fm-ruff

This is a flymake backend for python. It's using ruff with json output to generate warnings asynchronously. Using the json output allows fm-ruff to mark the exact location of warnings.

Installation

fm-ruff is not yet available on melpa.

emacs 28

With emacs 28, clone the fm-ruff repository:

git clone https://github.com/schmir/fm-ruff

Call M-x package-install-file and choose the directory where you cloned the repository. Add the following to your init file:

(add-hook 'python-mode-hook #'fm-ruff-setup)

emacs 29

You can use package-vc-install to download and install the package automatically:

(unless (package-installed-p 'fm-ruff)
  (package-vc-install "https://github.com/schmir/fm-ruff"))

(use-package fm-ruff
  :hook (python-mode . fm-ruff-setup))

emacs 30

With emacs 30, add the following to your init file:

(use-package fm-ruff
  :vc (:fetcher github :repo schmir/fm-ruff)
  :hook (python-mode . fm-ruff-setup))