Handle missing filename when only 1 in session

aider/coders/wholefile_coder.py

@@ -2,6 +2,7 @@ from pathlib import Path
 
 from aider import diffs
 
+from ..dump import dump  # noqa: F401
 from .base_coder import Coder
 from .wholefile_prompts import WholeFilePrompts
 
@@ -34,8 +35,9 @@ class WholeFileCoder(Coder):
         fname = None
         new_lines = []
         for i, line in enumerate(lines):
+            dump(repr(fname), repr(line), repr(new_lines))
             if line.startswith("```"):
-                if fname:
+                if fname is not None:
                     # ending an existing block
                     full_path = (Path(self.root) / fname).absolute()
 
@@ -59,22 +61,23 @@ class WholeFileCoder(Coder):
                     new_lines = []
                     continue
 
-                # starting a new block
-                if i == 0:
+                # fname==None ... starting a new block
+                if i > 0:
+                    fname = lines[i - 1].strip()
+                if not fname:  # blank line? or ``` was on first line i==0
                     if len(chat_files) == 1:
                         fname = chat_files[0]
                     else:
                         # TODO: sense which file it is by diff size
                         raise ValueError("No filename provided before ``` block")
-                else:
-                    fname = lines[i - 1].strip()
-            elif fname:
+
+            elif fname is not None:
                 new_lines.append(line)
             else:
                 output.append(line)
 
         if mode == "diff":
-            if fname:
+            if fname is not None:
                 # ending an existing block
                 full_path = (Path(self.root) / fname).absolute()
 
@@ -89,10 +92,12 @@ class WholeFileCoder(Coder):
 
             return "\n".join(output)
 
-        if fname and self.allowed_to_edit(fname):
-            edited.add(fname)
-            if not self.dry_run:
-                new_lines = "".join(new_lines)
-                Path(full_path).write_text(new_lines)
+        if fname:
+            full_path = self.allowed_to_edit(fname)
+            if full_path:
+                edited.add(fname)
+                if not self.dry_run:
+                    new_lines = "".join(new_lines)
+                    Path(full_path).write_text(new_lines)
 
         return edited

tests/test_wholefile.py

@@ -68,6 +68,42 @@ class TestWholeFileCoder(unittest.TestCase):
                 updated_content = f.read()
             self.assertEqual(updated_content, "Updated content\n")
 
+    def test_update_files_earlier_filename(self):
+        with tempfile.TemporaryDirectory() as temp_dir:
+            os.chdir(temp_dir)
+
+            sample_file = "accumulate.py"
+            content = (
+                "def accumulate(collection, operation):\n    return [operation(x) for x in"
+                " collection]\n"
+            )
+
+            with open(sample_file, "w") as f:
+                f.write("Original content\n")
+
+            # Initialize WholeFileCoder with the temporary directory
+            io = InputOutput(yes=True)
+            coder = WholeFileCoder(main_model=models.GPT35, io=io, fnames=[sample_file])
+
+            # Set the partial response content with the updated content
+            coder.partial_response_content = (
+                f"Here's the modified `{sample_file}` file that implements the `accumulate`"
+                f" function as per the given instructions:\n\n```\n{content}```\n\nThis"
+                " implementation uses a list comprehension to apply the `operation` function to"
+                " each element of the `collection` and returns the resulting list."
+            )
+
+            # Call update_files method
+            edited_files = coder.update_files()
+
+            # Check if the sample file was updated
+            self.assertIn(sample_file, edited_files)
+
+            # Check if the content of the sample file was updated
+            with open(sample_file, "r") as f:
+                updated_content = f.read()
+            self.assertEqual(updated_content, content)
+
 
 if __name__ == "__main__":
     unittest.main()