poweralertd: add module

.github/CODEOWNERS

@@ -223,6 +223,8 @@
 /modules/services/playerctld.nix                      @fendse
 /tests/modules/playerctld                             @fendse
 
+/modules/services/poweralertd.nix                     @ThibautMarty
+
 /modules/services/pulseeffects.nix                    @jonringer
 
 /modules/services/random-background.nix               @rycee

modules/misc/news.nix

@@ -1897,6 +1897,14 @@ in
           A new module is available: 'programs.exa'.
         '';
       }
+
+      {
+        time = "2021-04-26T07:00:00+00:00";
+        condition = hostPlatform.isLinux;
+        message = ''
+          A new service is available: 'services.poweralertd'.
+        '';
+      }
     ];
   };
 }

modules/modules.nix

@@ -180,6 +180,7 @@ let
     (loadModule ./services/plan9port.nix { condition = hostPlatform.isLinux; })
     (loadModule ./services/playerctld.nix { condition = hostPlatform.isLinux; })
     (loadModule ./services/polybar.nix { })
+    (loadModule ./services/poweralertd.nix { condition = hostPlatform.isLinux; })
     (loadModule ./services/pulseeffects.nix { condition = hostPlatform.isLinux; })
     (loadModule ./services/random-background.nix { })
     (loadModule ./services/redshift-gammastep/redshift.nix { })

modules/services/poweralertd.nix

@@ -0,0 +1,31 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let cfg = config.services.poweralertd;
+
+in {
+  meta.maintainers = [ maintainers.thibautmarty ];
+
+  options.services.poweralertd.enable =
+    mkEnableOption "the Upower-powered power alerterd";
+
+  config = mkIf cfg.enable {
+    systemd.user.services.poweralertd = {
+      Unit = {
+        Description = "UPower-powered power alerter";
+        Documentation = "man:poweralertd(1)";
+        After = [ "graphical-session-pre.target" ];
+        PartOf = [ "graphical-session.target" ];
+      };
+
+      Install.WantedBy = [ "graphical-session.target" ];
+
+      Service = {
+        Type = "simple";
+        ExecStart = "${pkgs.poweralertd}/bin/poweralertd";
+        Restart = "always";
+      };
+    };
+  };
+}