style: change sddm theme

pkgs/sddm-themes/aerial.nix

@@ -0,0 +1,33 @@
+{
+  pkgs,
+  lib,
+  stdenvNoCC,
+  themeConfig ? null,
+}:
+stdenvNoCC.mkDerivation {
+  name = "aerial-sddm-theme";
+
+  dontWrapQtApps = true;
+
+  src = pkgs.fetchFromGitHub {
+    owner = "3ximus";
+    repo = "aerial-sddm-theme";
+    rev = "484b52e";
+    sha256 = "sha256-YeJTdlnGV58MNB8VpjDrFuC3VNsh5SgTdZH63aLD6Xw=";
+  };
+
+  installPhase =
+    let
+      iniFormat = pkgs.formats.ini { };
+      configFile = iniFormat.generate "" { General = themeConfig; };
+      basePath = "$out/share/sddm/themes/sddm-aerial-theme";
+    in
+    ''
+      mkdir -p ${basePath}
+      cp -r $src/* ${basePath}
+    ''
+    + lib.optionalString (themeConfig != null) ''
+      ln -sf ${configFile} ${basePath}/theme.conf.user
+    '';
+
+}