caffeine: add service

.github/CODEOWNERS

@@ -136,6 +136,8 @@
 
 /modules/programs/zsh/prezto.nix                      @NickHu
 
+/modules/services/caffeine.nix                        @uvNikita
+
 /modules/services/cbatticon.nix                       @pmiddend
 
 /modules/services/clipmenu.nix                        @DamienCassou

modules/misc/news.nix

@@ -1720,6 +1720,14 @@ in
           A new module is available: 'programs.gh'.
         '';
       }
+
+      {
+        time = "2020-11-01T11:17:02+00:00";
+        condition = hostPlatform.isLinux;
+        message = ''
+          A new module is available: 'services.caffeine'.
+        '';
+      }
     ];
   };
 }

modules/modules.nix

@@ -132,6 +132,7 @@ let
     (loadModule ./programs/zsh.nix { })
     (loadModule ./programs/zsh/prezto.nix { })
     (loadModule ./services/blueman-applet.nix { })
+    (loadModule ./services/caffeine.nix { condition = hostPlatform.isLinux; })
     (loadModule ./services/cbatticon.nix { condition = hostPlatform.isLinux; })
     (loadModule ./services/clipmenu.nix { condition = hostPlatform.isLinux; })
     (loadModule ./services/compton.nix { })

modules/services/caffeine.nix

@@ -0,0 +1,33 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.caffeine;
+
+in {
+  meta.maintainers = [ maintainers.uvnikita ];
+
+  options = {
+    services.caffeine = { enable = mkEnableOption "Caffeine service"; };
+  };
+
+  config = mkIf cfg.enable {
+    systemd.user.services.caffeine = {
+      Unit = { Description = "caffeine"; };
+
+      Install = { WantedBy = [ "graphical-session.target" ]; };
+
+      Service = {
+        Restart = "on-failure";
+        PrivateTmp = true;
+        ProtectSystem = "full";
+        ProtectHome = "yes";
+        Type = "exec";
+        Slice = "session.slice";
+        ExecStart = "${pkgs.caffeine-ng}/bin/caffeine";
+      };
+    };
+  };
+}