mpd: add module

modules/misc/news.nix

@@ -711,6 +711,13 @@ in
           A new module is available: 'xsession.windowManager.awesome'.
         '';
       }
+
+      {
+        time = "2018-07-18T20:14:11+00:00";
+        message = ''
+          A new module is available: 'services.mpd'.
+        '';
+      }
     ];
   };
 }

modules/modules.nix

@@ -64,6 +64,7 @@ let
     ./services/keepassx.nix
     ./services/keybase.nix
     ./services/mbsync.nix
+    ./services/mpd.nix
     ./services/network-manager-applet.nix
     ./services/owncloud-client.nix
     ./services/parcellite.nix

modules/services/mpd.nix

@@ -0,0 +1,148 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  name = "mpd";
+
+  cfg = config.services.mpd;
+
+  mpdConf = pkgs.writeText "mpd.conf" ''
+    music_directory     "${cfg.musicDirectory}"
+    playlist_directory  "${cfg.playlistDirectory}"
+    ${lib.optionalString (cfg.dbFile != null) ''
+      db_file             "${cfg.dbFile}"
+    ''}
+    state_file          "${cfg.dataDir}/state"
+    sticker_file        "${cfg.dataDir}/sticker.sql"
+    log_file            "syslog"
+
+    ${optionalString (cfg.network.listenAddress != "any")
+      ''bind_to_address "${cfg.network.listenAddress}"''}
+    ${optionalString (cfg.network.port != 6600)
+      ''port "${toString cfg.network.port}"''}
+
+    ${cfg.extraConfig}
+  '';
+
+in {
+
+  ###### interface
+
+  options = {
+
+    services.mpd = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = ''
+          Whether to enable MPD, the music player daemon.
+        '';
+      };
+
+     musicDirectory = mkOption {
+        type = types.path;
+        default = "${config.home.homeDirectory}/music";
+        defaultText = "$HOME/music";
+        description = ''
+          The directory where mpd reads music from.
+        '';
+      };
+
+      playlistDirectory = mkOption {
+        type = types.path;
+        default = "${cfg.dataDir}/playlists";
+        defaultText = ''''${dataDir}/playlists'';
+        description = ''
+          The directory where mpd stores playlists.
+        '';
+      };
+
+      extraConfig = mkOption {
+        type = types.lines;
+        default = "";
+        description = ''
+          Extra directives added to to the end of MPD's configuration
+          file, <filename>mpd.conf</filename>. Basic configuration
+          like file location and uid/gid is added automatically to the
+          beginning of the file. For available options see
+          <citerefentry>
+            <refentrytitle>mpd.conf</refentrytitle>
+            <manvolnum>5</manvolnum>
+          </citerefentry>.
+        '';
+      };
+
+      dataDir = mkOption {
+        type = types.path;
+        default = "${config.xdg.dataHome}/${name}";
+        defaultText = "$XDG_DATA_HOME/mpd";
+        description = ''
+          The directory where MPD stores its state, tag cache,
+          playlists etc.
+        '';
+      };
+
+     network = {
+
+        listenAddress = mkOption {
+          type = types.str;
+          default = "127.0.0.1";
+          example = "any";
+          description = ''
+            The address for the daemon to listen on.
+            Use <literal>any</literal> to listen on all addresses.
+          '';
+        };
+
+        port = mkOption {
+          type = types.ints.positive;
+          default = 6600;
+          description = ''
+            The TCP port on which the the daemon will listen.
+          '';
+        };
+
+      };
+
+      dbFile = mkOption {
+        type = types.nullOr types.str;
+        default = "${cfg.dataDir}/tag_cache";
+        defaultText = ''''${dataDir}/tag_cache'';
+        description = ''
+          The path to MPD's database. If set to
+          <literal>null</literal> the parameter is omitted from the
+          configuration.
+        '';
+      };
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+
+    systemd.user.services.mpd = {
+      Unit = {
+        After = [ "network.target" "sound.target" ];
+        Description = "Music Player Daemon";
+      };
+ 
+      Install = {
+        WantedBy = [ "default.target" ];
+      };
+
+      Service = {
+        Environment = "PATH=%h/.nix-profile/bin";
+        ExecStart = "${pkgs.mpd}/bin/mpd --no-daemon ${mpdConf}";
+        Type = "notify";
+        ExecStartPre = ''${pkgs.bash}/bin/bash -c "${pkgs.coreutils}/bin/mkdir -p '${cfg.dataDir}' '${cfg.playlistDirectory}'"'';
+      };
+    };
+  };
+
+}