Generate file-level nodes if OrgDoc has ID.

This is for compatibility with Org-Roam v2.

_scripts/generate.py

@@ -83,6 +83,24 @@ def main(src_top, dest_top):
             # print("Skip:", relpath)
             continue
 
+        if doc.id is not None:
+            topHeadlines = doc.getTopHeadlines()
+
+            if ((len(topHeadlines) == 1 and related is None)
+                or (len(topHeadlines) == 2 and related is not None)):
+                endpath = os.path.join(dest_top, doc.id + ".node.html")
+
+                main_headline = [h for h in topHeadlines if h != related][0]
+                with open(endpath, "wt") as f:
+                    f.write(as_document(render(main_headline, doc)))
+                    files_generated += 1
+            else:
+                logging.error("Cannot render document from id: {}. {} headlines {} related".format(
+                    relpath,
+                    len(topHeadlines),
+                    'with' if related is not None else 'without'
+                ))
+
         for headline in headlines:
             endpath = os.path.join(dest_top, headline.id + ".node.html")