Implement Worker class:

* Move recipe processing code in the worker;
* Refactor CLI and use the the worker;
* Implement Recipe#tasks and remove tasks application during evaluation,
  tasks are now applied by the worker after all evaluations are done.

lib/producer/core/cli.rb

@@ -12,16 +12,6 @@ module Producer
 
       def run!
         check_arguments!
-        evaluate_recipe_file
-      end
-
-      def check_arguments!
-        print_usage_and_exit(64) unless @arguments.length == 1
-      end
-
-      def evaluate_recipe_file
-        recipe = Recipe.from_file(@arguments.first)
-        env = Env.new(recipe)
         begin
           recipe.evaluate env
         rescue RecipeEvaluationError => e
@@ -31,6 +21,23 @@ module Producer
 
           exit 70
         end
+        worker.process recipe.tasks
+      end
+
+      def check_arguments!
+        print_usage_and_exit(64) unless @arguments.length == 1
+      end
+
+      def env
+        @env ||= Env.new(recipe)
+      end
+
+      def recipe
+        @recipe ||= Recipe.from_file(@arguments.first)
+      end
+
+      def worker
+        @worker ||= Worker.new
       end
 
       private

lib/producer/core/recipe.rb

@@ -1,7 +1,7 @@
 module Producer
   module Core
     class Recipe
-      attr_reader :code, :filepath
+      attr_reader :code, :filepath, :tasks
 
       def self.from_file(filepath)
         new(File.read(filepath), filepath)
@@ -10,11 +10,13 @@ module Producer
       def initialize(code, filepath = nil)
         @code     = code
         @filepath = filepath
+        @tasks    = []
       end
 
       def evaluate(env)
         dsl = DSL.new(@code).evaluate(env)
         dsl.tasks.map { |e| e.evaluate env }
+        @tasks = dsl.tasks
       end
     end
   end

lib/producer/core/task.rb

@@ -1,17 +1,18 @@
 module Producer
   module Core
     class Task
-      attr_reader :name
+      attr_reader :name, :actions
 
       def initialize(name, &block)
-        @name   = name
-        @block  = block
+        @name     = name
+        @block    = block
+        @actions  = []
       end
 
       def evaluate(env)
         dsl = DSL.new(&@block)
         dsl.evaluate(env)
-        dsl.actions.map(&:apply)
+        @actions = dsl.actions
       end
     end
   end

lib/producer/core/worker.rb

@@ -0,0 +1,13 @@
+module Producer
+  module Core
+    class Worker
+      def process(tasks)
+        tasks.each { |t| process_task t }
+      end
+
+      def process_task(task)
+        task.actions.each(&:apply)
+      end
+    end
+  end
+end