responseBot.js

//import discord.js
const Discord = require('discord.js');

//create instance of discord client
const client = new Discord.Client();

//Gets configuration information from discordConfig.json
const config = require('./discordConfig.json');

//Token for bot
const token = config.token;

//ID of Admin
const adminID = config.adminID;

//Command prefix
const prefix = config.prefix;


// The ready event is vital, it means that your bot will only start reacting to information
// from Discord _after_ ready is emitted.
client.on('ready', function(message) {
  console.log('ResponseBot is ready!');
});

//Log our bot in
client.login(token, output);

function output(error, token) {
  if (error) {
    console.log('There was an error logging in: ${error}');
    return;
  } else
    console.log('Logged in. Token: ${token}');
}

//Bot listens for a message of a particular format and responds
client.on('message', function(message) {
  if (message.author.bot) return;

  var text = message.content;
  if (text.startsWith(prefix)) {
    processCommand(message);
  } else if (text.startsWith('~') && message.author.id === adminID) {
    processAdminCommand(message);
  } else {
    processNonCommand(message);
  }
  checkForPalindrome(message);
  message.channel.stopTyping(true);
});


var commands = require('./commands.js');
var commandNames = require('./commandNames');
commands.functions.setClient(client);


//Process commands from users
function processCommand(message) {
  var text = message.content.toLowerCase();
  var command = text.split(" ")[0];
  if (commandNames[command]) {
    commands.functions[commandNames[command]](message);
  }
}

//JSON object that contians generic responses to specific messages
var responses = require('./responses.json');

//Process noncommands from anyone
function processNonCommand(message) {
  var text = message.content;
  if (responses[text]) {
    sendMessage(message, responses[text]);
  }
}

//Processes the commands by the admin based on adminID in discordConfig.json
function processAdminCommand(message) {
  var text = message.content;
  var mentions = message.mentions.users.array();
  if (text.startsWith("~" + "prefix")) {
    var arg = text.split(" ");
    config.prefix = arg[1];
    prefix = config.prefix;
  }
}

function sendMessage(message, text) {
  message.channel.startTyping();
  client.setTimeout(function() {
    message.channel.send(text);
  }, 1000);
  message.channel.stopTyping(true);
}

/*
 *
 * Logic Functions
 *
 */

function checkForPalindrome(message) {
  var text = message.content;
  if (text.includes('\n')) return;

  var responseText = text.replace(/[^\w\d\s]+/g, ""); //replaces all characters except word and whitespace characters

  var evalText = responseText.replace(/ /g, "").toLowerCase(); //replaces all spaces with empty characters
  var length = evalText.length;
  if (length < 7) return;

  for (var i = 0; i < (length / 2); i++) {
    if (evalText.charAt(i) != evalText.charAt(length - i - 1)) {
      return;
    }
  }
  sendMessage(message, "'" + responseText + "'" + " is a palindrome!");
}