-LY_DEFINE (ly_get_property, "ly:grob-property",
- 2, 0, 0, (SCM grob, SCM sym),
- "Return the value of a value in grob @var{g} of property @var{sym}. "
- "It will return @code{' ()} (end-of-list) "
- "if @var{sym} is undefined in @var{g}."
- "\n\n"
- )
+LY_DEFINE (ly_grob_set_nested_property_x, "ly:grob-set-nested-property!",
+ 3, 0, 0, (SCM grob, SCM symlist, SCM val),
+ "Set nested property @var{symlist} in grob @var{grob} to value @var{val}.")
+{
+ Grob *sc = unsmob_grob (grob);
+
+ LY_ASSERT_SMOB (Grob, grob, 1);
+
+ bool type_ok = ly_cheap_is_list (symlist);
+
+ if (type_ok)
+ for (SCM s = symlist; scm_is_pair (s) && type_ok; s = scm_cdr (s))
+ type_ok &= ly_is_symbol (scm_car (s));
+
+ SCM_ASSERT_TYPE (type_ok, symlist, SCM_ARG2, __FUNCTION__, "list of symbols");
+
+ set_nested_property (sc, symlist, val);
+ return SCM_UNSPECIFIED;
+}
+
+
+LY_DEFINE (ly_grob_property, "ly:grob-property",
+ 2, 1, 0, (SCM grob, SCM sym, SCM val),
+ "Return the value for property @var{sym} of @var{grob}."
+ " If no value is found, return @var{val} or @code{'()}"
+ " if @var{val} is not specified.")