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