initial refactoring

platforms/nixos/modules/services/betterlockscreen.nix

@@ -0,0 +1,41 @@
+{
+  config,
+  pkgs,
+  lib,
+  ...
+}:
+
+let
+  cfg = config.services.betterlockscreen;
+  lockCmd = "${pkgs.betterlockscreen}/bin/betterlockscreen --lock --display 1 --blur 0.5 --span";
+in
+
+{
+
+  options.services.betterlockscreen.enable = lib.mkEnableOption "Betterlockscreen X server display lock";
+
+  config = lib.mkIf cfg.enable {
+
+    # Ref: https://github.com/betterlockscreen/betterlockscreen/blob/next/system/betterlockscreen%40.service
+    systemd.services.lock = {
+      enable = true;
+      description = "Lock the screen on resume from suspend";
+      before = [
+        "sleep.target"
+        "suspend.target"
+      ];
+      serviceConfig = {
+        User = config.user;
+        Type = "simple";
+        Environment = "DISPLAY=:0";
+        TimeoutSec = "infinity";
+        ExecStart = lockCmd;
+        ExecStartPost = "${pkgs.coreutils-full}/bin/sleep 1";
+      };
+      wantedBy = [
+        "sleep.target"
+        "suspend.target"
+      ];
+    };
+  };
+}