Use modules folder

modules/theme/default.nix

@@ -0,0 +1,11 @@
+let
+  theme = import ./everforest;
+  colors = {
+    undefined = "#ff00ff";
+    fg1 = "#ffffff";
+  };
+in
+{
+  css = lib: lib.strings.concatStringsSep "\n" (lib.attrValues (lib.mapAttrs (k: v: "  --${k}: ${v};") theme.colors));
+}
+// theme // { colors = theme.colors // colors; }

modules/theme/everforest/default.nix

@@ -0,0 +1,24 @@
+{
+  theme = "everforest";
+
+  kitty-theme = "Everforest Dark Hard";
+  gtkTheme = pkgs: {
+    package = pkgs.callPackage ./gtk.nix {};
+    name = "Everforest-Dark-BL";
+  };
+  gtkIconTheme = pkgs: {
+    package = pkgs.callPackage ./gtk.nix {};
+    name = "Everforest-Dark";
+  };
+  wallpaper = "306286.jpg";
+
+  colors = {
+    bg0 = "#1e2326";
+    bg1 = "#272e33";
+    bg2 = "#2e383c";
+    fg0 = "#d3c6aa";
+    primary = "#a7c080";
+    alert = "#e67e80";
+    disabled = "#2e383c";
+  };
+}

modules/theme/everforest/gtk.nix

@@ -0,0 +1,49 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, gtk-engine-murrine
+, jdupes
+}:
+
+stdenv.mkDerivation rec {
+  pname = "everforest-gtk";
+  version = "unstable-2022-12-09";
+
+  src = fetchFromGitHub {
+    owner = "Fausto-Korpsvart";
+    repo = "Everforest-GTK-Theme";
+    rev = "af5920c8a16a53064cbcb7582bd7ef0ba8f44d83";
+    sha256 = "lIAJN8ljmN4RyvyPpHoAheyQBX/qyGXZsGvoTl1vt50=";
+  };
+
+  sourceRoot = ".";
+
+  nativeBuildInputs = [ jdupes ];
+
+  propagatedUserEnvPkgs = [ gtk-engine-murrine ];
+
+  installPhase = ''
+    runHook preInstall
+
+    mkdir -p $out/share/themes
+
+    for f in `find source/themes -name "*.css"`; do
+      grep -v '^  border: 1px ' $f > tmp
+      mv tmp $f
+    done
+
+    mkdir -p $out/share/themes && cp -a source/themes/* $out/share/themes
+    mkdir -p $out/share/icons && cp -a source/icons/* $out/share/icons
+
+    jdupes -L -r $out/share
+
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "Everforest colour palette for GTK";
+    homepage = "https://github.com/Fausto-Korpsvart/Everforest-GTK-Theme";
+    license = licenses.gpl3Only;
+    platforms = platforms.all;
+  };
+}

modules/theme/nord/default.nix

@@ -0,0 +1,21 @@
+{
+  theme = "nord";
+
+  kitty-theme = "Nord";
+  wallpaper = "roxynord.png";
+  gtkTheme = pkgs: {
+    package = pkgs.nordic;
+    name = "Nordic";
+  };
+  gtkIconTheme = pkgs: null;
+
+  colors = {
+    bg0 = "#2e3440";
+    bg1 = "#3b4252";
+    bg2 = "#434c53";
+    fg0 = "#eceff4";
+    primary = "#8fbcbb";
+    alert = "#bf616a";
+    disabled = "#434c5e";
+  };
+}