From 7115d1ec162b4059b3e8e8f84bd8d5898c1db025 Mon Sep 17 00:00:00 2001 From: Joey Hess Date: Wed, 14 May 2014 19:41:05 -0400 Subject: moved source code to src This is to work around OSX's brain-damange regarding filename case insensitivity. Avoided moving config.hs, because it's a config file. Put in a symlink to make build work. --- src/Utility/Data.hs | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) create mode 100644 src/Utility/Data.hs (limited to 'src/Utility/Data.hs') diff --git a/src/Utility/Data.hs b/src/Utility/Data.hs new file mode 100644 index 00000000..2df12b36 --- /dev/null +++ b/src/Utility/Data.hs @@ -0,0 +1,17 @@ +{- utilities for simple data types + - + - Copyright 2013 Joey Hess + - + - License: BSD-2-clause + -} + +module Utility.Data where + +{- First item in the list that is not Nothing. -} +firstJust :: Eq a => [Maybe a] -> Maybe a +firstJust ms = case dropWhile (== Nothing) ms of + [] -> Nothing + (md:_) -> md + +eitherToMaybe :: Either a b -> Maybe b +eitherToMaybe = either (const Nothing) Just -- cgit v1.3-2-g0d8e