alvarocastro/diamondbot

import { ChatCommand } from '@diamondbot/core';

export default class HelpCommand extends ChatCommand {
    constructor (options = {}) {
        super(Object.assign({
            name: 'help',
            alias: 'commands',
            format: '[command]',
            description: 'Shows help of a given command or all commands'
        }, options));
    }

    buildHelpForCommand (command, prefix) {
        let output = `${prefix}${command.name}`;

        if (command.format) {
            output += ` ${command.format}`;
        }
        output = `\`${output}\``;
        if (command.description) {
            output += ` - ${command.description}`;
        }
        return output;
    }

    async exec ({channel}, [commandName], memory) {
        const prefix = memory.get(['config', 'prefix']);

        if (!commandName) {
            const helps = this.bot.commands
                .filter((command) => {
                    return !command.hidden;
                })
                .map((command) => {
                    return this.buildHelpForCommand(command, prefix);
                });
            channel.send(`> Commands:\n> ${helps.join('\n> ')}`);
            return;
        }

        const command = this.bot.commands.get(commandName);

        if (!command) {
            channel.send(`Command ${prefix}${commandName} not found`);
            return;
        }

        channel.send(`> Command:\n> ${this.buildHelpForCommand(command, prefix)}`);
    }
}