43 lines
1.2 KiB
Haskell
43 lines
1.2 KiB
Haskell
{- git-annex worktree files
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-
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- Copyright 2013-2015 Joey Hess <id@joeyh.name>
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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.WorkTree where
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import Annex.Common
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import Annex.Link
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import Annex.CatFile
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import Annex.Version
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import Config
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{- Looks up the key corresponding to an annexed file in the work tree,
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- by examining what the file links to.
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-
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- An unlocked file will not have a link on disk, so fall back to
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- looking for a pointer to a key in git.
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-}
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lookupFile :: FilePath -> Annex (Maybe Key)
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lookupFile file = do
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mkey <- isAnnexLink file
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case mkey of
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Just key -> makeret key
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Nothing -> ifM (versionSupportsUnlockedPointers <||> isDirect)
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( ifM (liftIO $ doesFileExist file)
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( maybe (return Nothing) makeret =<< catKeyFile file
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, return Nothing
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)
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, return Nothing
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)
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where
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makeret = return . Just
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{- Modifies an action to only act on files that are already annexed,
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- and passes the key on to it. -}
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whenAnnexed :: (FilePath -> Key -> Annex (Maybe a)) -> FilePath -> Annex (Maybe a)
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whenAnnexed a file = ifAnnexed file (a file) (return Nothing)
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ifAnnexed :: FilePath -> (Key -> Annex a) -> Annex a -> Annex a
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ifAnnexed file yes no = maybe no yes =<< lookupFile file
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