breakEnd, spanEnd

[Kile-Asmussen]

there is a break and span but no breakEnd or spanEnd to mirror them in lieu of takeWhile/takeWhileEnd and dropWhile/dropWhileEnd.

[xtendo-org]

Where did breakEnd go? I definitely remember seeing breakEnd, so I checked. It was added ten years ago (!) in 3a86c2d. 2009 was when "text" was released, which means the function should be almost as old as the project itself.

So it must have been removed later. Does anyone know what happened? breakEnd/spanEnd is really handy, and it's such a bummer that I have to roll something (probably half-baked and less performant) on my own now. :(

[epoberezkin]

spanEnd would be trivial to add, any reason why not? It would avoid double pass.

[epoberezkin]

maybe the reason is the possible confusion between which is drop and which is take, because logically it would be reversed compared with span, but documentation would comment on that:

spanEnd p t = (dropWhileEnd p t, takeWhileEnd p t)
span p t = (takeWhile p t, dropWhile p t)

[Bodigrim]

spanEnd would be trivial to add, any reason why not? It would avoid double pass.

Would you like to rebase #312 and fix review suggestions?