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|
{- git-annex monad
-
- Copyright 2010 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Annex (
Annex,
AnnexState(..),
new,
run,
eval,
getState,
changeState,
gitRepo
) where
import Control.Monad.State
(liftIO, StateT, runStateT, evalStateT, liftM, get, put)
import qualified GitRepo as Git
import qualified GitQueue
import qualified BackendClass
import qualified RemoteClass
import qualified CryptoTypes
-- git-annex's monad
type Annex = StateT AnnexState IO
-- internal state storage
data AnnexState = AnnexState
{ repo :: Git.Repo
, backends :: [BackendClass.Backend Annex]
, supportedBackends :: [BackendClass.Backend Annex]
, remotes :: [RemoteClass.Remote Annex]
, repoqueue :: GitQueue.Queue
, quiet :: Bool
, force :: Bool
, fast :: Bool
, defaultbackend :: Maybe String
, defaultkey :: Maybe String
, toremote :: Maybe String
, fromremote :: Maybe String
, exclude :: [String]
, cipher :: Maybe CryptoTypes.Cipher
}
newState :: Git.Repo -> [BackendClass.Backend Annex] -> AnnexState
newState gitrepo allbackends = AnnexState
{ repo = gitrepo
, backends = []
, remotes = []
, supportedBackends = allbackends
, repoqueue = GitQueue.empty
, quiet = False
, force = False
, fast = False
, defaultbackend = Nothing
, defaultkey = Nothing
, toremote = Nothing
, fromremote = Nothing
, exclude = []
, cipher = Nothing
}
{- Create and returns an Annex state object for the specified git repo. -}
new :: Git.Repo -> [BackendClass.Backend Annex] -> IO AnnexState
new gitrepo allbackends = do
gitrepo' <- liftIO $ Git.configRead gitrepo
return $ newState gitrepo' allbackends
{- performs an action in the Annex monad -}
run :: AnnexState -> Annex a -> IO (a, AnnexState)
run state action = runStateT action state
eval :: AnnexState -> Annex a -> IO a
eval state action = evalStateT action state
{- Gets a value from the internal state, selected by the passed value
- constructor. -}
getState :: (AnnexState -> a) -> Annex a
getState c = liftM c get
{- Applies a state mutation function to change the internal state.
-
- Example: changeState (\s -> s { quiet = True })
-}
changeState :: (AnnexState -> AnnexState) -> Annex ()
changeState a = put . a =<< get
{- Returns the git repository being acted on -}
gitRepo :: Annex Git.Repo
gitRepo = getState repo
|
