nixos/flake.nix

{
  description = "Flake to define configurations of 'elss' - ellmauthaler stefan's systems";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-22.11";
    nixpkgs-unstable.url = "github:NixOS/nixpkgs/nixos-unstable";

    #nix = {
    #      url = "github:NixOS/nix?ref=latest-release";
    #  url = "github:NixOS/nix";
    #  inputs.nixpkgs.follows = "nixpkgs";
    #};

    nixos-hardware = {
      url = "github:NixOS/nixos-hardware/master";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    home-manager = {
      url = "github:nix-community/home-manager/release-22.11";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    flake-utils-plus = {
      url = "github:gytis-ivaskevicius/flake-utils-plus";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    emacs-overlay = {
      url = "github:nix-community/emacs-overlay";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    simple-nixos-mailserver = {
      url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-22.05";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    sops-nix = {
      url = "github:Mic92/sops-nix/master";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    dwarffs = {
      url = "github:edolstra/dwarffs";
      inputs = {
        #nix.follows = "nix";
        nixpkgs.follows = "nixpkgs";
      };
    };

    comma = {
      url = "github:nix-community/comma";
      inputs = {
        nixpkgs.follows = "nixpkgs-unstable";
        utils.follows = "flake-utils-plus/flake-utils";
      };
    };
  };

  outputs = {
    self,
    nixpkgs,
    flake-utils-plus,
    ...
  } @ inputs: let
    extended-lib =
      nixpkgs.lib.extend
      (final: prev: {
        elss = (import ./lib {lib = final;}) prev;
      });
    inherit (extended-lib.elss) discoverModules moduleNames discoverMachines withModules discoverTemplates;
  in
    flake-utils-plus.lib.mkFlake rec {
      inherit self inputs;
      supportedSystems = ["x86_64-linux"];

      lib = extended-lib;

      channelsConfig = {
        allowUnfreePredicate = pkg:
          builtins.elem (extended-lib.getName pkg) [
            "slack"
            "steam"
            "steam-original"
            "steam-run"
            "steam-runtime"
            "skypeforlinux"
            "teams"
            "zoom"
          ];
      };

      channels.nixpkgs.overlaysBuilder = channels: [
        (final: prev: {
          unstable = channels.nixpkgs-unstable;
        })
        (flake-utils-plus.lib.genPkgOverlay inputs.comma "comma")
        #inputs.nix.overlay
        inputs.emacs-overlay.overlay
      ];

      hostDefaults = {
        system = "x86_64-linux";
        channelName = "nixpkgs";
        modules =
          [
            inputs.home-manager.nixosModules.home-manager
            inputs.sops-nix.nixosModules.sops
            inputs.dwarffs.nixosModules.dwarffs
            inputs.simple-nixos-mailserver.nixosModules.mailserver
            ./common/wireguard.nix
          ]
          ++ (map (name: ./modules + "/${name}") (moduleNames ./modules));
        specialArgs = {
          nixos-hardware = inputs.nixos-hardware.nixosModules;
          inherit inputs;
        };
        extraArgs = {
          homeConfigurations =
            withModules ./users
            (
              {
                name,
                path,
              }:
              #import (./users + "/${name}")
                import path
            );
        };
      };

      hosts =
        discoverMachines ./machines
        {
          specialArgs = {lib = extended-lib;};
        };

      nixosModules = discoverModules ./modules;

      homeConfigurations =
        withModules ./users
        (name: let
          username = extended-lib.removeSuffix ".nix" name;
        in
          inputs.home-manager.lib.homeManagerConfiguration {
            configuration = import (./users + "/${name}");
            inherit username;
            system = "x86_64-linux";
            homeDirectory = "/home/${username}";
            stateVersion = extended-lib.mkDefault "21.05";
          });

      outputsBuilder = channels: {
        devShells.default = import ./secrets/shell.nix {
          pkgs = channels.nixpkgs;
          sops-nix = inputs.sops-nix.packages."${channels.nixpkgs.system}";
        };
        formatter = channels.nixpkgs.alejandra;
      };

      templates = discoverTemplates ./templates {
        base = {
          description = "Basic setup of tools in nixpkgs/unstable";
          welcomeText = "Change into the folder and add the wanted packages to the buildInputs";
        };

        rust = {
          description = "Rust development environment flake";
          welcomeText = "Change into the folder and follow the prompt to create an automatic rust environment in this folder";
        };
        jupyter = {
          description = "Jupyter server flake";
          welcomeText = "Use `nix run .` to run a jupyter server instance.";
        };
      };
    };
}