Function formatCommandLine

src/env.cpp:686–733

}

QString formatCommandLine(const QFileInfo& targetInfo, const QString& cmd)
{
  // yeah, FormatMessage() expects at least as many arguments as there are
  // placeholders and while the command for associations should typically only
  // have %1, the user can actually enter anything in the registry
  //
  // since the maximum number of arguments is 99, this creates an array of 99
  // wchar_* where the first one (%1) points to the filename and the remaining
  // 98 to ""
  //
  // FormatMessage() actually takes a va_list* for the arguments, but by passing
  // FORMAT_MESSAGE_ARGUMENT_ARRAY, an array of DWORD_PTR can be given instead

  // 99 arguments
  std::array<DWORD_PTR, 99> args;

  // first one is the filename
  const auto wpath = targetInfo.absoluteFilePath().toStdWString();
  args[0]          = reinterpret_cast<DWORD_PTR>(wpath.c_str());

  // remaining are ""
  std::fill(args.begin() + 1, args.end(), reinterpret_cast<DWORD_PTR>(L""));

  // must be freed with LocalFree()
  wchar_t* buffer = nullptr;

  const auto wcmd = cmd.toStdWString();

  const auto n =
      ::FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_ARGUMENT_ARRAY |
                           FORMAT_MESSAGE_FROM_STRING,
                       wcmd.c_str(), 0, 0, reinterpret_cast<LPWSTR>(&buffer), 0,
                       reinterpret_cast<va_list*>(&args[0]));

  if (n == 0 || !buffer) {
    const auto e = GetLastError();

    log::error("failed to format command line '{}' with path '{}', {}", cmd,
               targetInfo.absoluteFilePath(), formatSystemMessage(e));

    return {};
  }

  auto s = QString::fromWCharArray(buffer, n);
  ::LocalFree(buffer);

  return s.trimmed();
}

std::pair<QString, QString> splitExeAndArguments(const QString& cmd)
{