Discord.js live embed builder

EmbedBuilder.js

const { RichEmbed, MessageEmbed } = require('discord.js');
const Embed = RichEmbed || MessageEmbed;


const commands = {
  'title': (embed, input) => embed.setTitle(input),
  'description' (embed, input) => embed.setDescription(input),
  // etc
}

async function create(user, channel) {
  let embed = new Embed();
  let message = await channel.send(embed);
  while (true) {
    let input = await getInput(user, channel);
    if (!input) {
      throw new Error('Timed out waiting for user');
    }


    if (input === 'done') {
      return embed;
    }


    const [command, rest] = splitN(input, ' ', 2);
    const func = commands[command];
    if (!func) {
      continue; // not a command
    }
    
    embed = func(embed, );
    message = await message.edit(embed);
  }
  
  channel.send()
}

async function getInput(user, channel) {
  return (await channel.awaitMessages(m => m.author.id === user.id, {max: 1})).first();

}

function splitN(haystack, needle, n) {
  if (n <= 0) {
    throw new Error('n must be positive');
  }
  const result = [];
  let idx = haystack.indexOf(needle);
  while (--n && idx !== -1) {
    result.push(haystack.slice(0, idx);
    idx = haystack.indexOf(needle, idx + 1);
  }
  
  if (haystack) {
    result.push(haystack);
  }
  return result;
}

module.exports = create;