98 lines
3 KiB
Haskell
98 lines
3 KiB
Haskell
{- git-annex command line parsing and dispatch
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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 CmdLine (
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dispatch,
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usage,
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shutdown
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) where
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import qualified Control.Exception as E
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import Control.Exception (throw)
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import System.Console.GetOpt
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import Common.Annex
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import qualified Annex
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import qualified Annex.Queue
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import qualified Git
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import qualified Git.Command
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import Annex.Content
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import Annex.Ssh
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import Command
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type Params = [String]
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type Flags = [Annex ()]
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{- Runs the passed command line. -}
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dispatch :: Params -> [Command] -> [Option] -> String -> IO Git.Repo -> IO ()
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dispatch args cmds commonoptions header getgitrepo = do
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setupConsole
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r <- E.try getgitrepo :: IO (Either E.SomeException Git.Repo)
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case r of
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Left e -> fromMaybe (throw e) (cmdnorepo cmd)
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Right g -> do
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state <- Annex.new g
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(actions, state') <- Annex.run state $ do
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sequence_ flags
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prepCommand cmd params
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tryRun state' cmd $ [startup] ++ actions ++ [shutdown $ cmdoneshot cmd]
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where
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(flags, cmd, params) = parseCmd args cmds commonoptions header
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{- Parses command line, and returns actions to run to configure flags,
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- the Command being run, and the remaining parameters for the command. -}
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parseCmd :: Params -> [Command] -> [Option] -> String -> (Flags, Command, Params)
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parseCmd argv cmds commonoptions header
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| isNothing name = err "missing command"
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| null matches = err $ "unknown command " ++ fromJust name
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| otherwise = check $ getOpt Permute (commonoptions ++ cmdoptions cmd) args
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where
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(name, args) = findname argv []
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findname [] c = (Nothing, reverse c)
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findname (a:as) c
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| "-" `isPrefixOf` a = findname as (a:c)
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| otherwise = (Just a, reverse c ++ as)
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matches = filter (\c -> name == Just (cmdname c)) cmds
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cmd = Prelude.head matches
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check (flags, rest, []) = (flags, cmd, rest)
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check (_, _, errs) = err $ concat errs
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err msg = error $ msg ++ "\n\n" ++ usage header cmds commonoptions
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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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-}
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tryRun :: Annex.AnnexState -> Command -> [CommandCleanup] -> IO ()
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tryRun = tryRun' 0
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tryRun' :: Integer -> Annex.AnnexState -> Command -> [CommandCleanup] -> IO ()
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tryRun' errnum _ cmd []
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| errnum > 0 = error $ cmdname cmd ++ ": " ++ show errnum ++ " failed"
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| otherwise = return ()
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tryRun' errnum state cmd (a:as) = do
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r <- run
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handle $! r
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where
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run = tryIO $ Annex.run state $ do
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Annex.Queue.flushWhenFull
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a
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handle (Left err) = showerr err >> cont False state
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handle (Right (success, state')) = cont success state'
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cont success s = tryRun' (if success then errnum else errnum + 1) s cmd as
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showerr err = Annex.eval state $ do
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showErr err
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showEndFail
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{- Actions to perform each time ran. -}
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startup :: Annex Bool
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startup = return True
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{- Cleanup actions. -}
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shutdown :: Bool -> Annex Bool
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shutdown oneshot = do
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saveState oneshot
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liftIO Git.Command.reap -- zombies from long-running git processes
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sshCleanup -- ssh connection caching
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return True
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