Function lastWriteTime

src/utils.cc:146–151

}

std::optional<int64_t> lastWriteTime(const std::string &path) {
  sys::fs::file_status status;
  if (sys::fs::status(path, status))
    return {};
  return sys::toTimeT(status.getLastModificationTime());
}

std::optional<std::string> readContent(const std::string &filename) {
  char buf[4096];