Update app.py

app.py

@@ -33,12 +33,17 @@ def call_llm(messages, model="deepseek/deepseek-chat-v3-0324:free", max_tokens=2
     return result["choices"][0]["message"]["content"]
 
 def get_sources(topic, domains):
+    query = topic
+    if domains and isinstance(domains, str):
+        domain_list = [d.strip() for d in domains.split(",") if d.strip()]
+        if domain_list:
+            query = " OR ".join([f"site:{d} {topic}" for d in domain_list])
     with DDGS() as ddgs:
         return [{
             "title": r.get("title", "Untitled"),
             "snippet": r.get("body", ""),
             "url": r.get("href", "")
-        } for r in ddgs.text(topic + " site:" + domains if domains else topic, max_results=5)]
+        } for r in ddgs.text(query, max_results=5)]
 
 def get_arxiv_papers(query):
     from urllib.parse import quote_plus