1 size)))))(font-family . music)))))
-           (mypair (car xo-list))
-           (restlist (cdr xo-list))
-;TODO -- get better glyphs in font to use for x (mute string) and o (open string)
-;        Perhaps explore just using sans-serif font?
-           (glyph-name (if (char=? (cadr mypair) #\x) "noteheads-2cross"
-                         "scripts-open"))
-           (tmpdot (if (char=? (cadr mypair) #\x) 0 (* size 0.25)))
-           (xpos (if (char=? (cadr mypair) #\x)
-                (- (* (- string-count (car mypair)) size) (* .35 size) )
-                (* (- string-count (car mypair)) size)))
-          (ypos (* (+ 3.5 fret-count) size))
-          (extent (cons (- (* size 0.25)) (* size 0.25)))
-          (glyph-stencil (ly:stencil-translate-axis 
-                (ly:stencil-translate-axis (ly:find-glyph-by-name font glyph-name) ypos Y)
-                xpos X)))
-      (if (null? restlist)
-          glyph-stencil
-          (ly:stencil-add
-            (draw-xo paper string-count fret-range size restlist)
-            glyph-stencil))))
-
-(define (make-bezier-sandwich-list left right bottom height thickness)
-   (let* ((width (+ (- right left) 1))
-          (x1 (+ (* width 0.1) left))
-          (x2 (- right (* width 0.1)))
-          (bottom-control-point-height (+ bottom (- height thickness)))
-          (top-control-point-height (+ bottom height)))
-; order of points is: left cp low, right cp low, right end low, left end low
-;                     right cp high, left cp high, left end high, right end high.
-       (list (cons x1 bottom-control-point-height) (cons x2 bottom-control-point-height) (cons right bottom) (cons left bottom)
-             (cons x2 top-control-point-height) (cons x1 top-control-point-height) (cons left bottom) (cons right bottom))))
-
-(define (draw-barre paper string-count fret-range size barre-list)
-   "Create barre indications for a chord diagram"
-   (if (not (null? barre-list))
-     (let* ((string1 (caar barre-list))
-            (string2 (cadar barre-list))
-            (fret    (caddar barre-list))
-            (bottom (* size (+ 1.5 (- (cadr fret-range) fret))))
-            (left (* size (- string-count string1)))
-            (right (* size (- string-count string2)))
-            (bezier-list (make-bezier-sandwich-list left right bottom (* size 0.5) (* size 0.1)))
-            (sandwich-stencil (ly:make-stencil (list 'bezier-sandwich `(quote ,bezier-list) (* size 0.1) )
-                                  (cons 0 right)
-                                  (cons 0 (+ bottom (* size 0.8))))))
+        labeled-dot-stencil
+        (ly:stencil-add
+         (draw-dots
+          layout props string-count fret-count fret-range size finger-code
+          dot-position dot-radius dot-thickness restlist orientation)
+         labeled-dot-stencil))))
+
+(define (draw-xo layout props string-count fret-range size xo-list orientation)
+  "Put open and mute string indications on diagram, as contained in
+@var{xo-list}."
+  (let* ((details (chain-assoc-get 'fret-diagram-details props '()))
+         (fret-count (+ (- (cadr fret-range) (car fret-range) 1)))
+         (xo-font-mag
+          (* size (assoc-get 'xo-font-magnification details 0.5)))
+         (xo-horizontal-offset (* size -0.35))
+         (mypair (car xo-list))
+         (restlist (cdr xo-list))
+         (glyph-string (if (eq? (car mypair) 'mute)
+                           (assoc-get 'mute-string details "X")
+                           (assoc-get 'open-string details "O")))
+         (xpos
+          (+ (* (- string-count (cadr mypair)) size) xo-horizontal-offset ))
+         (glyph-stencil (if (eq? orientation 'normal)
+                            (ly:stencil-translate-axis
+                             (sans-serif-stencil
+                              layout props (* size xo-font-mag) glyph-string)
+                             xpos X)
+                            (ly:stencil-translate-axis
+                             (sans-serif-stencil
+                              layout props (* size xo-font-mag) glyph-string)
+                             xpos Y))))
+    (if (null? restlist)
+        glyph-stencil
+        (ly:stencil-add
+         (draw-xo
+          layout props string-count fret-range size restlist orientation)
+         glyph-stencil))))
+
+(define (make-bezier-sandwich-list start stop base height thickness orientation)
+  "Make the argument list for a bezier sandwich from
+@var{start} to @var{stop} with a baseline at @var{base}, a height of
+@var{height}, and a thickness of @var{thickness}.  If @var{orientation} is
+@var{'normal}, @var{base} is a y coordinate, otherwise it's an x coordinate."
