# Context:
USER: do the todo
ASSISTANT: To complete the TODO task in the `diff_partial_update` function, I will find the longest string of backticks (`) that start a line in the `diff` variable. I will then add one more backtick to the start and end of the `show` variable to ensure proper formatting.
Here are the changes:
```python
aider/diffs.py
<<<<<<< ORIGINAL
for line in diff:
pass
diff = "".join(diff)
if not diff.endswith("\n"):
diff += "\n"
show = "```diff\n"
=======
max_backticks = max(len(line) - len(line.lstrip("`")) for line in diff.splitlines())
extra_backticks = "`" * (max_backticks + 1)
diff = "".join(diff)
if not diff.endswith("\n"):
diff += "\n"
show = f"{extra_backticks}diff\n"
>>>>>>> UPDATED
```
```python
aider/diffs.py
<<<<<<< ORIGINAL
show += diff + "```\n\n"
=======
show += diff + f"{extra_backticks}\n\n"
>>>>>>> UPDATED
```
These changes will find the longest string of backticks at the start of a line in the `diff` variable and add one more backtick to the start and end of the `show` variable.
# Context:
USER: expand the context diff to 5 lines of context
ASSISTANT: To expand the context diff to 5 lines of context, you need to modify the `diff_partial_update` function in the `aider/diffs.py` file. Update the `unified_diff` function call to include the `n` parameter with a value of 5.
Here's the change:
```python
aider/diffs.py
<<<<<<< ORIGINAL
diff = difflib.unified_diff(lines_orig, lines_updated)
=======
diff = difflib.unified_diff(lines_orig, lines_updated, n=5)
>>>>>>> UPDATED
```
# Context:
USER: read 2 files named on the cmd line, use difflib to print their differences
ASSISTANT: To achieve this, we'll create a new Python script that reads two file names from the command line, reads the contents of the files, and then uses the `difflib` module to print their differences.
1. Create a new Python script called `diff_files.py` in the `aider` directory.
2. Import the necessary modules: `sys` and `difflib`.
3. Read the file names from the command line arguments.
4. Read the contents of the files.
5. Use `difflib.unified_diff()` to generate the differences.
6. Print the differences.
Here's the code for the new `diff_files.py` script:
```python
aider/diff_files
^C KeyboardInterrupt
USER: put it in `aider/diffs.py`
