home: wm: add screen-lock

home/wm/default.nix

@@ -1,4 +1,4 @@
-{ config, lib, ... }:
+{ config, lib, pkgs, ... }:
 let
   mkRelatedOption = description: relatedWMs:
     let
@@ -14,6 +14,7 @@ in
     ./i3.nix
     ./i3bar.nix
     ./rofi.nix
+    ./screen-lock.nix
   ];
 
   options.my.home.wm = with lib; {
@@ -35,5 +36,23 @@ in
     rofi = {
       enable = mkRelatedOption "rofi menu" [ "i3" ];
     };
+
+    screen-lock = {
+      enable = mkRelatedOption "automatic X screen locker" [ "i3" ];
+
+      command = mkOption {
+        type = types.str;
+        default = "${pkgs.i3lock}/bin/i3lock -n -c 000000";
+        example = "\${pkgs.i3lock}/bin/i3lock -n -i lock.png";
+        description = "Locker command to run";
+      };
+
+      timeout = mkOption {
+        type = types.ints.between 1 60;
+        default = 5;
+        example = 1;
+        description = "Inactive time interval to lock the screen automatically";
+      };
+    };
   };
 }

home/wm/screen-lock.nix

@@ -0,0 +1,15 @@
+{ config, lib, ... }:
+let
+  cfg = config.my.home.wm.screen-lock;
+in
+{
+  config = lib.mkIf cfg.enable {
+    services.screen-locker = {
+      enable = true;
+
+      inactiveInterval = cfg.timeout;
+
+      lockCmd = cfg.command;
+    };
+  };
+}