+  (let* ((width (+ (- stop start) 1))
+         (x1 (+ (* width thickness) start))
+         (x2 (- stop (* width thickness)))
+         (bottom-control-point-height
+          (if (eq? orientation 'normal)
+              (+ base (- height thickness))
+              (- base (- height thickness))))
+         (top-control-point-height
+          (if (eq? orientation 'normal)
+	      (+ base height)
+	      (- base height))))
+ ; order of bezier control points is:
+ ;    left cp low, right cp low, right end low, left end low
+ ;    right cp high, left cp high, left end high, right end high.
+    (if (eq? orientation 'normal)
+	(list (cons x1 bottom-control-point-height)
+	      (cons x2 bottom-control-point-height)
+	      (cons stop base)
+	      (cons start base)
+	      (cons x2 top-control-point-height)
+	      (cons x1 top-control-point-height)
+	      (cons start base)
+	      (cons stop base))
+	(list (cons bottom-control-point-height x1)
+	      (cons bottom-control-point-height x2)
+	      (cons base stop)
+	      (cons base start)
+	      (cons top-control-point-height x2)
+	      (cons top-control-point-height x1)
+	      (cons base start)
+	      (cons base stop)))))
+
+(define (draw-barre layout props string-count fret-range
+		    size finger-code dot-position dot-radius
+		    barre-list orientation)
+  "Create barre indications for a fret diagram"
+  (if (not (null? barre-list))
+      (let* ((details (chain-assoc-get 'fret-diagram-details props '()))
+	     (string1 (caar barre-list))
+	     (string2 (cadar barre-list))
+	     (fret (caddar barre-list))
+	     (top-fret (cadr fret-range))
+	     (low-fret (car fret-range))
+	     (barre-type (assoc-get 'barre-type details 'curved))
+	     (scale-dot-radius (* size dot-radius))
+	     (barre-vertical-offset 0.5)
+	     ;; 2 is 1 for empty fret at bottom of figure + 1 for interval
+	     ;; (top-fret - fret + 1) -- not an arbitrary constant
+	     (dot-center-y
+	      (* size (- (+ 2 (- (cadr fret-range) fret)) dot-position)))
+	     (dot-center-fret-coordinate (+ (- fret low-fret) dot-position))
+	     (barre-fret-coordinate
+	      (+ dot-center-fret-coordinate
+		 (* (- barre-vertical-offset 0.5) dot-radius)))
+	     (barre-start-string-coordinate (- string-count string1))
+	     (barre-end-string-coordinate (- string-count string2))
+	     (bottom
+	      (+ dot-center-y (* barre-vertical-offset scale-dot-radius)))
+	     (left (* size (- string-count string1)))
+	     (right (* size (- string-count string2)))
+	     (bezier-thick 0.1)
+	     (bezier-height 0.5)
+	     (bezier-list
+	      (if (eq? orientation 'normal)
+		  (make-bezier-sandwich-list
+		   (* size barre-start-string-coordinate)
+		   (* size barre-end-string-coordinate)
+                   (* size (+ 2 (- top-fret 
+                                   (+ low-fret barre-fret-coordinate))))
+		   (* size bezier-height)
+		   (* size bezier-thick)
+		   orientation)
+		  (make-bezier-sandwich-list
+		   (* size barre-start-string-coordinate)
+		   (* size barre-end-string-coordinate)
+		   (* size barre-fret-coordinate)
+		   (* size bezier-height)
+		   (* size bezier-thick)
+		   orientation)))
+             (barre-stencil
+              (if (eq? barre-type 'straight)
+                  (if (eq? orientation 'normal)
+                      (ly:make-stencil
+                       (list
+                        'draw-line (* size dot-radius) left dot-center-y
+                        right dot-center-y)
+                       (cons left right)
+                       (cons (- dot-center-y scale-dot-radius)
+                             (+ dot-center-y scale-dot-radius)))
+                      (ly:make-stencil
+                       (list 'draw-line (* size dot-radius)
+                             (* size barre-fret-coordinate)
+                             (* size barre-start-string-coordinate)
+                             (* size barre-fret-coordinate)
+                             (* size barre-end-string-coordinate))
