Ticket #11149: format_option_for_number_to_currency

Index: test/template/number_helper_test.rb
===================================================================
--- test/template/number_helper_test.rb (revision 8894)
+++ test/template/number_helper_test.rb (working copy)
@@ -25,6 +25,7 @@
     assert_equal("$1,234,567,890.5", number_to_currency(1234567890.50, {:precision => 1}))
     assert_equal("£1234567890,50", number_to_currency(1234567890.50, {:unit => "£", :separator => ",", :delimiter => ""}))
     assert_equal("$1,234,567,890.50", number_to_currency("1234567890.50"))
+    assert_equal("1,234,567,890.50 Kč", number_to_currency("1234567890.50", {:unit => "Kč", :format => "%n %u"}))
     assert_equal("$x.", number_to_currency("x"))
     assert_nil number_to_currency(nil)
   end
Index: lib/action_view/helpers/number_helper.rb
===================================================================
--- lib/action_view/helpers/number_helper.rb    (revision 8894)
+++ lib/action_view/helpers/number_helper.rb    (working copy)
@@ -54,7 +54,11 @@
       # * <tt>:unit</tt>  - Sets the denomination of the currency (defaults to "$").
       # * <tt>:separator</tt>  - Sets the separator between the units (defaults to ".").
       # * <tt>:delimiter</tt>  - Sets the thousands delimiter (defaults to ",").
+      # * <tt>:format</tt>  - Sets the format of the output string (defaults to "%u%n"). The field types are:
       #
+      #     %u  The currency unit
+      #     %n  The number
+      #
       # ==== Examples
       #  number_to_currency(1234567890.50)                    # => $1,234,567,890.50
       #  number_to_currency(1234567890.506)                   # => $1,234,567,890.51
@@ -62,16 +66,19 @@
       #
       #  number_to_currency(1234567890.50, :unit => "&pound;", :separator => ",", :delimiter => "")
       #  # => &pound;1234567890,50
+      #  number_to_currency(1234567890.50, :unit => "&pound;", :separator => ",", :delimiter => "", :format => "%n %u")
+      #  # => 1234567890,50 &pound;
       def number_to_currency(number, options = {})
         options   = options.stringify_keys
         precision = options["precision"] || 2
         unit      = options["unit"] || "$"
         separator = precision > 0 ? options["separator"] || "." : ""
         delimiter = options["delimiter"] || ","
+        format    = options["format"] || "%u%n"
 
         begin
           parts = number_with_precision(number, precision).split('.')
-          unit + number_with_delimiter(parts[0], delimiter) + separator + parts[1].to_s
+          format.gsub(/%n/, number_with_delimiter(parts[0], delimiter) + separator + parts[1].to_s).gsub(/%u/, unit)
         rescue
           number
         end