# Context:
USER: make the two history files optional
ASSISTANT: To make the two history files optional, we will modify the `__init__` method of the `InputOutput` class in the `aider/io.py` file. We will set the default values of `input_history_file` and `chat_history_file` to `None`. Then, we will add conditions to check if these variables are not `None` before using them.
```python
aider/io.py
<<<<<<< ORIGINAL
def __init__(self, pretty, yes, input_history_file, chat_history_file, input=None, output=None):
=======
def __init__(self, pretty, yes, input_history_file=None, chat_history_file=None, input=None, output=None):
>>>>>>> UPDATED
```
```python
aider/io.py
<<<<<<< ORIGINAL
session = PromptSession(
message=show,
completer=completer_instance,
history=FileHistory(self.input_history_file),
style=style,
reserve_space_for_menu=4,
complete_style=CompleteStyle.MULTI_COLUMN,
input=self.input,
output=self.output,
)
=======
session_kwargs = {
"message": show,
"completer": completer_instance,
"style": style,
"reserve_space_for_menu": 4,
"complete_style": CompleteStyle.MULTI_COLUMN,
"input": self.input,
"output": self.output,
}
if self.input_history_file is not None:
session_kwargs["history"] = FileHistory(self.input_history_file)
session = PromptSession(**session_kwargs)
>>>>>>> UPDATED
```
```python
aider/io.py
<<<<<<< ORIGINAL
self.chat_history_file = Path(chat_history_file)
=======
if chat_history_file is not None:
self.chat_history_file = Path(chat_history_file)
else:
self.chat_history_file = None
>>>>>>> UPDATED
```
```python
aider/io.py
<<<<<<< ORIGINAL
with self.chat_history_file.open("a") as f:
f.write(text)
=======
if self.chat_history_file is not None:
with self.chat_history_file.open("a") as f:
f.write(text)
>>>>>>> UPDATED
```
These changes will make the history files optional.
# Context:
USER: aider/io.py:12:1: F401 'time' imported but unused
import time
^
aider/io.py:13:1: F401 'random' imported but unused
import random
^
ASSISTANT: I see that there are unused imports in the `aider/io.py` file. I will remove them.
```python
aider/io.py
<<<<<<< ORIGINAL
import time
import random
=======
>>>>>>> UPDATED
```
