Support custom formatter on RSpec3

lib/rspec/core/formatters/turnip_formatter.rb

@@ -7,6 +7,7 @@
 require 'turnip_formatter/printer/index'
 require 'turnip_formatter/printer/scenario'
 require_relative './turnip_formatter/for_rspec2'
+require_relative './turnip_formatter/for_rspec3'
 
 module RSpec
   module Core
@@ -16,7 +17,12 @@ class TurnipFormatter < BaseFormatter
 
         SCENARIO_TEMPORARY_OUTPUT_DIR = File.expand_path('./turnip_tmp')
 
-        include TurnipFormatter::ForRSpec2
+        if Formatters.respond_to?(:register)
+          include TurnipFormatter::ForRSpec3
+          Formatters.register self, :example_passed, :example_pending, :example_failed, :dump_summary
+        else
+          include TurnipFormatter::ForRSpec2
+        end
 
         def initialize(output)
           super(output)

lib/rspec/core/formatters/turnip_formatter/for_rspec3.rb

@@ -0,0 +1,48 @@
+# -*- coding: utf-8 -*-
+
+module RSpec
+  module Core
+    module Formatters
+      class TurnipFormatter < BaseFormatter
+        module ForRSpec3
+          def dump_summary(summary)
+            print_params = {
+              scenarios:      scenarios,
+              failed_count:   summary.failure_count,
+              pending_count:  summary.pending_count,
+              total_time:     summary.duration,
+              scenario_files: scenario_output_files
+            }
+            output_html(print_params)
+          end
+
+          def example_passed(notification)
+            scenario = ::TurnipFormatter::Scenario::Pass.new(notification.example)
+            output_scenario(scenario)
+          end
+
+          def example_pending(notification)
+            clean_backtrace(notification)
+            scenario = ::TurnipFormatter::Scenario::Pending.new(notification.example)
+            output_scenario(scenario)
+          end
+
+          def example_failed(notification)
+            clean_backtrace(notification)
+            scenario = ::TurnipFormatter::Scenario::Failure.new(notification.example)
+            output_scenario(scenario)
+          end
+
+          private
+
+          def clean_backtrace(notification)
+            if notification.respond_to?(:formatted_backtrace)
+              formatted = notification.formatted_backtrace
+              notification.example.exception.set_backtrace(formatted)
+            end
+          end
+        end
+      end
+    end
+  end
+end