smart_truncate.rb

# converts the number to a truncated number
# typically used for display of currency values
def smart_truncate(num)
  return '--' if num.nil?

  display_val = case
  when num.abs > 999999: # 999,999 - round to 'X.YY M'
    "%.#{2}f M" % (num / 1000000)
  when num.abs > 999: # 999 - round to an integer
    number_with_delimiter(number_with_precision(num, 0))
  else
    number_with_delimiter(number_with_precision(num, 2))
  end.sub(/([0-9])\.?0+ /, '\1 ' )

  return display_val
  rescue
     'Error'
end