Reduce amount of consing (mostly replace reverse with reverse! where appropriate)

[lilypond.git] / scm / translation-functions.scm

diff --git a/scm/translation-functions.scm b/scm/translation-functions.scm
index cc94b67acfbeb2aae9c3364d577e937b4d89d5c5..a535497962c07b9ae8ca5d79d1faf3901d1b7e10 100644 (file)
--- a/scm/translation-functions.scm
+++ b/scm/translation-functions.scm
@@ -276,6 +276,10 @@ dot placement entries."
 along with @var{minimum-fret}, @var{maximum-stretch}, and
 @var{tuning}.  Returns a list of @code{(string fret finger) lists."
 
+
+    (define restrain-open-strings (ly:context-property context
+                                                      'restrainOpenStrings
+                                                      #f))
     (define specified-frets '())
     (define free-strings (iota (length tuning) 1))
 
@@ -326,7 +330,8 @@ if no string-number is present."
          #t
          (map (lambda (specced-fret)
                 (or (eq? 0 specced-fret)
-                     (eq? 0 fret)
+                    (and (not restrain-open-strings)
+                    (eq? 0 fret))
                     (>= maximum-stretch (abs (- fret specced-fret)))))
               specified-frets))))
 
@@ -334,7 +339,9 @@ if no string-number is present."
       "Can @var{pitch} be played on @var{string}, given already placed
 notes?"
       (let* ((fret (calc-fret pitch string tuning)))
-       (and (or (eq? fret 0) (>= fret minimum-fret))
+       (and (or (and (not restrain-open-strings)
+                     (eq? fret 0))
+                (>= fret minimum-fret))
             (close-enough fret))))
 
     (define (open-string string pitch)