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{- git-annex branch state management
-
- Runtime state about the git-annex branch, including a small read cache.
-
- Copyright 2011-2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Annex.BranchState where
import Common.Annex
import Types.BranchState
import qualified Annex
getState :: Annex BranchState
getState = Annex.getState Annex.branchstate
setState :: BranchState -> Annex ()
setState state = Annex.changeState $ \s -> s { Annex.branchstate = state }
changeState :: (BranchState -> BranchState) -> Annex ()
changeState changer = setState =<< changer <$> getState
setCache :: FilePath -> String -> Annex ()
setCache file content = changeState $ \s -> s
{ cachedFile = Just file, cachedContent = content}
getCache :: FilePath -> Annex (Maybe String)
getCache file = from <$> getState
where
from state
| cachedFile state == Just file =
Just $ cachedContent state
| otherwise = Nothing
invalidateCache :: Annex ()
invalidateCache = changeState $ \s -> s
{ cachedFile = Nothing, cachedContent = "" }
{- Runs an action to check that the index file exists, if it's not been
- checked before in this run of git-annex. -}
checkIndexOnce :: Annex () -> Annex ()
checkIndexOnce a = unlessM (indexChecked <$> getState) $ do
a
changeState $ \s -> s { indexChecked = True }
{- Runs an action to update the branch, if it's not been updated before
- in this run of git-annex. -}
runUpdateOnce :: Annex () -> Annex ()
runUpdateOnce a = unlessM (branchUpdated <$> getState) $ do
a
disableUpdate
{- Avoids updating the branch. A useful optimisation when the branch
- is known to have not changed, or git-annex won't be relying on info
- from it. -}
disableUpdate :: Annex ()
disableUpdate = changeState $ \s -> s { branchUpdated = True }
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