Implement `set' task keyword

features/recipe/registry.feature

@@ -57,6 +57,17 @@ Feature: key/value registry
     When I successfully execute the recipe
     Then the output must contain "some_value"
 
+  Scenario: `set' keyword sets a value from a task
+    Given a recipe with:
+      """
+      task :registry_testing do
+        set :some_key, 'some_value'
+        echo get :some_key
+      end
+      """
+    When I successfully execute the recipe
+    Then the output must contain "some_value"
+
   Scenario: `set?' keyword tests wether given key is defined
     Given a recipe with:
       """

lib/producer/core/task.rb

@@ -16,6 +16,7 @@ module Producer
       extend Forwardable
       def_delegators  :@name, :to_s
       def_delegators  :@env,  :target
+      def_delegator   :@env,  :[]=, :set
       def_delegator   :@env,  :[], :get
       def_delegator   :@env,  :key?, :set?
       def_delegator   :@env,  :recipe_argv

spec/producer/core/task_spec.rb

@@ -152,6 +152,13 @@ module Producer::Core
       end
     end
 
+    describe '#set' do
+      it 'sets a value in the registry' do
+        task.set :some_key, :some_value
+        expect(task.get :some_key).to eq :some_value
+      end
+    end
+
     describe '#get' do
       before { env[:some_key] = :some_value }