gmail-line-notify-03.gs

// get priority unread emails
function getPriorityUnreadEmails() {
  let priorityUnreadEmails = [];

  // priority inbox unread emails
  const priorityInboxUnread = GmailApp.getPriorityInboxUnreadCount();
  Logger.log("Priority inbox unread : " + priorityInboxUnread);

  // new priority inbox emails
  if (priorityInboxUnread) {
    // retrieves all priority inbox unread threads
    const allPriorityInboxUnreadThreads = GmailApp.getPriorityInboxThreads(0, priorityInboxUnread);

    allPriorityInboxUnreadThreads.forEach((priorityInboxUnreadThread) => {
      let unreadEmailMessage = "";

      // gets the messages in priotiry inbox unread thread
      const messages = priorityInboxUnreadThread.getMessages();

      messages.forEach((message) => {

        // gets the sender of this message
        const sender = extractEmails(message.getFrom());

        // check sender is priority contact list
        const isPriorityContact = priorityContactListEmails.includes(sender);

        // new inbox is my contact list emails
        if (isPriorityContact) {
          // sender
          Logger.log("New Inbox Email From My Contact List : " + sender);
          unreadEmailMessage += "\n\n📥New email from : " + sender;

          // email subject
          const emailSubject = message.getSubject();
          Logger.log("Email Subject :" + emailSubject);
          unreadEmailMessage += "\n\n🏷️Subject : " + emailSubject;

          // email contents with replaces all 3 types of line breaks with single line break (\n) and more white space with single white space
          const emailContents = message.getPlainBody().replace(/(\r\n|\n|\r)+/g, "\n").replace(/( )+/g," ");
          Logger.log("Email Content :" + emailContents);

          if (emailContents.length < 300) {
            unreadEmailMessage += "\n\n📋Contents : " + emailContents;
          } else {
            unreadEmailMessage += "\n\n📋Contents : " + emailContents.slice(0, 300) + "...";
          }

          // email attatchments
          const attatchments = message.getAttachments();
          if (attatchments.length !== 0) {
            // get attachment file url for download
            const attachmentFileUrls = saveAttachmentFiles(attatchments, attachmentFolderId);

            attachmentFileUrls.forEach(fileUrl => unreadEmailMessage += "\n\n🔗Attachment File : " + fileUrl);
          }

          // marks the message as read
          message.markRead();

          // stars the message
          message.star();

          // reloads this message and associated state from Gmail
          message.refresh();

          // reply to sender
          message.reply("Got your message, Thank you.✌️\n\n" + "Chaiyachet ✌️\n\n" + "This email is auto-generated. Please do not reply.");
        }

        // add messages for send to line notify
        if (unreadEmailMessage !== "") {
          priorityUnreadEmails.push(unreadEmailMessage);
        }
      })
    })
  } else {
    Logger.log("📥 No new priority inbox unread ✌️");
  }

  return priorityUnreadEmails;
}