Implement `macro' recipe keyword

lib/producer/core/recipe/dsl.rb

@@ -34,8 +34,14 @@ module Producer
           env.target = hostname
         end
 
-        def task(name, &block)
-          @tasks << Task.evaluate(name, env, &block)
+        def task(name, *args, &block)
+          @tasks << Task.evaluate(name, env, *args, &block)
+        end
+
+        def macro(name, &block)
+          define_singleton_method(name) do |*args|
+            task("#{name}", *args, &block)
+          end
         end
       end
     end

lib/producer/core/task.rb

@@ -2,9 +2,9 @@ module Producer
   module Core
     class Task
       class << self
-        def evaluate(name, env, &block)
+        def evaluate(name, env, *args, &block)
           dsl = DSL.new(&block)
-          dsl.evaluate(env)
+          dsl.evaluate(env, *args)
           Task.new(name, dsl.actions, dsl.condition)
         end
       end

lib/producer/core/task/dsl.rb

@@ -23,9 +23,9 @@ module Producer
           @condition  = true
         end
 
-        def evaluate(env)
+        def evaluate(env, *args)
           @env = env
-          instance_eval &@block
+          instance_exec *args, &@block
         end
 
         def condition(&block)