+                       (cons (- (* size barre-fret-coordinate)
+                                scale-dot-radius)
+                             (+ (* size barre-fret-coordinate)
+                                scale-dot-radius))
+                       (cons (* size barre-start-string-coordinate)
+                             (* size barre-end-string-coordinate))))
+                  (if (eq? orientation 'normal)
+                      (ly:make-stencil
+                       (list 'bezier-sandwich
+                             `(quote ,bezier-list)
+                             (* size bezier-thick))
+                       (cons left right)
+                       (cons bottom (+ bottom (* size bezier-height))))
+                      (ly:make-stencil
+                       (list 'bezier-sandwich
+                             `(quote ,bezier-list)
+                             (* size bezier-thick))
+                       (cons bottom (+ bottom (* size bezier-height)))
+                       (cons left right))))))
         (if (not (null? (cdr barre-list)))
-            (ly:stencil-add sandwich-stencil
-                 (draw-barre paper string-count fret-range size (cdr barre-list)))
-            sandwich-stencil ))))
- 
-(define (label-fret paper string-count fret-range size)
-   "Label the base fret on a fret diagram"
-   (let ((base-fret (car fret-range))
-         (fret-count (+ (- (cadr fret-range) (car fret-range)) 1))
-         (font (ly:paper-get-font paper `(((font-magnification . ,(* 0.8 size))(font-name . "cmss8")
-                                        (font-encoding Tex-text))))))
-     (ly:stencil-translate-axis 
-        (ly:stencil-translate-axis (fontify-text font (if (> base-fret 1)
-                                                          (format #f "~(~:@r~)" base-fret)
-                                                          " ")) (* (- string-count 0.5) size) X)
-        (* (- fret-count 0.2) size) Y)))
-            
+            (ly:stencil-add
+	     barre-stencil
+	     (draw-barre layout props string-count fret-range size finger-code
+			 dot-position dot-radius (cdr barre-list)))
+            barre-stencil ))))
+
+(define (stepmag mag)
+  "Calculate the font step necessary to get a desired magnification"
+  (* 6 (/ (log mag) (log 2))))
+
+(define (label-fret layout props string-count fret-range size orientation)
+  "Label the base fret on a fret diagram"
+  (let* ((details (chain-assoc-get 'fret-diagram-details props '()))
+	 (base-fret (car fret-range))
+	 (label-font-mag (assoc-get 'fret-label-font-mag details 0.5))
+	 (label-vertical-offset
+	  (assoc-get 'fret-label-vertical-offset details -0.2))
+	 (number-type (assoc-get 'number-type details 'roman-lower))
+	 (fret-count (+ (- (cadr fret-range) (car fret-range)) 1))
+	 (label-text
+	  (cond
+           ((equal? number-type 'roman-lower)
+	    (fancy-format #f "~(~@r~)" base-fret))
+           ((equal? number-type 'roman-upper)
+	    (fancy-format #f "~@r" base-fret))
+           ((equal? 'arabic number-type)
+	    (fancy-format #f "~d" base-fret))
+           (else (fancy-format #f "~(~@r~)" base-fret)))))
+    (if (eq? orientation 'normal)
+	(ly:stencil-translate-axis
+	 (sans-serif-stencil layout props (* size label-font-mag) label-text)
+	 (* size (+ fret-count label-vertical-offset)) Y)
+	(ly:stencil-translate-axis
+	 (sans-serif-stencil layout props (* size label-font-mag) label-text)
+	 (* size (+ 1 label-vertical-offset)) X))))
+
+(define-builtin-markup-command (fret-diagram-verbose layout props marking-list)
+  (list?) ; argument type
+  fret-diagram ; markup type
+  ((align-dir -0.4) ; properties and defaults
+   (size 1.0)
+   (fret-diagram-details)
+   (thickness 0.5))
+  "Make a fret diagram containing the symbols indicated in @var{marking-list}.
+
+  For example,
+
+@example
+\\markup \\fret-diagram-verbose
+  #'((mute 6) (mute 5) (open 4)
+     (place-fret 3 2) (place-fret 2 3) (place-fret 1 2))
+@end example
+
+@noindent
+produces a standard D@tie{}chord diagram without fingering indications.
