class HTMLProofer::Cache

def parsed_timeframe(timeframe)
  return if timeframe.nil?
  time, date = timeframe.match(/(\d+)(\D)/).captures
  time = time.to_i
  case date
  when "M"
    time_ago(time, :months)
  when "w"
    time_ago(time, :weeks)
  when "d"
    time_ago(time, :days)
  when "h"
    time_ago(time, :hours)
  else
    raise ArgumentError, "#{date} is not a valid timeframe!"
  end
end