printBoxed method
printEnd: 如果打印rsp同时又打印rspBody, 那么rsp无需 printEnd 分割线
Implementation
StringBuffer? printBoxed({
String? header,
String? text,
bool printEnd = false,
bool buffOnly = false,
}) {
final buff = StringBuffer(
'╔╣ $header \n'
'$text \n'
'${printEnd ? genLine('\t ╚') : ''}',
);
if (!buffOnly) _emitText(buff.toString());
return buffOnly ? buff : null;
}