use \footnotetext and \footnotemark to implement LaTeX footnotes

Author: yihui

src/cmark/latex.c

@@ -447,8 +447,20 @@ static int S_render_node(cmark_renderer *renderer, cmark_node *node,
     break;
 
   case CMARK_NODE_FOOTNOTE_DEFINITION:
+    if (entering) {
+      LIT("\\footnotetext[");
+      OUT(cmark_chunk_to_cstr(renderer->mem, &node->as.literal), false, LITERAL);
+      LIT("]{");
+    } else {
+      LIT("}");
+    }
+    break;
   case CMARK_NODE_FOOTNOTE_REFERENCE:
-    // TODO
+    if (entering) {
+      LIT("\\footnotemark[");
+      OUT(cmark_chunk_to_cstr(renderer->mem, &node->parent_footnote_def->as.literal), false, LITERAL);
+      LIT("]");
+    }
     break;
 
   default: