MusicXML testsuite: Fix compilation for out-of-source builds...

[lilypond.git] / scm / modal-transforms.scm

diff --git a/scm/modal-transforms.scm b/scm/modal-transforms.scm
index cdaa015ccc08099c251c51304ece2c77a66c61d9..151fb8c3be06edcea7e213291989398428d43fea 100644 (file)
--- a/scm/modal-transforms.scm
+++ b/scm/modal-transforms.scm
@@ -220,3 +220,20 @@ Typically used to construct a scale for input to transposer-factory
     (map retrograde-music reversed)
 
     music))
+
+(define-public (pitch-invert around to music)
+  "If @var{music} is a single pitch, inverts it about @var{around}
+and transposes from @var{around} to @var{to}."
+  (let ((p (ly:music-property music 'pitch)))
+    (if (ly:pitch? p)
+       (ly:music-set-property!
+        music 'pitch
+        (ly:pitch-transpose to (ly:pitch-diff around p))))
+    music))
+
+(define-public (music-invert around-pitch to-pitch music)
+  "Applies pitch-invert to all pitches in @var{music}."
+  (let ((around (car (extract-pitch-sequence around-pitch)))
+       (to (car (extract-pitch-sequence to-pitch))))
+     (music-map (lambda (x) (pitch-invert around to x)) music)))
+