Add feature toggle for countries

README.markdown

@@ -183,6 +183,18 @@ c.in_eu? # => false
 
 ## Currencies
 
+To enable currencies extension please add the following to countries initializer.
+
+``` ruby
+ISO3166.configuration.enable_currency_extension!
+```
+
+Please note that it requires you to add "money" dependency to your gemfile.
+
+``` ruby
+gem "money", "~> 6.9"
+```
+
 **WARNING** if you have a top level class named `Money` you will conflict with this gem.  If this is a large issue we will add a feature to turn currency features off.
 
 Countries now uses the [Money](https://github.com/RubyMoney/money) gem. What this means is you now get back a Money::Currency object that gives you access to all the currency information.

countries.gemspec

@@ -17,7 +17,7 @@ Gem::Specification.new do |gem|
   gem.license       = 'MIT'
 
   gem.add_dependency('i18n_data', '~> 0.8.0')
-  gem.add_dependency('money', '~> 6.9')
+  gem.add_dependency('i18n', '~> 1.0.1')
   gem.add_dependency('unicode_utils', '~> 1.4')
   gem.add_dependency('sixarm_ruby_unaccent', '~> 1.1')
   gem.add_development_dependency('rspec', '>= 3')

lib/countries/configuration.rb

@@ -24,6 +24,11 @@ def initialize
       @loaded_locales = []
     end
 
+    def enable_currency_extension!
+      require 'countries/country/currency_methods'
+      ISO3166::Country.prepend(ISO3166::CountryCurrencyMethods)
+    end
+
     private
 
     def default_locales

lib/countries/country.rb

@@ -47,10 +47,6 @@ def <=>(other)
       to_s <=> other.to_s
     end
 
-    def currency
-      Money::Currency.find(data['currency_code'])
-    end
-
     def start_of_week
       data['start_of_week']
     end

lib/countries/country/currency_methods.rb

@@ -0,0 +1,10 @@
+require 'money'
+
+module ISO3166
+  # Optional extension which allows you to get back a Money::Currency object with all the currency info
+  module CountryCurrencyMethods
+    def currency
+      Money::Currency.find(data['currency_code'])
+    end
+  end
+end

lib/countries/iso3166.rb

@@ -1,6 +1,7 @@
 require 'yaml'
+require 'json'
 require 'i18n_data'
-require 'money'
+require 'i18n'
 
 require 'countries/kwarg_struct'
 require 'countries/configuration'

spec/00_global_spec.rb

@@ -0,0 +1,56 @@
+describe 'global Country class', order: :defined do
+  context "when loaded via 'iso3166' existence" do
+    subject { defined?(Country) }
+
+    it { is_expected.to be_falsey }
+  end
+
+  context "when loaded via 'global'" do
+    before { require 'countries/global' }
+
+    it 'does not pollute global namespace with Money gem' do
+      expect(defined?(Money)).not_to be
+      expect(ISO3166::Country.new('DE').respond_to?(:currency)).not_to be
+    end
+
+    describe 'existence' do
+      subject { defined?(Country) }
+
+      it { is_expected.to be_truthy }
+    end
+
+    describe 'superclass' do
+      subject { Country.superclass }
+
+      it { is_expected.to eq(ISO3166::Country) }
+    end
+
+    describe 'to_s' do
+      it 'should return the country name' do
+        expect(Country.new('GB').to_s).to eq('United Kingdom of Great Britain and Northern Ireland')
+      end
+    end
+
+    describe 'currency' do
+      it { expect(Country.new('GB').respond_to?(:currency)).not_to be }
+
+      context 'I enable currency extension via config' do
+        before { ISO3166.configuration.enable_currency_extension! }
+
+        it 'should add currency to global country' do
+          expect(Country.new('GB').currency).to be
+        end
+      end
+    end
+
+    context 'I enable currency extension via config' do
+      before { ISO3166.configuration.enable_currency_extension! }
+
+      it 'should add currency to global country' do
+        expect(Country.new('GB').currency).to be
+        expect(defined?(Money)).to be
+        expect(ISO3166::Country.new('DE').currency).to be
+      end
+    end
+  end
+end

spec/country_spec.rb

@@ -3,6 +3,7 @@
 require 'spec_helper'
 NUM_OF_COUNTRIES = 249
 describe ISO3166::Country do
+  before { ISO3166.configuration.enable_currency_extension! }
   let(:country) { ISO3166::Country.search('US') }
 
   it 'allows to create a country object from a symbol representation of the alpha2 code' do