def open_list(file)
      f = clean_path_to(file, allow_missing: true)
      if f
        f = File.open(f, 'r')
      elsif File.exist?("#{Origen.root}/list/#{File.basename(file)}")
        f = File.open("#{Origen.root}/list/#{File.basename(file)}", 'r')
      elsif @last_opened_list_dir && File.exist?("#{@last_opened_list_dir}/#{file}")
        f = File.open("#{@last_opened_list_dir}/#{file}", 'r')
      else
        fail "Could not find list file: #{file}"
      end
      lines = f.readlines
      f.close
      # Before we go save the directory of this list, this will help
      # us to resolve any relative path references to other lists that
      # it may contain
      @last_opened_list_dir = clean_path_to(Pathname.new(f).dirname)
      lines
    end
def open_list(file)
      f = clean_path_to(file, allow_missing: true)
      if f
        f = File.open(f, 'r')
      elsif File.exist?("#{Origen.root}/list/#{File.basename(file)}")
        f = File.open("#{Origen.root}/list/#{File.basename(file)}", 'r')
      elsif @last_opened_list_dir && File.exist?("#{@last_opened_list_dir}/#{file}")
        f = File.open("#{@last_opened_list_dir}/#{file}", 'r')
      else
        fail "Could not find list file: #{file}"
      end
      lines = f.readlines
      f.close
      # Before we go save the directory of this list, this will help
      # us to resolve any relative path references to other lists that
      # it may contain
      @last_opened_list_dir = clean_path_to(Pathname.new(f).dirname)
      lines
    end
Returns the contents of the given list file in an array, if it
 can be found, if not will raise an error