93 lines
2.3 KiB
Haskell
93 lines
2.3 KiB
Haskell
{- git-annex monad
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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 Annex (
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Annex,
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AnnexState(..),
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new,
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run,
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eval,
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getState,
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changeState,
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gitRepo
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) where
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import Control.Monad.State
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(liftIO, StateT, runStateT, evalStateT, liftM, get, put)
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import qualified GitRepo as Git
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import qualified GitQueue
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import qualified BackendClass
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import qualified RemoteClass
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import qualified CryptoTypes
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-- git-annex's monad
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type Annex = StateT AnnexState IO
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-- internal state storage
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data AnnexState = AnnexState
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{ repo :: Git.Repo
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, backends :: [BackendClass.Backend Annex]
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, supportedBackends :: [BackendClass.Backend Annex]
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, remotes :: [RemoteClass.Remote Annex]
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, repoqueue :: GitQueue.Queue
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, quiet :: Bool
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, force :: Bool
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, fast :: Bool
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, forcebackend :: Maybe String
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, defaultkey :: Maybe String
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, toremote :: Maybe String
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, fromremote :: Maybe String
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, exclude :: [String]
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, cipher :: Maybe CryptoTypes.Cipher
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}
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newState :: Git.Repo -> [BackendClass.Backend Annex] -> AnnexState
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newState gitrepo allbackends = AnnexState
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{ repo = gitrepo
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, backends = []
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, remotes = []
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, supportedBackends = allbackends
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, repoqueue = GitQueue.empty
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, quiet = False
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, force = False
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, fast = False
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, forcebackend = Nothing
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, defaultkey = Nothing
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, toremote = Nothing
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, fromremote = Nothing
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, exclude = []
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, cipher = Nothing
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}
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{- Create and returns an Annex state object for the specified git repo. -}
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new :: Git.Repo -> [BackendClass.Backend Annex] -> IO AnnexState
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new gitrepo allbackends = do
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gitrepo' <- liftIO $ Git.configRead gitrepo
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return $ newState gitrepo' allbackends
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{- performs an action in the Annex monad -}
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run :: AnnexState -> Annex a -> IO (a, AnnexState)
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run state action = runStateT action state
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eval :: AnnexState -> Annex a -> IO a
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eval state action = evalStateT action state
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{- Gets a value from the internal state, selected by the passed value
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- constructor. -}
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getState :: (AnnexState -> a) -> Annex a
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getState c = liftM c get
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{- Applies a state mutation function to change the internal state.
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-
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- Example: changeState (\s -> s { quiet = True })
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-}
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changeState :: (AnnexState -> AnnexState) -> Annex ()
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changeState a = put . a =<< get
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{- Returns the git repository being acted on -}
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gitRepo :: Annex Git.Repo
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gitRepo = getState repo
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