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{- git-annex worktree files
-
- Copyright 2013-2015 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Annex.WorkTree where
import Common.Annex
import Annex.Link
import Annex.CatFile
{- Looks up the key corresponding to an annexed file,
- by examining what the file links to.
-
- An unlocked file will not have a link on disk, so fall back to
- looking for a pointer to a key in git.
-}
lookupFile :: FilePath -> Annex (Maybe Key)
lookupFile file = do
mkey <- isAnnexLink file
case mkey of
Just key -> makeret key
Nothing -> maybe (return Nothing) makeret =<< catKeyFile file
where
makeret = return . Just
{- Modifies an action to only act on files that are already annexed,
- and passes the key on to it. -}
whenAnnexed :: (FilePath -> Key -> Annex (Maybe a)) -> FilePath -> Annex (Maybe a)
whenAnnexed a file = ifAnnexed file (a file) (return Nothing)
ifAnnexed :: FilePath -> (Key -> Annex a) -> Annex a -> Annex a
ifAnnexed file yes no = maybe no yes =<< lookupFile file
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