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module File(
countLines
) where
import qualified System.IO as IO
countLines :: FilePath -> IO Int
countLines f = do
h <- IO.openFile f IO.ReadMode
e <- IO.hIsEOF h
if e
then IO.hClose h >> return 0
else countLinesTail h 0
countLinesTail :: IO.Handle -> Int -> IO Int
countLinesTail h n = do
t <- IO.hGetLine h
e <- IO.hIsEOF h
if e
then IO.hClose h >> return (n + 1)
else countLinesTail h (n + 1)
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