amberol: add module

Amberol is a small and simple music player.

modules/misc/news.nix

@@ -1470,6 +1470,14 @@ in {
         '';
       }
 
+      {
+        time = "2024-03-28T17:02:19+00:00";
+        condition = hostPlatform.isLinux;
+        message = ''
+          A new module is available: 'services.amberol'.
+        '';
+      }
+
       {
         time = "2024-04-08T21:43:38+00:00";
         message = ''
@@ -1516,6 +1524,19 @@ in {
           packages. See https://python-poetry.org/ for more.
         '';
       }
+
+      {
+        time = "2024-04-22T18:04:47+00:00";
+        condition = hostPlatform.isLinux;
+        message = ''
+          A new module is available: 'services.amberol'.
+
+          Amberol is a music player with no delusions of grandeur. If you just
+          want to play music available on your local system then Amberol is the
+          music player you are looking for. See https://apps.gnome.org/Amberol/
+          for more.
+        '';
+      }
     ];
   };
 }

modules/modules.nix

@@ -261,8 +261,9 @@ let
     ./programs/zsh.nix
     ./programs/zsh/prezto.nix
     ./programs/zsh/zsh-abbr.nix
-    ./services/arrpc.nix
     ./services/activitywatch.nix
+    ./services/amberol.nix
+    ./services/arrpc.nix
     ./services/autorandr.nix
     ./services/avizo.nix
     ./services/barrier.nix

modules/services/amberol.nix

@@ -0,0 +1,70 @@
+{ config, lib, pkgs, ... }:
+
+let
+
+  cfg = config.services.amberol;
+
+in {
+  meta.maintainers = with lib.maintainers; [ surfaceflinger ];
+
+  options.services.amberol = {
+    enable = lib.mkEnableOption "" // {
+      description = ''
+        Whether to enable Amberol music player as a daemon.
+
+        Note, it is necessary to add
+        ```nix
+        programs.dconf.enable = true;
+        ```
+        to your system configuration for the daemon to work correctly.
+      '';
+    };
+
+    package = lib.mkPackageOption pkgs "amberol" { };
+
+    enableRecoloring = lib.mkOption {
+      type = lib.types.bool;
+      default = true;
+      description = "UI recoloring using the album art.";
+    };
+
+    replaygain = lib.mkOption {
+      type = lib.types.enum [ "album" "track" "off" ];
+      default = "track";
+      description = "ReplayGain mode.";
+    };
+  };
+
+  config = lib.mkIf cfg.enable {
+    assertions = [
+      (lib.hm.assertions.assertPlatform "services.amberol" pkgs
+        lib.platforms.linux)
+    ];
+
+    # Running amberol will just attach itself to gapplication service.
+    home.packages = [ cfg.package ];
+
+    dconf.settings."io/bassi/Amberol" = {
+      background-play = true;
+      enable-recoloring = cfg.enableRecoloring;
+      replay-gain = cfg.replaygain;
+    };
+
+    systemd.user.services.amberol = {
+      Unit = {
+        Description = "Amberol music player daemon";
+        Requires = [ "dbus.service" ];
+        After = [ "graphical-session-pre.target" ];
+        PartOf = [ "graphical-session.target" ];
+      };
+
+      Install.WantedBy = [ "graphical-session.target" ];
+
+      Service = {
+        ExecStart = "${lib.getExe cfg.package} --gapplication-service";
+        Restart = "on-failure";
+        RestartSec = 5;
+      };
+    };
+  };
+}