Discord Command Client

CommandClient_v1.js

/**
* CommandClient
* have custom commands for your bot
* @author eDroid
*/

const Discord = require("discord.js");

class CommandClient {
  constructor(client, prefix = "/"){
    this.client = client;
    this.prefix = prefix;
    this._commands = new Map();
    this._init();
  }

  _init(){
    this.client.on("message", message => {
      this._handle(message);
    });
  }

  _handle(message){
    if(!message.content.startsWith(this.prefix)) return;
    let args = message.content.split(" ");
    let cmd = args.shift().substr(1).toLowerCase();
    if(!this._commands.has(cmd)) return;
    let command = this._commands.get(cmd);
    if((typeof command.options.runIf === "function" && command.options.runIf(message)) || command.options.runIf === undefined) command.cb(args, message);
  }

  register(name, callable, opts = {}){
    if((typeof name !== "string") || (typeof callable !== "function")) return false;
    if(typeof opts !== "object") opts = {};
    if(this._commands.has(name)) return false;
    this._commands.set(name, {cb: callable, options: opts});
    return true;
  }

  unregister(name){
    return this._commands.delete(name);
  }

  setHelpCommand(options){
    return this.register("help", (args, msg) => {
      msg.channel.startTyping();
      let embed = new Discord.RichEmbed();
      embed
      .setColor(options.color ? options.color : "#000000")
      .setTitle(`Help for ${options.name ? options.name : this.client.user.username}:`)
      .setDescription(options.description ? options.description : "[arg] = optional, <arg> = required")
      .setFooter(options.footer ? (options.footer.text ? options.footer.text : this.client.user.username) : this.client.user.username, options.footer ? (options.footer.icon ? options.footer.icon : this.client.user.avatarURL) : this.client.user.avatarURL);

      let fields = [];
      new Map([...this._command.entries()].sort()).forEach((command, name) => {
        if(command.options.showHelp === false) return;

        fields.push({
          name: `${this.prefix}${name}`,
          value: [
            command.options.description ? command.options.description : "No Description",
            command.options.usage       ? `**Usage:** ${command.options.usage.replace(/{cmd}/g, `${this.prefix}${name}`)}` : "No Usage",
            command.options.example     ? `**Example:** ${command.options.example.replace(/{cmd}/g, `${this.prefix}${name}`)}` : "No Example"
            ].join("\n")
        });
      });

      if(fields.length === 0){
        fields.push({
          name: "Whoops!",
          value: "No commands found!"
        });
      }

      embed.fields = fields;

      msg.channel.send(embed).then(m => m.channel.stopTyping()).catch(console.error);
    }, {
      showHelp: false
    });
  }
}

module.exports = function(client, prefix){
  client.commands = new CommandClient(client, prefix);
  return client;
};

CommandClient_v2.js

/**
* CommandClient
* have custom commands for your bot
* @author eDroid
*/

const Discord = require("discord.js");

class CommandClient {
  constructor(client, prefix = "/"){
    this.client = client;
    this.prefix = prefix;
    this._commands = new Map();
    this._init();
  }

  _init(){
    this.client.on("message", message => {
      this._handle(message);
    });
  }

  _handle(message){
    if(!message.content.startsWith(this.prefix)) return;
    let args = message.content.split(" ");
    let cmd = args.shift().substr(this.prefix.length).toLowerCase();
    if(!this._commands.has(cmd)) return;
    let command = this._commands.get(cmd);
    if((typeof command.options.runIf === "function" && command.options.runIf(message)) || command.options.runIf === undefined) command.run(args, message);
  }

  register(name, callable, opts = {}){
    if((typeof name !== "string") || (typeof callable !== "function")) return false;
    if(typeof opts !== "object") opts = {};
    if(this._commands.has(name)) return false;
    this._commands.set(name, {name: name, run: callable, options: opts});
    return true;
  }

