Add formatting for EUR locales (#1231)

* Add formatting for EUR locales

* Fix formatting assertion for EUR in english locales

lib/money/formatting.rb

@@ -0,0 +1,35 @@
+module Money::Formatting
+  # Fallback formatting.  For advanced formatting, use Rails number_to_currency helper.
+  def format
+    whole_part, fractional_part = sprintf("%.#{currency.default_precision}f", amount).split(".")
+    whole_with_delimiters = whole_part.chars.to_a.reverse.each_slice(3).map(&:join).join(currency.delimiter).reverse
+    formatted_amount = "#{whole_with_delimiters}#{currency.separator}#{fractional_part}"
+
+    currency.default_format.gsub("%n", formatted_amount).gsub("%u", currency.symbol)
+  end
+  alias_method :to_s, :format
+
+  def format_options(locale = nil)
+    local_option_overrides = locale_options(locale)
+
+    {
+      unit: currency.symbol,
+      precision: currency.default_precision,
+      delimiter: currency.delimiter,
+      separator: currency.separator,
+      format: currency.default_format
+    }.merge(local_option_overrides)
+  end
+
+  private
+    def locale_options(locale)
+      case [ currency.iso_code, locale.to_sym ]
+      when [ "EUR", :nl ], [ "EUR", :pt ]
+        { delimiter: ".", separator: ",", format: "%u %n" }
+      when [ "EUR", :en ], [ "EUR", :en_IE ]
+        { delimiter: ",", separator: "." }
+      else
+        {}
+      end
+    end
+end