playing with custom gtk theme

still pretty ugly unfortunately

modules/nixos/graphical/default.nix

@@ -3,6 +3,7 @@
   imports = [
     ./dunst.nix
     ./fonts.nix
+    ./gtk.nix
     ./i3.nix
     ./picom.nix
     ./polybar.nix

modules/nixos/graphical/gtk.nix

@@ -0,0 +1,116 @@
+{ config, pkgs, lib, ... }:
+
+let
+
+  # Based on: https://gitlab.com/rycee/nur-expressions/-/blob/7ae92e3497e1f1805fb849510120e2ee393018cd/pkgs/materia-theme/default.nix
+  gtkTheme = pkgs.stdenv.mkDerivation rec {
+    pname = "materia-custom";
+    version = "20210322";
+    src = pkgs.fetchFromGitHub {
+      owner = "nana-4";
+      repo = "materia-theme";
+      rev = "v${version}";
+      sha256 = "1fsicmcni70jkl4jb3fvh7yv0v9jhb8nwjzdq8vfwn256qyk0xvl";
+    };
+    nativeBuildInputs = with pkgs; [
+      bc
+      optipng
+      sassc
+
+      (runCommandLocal "rendersvg" { } ''
+        mkdir -p $out/bin
+        ln -s ${resvg}/bin/resvg $out/bin/rendersvg
+      '')
+    ];
+
+    dontConfigure = true;
+
+    # Fixes problem "Fontconfig error: Cannot load default config file"
+    FONTCONFIG_FILE =
+      pkgs.makeFontsConf { fontDirectories = [ pkgs.cantarell-fonts ]; };
+
+    # Derivation adds an extra # so we need to remove it from our colorscheme
+    theme = let stripHash = color: lib.strings.removePrefix "#" color;
+    in lib.generators.toKeyValue { } {
+      # Color selection copied from
+      # https://github.com/pinpox/nixos-home/blob/1cefe28c72930a0aed41c20d254ad4d193a3fa37/gtk.nix#L11
+      ACCENT_BG = stripHash config.theme.colors.base0B;
+      ACCENT_FG = stripHash config.theme.colors.base00;
+      BG = stripHash config.theme.colors.base00;
+      BTN_BG = stripHash config.theme.colors.base02;
+      BTN_FG = stripHash config.theme.colors.base06;
+      FG = stripHash config.theme.colors.base05;
+      HDR_BG = stripHash config.theme.colors.base02;
+      HDR_BTN_BG = stripHash config.theme.colors.base01;
+      HDR_BTN_FG = stripHash config.theme.colors.base05;
+      HDR_FG = stripHash config.theme.colors.base05;
+      MATERIA_SURFACE = stripHash config.theme.colors.base01;
+      MATERIA_VIEW = stripHash config.theme.colors.base01;
+      MENU_BG = stripHash config.theme.colors.base02;
+      MENU_FG = stripHash config.theme.colors.base06;
+      SEL_BG = stripHash config.theme.colors.base04;
+      SEL_FG = stripHash config.theme.colors.base05;
+      TXT_BG = stripHash config.theme.colors.base02;
+      TXT_FG = stripHash config.theme.colors.base07;
+      WM_BORDER_FOCUS = stripHash config.theme.colors.base03;
+      WM_BORDER_UNFOCUS = stripHash config.theme.colors.base02;
+
+      MATERIA_COLOR_VARIANT = if config.theme.dark then "dark" else "light";
+      MATERIA_STYLE_COMPACT = "True";
+      UNITY_DEFAULT_LAUNCHER_STYLE = "False";
+    };
+
+    passAsFile = [ "theme" ];
+
+    postPatch = ''
+      patchShebangs .
+
+      sed -e '/handle-horz-.*/d' -e '/handle-vert-.*/d' \
+        -i ./src/gtk-2.0/assets.txt
+    '';
+
+    buildPhase = ''
+      export HOME="$NIX_BUILD_ROOT"
+      ./change_color.sh \
+         -i False \
+         -t $out/share/themes \
+         -o "materia-custom" \
+         "$themePath"
+    '';
+  };
+
+in {
+
+  config = lib.mkIf config.gui.enable {
+
+    home-manager.users.${config.user} = {
+
+      gtk = let
+        gtkExtraConfig = {
+          gtk-application-prefer-dark-theme = config.theme.dark;
+        };
+      in {
+        enable = true;
+        theme = {
+          name = "materia-custom";
+          package = gtkTheme;
+        };
+        gtk3.extraConfig = gtkExtraConfig;
+        gtk4.extraConfig = gtkExtraConfig;
+      };
+
+    };
+
+    # Make the login screen dark
+    services.xserver.displayManager.lightdm.greeters.gtk.theme = {
+      name = config.home-manager.users.${config.user}.gtk.theme.name;
+      package = gtkTheme;
+    };
+
+    environment.sessionVariables = {
+      GTK_THEME = config.home-manager.users.${config.user}.gtk.theme.name;
+    };
+
+  };
+
+}

modules/nixos/graphical/xorg.nix

@@ -36,9 +36,6 @@
           enable = config.services.xserver.enable;
           background = config.wallpaper;
 
-          # Make the login screen dark
-          greeters.gtk.theme = gtkTheme;
-
           # Show default user
           # Also make sure /var/lib/AccountsService/users/<user> has SystemAccount=false
           extraSeatDefaults = ''
@@ -59,8 +56,6 @@
     services.dbus.packages = [ pkgs.dconf ];
     programs.dconf.enable = true;
 
-    environment.sessionVariables = { GTK_THEME = config.gtk.theme.name; };
-
     home-manager.users.${config.user} = {
 
       programs.fish.shellAliases = {
@@ -68,17 +63,6 @@
         pbpaste = "xclip -selection clipboard -out";
       };
 
-      gtk = let
-        gtkExtraConfig = {
-          gtk-application-prefer-dark-theme = config.theme.dark;
-        };
-      in {
-        enable = true;
-        theme = gtkTheme;
-        gtk3.extraConfig = gtkExtraConfig;
-        gtk4.extraConfig = gtkExtraConfig;
-      };
-
     };
 
   };