Not all languages have code formatters, but if they exist, we like to
add them. You'll need to update the install recipe in your
language's configuration to install the code formatter as well. Then
add a format.run key with a shell command that will read a program
on stdin and write the formatted version to stdout.
You'll also want to add a format.input key which is equivalent to
the template code, but formatted incorrectly. This can be used to
verify that the formatter is working as expected.
Here's an example:
install:
apt:
- black
template: |
print("Hello, world!")
format:
run: |
black -
input: |
print('Hello, world!')