splitLineJoin method
Split this String, that is a single long line (maybe without any
linebreaks) into multiple Strings with a maximum length of maxLength.
Linebreaks are assumes to be \n.
The lines are split where a whitespace is. The length of a line may be
more than maxLength, if the long line has no whitespaces that allow it
to be split into multiple lines.
The split lines are joined using separator.
Also see splitLine.
Implementation
String splitLineJoin(int maxLength, [String separator = "\n"]) {
return splitLine(maxLength).join(separator);
}