44 lines
1 KiB
Haskell
44 lines
1 KiB
Haskell
{- git-annex-shell command
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-
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- Copyright 2014 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 Command.NotifyChanges where
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import Command
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import Annex.ChangedRefs
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import RemoteDaemon.Transport.Ssh.Types
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import Utility.SimpleProtocol
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import Control.Concurrent.Async
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cmd :: Command
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cmd = noCommit $
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command "notifychanges" SectionPlumbing
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"sends notification when git refs are changed"
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paramNothing (withParams seek)
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seek :: CmdParams -> CommandSeek
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seek = withNothing start
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start :: CommandStart
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start = go =<< watchChangedRefs
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where
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go (Just h) = do
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-- No messages need to be received from the caller,
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-- but when it closes the connection, notice and terminate.
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let receiver = forever $ void $ getProtocolLine stdin
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let sender = forever $ send . CHANGED =<< waitChangedRefs h
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liftIO $ send READY
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void $ liftIO $ concurrently sender receiver
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liftIO $ stopWatchingChangedRefs h
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stop
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go Nothing = stop
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send :: Notification -> IO ()
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send n = do
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putStrLn $ unwords $ formatMessage n
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hFlush stdout
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