wait_for.rb

module TimeUtils

  def self.wait_for(title: '', max_wait_time: 5, wait_interval: 0.1,
      raise_timeout_error: false,
      debug: false,
      &block)

    puts "Waiting for  #{title}" if debug

    waiting_time = 0
    loop do

      if yield
        puts 'Success' if debug
        return
      end

      puts("Sleepping #{wait_interval}..") if debug
      sleep(wait_interval)
      waiting_time += wait_interval

      if waiting_time > max_wait_time
        puts "Timeout"
        raise Timeout::Error if raise_timeout_error
        break
      end
    end
  end

  def self.wait_for_file(filename, **wait_options)
    wait_for(**(wait_options.merge(title: "file #{filename}"))) do
      File.exist?(filename)
    end
  end
end


puts 'Waiting routine example.'

TimeUtils.wait_for_file 'sample.pdf', debug: true

# You can enter `echo test > sample.pdf` in separate console to test sucessful result.