Implement `get' task keyword, fetch from registry

features/tasks/registry.feature

@@ -0,0 +1,13 @@
+Feature: access to registry from task DSL
+
+  Scenario: `get' keyword fetches a value from the registry
+    Given a recipe with:
+      """
+      set :some_key, 'some_value'
+
+      task :output_some_key do
+        echo get :some_key
+      end
+      """
+    When I successfully execute the recipe
+    Then the output must contain "some_value"

lib/producer/core/task/dsl.rb

@@ -37,6 +37,10 @@ module Producer
         def ask(question, choices, prompter: Prompter)
           prompter.new(env.input, env.output).prompt(question, choices)
         end
+
+        def get(key)
+          env[key]
+        end
       end
     end
   end

spec/producer/core/task/dsl_spec.rb

@@ -102,5 +102,13 @@ module Producer::Core
         expect(ask).to eq :choice
       end
     end
+
+    describe '#get' do
+      let(:env) { Env.new(registry: { some_key: :some_value }) }
+
+      it 'fetches a value from the registry at given index' do
+        expect(dsl.get :some_key).to eq :some_value
+      end
+    end
   end
 end