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author | Joey Hess <joey@kitenet.net> | 2013-11-18 13:06:58 -0400 |
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committer | Joey Hess <joey@kitenet.net> | 2013-11-18 13:06:58 -0400 |
commit | 471aa27bf0a0e4c698303acb7fdf9cea6a75634b (patch) | |
tree | 8934b0b32c315922f00cb82d772df885301a2582 /Utility/Data.hs | |
download | git-repair-471aa27bf0a0e4c698303acb7fdf9cea6a75634b.tar.gz |
copied from git-annex
Diffstat (limited to 'Utility/Data.hs')
-rw-r--r-- | Utility/Data.hs | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/Utility/Data.hs b/Utility/Data.hs new file mode 100644 index 0000000..3592582 --- /dev/null +++ b/Utility/Data.hs @@ -0,0 +1,17 @@ +{- utilities for simple data types + - + - Copyright 2013 Joey Hess <joey@kitenet.net> + - + - Licensed under the GNU GPL version 3 or higher. + -} + +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 |