;;;; clef.scm -- Clef settings
;;;;
;;;; source file of the GNU LilyPond music typesetter
;;;;
;;;; (c) 2004--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>


;; (name . (glyph clef-position octavation))
;;
;; -- the name clefOctavation is misleading. The value 7 is 1 octave,
;; not 7 Octaves.
(define-public supported-clefs
  '(("treble" . ("clefs.G" -2 0))
    ("violin" . ("clefs.G" -2 0))
    ("G" . ("clefs.G" -2 0))
    ("G2" . ("clefs.G" -2 0))
    ("french" . ("clefs.G" -4 0))
    ("soprano" . ("clefs.C" -4 0))
    ("mezzosoprano" . ("clefs.C" -2 0))
    ("alto" . ("clefs.C" 0 0))
    ("C" . ("clefs.C" 0 0))
    ("tenor" . ("clefs.C" 2 0))
    ("baritone" . ("clefs.C" 4 0))
    ("varbaritone" . ("clefs.F" 0 0))
    ("bass" . ("clefs.F" 2 0))
    ("F" . ("clefs.F" 2 0))
    ("subbass" . ("clefs.F" 4 0))
    ("percussion" . ("clefs.percussion" 0 0))
    ("tab" . ("clefs.tab" 0 0))

    ;; should move mensural stuff to separate file?
    ("vaticana-do1" . ("clefs.vaticana.do" -1 0))
    ("vaticana-do2" . ("clefs.vaticana.do" 1 0))
    ("vaticana-do3" . ("clefs.vaticana.do" 3 0))
    ("vaticana-fa1" . ("clefs.vaticana.fa" -1 0))

    ("vaticana-fa2" . ("clefs.vaticana.fa" 1 0))
    ("medicaea-do1" . ("clefs.medicaea.do" -1 0))
    ("medicaea-do2" . ("clefs.medicaea.do" 1 0))
    ("medicaea-do3" . ("clefs.medicaea.do" 3 0))
    ("medicaea-fa1" . ("clefs.medicaea.fa" -1 0))
    ("medicaea-fa2" . ("clefs.medicaea.fa" 1 0))
    ("hufnagel-do1" . ("clefs.hufnagel.do" -1 0))
    ("hufnagel-do2" . ("clefs.hufnagel.do" 1 0))
    ("hufnagel-do3" . ("clefs.hufnagel.do" 3 0))
    ("hufnagel-fa1" . ("clefs.hufnagel.fa" -1 0))
    ("hufnagel-fa2" . ("clefs.hufnagel.fa" 1 0))
    ("hufnagel-do-fa" . ("clefs.hufnagel.do.fa" 4 0))
    ("mensural-c1" . ("clefs.mensural.c" -2 0))
    ("mensural-c2" . ("clefs.mensural.c" 0 0))
    ("mensural-c3" . ("clefs.mensural.c" 2 0))
    ("mensural-c4" . ("clefs.mensural.c" 4 0))
    ("mensural-f" . ("clefs.mensural.f" 2 0))
    ("mensural-g" . ("clefs.mensural.g" -2 0))
    ("neomensural-c1" . ("clefs.neomensural.c" -4 0))
    ("neomensural-c2" . ("clefs.neomensural.c" -2 0))
    ("neomensural-c3" . ("clefs.neomensural.c" 0 0))
    ("neomensural-c4" . ("clefs.neomensural.c" 2 0))
    ("petrucci-c1" . ("clefs.petrucci.c1" -4 0))
    ("petrucci-c2" . ("clefs.petrucci.c2" -2 0))
    ("petrucci-c3" . ("clefs.petrucci.c3" 0 0))
    ("petrucci-c4" . ("clefs.petrucci.c4" 2 0))
    ("petrucci-c5" . ("clefs.petrucci.c5" 4 0))
    ("petrucci-f3" . ("clefs.petrucci.f" 0 0))
    ("petrucci-f4" . ("clefs.petrucci.f" 2 0))
    ("petrucci-f" . ("clefs.petrucci.f" 2 0))
    ("petrucci-g" . ("clefs.petrucci.g" -2 0))))

;; "an alist mapping GLYPHNAME to the position of the middle C for
;; that symbol"
(define c0-pitch-alist
  '(("clefs.G" . -4)
    ("clefs.C" . 0)
    ("clefs.F" . 4)
    ("clefs.percussion" . 0)
    ("clefs.tab" . 0 )
    ("clefs.vaticana.do" . 0)
    ("clefs.vaticana.fa" . 4)
    ("clefs.medicaea.do" . 0)
    ("clefs.medicaea.fa" . 4)
    ("clefs.hufnagel.do" . 0)
    ("clefs.hufnagel.fa" . 4)
    ("clefs.hufnagel.do.fa" . 0)
    ("clefs.mensural.c" . 0)
    ("clefs.mensural.f" . 4)
    ("clefs.mensural.g" . -4)
    ("clefs.neomensural.c" . 0)
    ("clefs.petrucci.c1" . 0)
    ("clefs.petrucci.c2" . 0)
    ("clefs.petrucci.c3" . 0)
    ("clefs.petrucci.c4" . 0)
    ("clefs.petrucci.c5" . 0)
    ("clefs.petrucci.f" . 4)
    ("clefs.petrucci.g" . -4)))

(define-public (make-clef-set clef-name)
  "Generate the clef setting commands for a clef with name CLEF-NAME."
  (define (make-prop-set props)
    (let ((m (make-music 'PropertySet)))
      (map (lambda (x) (set! (ly:music-property m (car x)) (cdr x))) props)
      m))
  (let ((e '())
	(c0 0)
	(oct 0)
	(match (string-match "^(.*)([_^])([0-9]+)$" clef-name)))
    (if match
	(begin
	  (set! clef-name (match:substring match 1))
	  (set! oct
		(* (if (equal? (match:substring match 2) "^") -1 1)
		   (- (string->number (match:substring match 3)) 1)))))
    (set! e (assoc clef-name supported-clefs))
    (if (pair? e)
	(let* ((musics (map make-prop-set
			    `(((symbol . clefGlyph) (value . ,(cadr e)))
			      ((symbol . middleCClefPosition)
			       (value . ,(+ oct
					    (caddr e)
					    (cdr (assoc (cadr e) c0-pitch-alist)))))
			      ((symbol . clefPosition) (value . ,(caddr e)))
			      ((symbol . clefOctavation) (value . ,(- oct))))))
	       (recalc-mid-C (make-music 'ApplyContext))
	       (seq (make-music 'SequentialMusic
				'elements (append musics (list recalc-mid-C))))
	       (csp (make-music 'ContextSpeccedMusic)))
	  (set! (ly:music-property recalc-mid-C 'procedure) ly:set-middle-C!)
	  (context-spec-music seq 'Staff))
	(begin
	  (ly:warning (_ "unknown clef type `~a'") clef-name)
	  (ly:warning (_ "supported clefs: ~a")
		      (string-join
		       (sort (map car supported-clefs) string<?)))
	  (make-music 'Music)))))

