1 files changed, 18 insertions, 0 deletions
diff --git a/client/src/Util/WaitFor.hs b/client/src/Util/WaitFor.hs
new file mode 100644
index 0000000..0175c95
--- /dev/null
+++ b/client/src/Util/WaitFor.hs
@@ -0,0 +1,18 @@
+module Util.WaitFor
+  ( waitFor
+  ) where
+
+import           Data.Time  (NominalDiffTime)
+import           Reflex.Dom (Dynamic, Event, MonadWidget)
+import qualified Reflex.Dom as R
+
+waitFor
+  :: forall t m a b. MonadWidget t m
+  => (Event t a -> m (Event t b))
+  -> Event t ()
+  -> Dynamic t a
+  -> m (Event t b, Event t Bool)
+waitFor op start input = do
+  result <- op (R.tagPromptlyDyn input start) >>= R.debounce (0.5 :: NominalDiffTime)
+  let waiting = R.leftmost [ const True <$> start , const False <$> result ]
+  return (result, waiting)