+
+Possible elements in @var{marking-list}:
+
+@table @code
+@item (mute @var{string-number})
+Place a small @q{x} at the top of string @var{string-number}.
+
+@item (open @var{string-number})
+Place a small @q{o} at the top of string @var{string-number}.
+
+@item (barre @var{start-string} @var{end-string} @var{fret-number})
+Place a barre indicator (much like a tie) from string @var{start-string}
+to string @var{end-string} at fret @var{fret-number}.
+
+@item (place-fret @var{string-number} @var{fret-number} @var{finger-value})
+Place a fret playing indication on string @var{string-number} at fret
+@var{fret-number} with an optional fingering label @var{finger-value}.
+By default, the fret playing indicator is a solid dot.  This can be
+changed by setting the value of the variable @var{dot-color}.  If the
+@var{finger} part of the @code{place-fret} element is present,
+@var{finger-value} will be displayed according to the setting of the
+variable @var{finger-code}.  There is no limit to the number of fret
+indications per string.
+@end table"
+
+  (make-fret-diagram layout props marking-list))
+
+(define (make-fret-diagram layout props marking-list)
+  "Make a fret diagram markup"
+  (let* (
+         ; note: here we get items from props that are needed in this routine,
+	 ; or that are needed in more than one of the procedures
+	 ; called from this routine.  If they're only used in one of the
+	 ; sub-procedure, they're obtained in that procedure
+         (size (chain-assoc-get 'size props 1.0)) ; needed for everything
+;TODO -- get string-count directly from length of stringTunings;
+;         from FretBoard engraver, but not from markup call
+;TODO -- adjust padding for fret label?  it appears to be too close to dots
+         (details
+	  (chain-assoc-get
+	   'fret-diagram-details props '())) ; fret diagram details
+         (string-count
+	  (assoc-get 'string-count details 6)) ; needed for everything
+         (fret-count
+	  (assoc-get 'fret-count details 4)) ; needed for everything
+         (orientation
+	  (assoc-get 'orientation details 'normal)) ; needed for everything
+         (finger-code
+	  (assoc-get
+	   'finger-code details 'none)) ; needed for draw-dots and draw-barre
+         (default-dot-radius
+	   (if (eq? finger-code 'in-dot) 0.425 0.25)) ; bigger dots if labeled
+         (default-dot-position
+	   (if (eq? finger-code 'in-dot)
+	       (- 0.95 default-dot-radius)
+	       0.6)) ; move up to make room for bigger if labeled
+         (dot-radius
+	  (assoc-get
+	   'dot-radius details default-dot-radius))  ; needed for draw-dots
+                                                     ; and draw-barre
+         (dot-position
+	  (assoc-get
+	   'dot-position details default-dot-position)) ; needed for draw-dots
+                                                        ; and draw-barre
+         (th
+	  (* (ly:output-def-lookup layout 'line-thickness)
+	     (chain-assoc-get 'thickness props 0.5))) ; needed for draw-frets
+                                                      ; and draw-strings
+         (alignment
+	  (chain-assoc-get 'align-dir props -0.4)) ; needed only here
+         (xo-padding
+	  (* size (assoc-get 'xo-padding details 0.2))) ; needed only here
+         (label-space (* 0.25 size))
+         (label-dir (assoc-get 'label-dir details RIGHT))
+         (parameters (fret-parse-marking-list marking-list fret-count))
+         (dot-list (cdr (assoc 'dot-list parameters)))
+         (xo-list (cdr (assoc 'xo-list parameters)))
+         (fret-range (cdr (assoc 'fret-range parameters)))
+         (barre-list (cdr (assoc 'barre-list parameters)))
+         (barre-type
+          (assoc-get 'barre-type details 'curved))
+         (fret-diagram-stencil
+	  (ly:stencil-add
+	   (draw-strings string-count fret-range th size orientation)
+	   (draw-frets fret-range string-count th size orientation))))
+    (if (and (not (null? barre-list))
