+/*
+ TODO
+ it might be interesting to split off the footnotes as well, ie.
+
+ get_footnotes(SCM expr, SCM* footnotes, SCM* cleaned)
+
+ by doing it this way and overwriting the old expr in the caller,
+ you can make sure nobody tries to handle footnotes differently
+ downstream.
+*/
+SCM
+get_footnotes (SCM expr)
+{
+ if (!scm_is_pair (expr))
+ return SCM_EOL;
+
+ SCM head = scm_car (expr);
+
+ if (scm_is_eq (head, ly_symbol2scm ("delay-stencil-evaluation")))
+ {
+ // we likely need to do something here...just don't know what...
+ return SCM_EOL;
+ }
+
+ if (scm_is_eq (head, ly_symbol2scm ("combine-stencil")))
+ {
+ SCM out = SCM_EOL;
+ SCM *tail = &out;
+
+ for (SCM x = scm_cdr (expr); scm_is_pair (x); x = scm_cdr (x))
+ {
+ SCM footnote = get_footnotes (scm_car (x));
+ if (!scm_is_null (footnote))
+ {
+ *tail = scm_cons (footnote, SCM_EOL);
+ tail = SCM_CDRLOC (*tail);
+ }
+ }
+ return scm_append (out);
+ }
+ if (scm_is_eq (head, ly_symbol2scm ("translate-stencil")))
+ return get_footnotes (scm_caddr (expr));
+
+ if (scm_is_eq (head, ly_symbol2scm ("footnote")))
+ return scm_list_1 (scm_cdr (expr));
+
+ return SCM_EOL;
+}
+