Method is_opened

src/npp/NppInterface.cpp:118–121

bool NppInterface::open_document(std::wstring filename) { return send_msg_to_npp(NPPM_DOOPEN, 0, reinterpret_cast<LPARAM>(filename.data())) == TRUE; }

bool NppInterface::is_opened(const std::wstring &filename) const {
  auto filenames = get_open_filenames();
  return std::find(filenames.begin(), filenames.end(), filename) != filenames.end();
}

EditorCodepage NppInterface::get_encoding() const {
  auto CodepageId = static_cast<int>(send_msg_to_scintilla(SCI_GETCODEPAGE, 0, 0));