+             (not (eq? 'none barre-type)))
+	(set! fret-diagram-stencil
+	      (ly:stencil-add
+	       (draw-barre layout props string-count fret-range size
+			   finger-code dot-position dot-radius
+			   barre-list orientation)
+	       fret-diagram-stencil)))
+    (if (not (null? dot-list))
+        (set! fret-diagram-stencil
+	      (ly:stencil-add
+	       fret-diagram-stencil
+	       (draw-dots layout props string-count fret-count fret-range
+			  size finger-code dot-position dot-radius
+			  th dot-list orientation))))
+    (if (= (car fret-range) 1)
+	(set! fret-diagram-stencil
+	      (if (eq? orientation 'normal)
+		  (ly:stencil-combine-at-edge
+		   fret-diagram-stencil Y UP
+		   (draw-thick-zero-fret
+		    props string-count th size orientation))
+		  (ly:stencil-combine-at-edge
+		   fret-diagram-stencil X LEFT
+		   (draw-thick-zero-fret
+		    props string-count th size orientation)))))
+    (if (not (null? xo-list))
+	(set! fret-diagram-stencil
+	      (if (eq? orientation 'normal)
+		  (ly:stencil-combine-at-edge
+		   fret-diagram-stencil Y UP
+		   (draw-xo layout props string-count fret-range
+			    size xo-list orientation)
+		   xo-padding )
+		  (ly:stencil-combine-at-edge
+		   fret-diagram-stencil X LEFT
+		   (draw-xo layout props string-count fret-range
+			    size xo-list orientation)
+		   xo-padding))))
+    (if (> (car fret-range) 1)
+	(set! fret-diagram-stencil
+	      (if (eq? orientation 'normal)
+		  (ly:stencil-combine-at-edge
+		   fret-diagram-stencil X label-dir
+		   (label-fret layout props string-count fret-range
+			       size orientation)
+		   label-space)
+		  (ly:stencil-combine-at-edge
+		   fret-diagram-stencil Y label-dir
+		   (label-fret layout props string-count fret-range
+			       size orientation)
+		   label-space))))
+    (ly:stencil-aligned-to fret-diagram-stencil X alignment)))
+
+(define-builtin-markup-command (fret-diagram layout props definition-string)
+  (string?) ; argument type
+  fret-diagram ; markup category
+  (fret-diagram-verbose-markup) ; properties and defaults
+  "Make a (guitar) fret diagram.  For example, say
+
+@example
+\\markup \\fret-diagram #\"s:0.75;6-x;5-x;4-o;3-2;2-3;1-2;\"
+@end example
+
+@noindent
+for fret spacing 3/4 of staff space, D chord diagram
+
+Syntax rules for @var{definition-string}:
+@itemize @minus
+
+@item
+Diagram items are separated by semicolons.
+
+@item
+Possible items:
+
+@itemize @bullet
+@item
+@code{s:}@var{number} -- Set the fret spacing of the diagram (in staff
+spaces).
+Default:@tie{}1.
+
+@item
+@code{t:}@var{number} -- Set the line thickness (in staff spaces).
+Default:@tie{}0.05.
+
+@item
+@code{h:}@var{number} -- Set the height of the diagram in frets.
+Default:@tie{}4.
+
+@item
+@code{w:}@var{number} -- Set the width of the diagram in strings.
+Default:@tie{}6.
+
+@item
+@code{f:}@var{number} -- Set fingering label type
+ (0@tie{}= none, 1@tie{}= in circle on string, 2@tie{}= below string).
+Default:@tie{}0.
+
+@item
+@code{d:}@var{number} -- Set radius of dot, in terms of fret spacing.
+Default:@tie{}0.25.
+
+@item
+@code{p:}@var{number} -- Set the position of the dot in the fret space.
+0.5 is centered; 1@tie{}is on lower fret bar, 0@tie{}is on upper fret bar.
+Default:@tie{}0.6.
+
+@item
+@code{c:}@var{string1}@code{-}@var{string2}@code{-}@var{fret} -- Include a
+barre mark from @var{string1} to @var{string2} on @var{fret}.
+
+@item
+@var{string}@code{-}@var{fret} -- Place a dot on @var{string} at @var{fret}.
+If @var{fret} is @samp{o}, @var{string} is identified as open.
+If @var{fret} is @samp{x}, @var{string} is identified as muted.
+
+@item
+@var{string}@code{-}@var{fret}@code{-}@var{fingering} -- Place a dot on
+@var{string} at @var{fret}, and label with @var{fingering} as defined
+by the @code{f:} code.
+@end itemize
+
+@item
+Note: There is no limit to the number of fret indications per string.
