Provides useful anaphoric and monadic versions of if-else and when, as
well as infix operators for the actions to allow things like this:
-- Allow the clause to be in m a
whenM (Gtk.widgetIsFocus win) $ do
this
that
-- anaphoric if. If the condition is nonempty, pass the conditional
value to the "then" clause, otherwise do an action that requires no
parameter.
aif (lookup name list)
(\file -> Right `liftM` hGetLine file)
(do f <- openFile name
l <- hGetLine file
return $ Right (f,l))
-- infix version of Control.Monad.When
(x>5) >>? putStrLn x
-- infix version of anaphoric when
lookup name list >>=? \value -> putStrLn value
-- infix version of anaphoric whenM
Gtk.widgetIntersect win rect >>=>>? \intersectingRectangle' ->
Gtk.invalidate intersectingRectangle'
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