Indent logging output on nested tasks

features/task_nested_tasks.feature

@@ -13,3 +13,8 @@ Feature: nested tasks
     Scenario: applies nested tasks
       When I successfully execute the recipe
       Then the output must match /\AOK/
+
+    Scenario: indents logging from nested tasks
+      When I successfully execute the recipe with option -v
+      Then the output must match /^  Task:.+/
+      And the output must match /^   action:.+/

lib/producer/core/worker.rb

@@ -14,21 +14,29 @@ module Producer
         tasks.each { |t| process_task t }
       end
 
-      def process_task(task)
+      def process_task(task, indent_level = 0)
         if task.condition_met?
-          @env.log "Task: `#{task}' applying..."
+          log "Task: `#{task}' applying...", indent_level
           task.actions.each do |e|
             case e
-            when Task then process_task e
+            when Task then process_task e, indent_level + 2
             else
-              @env.log " action: #{e}"
+              log " action: #{e}", indent_level
               e.apply unless @env.dry_run?
             end
           end
         else
-          @env.log "Task: `#{task}' skipped"
+          log "Task: `#{task}' skipped", indent_level
         end
       end
+
+
+      private
+
+      def log(message, indent_level)
+        message = [' ' * indent_level, message].join
+        @env.log message
+      end
     end
   end
 end