pedantix is the pedantic Nix formatter.
It was bothering me that in my NixOS configuration, I was never consistent in ordering my module arguments, some being { lib, config, pkgs, ... } and some others being { config, lib, pkgs, ... }, you get the idea. Also I had grown tired of statix' repeated_keys error. Lastly, due to the nature of the nix language, I do not think there is much value in custom ordering of attributes except for in let bindings (I guess you could make a case for rec as well).
pedantix does this for you while staying compliant with your formatter of choice (tested with nixfmt(-rs), alejandra, and nixpkgs-fmt). I guess you can consider it a cherry on top :)
Here are some of its features (everything is optional):
- ordering of function arguments
- ordering of attributes
- ordering of inherits
- ordering of let bindings
- ordering of lists (use with caution!)
- merging of repeated keys (this does not fix broken evaluations)
- flattening of attribute sets with a single entry
- (un-)quoting of (valid) identifiers
- enforcing of blank lines in between attribute sets
- overrides for arbitrary attribute paths
(this will not modify your file, but only show you how it would look when formatted with pedantix)
nix run github:Swarsel/pedantix < your-file.nix