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|
{- git-annex command
-
- Copyright 2015 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Command.Smudge where
import Common.Annex
import Command
import Types.Key
import qualified Data.ByteString.Lazy as B
cmd :: Command
cmd = noCommit $ noMessages $ dontCheck repoExists $
command "smudge" SectionPlumbing
"git smudge filter"
paramFile (withParams seek)
seek :: CmdParams -> CommandSeek
seek = withWords start
start :: [String] -> CommandStart
start [_file] = do
liftIO $ fileEncoding stdin
s <- liftIO $ hGetContents stdin
case parsePointer s of
Nothing -> liftIO $ putStr s
Just k -> do
content <- calcRepo (gitAnnexLocation k)
liftIO $ maybe
(putStr s)
(B.hPut stdout)
=<< catchMaybeIO (B.readFile content)
stop
start [] = error "smudge filter run without filename; upgrade git"
start _ = error "smudge filter passed multiple filenames"
parsePointer :: String -> Maybe Key
parsePointer s
| length s' >= maxsz = Nothing -- too long to be a key pointer
| otherwise = headMaybe (lines s') >>= file2key
where
s' = take maxsz s
maxsz = 81920
|
