56 lines
1.5 KiB
Haskell
56 lines
1.5 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 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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setCache :: FilePath -> String -> Annex ()
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setCache file content = do
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state <- getState
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setState state { cachedFile = Just file, cachedContent = content }
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getCache :: FilePath -> Annex (Maybe String)
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getCache file = getState >>= go
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where
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go state
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| cachedFile state == Just file =
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return $ Just $ cachedContent state
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| otherwise = return Nothing
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invalidateCache :: Annex ()
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invalidateCache = do
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state <- getState
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setState state { cachedFile = Nothing, cachedContent = "" }
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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 = Annex.changeState setupdated
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where
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setupdated s = s { Annex.branchstate = new }
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where
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new = old { branchUpdated = True }
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old = Annex.branchstate s
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