Function parse_duration

src/ccache/util/string.cpp:316–359

}

tl::expected<std::chrono::milliseconds, std::string>
parse_duration(std::string_view duration)
{
  if (duration.empty()) {
    return tl::unexpected("invalid empty duration: \"\"");
  }

  uint64_t factor_ms = 0;
  size_t suffix_len = 1;
  char last_ch = duration.back();

  // Check for two-character suffix "ms"
  if (duration.length() >= 2 && last_ch == 's'
      && duration[duration.length() - 2] == 'm') {
    factor_ms = 1;
    suffix_len = 2;
  } else {
    // Single-character suffixes
    switch (last_ch) {
    case 's':
      factor_ms = 1000;
      break;
    case 'm':
      factor_ms = 60 * 1000;
      break;
    case 'h':
      factor_ms = 60 * 60 * 1000;
      break;
    case 'd':
      factor_ms = 24 * 60 * 60 * 1000;
      break;
    default:
      return tl::unexpected(
        FMT("invalid suffix (supported: ms (millisecond), s (second), m "
            "(minute), h (hour), d (day)): \"{}\"",
            duration));
    }
  }

  TRY_ASSIGN(
    auto value,
    parse_unsigned(duration.substr(0, duration.length() - suffix_len)));
  return std::chrono::milliseconds(factor_ms * value);
}

tl::expected<int64_t, std::string>
parse_signed(std::string_view value,