Trying to use brew-nix - still to much broken

modules/nixos/home-manager.nix

@@ -11,21 +11,42 @@ let
   shared-programs = import ../shared/home-manager.nix { inherit config pkgs lib;  };
   shared-files = import ../shared/files.nix { inherit config pkgs; };
 
-  polybar-user_modules = builtins.readFile (
-    pkgs.replaceVars {
-      src = ./config/polybar/user_modules.ini;
-      packages = "${xdg_configHome}/polybar/bin/check-nixos-updates.sh";
-      searchpkgs = "${xdg_configHome}/polybar/bin/search-nixos-updates.sh";
-      launcher = "${xdg_configHome}/polybar/bin/launcher.sh";
-      powermenu = "${xdg_configHome}/rofi/bin/powermenu.sh";
-      calendar = "${xdg_configHome}/polybar/bin/popup-calendar.sh";
-    }
-  );
+  polybar-user_modules = builtins.replaceStrings
+    [
+      "@packages@"
+      "@searchpkgs@"
+      "@launcher@"
+      "@powermenu@"
+      "@calendar@"
+    ]
+    [
+      "${xdg_configHome}/polybar/bin/check-nixos-updates.sh"
+      "${xdg_configHome}/polybar/bin/search-nixos-updates.sh"
+      "${xdg_configHome}/polybar/bin/launcher.sh"
+      "${xdg_configHome}/rofi/bin/powermenu.sh"
+      "${xdg_configHome}/polybar/bin/popup-calendar.sh"
+    ]
+    (builtins.readFile ./config/polybar/user_modules.ini);
 
-  polybar-config = pkgs.replaceVars {
-    src = ./config/polybar/config.ini;
-    font0 = "DejaVu Sans:size=12;3";
-    font1 = "feather:size=12;3"; # from overlay
+  polybar-config = {
+    "global/wm" = {
+      margin-bottom = 0;
+      margin-top = 0;
+    };
+    "bar/main" = {
+      width = "98%";
+      height = 40;
+      background = "#000000";
+      foreground = "#ffffff";
+      font-0 = "DejaVu Sans:size=12;3";
+      font-1 = "feather:size=12;3";
+      modules-left = "launcher workspaces";
+      modules-center = "date popup-calendar";
+      modules-right = "pulseaudio memory cpu updates sysmenu";
+    };
+    settings = {
+      screenchange-reload = false;
+    };
   };
 
   polybar-modules = builtins.readFile ./config/polybar/modules.ini;