nixos/templates/basic_tools/flake.nix

{
  description = "basic tool setup flake";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.05";
    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";
    flake-utils.url = "github:numtide/flake-utils";
    flake-utils-plus.url = "github:gytis-ivaskevicius/flake-utils-plus";
  };

  outputs = { self, nixpkgs, nixpkgs-unstable, flake-utils, flake-utils-plus, ... }@inputs:
    { } // (flake-utils.lib.eachDefaultSystem (system:
      let
        unstable = import nixpkgs-unstable {
          inherit system;
        };
        pkgs = import nixpkgs {
          inherit system;
        };
      in
        rec {
          devShell =
            pkgs.mkShell {
              buildInputs = [
                # add packages here, like
                # pkgs.clingo
              ];
            };
        }
    ));
}