use \footnotetext and \footnotemark to implement LaTeX footnotes

Author: yihui

src/cmark/latex.c

@@ -447,15 +447,21 @@ static int S_render_node(cmark_renderer *renderer, cmark_node *node,
     break;
 
   case CMARK_NODE_FOOTNOTE_DEFINITION:
-    break;
-  case CMARK_NODE_FOOTNOTE_REFERENCE:
     if (entering) {
-      LIT("\\footnote{");
-      // How can I get the footnote content here?
+      LIT("\\footnotetext[");
+      OUT(cmark_chunk_to_cstr(renderer->mem, &node->as.literal), false, LITERAL);
+      LIT("]{");
     } else {
       LIT("}");
     }
     break;
+  case CMARK_NODE_FOOTNOTE_REFERENCE:
+    if (entering) {
+      LIT("\\footnotemark[");
+      OUT(cmark_chunk_to_cstr(renderer->mem, &node->parent_footnote_def->as.literal), false, LITERAL);
+      LIT("]");
+    }
+    break;
 
   default:
     assert(false);