flake.nix

{
  inputs = {
    nixpkgs.url = "github:rhelmot/nixpkgs/freebsd-staging-test";
    lix = {
      url = "git+https://git.lix.systems/artemist/lix.git?ref=freebsd-build";
      inputs.nixpkgs.follows = "nixpkgs";
      # We don't need another nixpkgs clone, it won't evaluate anyway
      inputs.nixpkgs-regression.follows = "nixpkgs";
    };
    mini-tmpfiles = {
      url = "github:nixos-bsd/mini-tmpfiles";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  nixConfig = {
    extra-substituters = [ "https://attic.mildlyfunctional.gay/nixbsd" ];
    extra-trusted-public-keys =
      [ "nixbsd:gwcQlsUONBLrrGCOdEboIAeFq9eLaDqfhfXmHZs1mgc=" ];
  };

  outputs = { self, nixpkgs, lix, mini-tmpfiles }:
    let
      inherit (nixpkgs) lib;

      makePkgs = system: import nixpkgs { inherit system; };
      forAllSystems = lib.genAttrs lib.systems.flakeExposed;

      configBase = ./configurations;
      makeSystem = name: module:
        self.lib.nixbsdSystem {
          modules = [ module { networking.hostName = "nixbsd-${name}"; } ];
        };

      makeImage = buildPlatform: conf:
        let
          extended = conf.extendModules {
            modules = [{ config.nixpkgs.buildPlatform = buildPlatform; }];
          };
        in extended.config.system.build // {
          # appease `nix flake show`
          type = "derivation";
          name = "system-build";

          closureInfo = extended.pkgs.closureInfo {
            rootPaths = [ extended.config.system.build.toplevel.drvPath ];
          };
          vmClosureInfo = extended.pkgs.closureInfo {
            rootPaths = [ extended.config.system.build.vm.drvPath ];
          };
          inherit (extended) pkgs;
        };
    in {
      lib.nixbsdSystem = args:
        import ./lib/eval-config.nix (args // {
          inherit (nixpkgs) lib;
          nixpkgsPath = nixpkgs.outPath;
          specialArgs = {
            lixFlake = lix;
            mini-tmpfiles-flake = mini-tmpfiles;
          } // (args.specialArgs or { });
        } // lib.optionalAttrs (!args ? system) { system = null; });

      nixosConfigurations =
        lib.mapAttrs (name: _: makeSystem name (configBase + "/${name}"))
        (builtins.readDir configBase);

      packages = forAllSystems (system:
        lib.mapAttrs (name: makeImage system) self.nixosConfigurations);

      formatter = forAllSystems (system: (makePkgs system).nixfmt-classic);

      hydraJobs = lib.mapAttrs (system: lib.mapAttrs (configuration: attrs: {inherit (attrs) vm systemImage;})) self.packages;
    };
}