+@end itemize"
+  (let ((definition-list
+	  (fret-parse-definition-string props definition-string)))
+    (fret-diagram-verbose-markup
+     layout (car definition-list) (cdr definition-list))))
+
+(define (fret-parse-definition-string props definition-string)
+ "Parse a fret diagram string and return a pair containing:
+  props, modified as necessary by the definition-string
+  a fret-indication list with the appropriate values"
+ (let* ((fret-count 4)
+	(string-count 6)
+	(fret-range (list 1 fret-count))
+	(barre-list '())
+	(dot-list '())
+	(xo-list '())
+	(output-list '())
+	(new-props '())
+	(details (merge-details 'fret-diagram-details props '()))
+	(items (string-split definition-string #\;)))
+   (let parse-item ((myitems items))
+     (if (not (null? (cdr myitems)))
+	 (let ((test-string (car myitems)))
+	   (case (car (string->list (substring test-string 0 1)))
+	     ((#\s) (let ((size (get-numeric-from-key test-string)))
+		      (set! props (prepend-alist-chain 'size size props))))
+	     ((#\f) (let* ((finger-code (get-numeric-from-key test-string))
+			   (finger-id (case finger-code
+					((0) 'none)
+					((1) 'in-dot)
+					((2) 'below-string))))
+		      (set! details
+			    (acons 'finger-code finger-id details))))
+	     ((#\c) (set! output-list
+			  (cons-fret
+			   (cons
+			    'barre
+			    (numerify
+			     (string-split (substring test-string 2) #\-)))
+			   output-list)))
+	     ((#\h) (let ((fret-count (get-numeric-from-key test-string)))
+		      (set! details
+			    (acons 'fret-count fret-count details))))
+	     ((#\w) (let ((string-count (get-numeric-from-key test-string)))
+		      (set! details
+			    (acons 'string-count string-count details))))
+	     ((#\d) (let ((dot-size (get-numeric-from-key test-string)))
+		      (set! details
+			    (acons 'dot-radius dot-size details))))
+	     ((#\p) (let ((dot-position (get-numeric-from-key test-string)))
+		      (set! details
+			    (acons 'dot-position dot-position details))))
+	     (else
+	      (let ((this-list (string-split test-string #\-)))
+		(if (string->number (cadr this-list))
+		    (set! output-list
+			  (cons-fret
+			   (cons 'place-fret (numerify this-list))
+			   output-list))
+		    (if (equal? (cadr this-list) "x" )
+			(set! output-list
+			      (cons-fret
+			       (list 'mute (string->number (car this-list)))
+			       output-list))
+			(set! output-list
+			      (cons-fret
+			       (list 'open (string->number (car this-list)))
+			       output-list)))))))
+	   (parse-item (cdr myitems)))))
+   ;  add the modified details
+   (set! props
+	 (prepend-alist-chain 'fret-diagram-details details props))
+   `(,props . ,output-list))) ;ugh -- hard-coded spell -- procedure better
+
+(define (cons-fret new-value old-list)
+  "Put together a fret-list in the format desired by parse-string"
+  (if (eq? old-list '())
+      (list new-value)
+      (cons* new-value old-list)))
+
 (define (get-numeric-from-key keystring)
- "Get the numeric value from a key  of the form k:val"
-    (string->number (substring keystring 2  (string-length keystring) )))
-    
+  "Get the numeric value from a key of the form k:val"
+  (string->number (substring keystring 2 (string-length keystring))))
+
 (define (numerify mylist)
- "Convert string values to numeric or character"
-     (if (null? mylist)
-         '()
-         (let ((numeric-value (string->number (car mylist))))
-             (if numeric-value
-                (cons* numeric-value (numerify (cdr mylist)))
-                (cons* (car (string->list (car mylist))) (numerify (cdr mylist)))))))
-           
-  
-(define (make-fret-diagram paper size definition-string)
-  "Make a fret diagram"
-  (let* ((parameters (fret-parse-string definition-string))
-         (string-count (cdr (assoc "string-count" parameters)))
-         (fret-range (cdr (assoc "fret-range" parameters)))
-         (finger-code (cdr (assoc "finger-code" parameters)))
-         (dot-size (cdr (assoc "dot-size" parameters)))
-         (position (cdr (assoc "position" parameters)))
-         (dot-list (cdr (assoc "dot-list" parameters)))
-         (xo-list (cdr (assoc "xo-list" parameters)))
-         (line-thickness (cdr (assoc "thickness" parameters)))
-         (barre-list (cdr (assoc "barre-list" parameters)))
-         (fret-diagram-stencil (ly:stencil-add
-                            (draw-strings string-count fret-range line-thickness size)
-                            (draw-frets paper fret-range string-count line-thickness size))))
-         (if (not (null? dot-list))
-             (set! fret-diagram-stencil (ly:stencil-add
-                                    (draw-dots paper string-count fret-range size dot-size position finger-code dot-list)
-                                    fret-diagram-stencil)))
-         (if (not (null? xo-list))
-             (set! fret-diagram-stencil (ly:stencil-add
-                                    (draw-xo paper string-count fret-range size xo-list)
-                                    fret-diagram-stencil)))
-         (if (not (null? barre-list))
-             (set! fret-diagram-stencil (ly:stencil-add
-                                    (draw-barre paper string-count fret-range size barre-list)
-                                    fret-diagram-stencil)))
-         (set! fret-diagram-stencil (ly:stencil-add  fret-diagram-stencil (label-fret paper string-count fret-range size)))
-         (ly:stencil-align-to! fret-diagram-stencil X -.4)
-         fret-diagram-stencil))
-
-(def-markup-command (fret-diagram paper props size definition-string)
-  (number? string?)
