fix: hashtag extraction and make remote links absolute

lib/helpers.ts

@@ -30,3 +30,49 @@ export const fixRenderedMarkdown = (content: string) => {
       }
     });
 };
+
+export async function fetchStream(url: string, cb: (chunk: string) => void) {
+  const response = await fetch(url);
+  const reader = response?.body?.getReader();
+  if (reader) {
+    while (true) {
+      const { done, value } = await reader.read();
+      if (done) return;
+      const data = new TextDecoder().decode(value);
+      data
+        .split("$")
+        .filter((d) => d && d.length)
+        .map((d) => cb(Array.isArray(d) ? d[0] : d));
+    }
+  }
+}
+
+export const createStreamResponse = () => {
+  let controller: ReadableStreamController<ArrayBufferView>;
+  const body = new ReadableStream({
+    start(cont) {
+      controller = cont;
+    },
+  });
+
+  const response = new Response(body, {
+    headers: {
+      "content-type": "text/plain",
+      "x-content-type-options": "nosniff",
+    },
+  });
+
+  function cancel() {
+    controller.close();
+  }
+
+  function enqueue(chunk: string) {
+    controller?.enqueue(new TextEncoder().encode("$" + chunk));
+  }
+
+  return {
+    response,
+    cancel,
+    enqueue,
+  };
+};