flake-parts/setups/disko: init

Even though this is pretty useless in practice but whatever.

modules/flake-parts/setups/default.nix

@@ -1,5 +1,6 @@
 {
   imports = [
+    ./disko.nix
     ./nixos.nix
     ./nixvim.nix
     ./home-manager.nix

modules/flake-parts/setups/disko.nix

@@ -0,0 +1,46 @@
+# A declarative setup for Disko scripts... Yeah, why not. Seriously though,
+# this is only used to offer partitioning scripts for the rest of the system
+# outside of NixOS even though we can easily write dedicated shell scripts for
+# that. Take note we don't consider integrating this with declarative NixOS
+# setups since their Disko scripts are already gettable in
+# `config.system.build.diskoScript` along with its variants (e.g., `noDeps`).
+{ config, lib, ... }:
+
+let
+  cfg = config.setups.disko;
+
+  diskoConfigType = { name, config, ... }: {
+    options = {
+      configName = lib.mkOption {
+        type = lib.types.nonEmptyStr;
+        default = name;
+        example = "plover";
+        description = ''
+          The name of the configuration to be used. Useful for creating variants
+          of the same declarative environment.
+        '';
+      };
+    };
+  };
+in
+{
+  options.setups.disko = {
+    configs = lib.mkOption {
+      type = with lib.types; attrsOf (submodule diskoConfigType);
+      default = { };
+      example = {
+        archive = { };
+      };
+      description = ''
+        A set of declarative Disko configurations only used for integrating
+        with NixOS and itself by exporting into `diskoConfigurations` which is
+        recognized by `disko` program.
+      '';
+    };
+  };
+
+  config = {
+    flake.diskoConfigurations =
+      lib.mapAttrs (name: _: import ../../../configs/disko/${name}) cfg.configs;
+  };
+}