rExecute function
Run the R code and append to the rattle script.
Implementation
void rExecute(WidgetRef ref, String code) {
debugPrint('R EXECUTE\t$code');
// Add the code to the script provider so it will be displayed in the script
// tab.
updateScript(
ref,
"\n${'#' * 72}\n## -- Extra Code --\n${'#' * 72}\n"
'\n$code\n',
);
ref.read(ptyProvider).write(const Utf8Encoder().convert('$code\n'));
}