  unregister(name){
    return this._commands.delete(name);
  }

  hasCommand(name){
    return this._commands.has(name);
  }
  
  getCommand(name){
    return this._commands.get(name);
  }
  
  getCategories(){
    let categories = [];
    this._commands.forEach(command => typeof command.options.category === "string" && categories.indexOf(command.options.category) === -1 ? categories.push(command.options.category) : null);
    return categories;
  }
  
  getUncategorizedCommands(){
    return Array.from(this._commands.values()).filter(command => typeof command.options.category === "undefined").sort((x, y) => x.name < y.name ? -1 : x.name > y.name ? 1 : 0);
  }
  
  getCommandsByCategory(category){
    return Array.from(this._commands.values()).filter(command => typeof command.options.category === "string" && command.options.category === category).sort((x, y) => x.name < y.name ? -1 : x.name > y.name ? 1 : 0);
  }
  
  setHelpCommand(options){
    return this.register("help", (args, msg) => {
      if(args.length === 0){
        msg.channel.startTyping();
        let embed = new Discord.RichEmbed();
        embed
          .setColor(options.color ? options.color : "#000000")
          .setTitle(`Help for ${options.name ? options.name : this.client.user.username}:`)
          .setDescription(options.description ? options.description : `Run \`${this.prefix}help [command]\` for help on a certain command.`)
          .addBlankField()
          .setFooter(options.footer ? (options.footer.text ? options.footer.text : this.client.user.username) : this.client.user.username, options.footer ? (options.footer.icon ? options.footer.icon : this.client.user.avatarURL) : this.client.user.avatarURL);

        this.getCategories().forEach(category => {
          embed.addField(category, this.getCommandsByCategory(category).filter(command => command.options.showHelp !== false).map(command => this.prefix + command.name).join("\n"), true);
        });
        
        if(this.getUncategorizedCommands().length > 0) embed.addField("Uncategorized", this.getUncategorizedCommands().filter(command => command.options.showHelp !== false).map(command => this.prefix + command.name).join("\n"), true);

        msg.channel.send(embed).then(m => m.channel.stopTyping()).catch(e => {
          console.error(e);
          msg.reply("An error occured while sending embed!");
        });
      }else if(args.length > 0){
        let cmd = args[0].toLowerCase();
        if(this.hasCommand(cmd)){
          let command = this.getCommand(cmd);
          
          if(command.options.showHelp === false){
            msg.reply("No help found for that command.");
            return;
          }
          
          let embed = new Discord.RichEmbed();
          embed
            .setColor(options.color ? options.color : "#000000")
            .setTitle(`Help for ${this.prefix + cmd}:`)
            .setDescription([
              "[arg] = optional, <arg> = required",
              "",
              command.options.description ? command.options.description : "No Description",
              command.options.usage       ? `**Usage:** ${command.options.usage.replace(/{cmd}/g, `${this.prefix}${name}`)}` : "No Usage",
              command.options.example     ? `**Example:** ${command.options.example.replace(/{cmd}/g, `${this.prefix}${name}`)}` : "No Example"
            ].join("\n"));

          msg.channel.send(embed).then(m => m.channel.stopTyping()).catch(e => {
            console.error(e);
            msg.reply("An error occured while sending embed!");
          });
        }else{
          msg.reply("Command not found!");
        }
      }
    }, {
      showHelp: false
    });
  }
}

module.exports = function(client, prefix){
  client.commands = new CommandClient(client, prefix);
  return client;
};

EXAMPLE.md

const Discord = require("discord.js");
const Client = new Discord.Client();

const CommandClient = require("./CommandClient");

CommandClient(Client, "!");

Client.commands.register("ping", (args, message) => {
  message.reply("Pong!");
}, {
  runIf: m => m.author.id === "1234567890"
});

Client.commands.register("eval", (args, message) => {
  eval(args.join(" "));
}, {
  runIf: m => {
    if(m.author.id !== "1234567890"){
      m.reply("You aren't allowed to use this command!");
      return false;
    }
    return true;
  },
  showHelp: false
});