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|
--------------------------------------------------------------------------------
-- | Exports simple compilers to just copy files
{-# LANGUAGE DeriveDataTypeable #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
module Hakyll.Core.File
( CopyFile (..)
, copyFileCompiler
, TmpFile (..)
, newTmpFile
) where
--------------------------------------------------------------------------------
import Data.Binary (Binary (..))
import Data.Typeable (Typeable)
import System.Directory (copyFile, doesFileExist,
renameFile)
import System.FilePath ((</>))
import System.Random (randomIO)
--------------------------------------------------------------------------------
import Hakyll.Core.Compiler
import Hakyll.Core.Compiler.Internal
import Hakyll.Core.Configuration
import Hakyll.Core.Item
import Hakyll.Core.Provider
import qualified Hakyll.Core.Store as Store
import Hakyll.Core.Util.File
import Hakyll.Core.Writable
--------------------------------------------------------------------------------
-- | This will copy any file directly by using a system call
newtype CopyFile = CopyFile FilePath
deriving (Binary, Eq, Ord, Show, Typeable)
--------------------------------------------------------------------------------
instance Writable CopyFile where
write dst (Item _ (CopyFile src)) = copyFile src dst
--------------------------------------------------------------------------------
copyFileCompiler :: Compiler (Item CopyFile)
copyFileCompiler = do
identifier <- getUnderlying
provider <- compilerProvider <$> compilerAsk
makeItem $ CopyFile $ resourceFilePath provider identifier
--------------------------------------------------------------------------------
newtype TmpFile = TmpFile FilePath
deriving (Typeable)
--------------------------------------------------------------------------------
instance Binary TmpFile where
put _ = return ()
get = error $
"Hakyll.Core.File.TmpFile: You tried to load a TmpFile, however, " ++
"this is not possible since these are deleted as soon as possible."
--------------------------------------------------------------------------------
instance Writable TmpFile where
write dst (Item _ (TmpFile fp)) = renameFile fp dst
--------------------------------------------------------------------------------
-- | Create a tmp file
newTmpFile :: String -- ^ Suffix and extension
-> Compiler TmpFile -- ^ Resulting tmp path
newTmpFile suffix = do
path <- mkPath
compilerUnsafeIO $ makeDirectories path
debugCompiler $ "newTmpFile " ++ path
return $ TmpFile path
where
mkPath = do
rand <- compilerUnsafeIO $ randomIO :: Compiler Int
tmp <- tmpDirectory . compilerConfig <$> compilerAsk
let path = tmp </> Store.hash [show rand] ++ "-" ++ suffix
exists <- compilerUnsafeIO $ doesFileExist path
if exists then mkPath else return path
|
