Fix and document usage of `convert-ly - < test.ly'.

[lilypond.git] / lily / grob-scheme.cc

diff --git a/lily/grob-scheme.cc b/lily/grob-scheme.cc
index e56e02d27a40c2e709d4ba18ad72df086005a48c..1fe50f00f18b49afb443c5a91ff6014f0c9c3321 100644 (file)
--- a/lily/grob-scheme.cc
+++ b/lily/grob-scheme.cc
@@ -453,3 +453,28 @@ LY_DEFINE (ly_grob_chain_callback, "ly:grob-chain-callback",
   chain_callback (gr, proc, sym);
   return SCM_UNSPECIFIED;
 }
+
+LY_DEFINE (ly_grob_vertical_less_p, "ly:grob-vertical<?",
+           2, 0, 0, (SCM a, SCM b),
+           "Does @var{a} lie above @var{b} on the page?")
+{
+  LY_ASSERT_SMOB (Grob, a, 1);
+  LY_ASSERT_SMOB (Grob, b, 2);
+
+  Grob *ga = unsmob_grob (a);
+  Grob *gb = unsmob_grob (b);
+
+  return ly_bool2scm (Grob::vertical_less (ga, gb));
+}
+
+LY_DEFINE (ly_grob_get_vertical_axis_group_index, "ly:grob-get-vertical-axis-group-index",
+           1, 0, 0, (SCM grob),
+           "Get the index of the vertical axis group the grob @var{grob} belongs to;"
+           " return @code{-1} if none is found.")
+{
+  Grob *gr = unsmob_grob (grob);
+
+  LY_ASSERT_SMOB (Grob, grob, 1);
+
+  return scm_from_int (Grob::get_vertical_axis_group_index (gr));
+}
\ No newline at end of file