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nixpkgs-fmt.el
This Emacs library provides commands and a minor mode for easily reformatting Nix source code using the nixpkgs-fmt command.
Installation
If you choose not to use one of the convenient
packages in MELPA, you'll need to
add the directory containing nixpkgs-fmt.el to your load-path, and
then (require 'nixpkgs-fmt).
Usage
Customise the nixpkgs-fmt-command variable as desired, then call
nixpkgs-fmt-buffer or nixpkgs-fmt-region as convenient.
Enable nixpkgs-fmt-on-save-mode in Nix buffers like this:
(add-hook 'nix-mode-hook 'nixpkgs-fmt-on-save-mode)
or locally to your project with a form in your .dir-locals.el like this:
((nix-mode
(mode . nixpkgs-fmt-on-save)))
You might like to bind nixpkgs-fmt or nixpkgs-fmt-buffer to a key,
e.g. with:
(define-key 'nix-mode-map (kbd "C-c C-f") 'nixpkgs-fmt)