slim: remove duplicate code

lib/maintainers.nix

@@ -31,6 +31,7 @@
   ianwookim = "Ian-Woo Kim <ianwookim@gmail.com>";
   iElectric = "Domen Kozar <domen@dev.si>";
   iyzsong = "Song Wenwu <iyzsong@gmail.com>";
+  JagaJaga = "Arseniy Seroka <ars.seroka@gmail.com>";
   jcumming = "Jack Cummings <jack@mudshark.org>";
   kkallio = "Karn Kallio <tierpluspluslists@gmail.com>";
   ktosiek = "Tomasz Kontusz <tomasz.kontusz@gmail.com>";

nixos/modules/services/x11/display-managers/slim.nix

@@ -85,7 +85,9 @@ in
       
       package = mkOption {
         type = types.package;
-        default = pkgs.slim;
+        default = pkgs.slim.override { 
+          theme = slimThemesDir; 
+          };
         description = ''
           Configure slim package.
         '';

pkgs/applications/display-managers/slim/default.nix

@@ -2,18 +2,7 @@
 , fontconfig, freetype, pam, dbus_libs, makeWrapper, pkgs, theme ? null }:
 
 let 
-  slimThemesDir =
-      let
-        unpackedTheme = pkgs.stdenv.mkDerivation {
-          name = "slim-theme";
-          buildCommand = ''
-            ensureDir $out
-            cd $out
-            unpackFile ${theme}
-            ln -s * default
-          '';
-        };
-    in if theme == null then "$out/share/slim/themes" else unpackedTheme;
+  slimThemesDir = if theme == null then "$out/share/slim/themes" else theme;
 in
 
 stdenv.mkDerivation rec {