app.js

const Discord = require("discord.js")
const client = new Discord.Client()
const fs = require('fs')
const inquirer = require('inquirer')
const figlet = require('figlet')
const chalk = require('chalk')
const request = require('request')

//here we check if the user(config) exists, if it dosent we run firstTimeSetup() to make a config file
if (fs.existsSync('./user.json')) {
    var user = require('./user.json')
    clear()
    startDiscord(user.token)
}

else {
    firstTimeSetup().then(user =>{
        clear()
        startDiscord(user.token)
    }).catch(err =>{console.log(err)})
}

async function firstTimeSetup() {
    var prompts = [{
        name: 'start',
        message: `Seems like this is your first time using discord-mass-emote-downloader!\nI'll run you thru setup \n[Hit enter to continue]`
    },
    {
        name: 'token',
        message: 'Whats you discord token? (needed fetch emotes and guilds)\nRefer here to find your token: https://i.gangweed.net/QgsmCM\nRight click to paste\n\ntoken: '
    },
    ]
    await inquirer.prompt(prompts).then(answers =>{
        fs.writeFileSync('./user.json', JSON.stringify(answers) , 'utf-8');
    })
    
    var user = require("./user.json")
    return user
}


//heres where the real fun starts
function startDiscord(token){
    //once bot is ready we start firing
    client.on('ready', () => {
        //map every guild so we can see name/id to choose
        var guilds = client.guilds.map(a => {
            return a.name + ' id:' + a.id
        })
        //clears console and shows user, then asks the question
        clear()
        console.log(`Logged in as ${client.user.tag}`)
        inquirer.prompt([
            {
                name: 'guild_name',
                type: 'list',
                message: 'What server would you like to steal emotes off? xqcM',
                choices: guilds
            }
        ]).then(answer => {
            clear()
            //creates folder based off guild chosen
            result = answer.guild_name.split(':')
            dir = result[0].split(' ')
            console.log(`Creating folder "${dir[0]}" to store emotes in...`)
            makedir(`./${dir[0]}`).then(() => {
                //starts downloading all the images
                var emotes = client.guilds.get(result[1]).emojis.map(a =>{return a.url})
                succesful = 0
                failed = 0
                for(i = 0;emotes.length > i;i++) {
                    emoteName = emotes[i].split('/').splice(-1)
                    request.get(emotes[i]).on('error', (err) => {console.log(err); failed++}).pipe(fs.createWriteStream(`./${dir[0]}/${emoteName}`))
                    succesful++
                }
                console.log(`${chalk.green(`${succesful} emotes succesfully retrieved!`)}\n ${chalk.red(`${failed} failed.`)}\n\nIf you would like to steal more emotes please relaunch`)
            })
        })
    })                          

    //here we actually login...
    client.login(token).catch(err =>{
        if(err.toString().includes('Incorrect login details were provided') || err.toString().includes('An invalid token was provided')) {
            console.log('Incorrect login details!\nrelaunch to rerun setup')
            fs.unlinkSync('./user.json')
        }
        else console.log(err)
    })
}

//clear console and write emote stealer
function clear() {
    process.stdout.write('\033c');
    console.log(chalk.red(figlet.textSync('Emote_Stealer', { horizontalLayout: 'full' })))
}

//make a new folder for guild to store emotes in
async function makedir(dir) {
    await fs.mkdir(dir, err => { 
        if (err && err.code != 'EEXIST') return console.log(err)
    })
}