Currency Format - Convierte un número a formato de moneda, con símbolo y delimitadores

currency_format.rb

def currency_format(number, options={})
  options = {:currency_symbol => "$", :delimiter => ".", :decimal_symbol => ",", :currency_before => true, :no_decimal => true}.merge(options)
  
  # split integer and fractional parts 
  int, frac = ("%.2f" % number).split('.')
  # insert the delimiters
  int.gsub!(/(\d)(?=(\d\d\d)+(?!\d))/, "\\1#{options[:delimiter]}")

  if options[:no_decimal]
    frac_part = ""
  else
    frac_part = options[:decimal_symbol] + frac
  end
  
  if options[:currency_before]
    options[:currency_symbol] + int + frac_part
  else
    int + frac_part + options[:currency_symbol]
  end
end