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)
  json = File.read(last_run_path)
  return nil if json.strip.empty?
  JSON.parse(json, symbolize_names: true)
end

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