format-nix
A simple formatter for Nix using tree-sitter-nix.
Submit bugs by adding PRs for files that fail and adding the input to tests.
Development setup
Get PureScript and Pulp.
# never use 'sudo' with npm.
> npm set prefix ~/.npm
> npm install
> npm run mkbin
> npm link
# update requires mkbin run again
> npm run mkbin
Usage
> format-nix test/build.nix
formatted test/build.nix.
See the example output from the tests here: test/output.nix
Example use from Emacs
Try putting this in your init.el or wherever:
(defun run-format-nix ()
"run format-nix"
(interactive)
(let* ((command (format "cd %s && format-nix %s" (projectile-project-root) buffer-file-name))
(results "*FORMAT-NIX STDOUT*")
(errors "*FORMAT-NIX ERRORS*"))
(shell-command command results errors)
(if (get-buffer errors)
(progn
(with-current-buffer errors
(message (string-trim (buffer-string))))
(kill-buffer errors))
(progn
(with-current-buffer results
(message (string-trim (buffer-string))))
(kill-buffer results)
;; note this just reverts the buffer so save your files first.
(revert-buffer t t t)))))
;; if you use evil mode, otherwise add your own bindings
(general-define-key
:keymaps 'normal
"SPC m p n" 'run-format-nix)
