module RSpec::Support::Spec

def self.setup_simplecov(&block)
  # Simplecov emits some ruby warnings when loaded, so silence them.
  old_verbose, $VERBOSE = $VERBOSE, false
  return if ENV['NO_COVERAGE'] || RUBY_VERSION < '1.9.3'
  return if RUBY_ENGINE != 'ruby' || RSpec::Support::OS.windows?
  # Don't load it when we're running a single isolated
  # test file rather than the whole suite.
  return if RSpec.configuration.files_to_run.one?
  require 'simplecov'
  start_simplecov(&block)
rescue LoadError
  warn "Simplecov could not be loaded"
ensure
  $VERBOSE = old_verbose
end

def self.start_simplecov(&block)
  SimpleCov.start do
    add_filter "bundle/"
    add_filter "tmp/"
    add_filter do |source_file|
      # Filter out `spec` directory except when it is under `lib`
      # (as is the case in rspec-support)
      source_file.filename.include?('/spec/') && !source_file.filename.include?('/lib/')
    end
    instance_eval(&block) if block
  end
end