gmail_cleanup.js

function cleanupGithub() {
  const githubThreads = GmailApp.getUserLabelByName('Github Notifications').getThreads();
  githubThreads.forEach(thread => {
    const messages = thread.getMessages();
    let threadDone = false;
    const threadOld = isOld(thread.getLastMessageDate())

    for (let message of messages) {
      if (isDeploymentMessage(message)) {
        console.log(`Deployment message (trashing message) ${message.getSubject()} (${message.getThread().getPermalink()})`)
        message.moveToTrash();
      } else if (isAssignmentMessage(message)) {
        console.log(`Assignment message (trashing message) ${message.getSubject()} (${message.getThread().getPermalink()})`)
        message.moveToTrash();
      } else if (isRunFailedMessage(message)) {
        console.log(`Run failed message (trashing thread ) ${message.getSubject()} (${message.getThread().getPermalink()})`)
        thread.moveToTrash();
        break;
      } else if (isMergeConfirmation(message)) {
        console.log(`Merge confirmation (thread DONE)      ${message.getSubject()} (${message.getThread().getPermalink()})`)
        threadDone = true;
      } else {
        console.log(`Nothing to do for message             ${message.getSubject()} (${message.getThread().getPermalink()})`)
      }
    }

    if (threadDone && threadOld) {
      console.log(`Delete Thread                           ${thread.getFirstMessageSubject()} (${thread.getPermalink()}) because done and old`)
      thread.moveToTrash()
    }
  })


  /**
   * @param {GmailApp.GmailMessage} message
   */
  function isDeploymentMessage(message) {
    const body = message.getPlainBody()
    return message.getFrom().match(/\[bot\]/) && body.match(/Deployments|Open deployed CreativeEditor SDK Guides/)
  }

  /**
   * @param {GmailApp.GmailMessage} message
   */
  function isAssignmentMessage(message) {
    const body = message.getPlainBody()
    return message.getFrom().match(/\[bot\]/) && body.match(/Assigned/)
  }

  /**
   * @param {GmailApp.GmailMessage} message
   */
  function isRunFailedMessage(message) {
    return message.getSubject().match(/\] (PR r|R)un (failed|cancelled)/)
  }

  /**
   * @param {GmailApp.GmailMessage} message
   */
  function isMergeConfirmation(message) {
    return message.getPlainBody().match(/Merged #\d+ into \D+./)
  }

  /**
   * @param {Date} date
   */
  function isOld(date) {
    const now = new Date().valueOf()
    const then = date.valueOf();
    const twoDays = 2 * 24 * 60 * 60 * 1000
    return (now - then) > twoDays;
  }
}