nix-conf/flake.nix

{
  description = "NixOS config";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    nixpkgs-stable.url = "github:NixOS/nixpkgs/nixos-24.05";
    home-manager = {
      url = "github:nix-community/home-manager";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    flake-programs-sqlite = {
      url = "github:wamserma/flake-programs-sqlite";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs = {
    nixpkgs,
    nixpkgs-stable,
    home-manager,
    flake-programs-sqlite,
    ...
  } @ inputs: let
    system = "x86_64-linux";
    pkgs = nixpkgs.legacyPackages.${system};
    pkgs-stable = nixpkgs-stable.legacyPackages.${system};
  in
    with builtins;
    with nixpkgs.lib.attrsets; {
      nixosConfigurations = mapAttrs' (host: _: {
        name = host;
        value = nixpkgs.lib.nixosSystem {
          inherit system;
          specialArgs = {
            inherit pkgs-stable;
            inherit flake-programs-sqlite;
          };
          modules = [(./hosts + "/${host}")];
        };
      }) (readDir ./hosts);
      homeConfigurations = foldl' (a: b: a // b) {} (map (
        host: let
          users = ./hosts + "/${host}/users";
        in
          if pathExists users
          then
            mapAttrs' (user: _: {
              name = "${user}@${host}";
              value = home-manager.lib.homeManagerConfiguration {
                inherit pkgs;
                extraSpecialArgs = {
                  inherit pkgs-stable;
                };
                modules = [(users + "/${user}")];
              };
            }) (readDir users)
          else {}
      ) (attrNames (readDir ./hosts)));
    };
}