--- /dev/null
+
+module Main (main) where
+
+import Control.Monad
+import Data.List
+import System.Environment
+import System.Exit
+import System.FilePath
+import System.IO
+
+data CleanWhat = CleanFile FilePath
+ | CleanRec FilePath
+ deriving (Read, Show)
+
+main :: IO ()
+main = do args <- getArgs
+ case args of
+ [contentsBeforeFile, contentsAfterFile, wouldBeCleanedFile] ->
+ doit contentsBeforeFile contentsAfterFile wouldBeCleanedFile
+ _ ->
+ error "Bad args"
+
+doit :: FilePath -> FilePath -> FilePath -> IO ()
+doit contentsBeforeFile contentsAfterFile wouldBeCleanedFile
+ = do contentsBefore <- liftM lines $ readFile contentsBeforeFile
+ contentsAfter <- liftM lines $ readFile contentsAfterFile
+ wouldBeCleaned <- liftM (map read . lines) $ readFile wouldBeCleanedFile
+ let newContentsAfter = contentsAfter \\ contentsBefore
+ let cleanedAfter = simulateCleans newContentsAfter wouldBeCleaned
+ unless (null cleanedAfter) $ do
+ hPutStrLn stderr "Files not cleaned:"
+ mapM_ (hPutStrLn stderr . show) cleanedAfter
+ exitWith (ExitFailure 1)
+
+simulateCleans :: [FilePath] -> [CleanWhat] -> [FilePath]
+simulateCleans fs cws = filter (not . cleaned) fs
+ where cleaned f = any (`willClean` f) cws
+
+willClean :: CleanWhat -> FilePath -> Bool
+CleanFile fp `willClean` f = fp `equalFilePath` f
+CleanRec fp `willClean` f
+ = any (fp `equalFilePath`) (map joinPath $ inits $ splitPath f)
+