Add swaylock.

nix/configuration/roles/sway/default.nix

@@ -260,6 +260,7 @@ in
     ./graphical_session_target.nix
     ./iso.nix
     ./rofimoji.nix
+    ./lockscreen.nix
   ];
 
   options.me.swayIncludes = lib.mkOption {

nix/configuration/roles/sway/lockscreen.nix

@@ -0,0 +1,33 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}:
+
+let
+  lockscreen_sway_config = pkgs.writeTextFile {
+    name = "lockscreen.conf";
+    text = ''
+      set $lock ${pkgs.swaylock}/bin/swaylock -f -c 000000
+
+      # Hotkey to lock the screen
+      bindsym $mod+l exec $lock
+
+      exec ${pkgs.swayidle}/bin/swayidle -w \
+         timeout 300 '$lock' \
+         timeout 600 '${pkgs.sway}/bin/swaymsg "output * dpms off"' \
+              resume '${pkgs.sway}/bin/swaymsg "output * dpms on"' \
+         before-sleep '$lock'
+    '';
+  };
+in
+{
+  imports = [ ];
+
+  config = lib.mkIf config.me.graphical {
+    me.swayIncludes = [
+      lockscreen_sway_config
+    ];
+  };
+}