X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=input%2Ftest%2Fsmart-transpose.ly;h=f6e31ca57d6371580916aad70b7015374ce57132;hb=0c289671d105bea58592607cb508aef59aee882b;hp=3674d81008b030e4e746d782c1e741fba021099e;hpb=0817e0513d1016ff22a633b6fee20ddba2a062f2;p=lilypond.git

diff --git a/input/test/smart-transpose.ly b/input/test/smart-transpose.ly
index 3674d81008..f6e31ca57d 100644
--- a/input/test/smart-transpose.ly
+++ b/input/test/smart-transpose.ly
@@ -1,73 +1,82 @@
-\version "1.5.18"
+\version "2.10.0"
+\sourcefilename "smart-transpose.ly"
 
 \header {
-texidoc="
-@example
-    Here's a copy of my feature request :
-@quotation
-        Your task, if you accept it is to implement a \smarttranspose
-        command> that would translate such oddities into more natural
-        notations. Double accidentals should be removed, as well as E-sharp
-        (-> F), bC (-> B), bF (-> E), B-sharp (-> C).
-@end quotation
-
-You mean like this. (Sorry 'bout the nuked indentation.)
-
-Modified to use the standard transpose mechanism. The question is
-how useful these enharmonic modifications are. Mats B.
-@end example
+texidoc="@cindex Smart Transpose
+
+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  (unhair-pitch p)
-  (let* ((o (pitch-octave p))
-         (a (pitch-alteration p))
-         (n (pitch-notename p)))
+%
+% Modified to use the standard transpose mechanism. The question is
+% how useful these enharmonic modifications are. Mats B.
+% 
+% Why not to have a function that minimizes the number of accidentals? -HJJ
+% Works also for quarter tones. -HJJ
+%
+
+#(define  (naturalise-pitch p)
+  (let* ((o (ly:pitch-octave p))
+         (a (ly:pitch-alteration p))
+         (n (ly:pitch-notename p)))
 
     (cond
-     ((and (> a 0) (or (eq? n 6) (eq? n 2)))
-      (set! a (- a 1)) (set! n (+ n 1)))
-     ((and (< a 0) (or (eq? n 0) (eq? n 3)))
-      (set! a (+ a 1)) (set! n (- n 1))))
+     ((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
-     ((eq? a 2)  (set! a 0) (set! n (+ n 1)))
-     ((eq? a -2) (set! a 0) (set! n (- n 1))))
+     ((> 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))))
 
-    (make-pitch o n a)))
+    (ly:make-pitch o n a)))
 
-#(define (simplify music)
-  (let* ((es (ly-get-mus-property music 'elements))
-         (e (ly-get-mus-property music 'element))
-         (p (ly-get-mus-property music 'pitch)))
+#(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-set-mus-property
+        (ly:music-set-property!
          music 'elements
-         (map (lambda (x) (simplify x)) es)))
+         (map (lambda (x) (naturalise x)) es)))
 
-    (if (music? e)
-        (ly-set-mus-property
+    (if (ly:music? e)
+        (ly:music-set-property!
          music 'element
-         (simplify e)))
+         (naturalise e)))
 
-    (if (pitch? p)
+    (if (ly:pitch? p)
         (begin
-          (set! p (unhair-pitch p))
-          (ly-set-mus-property music 'pitch p)))
+          (set! p (naturalise-pitch p))
+          (ly:music-set-property! music 'pitch p)))
 
     music))
 
-music = \notes \relative c' { c4 d  e f g a b  c }
+music =  \relative c' { c4 d  e f g a b  c }
+
+naturaliseMusic =
+#(define-music-function (parser location m)
+					(ly:music?)
+			(naturalise m))
 
 \score {
-  \notes \context Staff {
-    \transpose ais' \music
-    \apply #simplify \transpose ais' \music
+   \context Staff {
+    \transpose c ais \music
+    \naturaliseMusic \transpose c ais \music
+    \transpose c deses \music
+    \naturaliseMusic \transpose c deses \music
   }
-  \paper { linewidth = -1. }
+  \layout { ragged-right = ##t}
 }