rspec formatter for vim :make

spec_vim_formatter.rb

class VimFormatter
  RSpec::Core::Formatters.register self, :example_failed, :example_passed, :dump_summary

  def initialize(output)
    @output = output
  end

  def example_passed(n)
    @output << "PASSED: " << n.example.description << "\n\n"
  end

  def example_failed(notification)
    @output << format(notification) + "\n\n"
  end

  def dump_summary(n)
    passed = n.example_count
    failed = n.failure_count
    total = passed + failed
    @output << "{passed: #{passed}, failed: #{failed}, total: #{total}, duration: #{n.duration.round(3)}}"
  end

  private

  def format(n)
    [
      "FAILED: " << n.description,
      "%s: %s" % [n.example.location, n.exception.message],
      n.formatted_backtrace.join("\n").gsub(':', '!'),
    ].join("\n")
  end
end