26 lines
669 B
Haskell
26 lines
669 B
Haskell
{- Time for humans.
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-
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- Copyright 2012 Joey Hess <joey@kitenet.net>
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-
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- Licensed under the GNU GPL version 3 or higher.
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-}
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module Utility.HumanTime where
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import Utility.PartialPrelude
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import Data.Time.Clock.POSIX (POSIXTime)
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{- Parses a human-input time duration, of the form "5h" or "1m". -}
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parseDuration :: String -> Maybe POSIXTime
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parseDuration s = do
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num <- readish s :: Maybe Integer
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units <- findUnits =<< lastMaybe s
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return $ fromIntegral num * units
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where
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findUnits 's' = Just 1
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findUnits 'm' = Just 60
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findUnits 'h' = Just $ 60 * 60
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findUnits 'd' = Just $ 60 * 60 * 24
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findUnits 'y' = Just $ 60 * 60 * 24 * 365
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findUnits _ = Nothing
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