Function QueryWindowsRegistry

Source/cmCMakeHostSystemInformationCommand.cxx:629–713

template <typename Range>
bool QueryWindowsRegistry(Range args, cmExecutionStatus& status,
                          std::string const& variable)
{
  using View = cmWindowsRegistry::View;
  if (args.empty()) {
    status.SetError("missing <key> specification.");
    return false;
  }
  std::string const& key = *args.begin();

  struct Arguments : public ArgumentParser::ParseResult
  {
    std::string ValueName;
    bool ValueNames = false;
    bool SubKeys = false;
    std::string View;
    std::string Separator;
    std::string ErrorVariable;
  };
  cmArgumentParser<Arguments> parser;
  parser.Bind("VALUE"_s, &Arguments::ValueName)
    .Bind("VALUE_NAMES"_s, &Arguments::ValueNames)
    .Bind("SUBKEYS"_s, &Arguments::SubKeys)
    .Bind("VIEW"_s, &Arguments::View)
    .Bind("SEPARATOR"_s, &Arguments::Separator)
    .Bind("ERROR_VARIABLE"_s, &Arguments::ErrorVariable);
  std::vector<std::string> invalidArgs;

  Arguments const arguments = parser.Parse(args.advance(1), &invalidArgs);
  if (!invalidArgs.empty()) {
    status.SetError(cmStrCat("given invalid argument(s) \"",
                             cmJoin(invalidArgs, ", "_s), "\"."));
    return false;
  }
  if (arguments.MaybeReportError(status.GetMakefile())) {
    return true;
  }
  if ((!arguments.ValueName.empty() &&
       (arguments.ValueNames || arguments.SubKeys)) ||
      (arguments.ValueName.empty() && arguments.ValueNames &&
       arguments.SubKeys)) {
    status.SetError("given mutually exclusive sub-options VALUE, "
                    "VALUE_NAMES or SUBKEYS.");
    return false;
  }

  if (!arguments.View.empty() && !cmWindowsRegistry::ToView(arguments.View)) {
    status.SetError(
      cmStrCat("given invalid value for VIEW: ", arguments.View, '.'));
    return false;
  }

  auto& makefile = status.GetMakefile();

  makefile.AddDefinition(variable, ""_s);

  auto view = arguments.View.empty()
    ? View::Both