gmail_to_discord.js

function main() {
  const data = GmailApp.search('label:to_radtech is:unread', 0, 100); //to_radtechを設定したラベル名に
  var i = 0;

  while (data[i]) {
    var message = data[i].getMessages();
    var p = 0;
    while (message[p]) {
      if (message[p].isUnread()) {
        var content = "件名: " + message[p].getSubject() + "\n\n" + message[p].getBody();
        if (content.length > 2000) {
          content = content.substring(1900, -1);
          content += "\n\n-- 文字数制限突破しそうなので切りますた --";
        }
        
        var name = message[p].getFrom();
        if (name.length > 32) {
          name = name.substring(30, -1);
          name += "…";
        }
        
        var option = {
          "method": "post",
          "payload": {
            "username": name,
            "content": content
          }
        };
        UrlFetchApp.fetch("https://discordapp.com/api/webhooks/00000000/xxxxxxxxxxx", option); //DiscordのWebHook URL
      }
      p++;
    }

    data[i].markRead();
    i++;
  }
}