eris-boiler/commands/help.js

A Discord bot framework using eris

const { Command } = require('../lib')

module.exports = new Command({
  name: 'help',
  description: 'Displays this message, duh!',
  run: async (bot, context) => {
    const {
      params
    } = context

    if (params[0]) {
      return commandInfo(bot, params[0])
    }

    const { commands, longName } = await filterCommands(bot, context)

    const content = commands.reduce(
      (ax, { name, description, aliases }) => ax + `\n${name}` + (
        aliases.length > 0 ? '/' + aliases.join('/') : ''
      ) + ':' + ' '.repeat(longName - name.length) + description,
      'Available commands:```'
    ) + '\n```\nTo get more information try: `help command`'

    return {
      dm: true,
      content
    }
  }
})

async function filterCommands (bot, context) {
  const commands = []
  let longName = 0
  for (const command of bot.commands.values()) {
    const { ok } = await bot.ora.hasPermission(bot, { ...context, command })
    if (ok) {
      const {
        name,
        aliases,
        description
      } = command

      longName = Math.max(
        name.length + aliases.join('/').length + 3, longName
      )
      commands.push({ name, description, aliases })
    }
  }
  return { commands, longName }
}

function commandInfo (bot, cmd) {
  const command = bot.findCommand(cmd)

  if (!command) {
    return `${cmd} is not a command or alias!`
  }

  return {
    dm: true,
    content: '```' + command.info + '```'
  }
}