diff --git a/aider/coders/__init__.py b/aider/coders/__init__.py
index 7f85a5622..58f5c3b6c 100644
--- a/aider/coders/__init__.py
+++ b/aider/coders/__init__.py
@@ -1,7 +1,15 @@
 from .base_coder import Coder
 from .editblock_coder import EditBlockCoder
 from .editblock_func_coder import EditBlockFunctionCoder
+from .single_wholefile_func_coder import SingleWholeFileFunctionCoder
 from .wholefile_coder import WholeFileCoder
 from .wholefile_func_coder import WholeFileFunctionCoder
 
-__all__ = [Coder, EditBlockCoder, WholeFileCoder, WholeFileFunctionCoder, EditBlockFunctionCoder]
+__all__ = [
+    Coder,
+    EditBlockCoder,
+    WholeFileCoder,
+    WholeFileFunctionCoder,
+    EditBlockFunctionCoder,
+    SingleWholeFileFunctionCoder,
+]
diff --git a/aider/coders/base_coder.py b/aider/coders/base_coder.py
index e5f87ae2a..a9489e2fd 100755
--- a/aider/coders/base_coder.py
+++ b/aider/coders/base_coder.py
@@ -59,6 +59,7 @@ class Coder:
         from . import (
             EditBlockCoder,
             EditBlockFunctionCoder,
+            SingleWholeFileFunctionCoder,
             WholeFileCoder,
             WholeFileFunctionCoder,
         )
@@ -87,6 +88,8 @@ class Coder:
             return WholeFileCoder(main_model, io, **kwargs)
         elif edit_format == "whole-func":
             return WholeFileFunctionCoder(main_model, io, **kwargs)
+        elif edit_format == "single-whole-func":
+            return SingleWholeFileFunctionCoder(main_model, io, **kwargs)
         elif edit_format == "diff-func":
             return EditBlockFunctionCoder("list", main_model, io, **kwargs)
         elif edit_format == "diff-func-string":
diff --git a/aider/coders/single_wholefile_func_coder.py b/aider/coders/single_wholefile_func_coder.py
new file mode 100644
index 000000000..b6368311a
--- /dev/null
+++ b/aider/coders/single_wholefile_func_coder.py
@@ -0,0 +1,119 @@
+import os
+
+from aider import diffs
+
+from ..dump import dump  # noqa: F401
+from .base_coder import Coder
+from .single_wholefile_func_prompts import SingleWholeFileFunctionPrompts
+
+
+class SingleWholeFileFunctionCoder(Coder):
+    functions = [
+        dict(
+            name="write_file",
+            description="write new content into the file",
+            parameters=dict(
+                type="object",
+                required=["explanation", "content"],
+                properties=dict(
+                    explanation=dict(
+                        type="string",
+                        description=(
+                            "Step by step plan for the changes to be made to the code (future"
+                            " tense, markdown format)"
+                        ),
+                    ),
+                    content=dict(
+                        type="string",
+                        description="Content to write to the file",
+                    ),
+                ),
+            ),
+        ),
+    ]
+
+    def __init__(self, *args, **kwargs):
+        self.gpt_prompts = SingleWholeFileFunctionPrompts()
+        super().__init__(*args, **kwargs)
+
+    def update_cur_messages(self, content, edited):
+        if edited:
+            self.cur_messages += [
+                dict(role="assistant", content=self.gpt_prompts.redacted_edit_message)
+            ]
+        else:
+            self.cur_messages += [dict(role="assistant", content=content)]
+
+    def get_context_from_history(self, history):
+        context = ""
+        if history:
+            context += "# Context:\n"
+            for msg in history:
+                if msg["role"] == "user":
+                    context += msg["role"].upper() + ": " + msg["content"] + "\n"
+        return context
+
+    def render_incremental_response(self, final=False):
+        if self.partial_response_content:
+            return self.partial_response_content
+
+        args = self.parse_partial_args()
+
+        return str(args)
+
+        if not args:
+            return
+
+        explanation = args.get("explanation")
+        files = args.get("files", [])
+
+        res = ""
+        if explanation:
+            res += f"{explanation}\n\n"
+
+        for i, file_upd in enumerate(files):
+            path = file_upd.get("path")
+            if not path:
+                continue
+            content = file_upd.get("content")
+            if not content:
+                continue
+
+            this_final = (i < len(files) - 1) or final
+            res += self.live_diffs(path, content, this_final)
+
+        return res
+
+    def live_diffs(self, fname, content, final):
+        lines = content.splitlines(keepends=True)
+
+        # ending an existing block
+        full_path = os.path.abspath(os.path.join(self.root, fname))
+
+        with open(full_path, "r") as f:
+            orig_lines = f.readlines()
+
+        show_diff = diffs.diff_partial_update(
+            orig_lines,
+            lines,
+            final,
+            fname=fname,
+        ).splitlines()
+
+        return "\n".join(show_diff)
+
+    def update_files(self):
+        name = self.partial_response_function_call.get("name")
+        if name and name != "write_file":
+            raise ValueError(f'Unknown function_call name="{name}", use name="write_file"')
+
+        args = self.parse_partial_args()
+        if not args:
+            return
+
+        content = args["content"]
+        path = self.get_inchat_relative_files()[0]
+        if self.allowed_to_edit(path, content):
+            return set([path])
+
+        return set()
diff --git a/aider/coders/single_wholefile_func_prompts.py b/aider/coders/single_wholefile_func_prompts.py
new file mode 100644
index 000000000..f97a91be9
--- /dev/null
+++ b/aider/coders/single_wholefile_func_prompts.py
@@ -0,0 +1,27 @@
+# flake8: noqa: E501
+
+from .base_prompts import CoderPrompts
+
+
+class SingleWholeFileFunctionPrompts(CoderPrompts):
+    main_system = """Act as an expert software developer.
+Take requests for changes to the supplied code.
+If the request is ambiguous, ask questions.
+
+Once you understand the request you MUST use the `write_file` function to update the file to make the changes.
+"""
+
+    system_reminder = """
+ONLY return code using the `write_file` function.
+NEVER return code outside the `write_file` function.
+"""
+
+    files_content_prefix = "Here is the current content of the file:\n"
+    files_no_full_files = "I am not sharing any files yet."
+
+    redacted_edit_message = "No changes are needed."
+
+    # TODO: should this be present for using this with gpt-4?
+    repo_content_prefix = None
+
+    # TODO: fix the chat history, except we can't keep the whole file