66 lines
1.6 KiB
Haskell
66 lines
1.6 KiB
Haskell
{- git-annex command
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-
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- Copyright 2010 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 Command.DropUnused where
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import Control.Monad (when)
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import Control.Monad.State (liftIO)
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import qualified Data.Map as M
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import System.Directory
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import Data.Maybe
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import Command
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import Types
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import Messages
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import Locations
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import qualified Annex
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import qualified Command.Drop
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import Backend
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import Key
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command :: [Command]
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command = [repoCommand "dropunused" (paramRepeating paramNumber) seek
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"drop unused file content"]
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seek :: [CommandSeek]
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seek = [withUnusedMap]
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{- Read unusedlog once, and pass the map to each start action. -}
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withUnusedMap :: CommandSeek
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withUnusedMap params = do
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m <- readUnusedLog
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return $ map (start m) params
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start :: M.Map String Key -> CommandStartString
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start m s = notBareRepo $ do
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case M.lookup s m of
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Nothing -> return Nothing
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Just key -> do
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g <- Annex.gitRepo
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showStart "dropunused" s
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backend <- keyBackend key
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-- drop both content in the backend and any tmp
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-- file for the key
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let tmp = gitAnnexTmpLocation g key
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tmp_exists <- liftIO $ doesFileExist tmp
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when tmp_exists $ liftIO $ removeFile tmp
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return $ Just $ Command.Drop.perform key backend (Just 0)
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readUnusedLog :: Annex (M.Map String Key)
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readUnusedLog = do
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g <- Annex.gitRepo
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let f = gitAnnexUnusedLog g
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e <- liftIO $ doesFileExist f
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if e
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then do
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l <- liftIO $ readFile f
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return $ M.fromList $ map parse $ lines l
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else return $ M.empty
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where
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parse line = (head ws, fromJust $ readKey $ unwords $ tail ws)
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where
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ws = words line
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