47 lines
1.3 KiB
Haskell
47 lines
1.3 KiB
Haskell
{- git-annex main program -}
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import IO (try)
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import System.IO
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import System.Environment
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import qualified Annex
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import Types
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import Core
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import Commands
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import qualified GitRepo as Git
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import BackendList
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main = do
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args <- getArgs
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gitrepo <- Git.repoFromCwd
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state <- Annex.new gitrepo allBackends
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(configure, actions) <- parseCmd args state
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tryRun state $ [startup] ++ configure ++ actions ++ [shutdown]
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{- Runs a list of Annex actions. Catches IO errors and continues
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- (but explicitly thrown errors terminate the whole command).
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- Propigates an overall error status at the end.
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-
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- This runs in the IO monad, not in the Annex monad. It seems that
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- exceptions can only be caught in the IO monad, not in a stacked monad;
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- or more likely I missed an easy way to do it. So, I have to laboriously
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- thread AnnexState through this function.
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-}
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tryRun :: AnnexState -> [Annex ()] -> IO ()
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tryRun state actions = tryRun' state 0 actions
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tryRun' state errnum (a:as) = do
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result <- try $ Annex.run state a
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case (result) of
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Left err -> do
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showErr err
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tryRun' state (errnum + 1) as
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Right (_,state') -> tryRun' state' errnum as
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tryRun' state errnum [] = do
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if (errnum > 0)
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then error $ (show errnum) ++ " failed"
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else return ()
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{- Exception pretty-printing. -}
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showErr e = do
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hPutStrLn stderr $ "git-annex: " ++ (show e)
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return ()
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