You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: job_options_parser.rb
    path of file: ./repos/ArchiveBot/bot
    
    the code of the file until where you have to start completion: require 'shellwords'
require 'trollop'

class JobOptionsParser
  def initialize
    @parser = Trollop::Parser.new do
      opt :no_offsite_links, 'Do not fetch offsite links'
      opt :youtube_dl, 'Use youtube-dl on grabbed pages'
      opt :ignore_sets, 'Ignore sets to apply', :type => :string
      opt :pipeline, 'Run job on this pipeline', :type => :string
      opt :user_agent_alias, 'Use this user agent for the job', :type => :string
      opt :explain, 'Short note explaining archive purpose', :type => :string
      opt :delay, 'inter-request delay, in milliseconds', :type => :integer
      opt :concurrency, 'number of workers', :type => :integer
      opt 
    
  def parse(str)
    begin
      args = Shellwords.split((str || '')).map do |a|
        b=a.split('=')
        b[0] = (case b[0]
               when '--ignoresets','--ignore_sets','--ignoreset','--ignore-set','--ignore_set','--ig-set','--igset' then '--ignore-sets'
               when '--nooffsitelinks','--no-offsite','--nooffsite' then '--no-offsite-links'
               when '--useragentalias','--user-agent','--useragent' then '--user-agent-alias'
               when '--concurrent' then '--concurrency'
               when '--reason' then '--explain'
               else b[0]
               end)
        b.join('=')
      end
      @parser.parse(args).tap do |h|
        if h[:ignore_sets]
          h[:ignore_sets] = h[:ignore_sets].split(',')
        end
      end