Add flake & module

flake.nix

@@ -0,0 +1,43 @@
+{
+  description = "Tattler Notification Listener";
+
+  inputs = {
+    nixpkgs.url = "nixpkgs/nixos-22.05";
+    utils.url = "github:numtide/flake-utils";
+    helpers = {
+      url = "git+https://git.fudo.org/fudo-public/nix-helpers.git";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = { self, nixpkgs, utils, helpers, ... }:
+    utils.lib.eachDefaultSystem (system:
+      let pkgs = nixpkgs.legacyPackages."${system}";
+      in {
+        packages = rec {
+          default = tattler;
+          tattler = helpers.packages."${system}".mkClojureBin {
+            name = "org.fudo/tattler";
+            primaryNamespace = "tattler.cli";
+            src = ./.;
+          };
+        };
+
+        devShells = rec {
+          default = updateDeps;
+          updateDeps = pkgs.mkShell {
+            buildInputs = with helpers.packages."${system}";
+              [ updateClojureDeps ];
+          };
+          tattler = pkgs.mkShell {
+            buildInputs = with self.packages."${system}"; [ tattler-server ];
+          };
+        };
+      }) // {
+        nixosModules = rec {
+          default = tattler;
+          tattler = import ./module.nix self.packages;
+        };
+      };
+
+}

module.nix

@@ -0,0 +1,65 @@
+packages:
+
+{ config, lib, pkgs, ... }:
+
+with lib;
+let
+  tattler = packages."${pkgs.system}".tattler;
+  cfg = config.services.tattler;
+
+in {
+  options.services.tattler = with types; {
+    enable = mkEnableOption "Enable Tattler notification listener.";
+
+    verbose = mkEnableOption "Generate verbose logs and output.";
+
+    notification-topic = mkOption {
+      type = str;
+      description = "MQTT topic on which to send notifications.";
+    };
+
+    mqtt = {
+      host = mkOption {
+        type = str;
+        description = "Hostname of the MQTT server.";
+      };
+
+      port = mkOption {
+        type = port;
+        description = "Port on which the MQTT server is listening.";
+        default = 1883;
+      };
+
+      user = mkOption {
+        type = nullOr str;
+        description = "User as which to connect to the MQTT server.";
+        default = null;
+      };
+
+      password-file = mkOption {
+        type = nullOr str;
+        description =
+          "User password file with which to connect to the MQTT server.";
+        default = null;
+      };
+    };
+  };
+
+  config = mkIf enable {
+    systemd.user.services.tattler = {
+      path = [ tattler ];
+      wantedBy = [ "default.target" ];
+      serviceConfig = {
+        ExecStart = pkgs.writeShellScript "tattler.sh" (concatStringsSep " " ([
+          "tattler"
+          "--mqtt-host=${cfg.mqtt.host}"
+          "--mqtt-port=${cfg.mqtt.port}"
+          "--notification-topic=${cfg.notification-topic}"
+        ] ++ (optional cfg.verbose "--verbose")
+          ++ (optional cfg.mqtt.user "--mqtt-user=${cfg.mqtt.user}")
+          ++ (optional cfg.mqtt.password-file
+            "--mqtt-user=${cfg.mqtt.password-file}")));
+      };
+    };
+  };
+}