🐛 Show citations with an error (#93)

src/citations.tsx

@@ -0,0 +1,20 @@
+import type { Plugin } from 'unified';
+import type { Root } from 'myst-spec';
+import type { GenericNode } from 'myst-common';
+import { selectAll } from 'unist-util-select';
+
+/**
+ * Add fake children to the citations
+ */
+export async function addCiteChildrenTransform(tree: Root): Promise<void> {
+  const links = selectAll('cite', tree) as GenericNode[];
+  links.forEach(async cite => {
+    if (cite.children && cite.children.length > 0) return;
+    cite.error = true;
+    cite.children = [{ type: 'text', value: cite.label }];
+  });
+}
+
+export const addCiteChildrenPlugin: Plugin<[], Root, Root> = () => tree => {
+  addCiteChildrenTransform(tree);
+};

src/myst.ts

@@ -33,6 +33,7 @@ import { StaticNotebook } from '@jupyterlab/notebook';
 import { getCellList } from './utils';
 import { imageUrlSourceTransform } from './images';
 import { internalLinksPlugin } from './links';
+import { addCiteChildrenPlugin } from './citations';
 
 const evalRole: RoleSpec = {
   name: 'eval',
@@ -125,6 +126,7 @@ export function parseContent(
     .use(footnotesPlugin, { references })
     .use(resolveReferencesPlugin, { state })
     .use(internalLinksPlugin, { notebook })
+    .use(addCiteChildrenPlugin)
     .use(keysPlugin)
     .runSync(mdast as any, file);