-  "Syntax: \\fret-diagram size definition-string
-   eg: \\markup \\fret-diagram #0.75 #\"6-x;5-x;4-o;3-2;2-3;1-2;\"
-    for fret spacing 3/4 of staff space, D chord diagram
-    Syntax rules for @var{definition-string}:
-      Diagram items are separated by semicolons.
-      Possible items:
-      t:number -- set the line thickness (in staff spaces).  Default 0.05
-      h:number -- set the height of the diagram in frets.  Default 4
-      w:number -- set the width of the diagram in strings.  Default 6
-      f:number -- set fingering label type 
-                  (0 = none, 1 = in circle on string, 2 = below string)  Default 0
-      d:number -- set radius of dot, in terms of fret spacing.  Default 0.25
-      p:number -- set the position of the dot in the fret space. 0.5 is centered; 1 is on lower fret bar,
-                  0 is on upper fret bar.  Default 0.6 
-      c:string1-string2-fret -- include a barre mark from string1 to string2 on fret
-      string-fret -- place a dot on string at fret.  If fret is o, string is identified
-                     as open.  If fret is x, string is identified as muted.
-      string-fret-fingering -- place a dot on string at fret, and label with fingering as 
-                               defined by f: code.
-    Note:  There is no limit to the number of fret indications per string."
-       (make-fret-diagram paper size definition-string))
+  "Convert string values to numeric or character"
+  (if (null? mylist)
+      '()
+      (let ((numeric-value (string->number (car mylist))))
+	(if numeric-value
+	    (cons* numeric-value (numerify (cdr mylist)))
+	    (cons* (car (string->list (car mylist)))
+		   (numerify (cdr mylist)))))))
+
+(define-builtin-markup-command
+  (fret-diagram-terse layout props definition-string)
+  (string?) ; argument type
+  fret-diagram ; markup category
+  (fret-diagram-verbose-markup) ; properties
+  "Make a fret diagram markup using terse string-based syntax.
+
+Here is an example
+
+@example
+\\markup \\fret-diagram-terse #\"x;x;o;2;3;2;\"
+@end example
+
+@noindent
+for a D@tie{}chord diagram.
+
+Syntax rules for @var{definition-string}:
+
+@itemize @bullet
+
+@item
+Strings are terminated by semicolons; the number of semicolons
+is the number of strings in the diagram.
+
+@item
+Mute strings are indicated by @samp{x}.
+
+@item
+Open strings are indicated by @samp{o}.
+
+@item
+A number indicates a fret indication at that fret.
+
+@item
+If there are multiple fret indicators desired on a string, they
+should be separated by spaces.
+
+@item
+Fingerings are given by following the fret number with a @code{-},
+followed by the finger indicator, e.g. @samp{3-2} for playing the third
+fret with the second finger.
+
+@item
+Where a barre indicator is desired, follow the fret (or fingering) symbol
+with @code{-(} to start a barre and @code{-)} to end the barre.
