until -package:numeric-prelude -package:base-prelude -package:distribution-opensuse -package:extra -package:util -package:hledger-web -package:conferer -package:protolude -package:snap-core package:utility-ht is:exact

until :: Monad m => (a -> Bool) -> m a -> m a
utility-ht Control.Monad.HT
repeat action until result fulfills condition