add curated clightning plugins

modules/clightning-plugins/zmq.nix

@@ -0,0 +1,42 @@
+{ config, lib, ... }:
+
+with lib;
+let
+  cfg = config.services.clightning.plugins.zmq;
+
+  endpoints = [
+    "channel-opened"
+    "connect"
+    "disconnect"
+    "invoice-payment"
+    "warning"
+    "forward-event"
+    "sendpay-success"
+    "sendpay-failure"
+  ];
+
+  mkEndpointOption = name:
+    mkOption {
+      type = types.nullOr types.str;
+      default = null;
+      description = "Endpoint for ${name}";
+    };
+
+  setEndpoint = ep:
+    let value = builtins.getAttr ep cfg; in
+    optionalString (value != null) ''
+      zmq-pub-${ep}=${value}
+    '';
+in
+{
+  options.services.clightning.plugins.zmq = {
+    enable = mkEnableOption "ZMQ (clightning plugin)";
+  } // lib.genAttrs endpoints mkEndpointOption;
+
+  config = mkIf cfg.enable {
+    services.clightning.extraConfig = ''
+      plugin=${config.nix-bitcoin.pkgs.clightning-plugins.zmq.path}
+      ${concatStrings (map setEndpoint endpoints)}
+    '';
+  };
+}