module Development.Shake.Directory(
doesFileExist,
getDirectoryContents, getDirectoryFiles, getDirectoryDirs,
defaultRuleDirectory
) where
import Control.DeepSeq
import Control.Monad
import Control.Monad.IO.Class
import Data.Binary
import Data.Hashable
import Data.List
import Data.Typeable
import qualified System.Directory as IO
import Development.Shake.Core
import Development.Shake.FilePath
import Development.Shake.FilePattern
newtype DoesFileExistQ = DoesFileExistQ FilePath
deriving (Typeable,Eq,Hashable,Binary,NFData)
instance Show DoesFileExistQ where
show (DoesFileExistQ a) = "Exists? " ++ a
newtype DoesFileExistA = DoesFileExistA Bool
deriving (Typeable,Eq,Hashable,Binary,NFData)
instance Show DoesFileExistA where
show (DoesFileExistA a) = show a
data GetDirectoryQ
= GetDir {dir :: FilePath}
| GetDirFiles {dir :: FilePath, pat :: FilePattern}
| GetDirDirs {dir :: FilePath}
deriving (Typeable,Eq)
newtype GetDirectoryA = GetDirectoryA [FilePath]
deriving (Typeable,Show,Eq,Hashable,Binary,NFData)
instance Show GetDirectoryQ where
show (GetDir x) = "Listing " ++ x
show (GetDirFiles a b) = "Files " ++ a </> b
show (GetDirDirs x) = "Dirs " ++ x
instance NFData GetDirectoryQ where
rnf (GetDir a) = rnf a
rnf (GetDirFiles a b) = rnf a `seq` rnf b
rnf (GetDirDirs a) = rnf a
instance Hashable GetDirectoryQ where
hashWithSalt salt = hashWithSalt salt . f
where f (GetDir x) = (0 :: Int, x, "")
f (GetDirFiles x y) = (1, x, y)
f (GetDirDirs x) = (2, x, "")
instance Binary GetDirectoryQ where
get = do
i <- getWord8
case i of
0 -> liftM GetDir get
1 -> liftM2 GetDirFiles get get
2 -> liftM GetDirDirs get
put (GetDir x) = putWord8 0 >> put x
put (GetDirFiles x y) = putWord8 1 >> put x >> put y
put (GetDirDirs x) = putWord8 2 >> put x
instance Rule DoesFileExistQ DoesFileExistA where
storedValue (DoesFileExistQ x) = fmap (Just . DoesFileExistA) $ IO.doesFileExist x
instance Rule GetDirectoryQ GetDirectoryA where
storedValue x = fmap Just $ getDir x
defaultRuleDirectory :: Rules ()
defaultRuleDirectory = do
defaultRule $ \(DoesFileExistQ x) -> Just $
liftIO $ fmap DoesFileExistA $ IO.doesFileExist x
defaultRule $ \(x :: GetDirectoryQ) -> Just $
liftIO $ getDir x
doesFileExist :: FilePath -> Action Bool
doesFileExist file = do
DoesFileExistA res <- apply1 $ DoesFileExistQ file
return res
getDirectoryContents :: FilePath -> Action [FilePath]
getDirectoryContents x = getDirAction $ GetDir x
getDirectoryFiles :: FilePath -> FilePattern -> Action [FilePath]
getDirectoryFiles x f = getDirAction $ GetDirFiles x f
getDirectoryDirs :: FilePath -> Action [FilePath]
getDirectoryDirs x = getDirAction $ GetDirDirs x
getDirAction x = do GetDirectoryA y <- apply1 x; return y
getDir :: GetDirectoryQ -> IO GetDirectoryA
getDir x = fmap (GetDirectoryA . sort) $ f x . filter validName =<< IO.getDirectoryContents (dir x)
where
validName = not . all (== '.')
f GetDir{} xs = return xs
f GetDirFiles{} xs = flip filterM xs $ \s ->
if not $ pat x ?== s then return False else IO.doesFileExist $ dir x </> s
f GetDirDirs{} xs = flip filterM xs $ \s -> IO.doesDirectoryExist $ dir x </> s