{
  inputs = {
    srvos.url = "github:nix-community/srvos";
    nixpkgs.follows = "srvos/nixpkgs";
    nixos-hardware.url = "github:NixOS/nixos-hardware";
    nix-index-database.url = "github:Mic92/nix-index-database";
    nix-index-database.inputs.nixpkgs.follows = "nixpkgs";
    nur = {
      url = "github:nix-community/nur";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    darwin.url = "github:lnl7/nix-darwin/master";
    darwin.inputs.nixpkgs.follows = "nixpkgs";
    home-manager.url = "github:nix-community/home-manager";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";
    utils.url = "github:numtide/flake-utils";
    angrr.url = "github:linyinfeng/angrr";
    angrr.inputs.nixpkgs.follows = "nixpkgs";
    agenix.url = "github:ryantm/agenix";
    agenix.inputs.nixpkgs.follows = "nixpkgs";
    mycal.url = "git+https://git.alin.ovh/mycal";
    elgit.url = "git+https://git.alin.ovh/elgit";
    searchix.url = "git+https://git.alin.ovh/searchix";
    nixvim = {
      url = "github:nix-community/nixvim";
      inputs.nixpkgs.follows = "nixpkgs";
    };
    golink = {
      url = "github:tailscale/golink";
      inputs.nixpkgs.follows = "nixpkgs";
    };
  };

  outputs =
    inputs:
    with inputs;
    let
      readOverlays =
        path:
        let
          content = builtins.readDir path;
        in
        map (n: import (path + ("/" + n))) (
          builtins.filter (
            n:
            (
              builtins.match ".*\\.nix" n != null
              &&
                # ignore Emacs lock files (.#foo.nix)
                builtins.match "\\.#.*" n == null
            )
            || builtins.pathExists (path + ("/" + n + "/default.nix"))
          ) (builtins.attrNames content)
        );

      mkHomeConfiguration =
        { modules, system }:
        home-manager.lib.homeManagerConfiguration {
          pkgs = import nixpkgs {
            inherit system;
            overlays = readOverlays (toString ./overlays) ++ [
              agenix.overlays.default
              angrr.overlays.default
              (self: super: {
                personal = import ./packages/overlay.nix self super;
              })
            ];
          };

          inherit modules;
          extraSpecialArgs = {
            inherit inputs system;
          };
        };
    in
    {
      nixosConfigurations.prefect = nixpkgs.lib.nixosSystem {
        system = utils.lib.system.x86_64-linux;
        specialArgs = { inherit inputs; };
        modules =
          [
            ./system/prefect.nix
          ]
          ++ (with nixos-hardware.nixosModules; [
            common-cpu-amd
            common-cpu-amd-pstate
            common-pc-ssd
            common-pc
            common-gpu-nvidia-nonprime
          ]);
      };
      nixosConfigurations.nano = nixpkgs.lib.nixosSystem {
        system = utils.lib.system.aarch64-linux;
        specialArgs = { inherit inputs; };
        modules = [
          agenix.nixosModules.default
          srvos.nixosModules.server
          srvos.nixosModules.mixins-systemd-boot
          ./system/nano.nix
          ./system/nano-hardware.nix
        ];
      };
      nixosConfigurations.linde =
        let
          system = utils.lib.system.aarch64-linux;
        in
        nixpkgs.lib.nixosSystem {
          inherit system;
          specialArgs = { inherit inputs; };
          modules = [
            {
              nixpkgs.overlays = (readOverlays ./overlays) ++ [
                nur.overlays.default
                elgit.overlays.default
                (final: prev: {
                  searchix = searchix.packages.${system}.default;
                })
              ];
            }
            srvos.nixosModules.server
            srvos.nixosModules.hardware-hetzner-cloud-arm
            agenix.nixosModules.default
            elgit.nixosModules.elgit
            mycal.nixosModules.mycal
            searchix.nixosModules.web
            golink.nixosModules.default
            ./packages/modules/nixos/laminar.nix
            ./system/linde.nix
            ./private/calendar.nix
          ];
        };
      darwinConfigurations.marvin = darwin.lib.darwinSystem {
        system = utils.lib.system.aarch64-darwin;
        specialArgs = { inherit inputs; };
        modules = [
          {
            nixpkgs.overlays = [
              angrr.overlays.default
            ];
          }
          srvos.darwinModules.desktop
          angrr.darwinModules.angrr
          ./system/marvin.nix
          ./packages/modules/darwin/caddy
        ];
      };
      homeConfigurations."alan@marvin" = mkHomeConfiguration {
        system = utils.lib.system.aarch64-darwin;
        modules = [
          ./user/marvin.nix
          ./private/tabnine.nix
          ./private/ssh.nix
          nix-index-database.hmModules.nix-index
          nixvim.homeModules.nixvim
        ];
      };
      homeConfigurations."alan@prefect" = mkHomeConfiguration {
        system = utils.lib.system.x86_64-linux;
        modules = [
          ./user/prefect.nix
          ./private/tabnine.nix
          ./private/ssh.nix
          nix-index-database.hmModules.nix-index
        ];
      };
      homeConfigurations."alan@nano" = mkHomeConfiguration {
        system = utils.lib.system.aarch64-linux;
        modules = [
          ./user/nano.nix
          nix-index-database.hmModules.nix-index
        ];
      };
      homeConfigurations."alan@linde" = mkHomeConfiguration {
        system = utils.lib.system.aarch64-linux;
        modules = [
          ./user/server.nix
          nix-index-database.hmModules.nix-index
          nixvim.homeModules.nixvim
        ];
      };
    }
    // utils.lib.eachDefaultSystem (
      system:
      let
        pkgs = import nixpkgs { inherit system; };
      in
      {
        devShells = {
          default = pkgs.mkShell {
            packages = with pkgs; [
              nixos-rebuild
              agenix.packages.${system}.default
            ];
          };
        };
        formatter = pkgs.nixfmt-tree;
      }
    );
}