module ParallelTests

def bundler_enabled?
  return true if Object.const_defined?(:Bundler)
  previous = nil
  current = File.expand_path(Dir.pwd)
  until !File.directory?(current) || current == previous
    filename = File.join(current, "Gemfile")
    return true if File.exist?(filename)
    current, previous = File.expand_path("..", current), current
  end
  false
end

def delta
  before = now.to_f
  yield
  now.to_f - before
end

def determine_number_of_processes(count)
  [
    count,
    ENV["PARALLEL_TEST_PROCESSORS"],
    Parallel.processor_count
  ].detect{|c| not c.to_s.strip.empty? }.to_i
end

def first_process?
  ENV["TEST_ENV_NUMBER"].to_i <= 1
end

def now
  if Time.respond_to?(:now_without_mock_time) # Timecop
    Time.now_without_mock_time
  else
    Time.now
  end
end

def number_of_running_processes
  result = `#{GREP_PROCESSES_COMMAND}`
  raise "Could not grep for processes -> #{result}" if result.strip != "" && !$?.success?
  result.split("\n").size
end

def parent_pid
  if WINDOWS
    `wmic process where (processid=#{Process.pid}) get parentprocessid`
  else
    `ps -o ppid= -p#{`ps -o ppid= -p#{Process.pid}`}` #the true parent is one layer up.
  end.to_i
end

def wait_for_other_processes_to_finish
  return unless ENV["TEST_ENV_NUMBER"]
  sleep 1 until number_of_running_processes <= 1
end