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: log_merger.rb
    path of file: ./repos/roma/lib/roma/tools
    
    the code of the file until where you have to start completion: #!/usr/bin/env ruby
require 'optparse'

class ReadLog
  def initialize(fn)
    @f = open(fn)
    @buff = ''
    @prev = @f.gets
    @s_date = ''
  end

  def read_line
    begin
      if 
    
  def match_line(l)
    if /^[TDIWEFU],\s\[(\d{4})\-(\d{2})\-(\d{2})T(\d{2}):(\d{2}):(\d{2})\.(\d+)\s#\d+\].+/ =~ l then
      @s_date = $1 << $2 << $3 << $4 << $5 << $6 << $7
      true
    else
      @s_date = nil
      false
    end