begin
  require 'rspec/autotest'
rescue LoadError
  require 'autotest'

  # Derived from the `Autotest` class, extends the `autotest` command to work
  # with RSpec.
  #
  # @note this will be extracted to a separate gem when we release rspec-3.
  class Autotest::Rspec2 < Autotest

    RSPEC_EXECUTABLE = File.expand_path('../../../exe/rspec', __FILE__)

    def initialize
      super()
      clear_mappings
      setup_rspec_project_mappings

      # Example for Ruby 1.8: http://rubular.com/r/AOXNVDrZpx
      # Example for Ruby 1.9: http://rubular.com/r/85ag5AZ2jP
      self.failed_results_re = /^\s*\d+\).*\n\s+(?:\e\[\d*m)?Failure.*(\n(?:\e\[\d*m)?\s+#\s(.*)?:\d+(?::.*)?(?:\e\[\d*m)?)+$/m
      self.completed_re = /\n(?:\e\[\d*m)?\d* examples?/m
    end

    # Adds conventional spec-to-file mappings to Autotest configuation.
    def setup_rspec_project_mappings
      add_mapping(%r%^spec/.*_spec\.rb$%) { |filename, _|
        filename
      }
      add_mapping(%r%^lib/(.*)\.rb$%) { |_, m|
        ["spec/#{m[1]}_spec.rb"]
      }
      add_mapping(%r%^spec/(spec_helper|shared/.*)\.rb$%) {
        files_matching %r%^spec/.*_spec\.rb$%
      }
    end

    # Overrides Autotest's implementation to read rspec output
    def consolidate_failures(failed)
      filters = new_hash_of_arrays
      failed.each do |spec, trace|
        if trace =~ /(.*spec\.rb)/
          filters[$1] << spec
        end
      end
      return filters
    end

    # Overrides Autotest's implementation to generate the rspec command to run
    def make_test_cmd(files_to_test)
      files_to_test.empty? ? '' :
        %|#{prefix}"#{ruby}"#{suffix} -S "#{RSPEC_EXECUTABLE}" --tty #{normalize(files_to_test).keys.flatten.map { |f| %|"#{f}"|}.join(' ')}|
    end

    # Generates a map of filenames to Arrays for Autotest
    def normalize(files_to_test)
      files_to_test.keys.inject({}) do |result, filename|
        result.merge!(File.expand_path(filename) => [])
      end
    end

    private

    def suffix
      using_bundler? ? "" : defined?(:Gem) ? " -rrubygems" : ""
    end

    def using_bundler?
      prefix =~ /bundle exec/
    end

    def gemfile?
      File.exist?('./Gemfile')
    end
  end
  Autotest.add_hook(:ran_command) { warn "\n\e[31mrspec-core's built in autotest support is deprecated and will be removed in RSpec 3. Please switch to the rspec-autotest gem.\e[0m" }
end