+
+@end itemize"
+  ;; TODO -- change syntax to fret\string-finger
+  (let ((definition-list
+	  (fret-parse-terse-definition-string props definition-string)))
+    (fret-diagram-verbose-markup layout
+				 (car definition-list)
+				 (cdr definition-list))))
+
+(define-public 
+  (fret-parse-terse-definition-string props definition-string)
+  "Parse a fret diagram string that uses terse syntax; return a pair containing:
+    props, modified to include the string-count determined by the
+    definition-string, and
+    a fret-indication list with the appropriate values"
+;TODO -- change syntax to fret\string-finger
+
+  (let* ((details (merge-details 'fret-diagram-details props '()))
+	 (barre-start-list '())
+	 (output-list '())
+	 (new-props '())
+	 (items (string-split definition-string #\;))
+	 (string-count (- (length items) 1)))
+    (let parse-item ((myitems items))
+      (if (not (null? (cdr myitems)))
+	  (let* ((test-string (car myitems))
+		 (current-string (- (length myitems) 1))
+		 (indicators (string-split test-string #\ )))
+	    (let parse-indicators ((myindicators indicators))
+	      (if (not (eq? '() myindicators))
+		  (let* ((this-list (string-split (car myindicators) #\-))
+			 (max-element-index (- (length this-list) 1))
+			 (last-element
+			  (car (list-tail this-list max-element-index)))
+			 (fret
+			  (if (string->number (car this-list))
+			      (string->number (car this-list))
+			      (car this-list))))
+		    (if (equal? last-element "(")
+			(begin
+			  (set! barre-start-list
+				(cons-fret (list current-string fret)
+					   barre-start-list))
+			  (set! this-list
+				(list-head this-list max-element-index))))
+		    (if (equal? last-element ")")
+			(let* ((this-barre
+				(get-sub-list fret barre-start-list))
+			       (insert-index (- (length this-barre) 1)))
+			  (set! output-list
+				(cons-fret (cons* 'barre
+						  (car this-barre)
+						  current-string
+						  (cdr this-barre))
+					   output-list))
+			  (set! this-list
+				(list-head this-list max-element-index))))
+		    (if (number? fret)
+			(set!
+			 output-list
+			 (cons-fret (cons*
+				     'place-fret
+				     current-string
+				     (drop-paren (numerify this-list)))
+				    output-list))
+			(if (equal? (car this-list) "x" )
+			    (set!
+			     output-list
+			     (cons-fret
+			      (list 'mute current-string)
+			      output-list))
+			    (set!
+			     output-list
+			     (cons-fret
+			      (list 'open current-string)
+			      output-list))))
+		    (parse-indicators (cdr myindicators)))))
+	    (parse-item (cdr myitems)))))
+    (set! details (acons 'string-count string-count details))
+    (set! props (prepend-alist-chain 'fret-diagram-details details props))
+    `(,props . ,output-list))) ; ugh -- hard coded; proc is better
+
+(define (drop-paren item-list)
+  "Drop a final parentheses from a fret indication list
+   resulting from a terse string specification of barre."
+  (if (> (length item-list) 0)
+      (let* ((max-index (- (length item-list) 1))
+	     (last-element (car (list-tail item-list max-index))))
+	(if (or (equal? last-element ")") (equal? last-element "("))
+	    (list-head item-list max-index)
+	    item-list))
+      item-list))
+
+(define (get-sub-list value master-list)
+  "Get a sub-list whose cadr is equal to @var{value} from @var{master-list}"
+  (if (eq? master-list '())
+      #f
+      (let ((sublist (car master-list)))
+	(if (equal? (cadr sublist) value)
+	    sublist
+	    (get-sub-list value (cdr master-list))))))
+
+(define (merge-details key alist-list . default)
+  "Return ALIST-LIST entries for key, in one combined alist.
+  There can be two ALIST-LIST entries for a given key. The first
+  comes from the override-markup function, the second comes
+  from property settings during a regular override.
+  This is necessary because some details can be set in one
+  place, while others are set in the other.  Both details
+  lists must be merged into a single alist.
+  Return DEFAULT (optional, else #f) if not
+  found."
+
+  (define (helper key alist-list default)
+    (if (null? alist-list)
+	default
+	(let* ((handle (assoc key (car alist-list))))
+	  (if (pair? handle)
+	      (append (cdr handle) (chain-assoc-get key (cdr alist-list) '()))
+	      (helper key (cdr alist-list) default)))))
+
+  (helper key alist-list
+	  (if (pair? default) (car default) #f)))