+DEFUN ("invisible-p", Finvisible_p, Sinvisible_p, 1, 1, 0,
+ doc: /* Non-nil if the property makes the text invisible.
+POS-OR-PROP can be a marker or number, in which case it is taken to be
+a position in the current buffer and the value of the `invisible' property
+is checked; or it can be some other value, which is then presumed to be the
+value of the `invisible' property of the text of interest.
+The non-nil value returned can be t for truly invisible text or something
+else if the text is replaced by an ellipsis. */)
+ (pos_or_prop)
+ Lisp_Object pos_or_prop;
+{
+ Lisp_Object prop
+ = (NATNUMP (pos_or_prop) || MARKERP (pos_or_prop)
+ ? Fget_char_property (pos_or_prop, Qinvisible, Qnil)
+ : pos_or_prop);
+ int invis = TEXT_PROP_MEANS_INVISIBLE (prop);
+ return (invis == 0 ? Qnil
+ : invis == 1 ? Qt
+ : make_number (invis));
+}
+