Reviewers: ,
Message:
Please review.
Description:
Add Scheme function to return column associated with Item.
The C++ function PaperColumn::get_column is used frequently,
and it makes sense to have a Scheme function which performs
the same task. An example of a practical application
is the request by users to return the location of a particular
grob in a score: this is done by examining the PaperColumn
or NonMusicalPaperColumn associated with the grob.
Please review this at https://codereview.appspot.com/203910043/
Affected files (+15, -0 lines):
M lily/item-scheme.cc
Index: lily/item-scheme.cc
diff --git a/lily/item-scheme.cc b/lily/item-scheme.cc
index
0e6b71ef30a8191931495c3ff16bd6d9bb5fcadb..24ccf5bf0de97ba6666751afa514b2e777392c73
100644
--- a/lily/item-scheme.cc
+++ b/lily/item-scheme.cc
@@ -19,6 +19,7 @@
*/
#include "item.hh"
+#include "paper-column.hh"
LY_DEFINE (ly_item_p, "ly:item?",
1, 0, 0, (SCM g),
@@ -39,3 +40,17 @@ LY_DEFINE (ly_item_break_dir, "ly:item-break-dir",
Item *me = Item::unsmob (it);
return scm_from_int (me->break_status_dir ());
}
+
+LY_DEFINE (ly_item_get_column, "ly:item-get-column",
+ 1, 0, 0, (SCM it),
+ "Return the @code{PaperColumn} or @code{NonMusicalPaperColumn}"
+ " associated with this @code{Item}.")
+{
+ LY_ASSERT_SMOB (Item, it, 1);
+ Item *me = Item::unsmob (it);
+
+ if (Paper_column *col = me->get_column ())
+ return col->self_scm ();
+
+ return SCM_EOL;
+}
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