Ability to add units

[ybart]

Hi, in our application, we need to generate words from number including an unit.

I've done the following quick-and-dirty patch which works for us, but would need more work to be included in this gem.

I'm including it here for anyone interested :

module NumbersAndWords
  module Wrappers
    class Float
      ZERO_SYMBOL = '0'.freeze

      attr_accessor :number

      def initialize(number)
        @number = number
      end

      def to_words(options = {})
        @options = options
        words = []
        words << add_unit_to(integral_part_with(options), options)
        words << fractional_part_with(options) unless fractional_part_is_nil?
        NumbersAndWords::WordsArray.new(words).join options
      end

      private

      def add_unit_to(words, options)
        return unless options[:unit]

        i18n_options = { count: number.abs.floor, scope: :numbers }

        words_array = words.split(' ')
        words_array << ::I18n.t(options[:unit], i18n_options)
        words_array.join(' ')
      end
    end
  end
end

Caveats that might need to be addressed for a PR:

• Hard-coded separator.
• Hard coded position.
• Translation scope is hard-coded
• Does not work for integer
• Translation should be moved to the appropriate module
• No tests