lines package:yi-rope

This is like lines' but it does *not* preserve newlines. Specifically, we just strip the newlines from the result of lines'. This behaves slightly differently than the old split: the number of resulting strings here is equal to the number of newline characters in the underlying string. This is much more consistent than the old behaviour which blindly used ByteStrings split and stitched the result back together which was inconsistent with the rest of the interface which worked with number of newlines.

Splits the YiString into a list of YiString each containing a line. Note that in old implementation this allowed an arbitrary character to split on. If you want to do that, manually convert toText and use splitOn to suit your needs. This case is optimised for newlines only which seems to have been the only use of the original function. The newlines are preserved so this should hold:

'toText' . 'concat' . 'lines'' ≡ 'toText'

but the underlying structure might change: notably, chunks will most likely change sizes.

Count the number of newlines in the underlying string. This is actually amortized constant time as we cache this information in the underlying tree.

Joins up lines by a newline character. It does not leave a newline after the last line. If you want a more classical unlines behaviour, use map along with snoc.