getCursorPosition method

ConsoleCoordinate getCursorPosition([ bool flush = false ])

Implementation

ConsoleCoordinate getCursorPosition([bool flush = false]) {
  final bool prevLineMode = _stdin.lineMode;
  try {
    _stdin.echoMode = false;
    _stdin.lineMode = false;

    _stdout.write(ConsoleStrings.deviceStatusReport);

    final yBytes = <int>[];
    final xBytes = <int>[];
    int counter = 0;
    bool readY = false;
    bool readX = false;

    // Parsing the response which is in "ESC[y;xR" format
    while (counter < 32) {
      final char = _stdin.readByteSync();

      if (char == -1) {
        break; // EOF
      }

      if (readX) {
        if (char == 82) {
          // found "R"
          break;
        }
        xBytes.add(char);
      } else if (readY) {
        if (char == 59) {
          // found ";"
          readX = true;
          continue;
        }
        yBytes.add(char);
      } else if (char == 91) {
        // found "["
        readY = true;
      }

      counter++;
    }

    final int? x = int.tryParse(String.fromCharCodes(xBytes));
    final int? y = int.tryParse(String.fromCharCodes(yBytes));

    if (x == null || y == null) {
      throw Exception(
        'Unexpected cursor position report: ${String.fromCharCodes(yBytes)};${String.fromCharCodes(xBytes)}',
      );
    }

    return ConsoleCoordinate(x, y);
  } catch (e) {
    rethrow;
  } finally {
    _stdin.echoMode = true;
    _stdin.lineMode = prevLineMode;
  }
}