module ParallelTests

def self.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.exists?(filename)
    current, previous = File.expand_path("..", current), current
  end
  false
end

def self.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 self.parse_rake_args(args)
  # order as given by user
  args = [args[:count], args[:pattern], args[:options]]
  # count given or empty ?
  # parallel:spec[2,models,options]
  # parallel:spec[,models,options]
  count = args.shift if args.first.to_s =~ /^\d*$/
  num_processes = count.to_i unless count.to_s.empty?
  pattern = args.shift
  options = args.shift
  [num_processes, pattern.to_s, options.to_s]
end