Add namespaces to YAML sources per rubyconfig#288

lib/config/sources/yaml_source.rb

@@ -6,15 +6,26 @@ module Sources
     class YAMLSource
       attr_accessor :path
 
-      def initialize(path)
+      def initialize(path, namespace = nil)
         @path = path.to_s
+
+        # Make sure @namespace is an array if it exists at all
+        if namespace
+          @namespace = namespace
+          @namespace = [@namespace] unless @namespace.is_a?(Array)
+        end
       end
 
       # returns a config hash from the YML file
       def load
         result = YAML.load(ERB.new(IO.read(@path)).result) if @path and File.exist?(@path)
-
-        result || {}
+        return {} unless result
+        return result unless @namespace
+
+        # Resolves namespacing multiple layers deep 
+        # i.e. ['layer1', 'layer2'] comes out to {'layer1' => {'layer2' => content}}
+        return  result = @namespace.reverse.inject(result) { |a, n| { n => a } }
+
 
         rescue Psych::SyntaxError => e
           raise "YAML syntax error occurred while parsing #{@path}. " \

spec/sources/yaml_source_spec.rb

@@ -25,6 +25,43 @@ module Config::Sources
       end
     end
 
+    context "basic yml file with single namespace" do
+      let(:source) do
+        YAMLSource.new "#{fixture_path}/development.yml", 'test_namespace'
+      end
+
+      it "should properly read the settings" do
+        results = source.load
+        expect(results['test_namespace']["size"]).to eq(2)
+      end
+
+      it "should properly read nested settings" do
+        results = source.load
+        pp results
+        expect(results['test_namespace']["section"]["size"]).to eq(3)
+        expect(results['test_namespace']["section"]["servers"]).to be_instance_of(Array)
+        expect(results['test_namespace']["section"]["servers"].size).to eq(2)
+      end
+    end
+
+    context "basic yml file with nested namespace" do
+      let(:source) do
+        YAMLSource.new "#{fixture_path}/development.yml", ['test_namespace', 'test_layer_2']
+      end
+
+      it "should properly read the settings" do
+        results = source.load
+        expect(results['test_namespace']['test_layer_2']["size"]).to eq(2)
+      end
+
+      it "should properly read nested settings" do
+        results = source.load
+        expect(results['test_namespace']['test_layer_2']["section"]["size"]).to eq(3)
+        expect(results['test_namespace']['test_layer_2']["section"]["servers"]).to be_instance_of(Array)
+        expect(results['test_namespace']['test_layer_2']["section"]["servers"].size).to eq(2)
+      end
+    end
+
     context "yml file with erb tags" do
       let(:source) do
         YAMLSource.new "#{fixture_path}/with_erb.yml"