+%% Do not edit this file; it is auto-generated from LSR!
+\version "2.11.23"
+
+\header { texidoc = "
+There is a way to enforce enharmonic modifications for notes in order
+to have the minimum number of accidentals. In that case, ``Double
+accidentals should be removed, as well as E-sharp (-> F), bC (-> B), bF
+(-> E), B-sharp (-> C).'', as proposed by a request for a new feature.
+In this manner, the most natural enharmonic notes are chosen in this
+example.
+" }
+
+#(define (naturalise-pitch p)
+ (let* ((o (ly:pitch-octave p))
+ (a (ly:pitch-alteration p))
+ (n (ly:pitch-notename p)))
+
+ (cond
+ ((and (> a 1) (or (eq? n 6) (eq? n 2)))
+ (set! a (- a 2))
+ (set! n (+ n 1)))
+ ((and (< a -1) (or (eq? n 0) (eq? n 3)))
+ (set! a (+ a 2))
+ (set! n (- n 1))))
+
+ (cond
+ ((> a 2) (set! a (- a 4)) (set! n (+ n 1)))
+ ((< a -2) (set! a (+ a 4)) (set! n (- n 1))))
+
+ (if (< n 0) (begin (set! o (- o 1)) (set! n (+ n 7))))
+ (if (> n 6) (begin (set! o (+ o 1)) (set! n (- n 7))))
+
+ (ly:make-pitch o n a)))
+
+#(define (naturalise music)
+ (let* ((es (ly:music-property music 'elements))
+ (e (ly:music-property music 'element))
+ (p (ly:music-property music 'pitch)))
+
+ (if (pair? es)
+ (ly:music-set-property!
+ music 'elements
+ (map (lambda (x) (naturalise x)) es)))
+
+ (if (ly:music? e)
+ (ly:music-set-property!
+ music 'element
+ (naturalise e)))
+
+ (if (ly:pitch? p)
+ (begin
+ (set! p (naturalise-pitch p))
+ (ly:music-set-property! music 'pitch p)))
+
+ music))
+
+music = \relative c' { c4 d e f g a b c }
+
+naturaliseMusic =
+#(define-music-function (parser location m)
+ (ly:music?)
+ (naturalise m))
+
+\score {
+ \context Staff {
+ \transpose c ais \music
+ \naturaliseMusic \transpose c ais \music
+ \transpose c deses \music
+ \naturaliseMusic \transpose c deses \music
+ }
+ \layout { ragged-right = ##t}
+}
+
+