cut-to-cue-number: Copy the hash table

This hash table will become the one which contains the cross-fade
functions.  Therefore, when we "emphatically" set it like this, it
must not be the same table as in the cue state itself.

1 files changed, 9 insertions, 1 deletions

diff --git a/guile/starlet/utils.scm b/guile/starlet/utils.scm
index 13ee585..be87321 100644
--- a/guile/starlet/utils.scm
+++ b/guile/starlet/utils.scm
@@ -1,6 +1,7 @@
 (define-module (starlet utils)
   #:export (return-unspecified
-            print-hash-table))
+            print-hash-table
+            copy-hash-table))
 
 
 (define (return-unspecified)
@@ -13,3 +14,10 @@
                    (display value)
                    (newline))
                  ht))
+
+(define (copy-hash-table ht)
+  (let ((new-ht (make-hash-table)))
+    (hash-for-each (lambda (key value)
+                     (hash-set! new-ht key value))
+                   ht)
+    new-ht))