Max line length for the formatter

[aminya]

When formatting the code like this, the line lengths become very long. Could you add an option to break these lines according to max line length (e.g. defaulting to 100)?

    "aaaaaaaaaa" -> {"bbbbbbb" "cccccccc" "dddddddd", "eeeeeeee", "ffffffffff", "gggggggggg"};