{ pkgs }:

let
  hooks = pkgs.writeText "pigeon-hooks.json" (builtins.toJSON [{
    id = "release";
    execute-command = "{./pigeon.sh}";
    include-command-output-in-response = false;
    pass-arguments-to-command = [
      { source = "payload"; name = "project.git_http_url"; }
      { source = "payload"; name = "project.id"; }
      { source = "payload"; name = "tag"; }
      { source = "payload"; name = "commit.id"; }
    ];
    trigger-rule.and = [
      {
        match = {
          type = "value";
          parameter = { source = "header"; name = "X-Gitlab-Event"; };
          value = "Release Hook";
        };
        match = {
          type = "value";
          parameter = { source = "payload"; name = "action"; };
          value = "create";
        };
        match = {
          type = "value";
          parameter = { source = "header"; name = "X-Gitlab-Token"; };
          value = "{{ getenv `PIGEON_GITLAB_TOKEN` | js }}";
        };
      }
    ];
  }]);
in
  pkgs.writeShellApplication {
    name = "pigeon";
    runtimeInputs = [ pkgs.webhook ];
    text = ''
      : ''${PIGEON_GITLAB_TOKEN:?}
      exec webhook -hooks ${hooks} -template -port "''${PIGEON_PORT:-9000}" -verbose
    '';
  }