36 lines
848 B
Haskell
36 lines
848 B
Haskell
{-# LANGUAGE CPP #-}
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module Utils where
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import Control.Applicative
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import Data.Traversable
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import System.Directory
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#if MIN_VERSION_directory(1,2,0)
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import Data.Time (UTCTime)
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#else
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import System.Time (ClockTime)
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#endif
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#if MIN_VERSION_directory(1,2,0)
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type ModTime = UTCTime
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#else
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type ModTime = ClockTime
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#endif
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data TimedFile = TimedFile { tfPath :: FilePath, tfTime :: ModTime }
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deriving (Eq, Show)
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instance Ord TimedFile where
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compare (TimedFile _ a) (TimedFile _ b) = compare a b
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timeFile :: FilePath -> IO TimedFile
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timeFile f = TimedFile <$> pure f <*> getModificationTime f
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mightExist :: FilePath -> IO (Maybe FilePath)
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mightExist f = do
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exists <- doesFileExist f
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return $ if exists then (Just f) else (Nothing)
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timeMaybe :: FilePath -> IO (Maybe TimedFile)
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timeMaybe f = traverse timeFile =<< mightExist f
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