Implement Task::DSL#evaluate:

So that the env is available from the task DSL.

lib/producer/core/recipe.rb

@@ -16,7 +16,7 @@ module Producer
 
       def evaluate(env)
         dsl = DSL.new(@code).evaluate(env)
-        dsl.tasks.map(&:evaluate)
+        dsl.tasks.map { |e| e.evaluate env }
       end
     end
   end

lib/producer/core/task.rb

@@ -8,8 +8,8 @@ module Producer
         @block  = block
       end
 
-      def evaluate
-        DSL.new &@block
+      def evaluate(env)
+        DSL.new(&@block).evaluate(env)
       end
     end
   end

lib/producer/core/task/dsl.rb

@@ -5,7 +5,11 @@ module Producer
         ConditionNotMetError = Class.new(StandardError)
 
         def initialize(&block)
-          instance_eval &block
+          @block = block
+        end
+
+        def evaluate(env)
+          instance_eval &@block
         rescue ConditionNotMetError
         end