trigger-cause

def getTriggerInfo(Map env) {
  def event = env.GITHUB_EVENT_NAME
  if (event == null) {
    // Pipeline was not triggered by a GitHub event
    def cause = env.BUILD_CAUSE
    if (cause != null && cause.upcase().contains("MANUAL")) {
      return "Manually triggered"
    } else if (cause != null && cause.upcase().contains("REPLAY")) {
      def replayedCause = env.REPLAY_CAUSE
      if (replayedCause != null) {
        return "Replayed from ${replayedCause}"
      } else {
        return "Replayed"
      }
    } else if (cause != null && cause.upcase().contains("UPSTREAMTRIGGER")) {
      return "Upstream Jenkins pipeline"
    } else if (cause != null && cause.upcase().contains("TIMERTRIGGER")) {
      return "Scheduled/timed Jenkins trigger"
    } else {
      return "Unknown trigger"
    }
  }
  
  switch (event) {
    case "push":
      return "Push event"
    case "pull_request":
      def action = env.GITHUB_EVENT_ACTION
      if (action == null) {
        echo "Unable to determine GitHub pull request action."
        return null
      }
      
      switch (action) {
        case "opened":
          return "Pull request opened"
        case "reopened":
          return "Pull request reopened"
        case "closed":
          return "Pull request closed"
        case "synchronize":
          return "Pull request synchronized"
        default:
          echo "Unknown GitHub pull request action: ${action}"
          return null
      }
    case "deployment":
      return "Deployment event"
    default:
      echo "Unknown GitHub event type: ${event}"
      return null
  }
}

def triggerInfo = getTriggerInfo(env)
if (triggerInfo != null) {
  echo "Triggered by: ${triggerInfo}"
}