std::map<std::string, std::set<std::string>> funcs;


CXChildVisitResult visitor(CXCursor cursor, CXCursor, CXClientData) {
  CXCursorKind kind = clang_getCursorKind(cursor);

  if (kind == CXCursorKind::CXCursor_FunctionDecl) {
    std::string _namespace = std::string(clang_getCString(clang_getCursorDisplayName(clang_getCursorSemanticParent(cursor))));
    std::string _function = std::string(clang_getCString(clang_getCursorDisplayName(cursor)));

    funcs[_namespace].emplace(_function);

  }

  return CXChildVisit_Recurse;
}

int main(int argc, char **argv) {
  if (argc < 2) {
    return 1;
  }

  // Command line arguments required for parsing the TU
  constexpr const char *ARGUMENTS[] = {};

  // Create an index with excludeDeclsFromPCH = 1, displayDiagnostics = 0
  CXIndex index = clang_createIndex(1, 0);

  // Speed up parsing by skipping function bodies
  CXTranslationUnit translationUnit = clang_parseTranslationUnit(
      index, argv[1], ARGUMENTS, std::extent<decltype(ARGUMENTS)>::value,
      nullptr, 0, CXTranslationUnit_SkipFunctionBodies);

  // Visit all the nodes in the AST
  CXCursor cursor = clang_getTranslationUnitCursor(translationUnit);
  clang_visitChildren(cursor, visitor, 0);

  // Release memory
  clang_disposeTranslationUnit(translationUnit);
  clang_disposeIndex(index);

  for (auto n : funcs) {
    std::cout << "namespace: " << n.first << std::endl;
    for (auto f : n.second) {
      std::cout << "  " << f << std::endl;
    }
  }

  return 0;
}