forgot the chainlit changes

app.py

@@ -1,7 +1,7 @@
 import os
 from typing import List
 from chainlit.types import AskFileResponse
-from aimakerspace.text_utils import CharacterTextSplitter, TextFileLoader
+from aimakerspace.text_utils import CharacterTextSplitter, TextFileLoader, PDFLoader, SentenceTextSplitter
 from aimakerspace.openai_utils.prompts import (
     UserRolePrompt,
     SystemRolePrompt,
@@ -47,8 +47,21 @@ class RetrievalAugmentedQAPipeline:
 
         return {"response": generate_response(), "context": context_list}
 
-text_splitter = CharacterTextSplitter()
+text_splitter = SentenceTextSplitter()
 
+def process_pdf_file(file: AskFileResponse):
+    import tempfile
+
+    with tempfile.NamedTemporaryFile(mode="w", delete=False, suffix=".pdf") as temp_file:
+        temp_file_path = temp_file.name
+
+    with open(temp_file_path, "wb") as f:
+        f.write(file.content)
+
+    pdf_loader = PDFLoader(temp_file_path)
+    documents = pdf_loader.load_documents()
+    texts = text_splitter.split_texts(documents)
+    return texts
 
 def process_text_file(file: AskFileResponse):
     import tempfile
@@ -72,7 +85,7 @@ async def on_chat_start():
     # Wait for the user to upload a file
     while files == None:
         files = await cl.AskFileMessage(
-            content="Please upload a Text File file to begin!",
+            content="Please upload a PDF File file to begin!",
             accept=["text/plain"],
             max_size_mb=2,
             timeout=180,
@@ -86,7 +99,7 @@ async def on_chat_start():
     await msg.send()
 
     # load the file
-    texts = process_text_file(file)
+    texts = process_pdf_file(file)
 
     print(f"Processing {len(texts)} text chunks")