Handle missing filenames by scanning for mentions in the text

tests/test_wholefile.py

@@ -1,6 +1,7 @@
 import os
 import tempfile
 import unittest
+from pathlib import Path
 
 from aider import models
 from aider.coders.wholefile_coder import WholeFileCoder
@@ -68,7 +69,7 @@ class TestWholeFileCoder(unittest.TestCase):
                 updated_content = f.read()
             self.assertEqual(updated_content, "Updated content\n")
 
-    def test_update_files_earlier_filename(self):
+    def test_update_files_no_filename_single_file_in_chat(self):
         with tempfile.TemporaryDirectory() as temp_dir:
             os.chdir(temp_dir)
 
@@ -104,6 +105,47 @@ class TestWholeFileCoder(unittest.TestCase):
                 updated_content = f.read()
             self.assertEqual(updated_content, content)
 
+    def test_update_files_earlier_filename(self):
+        with tempfile.TemporaryDirectory() as temp_dir:
+            os.chdir(temp_dir)
+            print(temp_dir)
+
+            fname_a = Path("a.txt")
+            fname_b = Path("b.txt")
+
+            fname_a.write_text("before a\n")
+            fname_b.write_text("before b\n")
+
+            response = """
+Here is a new version of `a.txt` for you to consider:
+
+```
+after a
+```
+
+And here is `b.txt`:
+
+```
+after b
+```
+"""
+            # Initialize WholeFileCoder with the temporary directory
+            io = InputOutput(yes=True)
+            coder = WholeFileCoder(main_model=models.GPT35, io=io, fnames=[fname_a, fname_b])
+
+            # Set the partial response content with the updated content
+            coder.partial_response_content = response
+
+            # Call update_files method
+            edited_files = coder.update_files()
+
+            # Check if the sample file was updated
+            self.assertIn(str(fname_a), edited_files)
+            self.assertIn(str(fname_b), edited_files)
+
+            self.assertEqual(fname_a.read_text(), "after a\n")
+            self.assertEqual(fname_b.read_text(), "after b\n")
+
 
 if __name__ == "__main__":
     unittest.main()