git-annex/CatFile.hs
Joey Hess ad245a6375 refactor catfile code
split into generic IO code, and a thin Annex wrapper
2011-09-28 15:17:36 -04:00

26 lines
653 B
Haskell

{- git cat-file interface, with handle automatically stored in the Annex monad
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module CatFile (
catFile
) where
import Control.Monad.State
import qualified Git.CatFile
import Types
import qualified Annex
catFile :: String -> FilePath -> Annex String
catFile branch file = maybe startup go =<< Annex.getState Annex.catfilehandle
where
startup = do
g <- Annex.gitRepo
h <- liftIO $ Git.CatFile.catFileStart g
Annex.changeState $ \s -> s { Annex.catfilehandle = Just h }
go h
go h = liftIO $ Git.CatFile.catFile h branch file