nix: add elegant grub2 theme package

nixos/nix.nix

@@ -113,6 +113,7 @@
           codex = inputs.codex-cli-nix.packages.${prev.stdenv.hostPlatform.system}.default;
           claude-code = inputs.claude-code-nix.packages.${prev.stdenv.hostPlatform.system}.default;
           git-sync-rs = inputs.git-sync-rs.packages.${prev.stdenv.hostPlatform.system}.default;
+          elegant-grub2-theme = final.callPackage ./packages/elegant-grub2-theme {};
           kef = final.callPackage ./packages/kef {};
           pykefcontrol = final.python3Packages.callPackage ./packages/pykefcontrol {};
           roborock-control = final.callPackage ./packages/roborock-control {};

nixos/packages/elegant-grub2-theme/default.nix

@@ -0,0 +1,86 @@
+{
+  fetchFromGitHub,
+  imagemagick,
+  lib,
+  stdenvNoCC,
+  theme ? "wave",
+  style ? "window",
+  side ? "left",
+  color ? "dark",
+  screenVariant ? "1080p",
+  width ? null,
+  height ? null,
+}: let
+  customResolution = width != null && height != null;
+  fontSizes = {
+    "1080p" = "16";
+    "2k" = "24";
+    "4k" = "32";
+  };
+  fontSize = builtins.getAttr screenVariant fontSizes;
+  themeName =
+    "Elegant-${theme}-${style}-${side}-${color}"
+    + lib.optionalString customResolution "-${width}x${height}";
+in
+  stdenvNoCC.mkDerivation {
+    pname = "elegant-grub2-theme";
+    version = "2025-03-25";
+
+    src = fetchFromGitHub {
+      owner = "vinceliuice";
+      repo = "Elegant-grub2-themes";
+      rev = "2025-03-25";
+      hash = "sha256-M9k6R/rUvEpBTSnZ2PMv5piV50rGTBrcmPU4gsS7Byg=";
+    };
+
+    nativeBuildInputs = lib.optional customResolution imagemagick;
+
+    installPhase =
+      ''
+        runHook preInstall
+
+        theme_dir="$out/share/grub/themes/${themeName}"
+        mkdir -p "$theme_dir"
+
+        cp -a common/terminus*.pf2 "$theme_dir"/
+        cp -a common/unifont-${fontSize}.pf2 "$theme_dir"/
+        cp -a assets/assets-icons-${color}/icons-${color}-${screenVariant} "$theme_dir/icons"
+        cp -a config/theme-${style}-${side}-${color}-${screenVariant}.txt "$theme_dir/theme.txt"
+        cp -a assets/assets-other/other-${screenVariant}/select_e-${theme}-${color}.png "$theme_dir/select_e.png"
+        cp -a assets/assets-other/other-${screenVariant}/select_c-${theme}-${color}.png "$theme_dir/select_c.png"
+        cp -a assets/assets-other/other-${screenVariant}/select_w-${theme}-${color}.png "$theme_dir/select_w.png"
+        cp -a assets/assets-other/other-${screenVariant}/Default.png "$theme_dir/logo.png"
+      ''
+      + lib.optionalString customResolution ''
+        magick backgrounds/backgrounds-${theme}/background-${theme}-${style}-${side}-${color}.jpg \
+          -resize ${width}x${height}^ \
+          -gravity center \
+          -extent ${width}x${height} \
+          "$theme_dir/background.jpg"
+        magick assets/assets-other/other-${screenVariant}/${style}-${side}.png \
+          -resize x${height} \
+          -background none \
+          -gravity west \
+          -extent ${width}x${height} \
+          "$theme_dir/info.png"
+      ''
+      + lib.optionalString (!customResolution) ''
+        cp -a backgrounds/backgrounds-${theme}/background-${theme}-${style}-${side}-${color}.jpg "$theme_dir/background.jpg"
+        cp -a assets/assets-other/other-${screenVariant}/${style}-${side}.png "$theme_dir/info.png"
+      ''
+      + ''
+
+        runHook postInstall
+      '';
+
+    passthru = {
+      inherit themeName;
+    };
+
+    meta = {
+      description = "Elegant wave GRUB2 theme";
+      homepage = "https://github.com/vinceliuice/Elegant-grub2-themes";
+      license = lib.licenses.gpl3Only;
+      maintainers = [];
+    };
+  }