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import Control.Exception
import Data.List (isPrefixOf, isSuffixOf)
import System.FilePath
import System.Directory
import System.IO
-- Checks that openTempFile returns filenames with the right structure
main :: IO ()
main = do
fp0 <- otf ".no_prefix.hs"
print (".hs" `isSuffixOf` fp0)
print (".no_prefix" `isPrefixOf` takeFileName fp0)
fp1 <- otf "no_suffix"
print (not ('.' `elem` fp1))
print ("no_suffix" `isPrefixOf` takeFileName fp1)
fp2 <- otf "one_suffix.hs"
print (".hs" `isSuffixOf` fp2)
print ("one_suffix" `isPrefixOf` takeFileName fp2)
fp3 <- otf "two_suffixes.hs.blah"
print (".blah" `isSuffixOf` fp3)
print ("two_suffixes.hs" `isPrefixOf` takeFileName fp3)
otf :: FilePath -> IO FilePath
otf fp = do putStrLn fp
bracket (openTempFile "." fp)
(\(fp', h) -> do hClose h
removeFile fp')
(\(fp', _) -> case fp' of
'.' : '/' : fp'' -> return fp''
'.' : '\\' : fp'' -> return fp''
_ -> return fp')
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