community-relations/src/commands/ban.ts

import moment, { unitOfTime } from 'moment';
import { Message, User } from 'eris';
import { Client, Command } from '../class';

export default class Ban extends Command {
  constructor(client: Client) {
    super(client);
    this.name = 'ban';
    this.description = 'Bans a member from the guild.';
    this.usage = 'ban <member> [time] [reason]';
    this.permissions = 3;
    this.guildOnly = true;
    this.enabled = true;
  }

  public async run(message: Message, args: string[]) {
    try {
      if (!args[0]) return this.client.commands.get('help').run(message, [this.name]);
      const member = this.client.util.resolveMember(args[0], this.mainGuild);
      let user: User;
      if (!member) {
        try {
          user = await this.client.getRESTUser(args[0]);
        } catch {
          return this.error(message.channel, 'Cannot find user.');
        }
      } else {
        user = member.user;
      }
      try {
        await this.mainGuild.getBan(args[0]);
        return this.error(message.channel, 'This user is already banned.');
      } catch {} // eslint-disable-line no-empty
      if (member && !this.client.util.moderation.checkPermissions(member, message.member)) return this.error(message.channel, 'Permission Denied.');
      message.delete();

      let momentMilliseconds: number;
      let reason: string;
      if (args.length > 1) {
        const lockLength = args[1].match(/[a-z]+|[^a-z]+/gi);
        const length = Number(lockLength[0]);
        const unit = lockLength[1] as unitOfTime.Base;
        momentMilliseconds = moment.duration(length, unit).asMilliseconds();
        reason = momentMilliseconds ? args.slice(2).join(' ') : args.slice(1).join(' ');
        if (reason.length > 512) return this.error(message.channel, 'Ban reasons cannot be longer than 512 characters.');
      }
      await this.client.util.moderation.ban(user, message.member, momentMilliseconds, reason);
      return this.success(message.channel, `${user.username}#${user.discriminator} has been banned.`);
    } catch (err) {
      return this.client.util.handleError(err, message, this, false);
    }
  }
}