Using ruff in pipes (formatting stdin and writing to stdout)?

[marinegor]

Hi everyone,

short question: how to make something like this work:

$ cat foo.py

f = lambda x:x+3
f(int(input())

$ cat foo.py | ruff
f = lambda x : x + 3
f(int(input())

Reasoning behind it that I am developing in a large codebase that doesn't have a formatter configured by default, but still enjoy using one. So I run black on the pieces of the code that I add, and in Neovim it's done via selecting a piece of code and running :'<,'>!black - 2>/dev/null, which formats the code under selection.

I wonder now, if there's an option to replicate that with ruff? I've tried working with ruff format --stdin-filename, but no luck just yet.

[charliermarsh]

Are you looking for something like:

❯ cat foo.py | ruff format -
import os

sys

[marinegor]

ah ok indeed, that one's even simpler. Thanks!

(btw, insanely cool to see a reply appearing faster that I'm typing my own solution)

[pelson]

Just added #20460, as I don't believe it is possible to pipe ruff check --fix through stdout currently.

[marinegor]

Ok literally I posted it, I got the solution that works for selection buffer:

!ruff format --stdin-filename % -

this would apply ruff format to the selected block of code, which is exactly what I need