nixos-config/flake.nix

{
  description = "Nixos configuration with flakes";
  inputs = {
    nixpkgs = {
      type = "github";
      owner = "NixOS";
      repo = "nixpkgs";
      ref = "nixos-unstable";
    };

    nixpkgs-unstable-small = {
      type = "github";
      owner = "NixOS";
      repo = "nixpkgs";
      ref = "nixos-unstable-small";
    };

    agenix = {
      type = "github";
      owner = "ryantm";
      repo = "agenix";
    };

    emacs-overlay = {
      type = "github";
      owner = "nix-community";
      repo = "emacs-overlay";
      ref = "master";
    };

    home-manager = {
      type = "github";
      owner = "nix-community";
      repo = "home-manager";
      ref = "master";
      inputs.nixpkgs.follows = "nixpkgs";
    };

    flake-utils = {
      type = "github";
      owner = "numtide";
      repo = "flake-utils";
      ref = "master";
    };

    nixos-hardware = {
      type = "github";
      owner = "NixOS";
      repo = "nixos-hardware";
      ref = "master";
    };
  };

  outputs = {
    self,
    nixpkgs,
    home-manager,
    agenix,
    ...
  } @ inputs:
    {
      nixosModules = {
        home = {
          home-manager.useGlobalPkgs = true;
          home-manager.useUserPackages = true;
          home-manager.users.alarsyo = import ./home;
          home-manager.verbose = true;
        };
        nix-path = {
          nix.nixPath = [
            "nixpkgs=${inputs.nixpkgs}"
          ];
        };
      };

      overlays = import ./overlays;

      nixosConfigurations = let
        system = "x86_64-linux";
        shared_overlays =
          [
            (self: super: {
              packages = import ./pkgs {pkgs = super;};

              # packages accessible through pkgs.unstable.package
              unstable = import inputs.nixpkgs-unstable-small {
                inherit system;
                config.allowUnfree = true;
              };
            })

            agenix.overlay
          ]
          ++ builtins.attrValues self.overlays;
        sharedModules =
          [
            agenix.nixosModule
            home-manager.nixosModule
            {nixpkgs.overlays = shared_overlays;}
          ]
          ++ (nixpkgs.lib.attrValues self.nixosModules);
      in {
        poseidon = nixpkgs.lib.nixosSystem rec {
          inherit system;
          modules =
            [
              ./poseidon.nix
            ]
            ++ sharedModules;
        };

        boreal = nixpkgs.lib.nixosSystem rec {
          inherit system;
          modules =
            [
              ./boreal.nix

              {
                nixpkgs.overlays = [
                  inputs.emacs-overlay.overlay

                  # uncomment this to build everything from scratch, fun but takes a
                  # while
                  #
                  # (self: super: {
                  #   stdenv = super.impureUseNativeOptimizations super.stdenv;
                  # })
                ];
              }
            ]
            ++ sharedModules;
        };

        zephyrus = nixpkgs.lib.nixosSystem rec {
          inherit system;
          modules =
            [
              ./zephyrus.nix

              inputs.nixos-hardware.nixosModules.common-cpu-intel
              inputs.nixos-hardware.nixosModules.common-pc-laptop
              inputs.nixos-hardware.nixosModules.common-pc-ssd

              {
                nixpkgs.overlays = [
                  inputs.emacs-overlay.overlay
                ];
              }
            ]
            ++ sharedModules;
        };
      };
    }
    // inputs.flake-utils.lib.eachDefaultSystem (system: {
      packages =
        (
          inputs.flake-utils.lib.flattenTree
          (import ./pkgs {pkgs = import nixpkgs {inherit system;};})
        )
        // {
          emacsPgtkGcc =
            (
              import nixpkgs {
                inherit system;
                overlays = [inputs.emacs-overlay.overlay];
              }
            )
            .emacsPgtkGcc;
        };
    });
}