feat: add nix flake

.gitignore

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+.envrc
+.direnv
+.vscode
+result

default.nix

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+{ stdenvNoCC, lib, theme }:
+let
+  themes = builtins.map (theme: (builtins.head (lib.strings.splitString "." theme))) (builtins.attrNames (builtins.readDir ./assets/backgrounds));
+in
+assert builtins.any (x: x == theme) themes;
+
+stdenvNoCC.mkDerivation {
+  name = "distro-grub-themes";
+  src = ./.;
+
+  installPhase = ''
+    mkdir -p $out
+    cp ./assets/backgrounds/${theme}.png $out/background.png
+    cp ./assets/splash_image.jpg $out/splash_image.jpg
+    cp -r ./assets/icons $out
+    cp -r ./assets/fonts/. $out
+    cp -r ./assets/menu/. $out
+    cp -r ./assets/theme.txt $out
+  '';
+
+  meta = with lib; {
+    homepage = "https://github.com/AdisonCavani/distro-grub-themes";
+    description = "A pack of GRUB2 themes for each Linux distribution";
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ zakuciael ];
+    platforms = platforms.linux;
+  };
+}

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1710146030,
+        "narHash": "sha256-SZ5L6eA7HJ/nmkzGG7/ISclqe6oZdOZTNoesiInkXPQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "b1d9ab70662946ef0850d488da1c9019f3a9752a",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1712963716,
+        "narHash": "sha256-WKm9CvgCldeIVvRz87iOMi8CFVB1apJlkUT4GGvA0iM=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "cfd6b5fc90b15709b780a5a1619695a88505a176",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "A pack of GRUB2 themes for each Linux distribution";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs =
+    { self, nixpkgs, flake-utils }:
+    let
+      systems = [ "aarch64-linux" "i686-linux" "x86_64-linux" ];
+    in
+    flake-utils.lib.eachSystem systems (
+      system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        themeNames = builtins.attrNames (builtins.readDir ./assets/backgrounds);
+        themePackages = builtins.listToAttrs (builtins.map
+          (theme:
+            let name = (builtins.head (pkgs.lib.strings.splitString "." theme)); in {
+              name = name + "-grub-theme";
+              value = pkgs.callPackage ./default.nix { theme = name; };
+            })
+          themeNames);
+      in
+      {
+        packages = {
+          default = pkgs.callPackage ./default.nix { theme = "nixos"; };
+        } // themePackages;
+
+        devShells.default = pkgs.mkShell {
+          nativeBuildInputs = with pkgs; [ nixd nixpkgs-fmt act jq ];
+        };
+
+        nixosModules.default = ./module.nix;
+      }
+    );
+}
+ 

module.nix

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+{ pks, lib, config, ... }:
+with lib;
+let
+  cfg = config.distro-grub-themes;
+  themes = builtins.map (theme: (builtins.head (lib.strings.splitString "." theme))) (builtins.attrNames (builtins.readDir ./assets/backgrounds));
+in
+{
+  options.distro-grub-themes = {
+    enable = mkEnableOption "Enable Distro Grub Theme";
+    theme = mkOption {
+      type = types.enum themes;
+      default = "nixos";
+      example = "arch-linux";
+      description = ''
+        Selected theme name.
+        IMPORTANT! Theme name must be the same as in assert/backgrounds directory without the extension
+      '';
+    };
+  };
+
+  config = mkIf (cfg.enable)
+    {
+      boot.loader.grub = {
+        theme = pkgs.callPackage ./default.nix { theme = cfg.theme; };
+        splashImage = ./assets/splash_image.jpg;
+      };
+    };
+}