help.js

const { prefix } = require('../../config.json');
const commandConfig = require('../../commands.json');
const Discord = require('discord.js');
const fs = require('fs');

module.exports = {
    name: 'help',
    description: 'Lists all commands, or specific info for a command',
    aliases: ['commands'],
    usage: '[command name]',
    cooldown: 0,
    execute(message, args) {
        const { commands } = message.client;

        const embedInitial = new Discord.RichEmbed()
            .setTitle(`**List of Commands:**`)
            .setDescription(`\nUse \`${prefix}help [command name]\` to get info on a specific command`)
            .setColor(0x00AE86)
            .setTimestamp();

        let commandList = [];

        if (!args.length) {
            const commandFolders = fs.readdirSync('./commands/');
            for (const folder of commandFolders) {
                const commandFiles = fs.readdirSync(`./commands/${folder}`).filter(file => file.endsWith('.js'));
                for (const file of commandFiles) {
                    const command = require(`../${folder}/${file}`);
                    commandList.push(command.name);
                }
                let groupConfig = commandConfig[folder];
                let embedFieldBody = "`" + commandList.join("`, `") + "`";
                embedInitial.addField(groupConfig.group + " (`" + groupConfig.prefix + prefix + "`)", embedFieldBody);
            }

            return message.author.send(embedInitial)
                .then(() => {
                    if (message.channel.type === 'dm') return;
                    message.reply(`Help is in your DM's!`);
                })
                .catch(error => {
                    console.error(`Could not send help DM to ${message.author.tag}.\n`, error);
                    message.reply(`I can't seem like I can\'t DM you! Do you have DMs disabled?`);
                });
        }

        const name = args[0].toLowerCase();
        const command = commands.get(name) || commands.find(c => c.aliases && c.aliases.includes(name));

        if (!command) {
            return message.reply(`Sorry, that's not a valid command`);
        }

        const embed = new Discord.RichEmbed()
            .setTitle(`**${command.name}**`)
            .setColor(0x00AE86)
            .setTimestamp();
        if (command.aliases) embed.addField("**Aliases:**", command.aliases);
        if (command.description) embed.addField("**Description:**", command.description);
        if (command.usage) embed.addField("**Usage:**", command.usage);
        if (command.cooldown) embed.addField("**Cooldown:**", command.cooldown);

        message.channel.send(embed);
    },
};