From be02ef96aa89a6af554a622f266d700ac0c98fdf Mon Sep 17 00:00:00 2001 From: Joey Hess Date: Fri, 11 Apr 2014 01:19:05 -0400 Subject: propellor (0.3.0) unstable; urgency=medium * ipv6to4: Ensure interface is brought up automatically on boot. * Enabling unattended upgrades now ensures that cron is installed and running to perform them. * Properties can be scheduled to only be checked after a given time period. * Fix bootstrapping of dependencies. * Fix compilation on Debian stable. * Include security updates in sources.list for stable and testing. * Use ssh connection caching, especially when bootstrapping. * Properties now run in a Propellor monad, which provides access to attributes of the host. # imported from the archive --- Utility/Data.hs | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) create mode 100644 Utility/Data.hs (limited to 'Utility/Data.hs') diff --git a/Utility/Data.hs b/Utility/Data.hs new file mode 100644 index 00000000..35925829 --- /dev/null +++ b/Utility/Data.hs @@ -0,0 +1,17 @@ +{- utilities for simple data types + - + - Copyright 2013 Joey Hess + - + - 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 -- cgit v1.3-2-g0d8e