synapse-bt: add synapse-bt service

default.nix

@@ -59,6 +59,7 @@ let
         ./modules/services/privoxy
         ./modules/services/redis
         ./modules/services/skhd
+        ./modules/services/synapse-bt.nix
         ./modules/services/synergy
         ./modules/programs/bash
         ./modules/programs/fish.nix

modules/services/synapse-bt.nix

@@ -0,0 +1,72 @@
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+  cfg = config.services.synapse-bt;
+  configOptions = recursiveUpdate {
+    port = cfg.port;
+    disk = {
+      directory = cfg.downloadDir;
+    };
+  } cfg.extraConfig;
+
+  configFile = pkgs.runCommand "config.toml" {
+    buildInputs = [ pkgs.remarshal ];
+  } ''
+    remarshal -if json -of toml \
+      < ${pkgs.writeText "config.json" (builtins.toJSON configOptions)} \
+      > $out
+  '';
+in
+
+{
+  options = {
+    services.synapse-bt = {
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Whether to run Synapse BitTorrent Daemon.";
+      };
+
+      package = mkOption {
+        type = types.package;
+        default = pkgs.synapse-bt;
+        defaultText = "pkgs.synapse-bt";
+        description = "Synapse BitTorrent package to use.";
+      };
+
+      port = mkOption {
+        type = types.int;
+        default = 16384;
+        description = "The port on which Synapse BitTorrent listens.";
+      };
+
+      downloadDir = mkOption {
+        type = types.path;
+        default = "/var/lib/synapse-bt";
+        example = "/var/lib/synapse-bt/downloads";
+        description = "Download directory for Synapse BitTorrent.";
+      };
+
+      extraConfig = mkOption {
+        default = {};
+        description = "Extra configuration options for Synapse BitTorrent.";
+        type = types.attrs;
+      };
+    };
+  };
+
+  config = mkIf cfg.enable {
+
+    environment.systemPackages = [ cfg.package ];
+
+    launchd.user.agents.synapse-bt =
+      { path = [ cfg.package ];
+        command = "${cfg.package}/bin/synapse --config ${configFile}";
+        serviceConfig.KeepAlive = true;
+        serviceConfig.RunAtLoad = true;
+      };
+
+  };
+}