Reduce global namespace pollution

lib/xcake.rb

@@ -1,5 +1,4 @@
-require 'xcake/core_ext/array'
-require 'xcake/core_ext/object'
+require 'xcake/core_ext/class'
 require 'xcake/core_ext/string'
 
 require 'xcake/xcode/project'

lib/xcake/core_ext/class.rb

@@ -0,0 +1,14 @@
+module Xcake
+  module CoreExtensions
+    # @example  Including in a class
+    #           Class.send(:include, Xcake::CoreExtensions::ClassDescendants) # done with send because of old ruby versions
+    #
+    module ClassDescendants
+      # Returns all descendants of a class
+      #
+      def descendants
+        ObjectSpace.each_object(singleton_class).select { |klass| klass < self }
+      end
+    end
+  end
+end

lib/xcake/dependency_provider.rb

@@ -7,9 +7,9 @@ class DependencyProvider
     def initialize(dependency_class)
       plugins = dependency_class.load_plugins
 
-      @dependency_graph = plugins.map do |p|
-        [p, p.dependencies]
-      end.to_h
+      @dependency_graph = plugins.each_with_object({}) do |p, hash|
+        hash[p] = p.dependencies
+      end
     end
 
     def tsort_each_node(&block)

lib/xcake/generator.rb

@@ -3,6 +3,7 @@ class Generator
     include Dependency
     include Plugin
     include Visitor
+    Class.send(:include, CoreExtensions::ClassDescendants) # done with send because of old ruby versions
 
     attr_accessor :context
 

spec/core_ext/object_spec.rb → spec/core_ext/class_spec.rb

@@ -1,6 +1,7 @@
 require 'spec_helper'
 
 class Parent
+  Class.send(:include, Xcake::CoreExtensions::ClassDescendants) # done with send because of old ruby versions
 end
 
 class Child < Parent
@@ -9,10 +10,11 @@ class Child < Parent
 class Grandchild < Child
 end
 
-describe Object do
+describe Xcake::CoreExtensions do
   it 'should return all descendants' do
     descendants = Parent.descendants
 
+    expect(descendants.count).to eq(2)
     expect(descendants).to include(Child)
     expect(descendants).to include(Grandchild)
   end