module SimpleCov::LastRun

def last_run_path
  File.join(SimpleCov.coverage_path, '.last_run.json')
end

def read
  return nil unless File.exist?(last_run_path)
  SimpleCov::JSON.parse(File.read(last_run_path))
end

def write(json)
  File.open(last_run_path, "w+") do |f|
    f.puts SimpleCov::JSON.dump(json)
  end
end