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--
-- | Auxiliary functions for working with directories.
module System.Directory.Extra
    ( copyDirectoryRecursive
    , copyFile'
    )
  where

-- External imports
import qualified Control.Exception         as E
import           Distribution.Simple.Utils ( getDirectoryContentsRecursive )
import           System.Directory          ( copyFile,
                                             createDirectoryIfMissing )
import           System.Exit               ( ExitCode (ExitFailure), exitWith )
import           System.FilePath           ( takeDirectory, (</>) )
import           System.IO                 ( hPutStrLn, stderr )

-- | Copy all files from one directory to another.
copyDirectoryRecursive :: FilePath  -- ^ Source directory
                       -> FilePath  -- ^ Target directory
                       -> IO ()
copyDirectoryRecursive :: FilePath -> FilePath -> IO ()
copyDirectoryRecursive FilePath
sourceDir FilePath
targetDir =
  forall e a. Exception e => (e -> IO a) -> IO a -> IO a
E.handle (FilePath -> FilePath -> SomeException -> IO ()
copyDirectoryRecursiveErrorHandler FilePath
sourceDir FilePath
targetDir) forall a b. (a -> b) -> a -> b
$ do
    -- Obtain files in source directory
    [FilePath]
files <- FilePath -> IO [FilePath]
getDirectoryContentsRecursive FilePath
sourceDir

    -- Determine the actual source and destination path for a file.
    let sourceAndDest :: FilePath -> (FilePath, FilePath)
sourceAndDest FilePath
file = (FilePath
src, FilePath
dest)
          where
            src :: FilePath
src  = FilePath
sourceDir FilePath -> FilePath -> FilePath
</> FilePath
file
            dest :: FilePath
dest = FilePath
targetDir FilePath -> FilePath -> FilePath
</> FilePath
file

    -- Copy all the files, replacing the top directory.
    forall (t :: * -> *) (m :: * -> *) a b.
(Foldable t, Monad m) =>
(a -> m b) -> t a -> m ()
mapM_ ((FilePath, FilePath) -> IO ()
copyFile' forall b c a. (b -> c) -> (a -> b) -> a -> c
. FilePath -> (FilePath, FilePath)
sourceAndDest) [FilePath]
files

-- | Copy file origin to dest, creating the target directory if it does not
-- exist.
copyFile' :: (FilePath, FilePath) -> IO ()
copyFile' :: (FilePath, FilePath) -> IO ()
copyFile' (FilePath
origin, FilePath
dest) = do
  Bool -> FilePath -> IO ()
createDirectoryIfMissing Bool
True (FilePath -> FilePath
takeDirectory FilePath
dest)
  FilePath -> FilePath -> IO ()
copyFile FilePath
origin FilePath
dest

-- | Handle the case in which the source directory cannot be copied or the
-- target directory cannot be created/written.
copyDirectoryRecursiveErrorHandler :: FilePath
                                   -> FilePath
                                   -> E.SomeException
                                   -> IO ()
copyDirectoryRecursiveErrorHandler :: FilePath -> FilePath -> SomeException -> IO ()
copyDirectoryRecursiveErrorHandler FilePath
sourceDir FilePath
targetDir SomeException
_exception = do
  Handle -> FilePath -> IO ()
hPutStrLn Handle
stderr forall a b. (a -> b) -> a -> b
$
    FilePath
"ogma: error: cannot copy " forall a. [a] -> [a] -> [a]
++ FilePath
sourceDir forall a. [a] -> [a] -> [a]
++ FilePath
" to " forall a. [a] -> [a] -> [a]
++ FilePath
targetDir
  forall a. ExitCode -> IO a
exitWith (Int -> ExitCode
ExitFailure Int
1)