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{- git-annex command
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Command.Watch where
import Common.Annex
import Command
import qualified Annex
import CmdLine
import Utility.Inotify
import Control.Exception as E
import qualified Command.Add as Add
import System.INotify
def :: [Command]
def = [command "watch" paramPaths seek "watch for changes"]
seek :: [CommandSeek]
seek = [withNothing start]
start :: CommandStart
start = notBareRepo $ do
showStart "watch" "."
showAction "scanning"
state <- Annex.getState id
next $ next $ liftIO $ withINotify $ \i -> do
watchDir i notgit (Just $ run state onAdd) Nothing "."
putStrLn "(started)"
waitForTermination
return True
where
notgit dir = takeFileName dir /= ".git"
{- Inotify events are run in separate threads, and so each is a
- self-contained Annex monad. Exceptions by the handlers are ignored,
- otherwise a whole watcher thread could be crashed. -}
run :: Annex.AnnexState -> (FilePath -> Annex a) -> FilePath -> IO ()
run startstate a f = do
r <- E.try go :: IO (Either E.SomeException ())
case r of
Left e -> putStrLn (show e)
_ -> return ()
where
go = Annex.eval startstate $ do
_ <- a f
_ <- shutdown True
return ()
onAdd :: FilePath -> Annex Bool
onAdd file = doCommand $ Add.start file
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