# File lib/liquid/standardfilters.rb, line 41
    def truncate(input, length = 50, truncate_string = "...")
      if input.nil? then return end
      l = length.to_i - truncate_string.length
      l = 0 if l < 0
      input.length > length.to_i ? input[0...l] + truncate_string : input
    end