Implement nested tasks

lib/producer/core/task.rb

@@ -43,6 +43,10 @@ module Producer
         @condition
       end
 
+      def task(name, *args, &block)
+        @actions << self.class.evaluate(@env, name, *args, &block)
+      end
+
       def ask(question, choices, prompter: Prompter.new(@env.input, @env.output))
         prompter.prompt(question, choices)
       end

lib/producer/core/worker.rb

@@ -18,8 +18,12 @@ module Producer
         if task.condition_met?
           @env.log "Task: `#{task}' applying..."
           task.actions.each do |e|
-            @env.log " action: #{e}"
-            e.apply unless @env.dry_run?
+            case e
+            when Task then process_task e
+            else
+              @env.log " action: #{e}"
+              e.apply unless @env.dry_run?
+            end
           end
         else
           @env.log "Task: `#{task}' skipped"