{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
    utils.url = "github:numtide/flake-utils";

    # nix lsp
    nil.url = "github:oxalica/nil";
  };

  outputs = input @ { self, nixpkgs, utils, ... }:
    utils.lib.eachDefaultSystem (system:
      let
        pkgs = import nixpkgs { inherit system; };

        neovim = pkgs.callPackage ./. { };
        nil = input.nil.packages.${system}.nil;
      in
      {
        devShells.default = pkgs.mkShell {
          packages = [ neovim nil ];
        };
      });
}