irclib/src/utility/user-mapper.ts

import { IUserLine } from '../types/irc.interfaces';
import { truncate } from './truncate';

export function mapUserInput(data: IUserLine, msgMaxLength = 512): string[][] {
  let output: string[][] = [];
  switch (data.command) {
    case 'topic':
      output.push([
        'TOPIC %s',
        data.arguments[0],
        data.message !== '' ? ' :' + data.message : '',
      ]);
      break;
    case 'kick':
      output.push(['KICK %s :%s', data.arguments.join(' '), data.message]);
      break;
    case 'part':
      output.push(['PART %s :%s', data.arguments[0], data.message]);
      break;
    case 'nick':
    case 'whois':
    case 'who':
    case 'names':
    case 'join':
      output.push(['JOIN %s', data.arguments[0]]);
      break;
    case 'quit':
      output.push(['QUIT :%s', data.message]);
      break;
    case 'privmsg':
    case 'notice':
      const split = data.message.split('\n');
      for (const splitMsg of split) {
        const messages = truncate(splitMsg, msgMaxLength);
        output.push(
          ...messages.map((msg) => [
            '%s %s :%s',
            data.command.toUpperCase(),
            data.arguments[0],
            msg,
          ]),
        );
      }
      break;
    case 'list':
      output.push([data.command.toUpperCase()]);
      break;
    case 'ctcp':
      let ctcpmsg = '';

      if (data.arguments[1].toLowerCase() === 'ping') {
        ctcpmsg = 'PING ' + Math.floor(Date.now() / 1000);
      } else {
        ctcpmsg = data.message;
      }

      output.push(['PRIVMSG %s :\x01%s\x01', data.arguments[0], ctcpmsg]);
      break;
    default:
      output.push([data.command.toUpperCase(), data.message]);
  }
  return output;
}