+
+/* FIXME: probably isn't the right place for this function */
+#include "context.hh"
+LY_DEFINE (ly_set_middle_C_x, "ly:set-middle-C!",
+ 1, 0, 0, (SCM context),
+ "Set the @code{middleCPosition} variable in @var{context}"
+ " based on the variables @code{middleCClefPosition} and"
+ " @code{middleCOffset}.")
+{
+ LY_ASSERT_SMOB (Context, context, 1);
+
+ Context *c = unsmob<Context> (context);
+ int clef_pos = robust_scm2int (c->get_property ("middleCClefPosition"), 0);
+ int offset = robust_scm2int (c->get_property ("middleCOffset"), 0);
+ /* middleCCuePosition overrides the clef! */
+ SCM cue_pos = c->get_property ("middleCCuePosition");
+ if (scm_is_number (cue_pos))
+ clef_pos = robust_scm2int (cue_pos, 0);
+
+ c->set_property (ly_symbol2scm ("middleCPosition"), scm_from_int (clef_pos + offset));
+ return SCM_UNSPECIFIED;
+}