197 lines
5.1 KiB
Haskell
197 lines
5.1 KiB
Haskell
{- git-annex monad
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-
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- Copyright 2010-2011 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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{-# LANGUAGE PackageImports, GeneralizedNewtypeDeriving, TypeFamilies, MultiParamTypeClasses #-}
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module Annex (
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Annex,
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AnnexState(..),
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FileInfo(..),
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PreferredContentMap,
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new,
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newState,
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run,
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eval,
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exec,
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getState,
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changeState,
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setFlag,
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setField,
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setOutput,
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getFlag,
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getField,
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addCleanup,
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gitRepo,
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inRepo,
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fromRepo,
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) where
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import "mtl" Control.Monad.State.Strict
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import Control.Monad.Trans.Control (StM, MonadBaseControl, liftBaseWith, restoreM)
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import Control.Monad.Base (liftBase, MonadBase)
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import System.Posix.Types (Fd)
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import Common
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import qualified Git
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import qualified Git.Config
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import Git.CatFile
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import Git.CheckAttr
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import Git.SharedRepository
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import qualified Git.Queue
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import Types.Backend
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import qualified Types.Remote
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import Types.Crypto
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import Types.BranchState
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import Types.TrustLevel
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import Types.Group
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import Types.Messages
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import Types.UUID
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import Utility.State
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import qualified Utility.Matcher
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import qualified Data.Map as M
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import qualified Data.Set as S
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-- git-annex's monad
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newtype Annex a = Annex { runAnnex :: StateT AnnexState IO a }
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deriving (
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Monad,
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MonadIO,
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MonadState AnnexState,
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Functor,
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Applicative
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)
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instance MonadBase IO Annex where
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liftBase = Annex . liftBase
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instance MonadBaseControl IO Annex where
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newtype StM Annex a = StAnnex (StM (StateT AnnexState IO) a)
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liftBaseWith f = Annex $ liftBaseWith $ \runInIO ->
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f $ liftM StAnnex . runInIO . runAnnex
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restoreM = Annex . restoreM . unStAnnex
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where
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unStAnnex (StAnnex st) = st
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type Matcher a = Either [Utility.Matcher.Token a] (Utility.Matcher.Matcher a)
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data FileInfo = FileInfo
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{ relFile :: FilePath -- may be relative to cwd
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, matchFile :: FilePath -- filepath to match on; may be relative to top
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}
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type PreferredContentMap = M.Map UUID (Utility.Matcher.Matcher (S.Set UUID -> FileInfo -> Annex Bool))
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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 :: [BackendA Annex]
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, remotes :: [Types.Remote.RemoteA Annex]
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, output :: MessageState
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, force :: Bool
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, fast :: Bool
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, auto :: Bool
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, branchstate :: BranchState
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, repoqueue :: Maybe Git.Queue.Queue
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, catfilehandle :: Maybe CatFileHandle
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, checkattrhandle :: Maybe CheckAttrHandle
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, forcebackend :: Maybe String
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, forcenumcopies :: Maybe Int
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, limit :: Matcher (FileInfo -> Annex Bool)
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, uuidmap :: Maybe UUIDMap
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, preferredcontentmap :: Maybe PreferredContentMap
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, shared :: Maybe SharedRepository
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, forcetrust :: TrustMap
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, trustmap :: Maybe TrustMap
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, groupmap :: Maybe GroupMap
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, ciphers :: M.Map StorableCipher Cipher
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, lockpool :: M.Map FilePath Fd
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, flags :: M.Map String Bool
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, fields :: M.Map String String
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, cleanup :: M.Map String (Annex ())
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}
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newState :: Git.Repo -> AnnexState
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newState gitrepo = AnnexState
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{ repo = gitrepo
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, backends = []
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, remotes = []
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, output = defaultMessageState
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, force = False
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, fast = False
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, auto = False
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, branchstate = startBranchState
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, repoqueue = Nothing
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, catfilehandle = Nothing
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, checkattrhandle = Nothing
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, forcebackend = Nothing
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, forcenumcopies = Nothing
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, limit = Left []
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, uuidmap = Nothing
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, preferredcontentmap = Nothing
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, shared = Nothing
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, forcetrust = M.empty
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, trustmap = Nothing
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, groupmap = Nothing
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, ciphers = M.empty
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, lockpool = M.empty
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, flags = M.empty
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, fields = M.empty
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, cleanup = M.empty
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}
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{- Makes an Annex state object for the specified git repo.
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- Ensures the config is read, if it was not already. -}
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new :: Git.Repo -> IO AnnexState
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new = newState <$$> Git.Config.read
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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 s a = runStateT (runAnnex a) s
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eval :: AnnexState -> Annex a -> IO a
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eval s a = evalStateT (runAnnex a) s
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exec :: AnnexState -> Annex a -> IO AnnexState
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exec s a = execStateT (runAnnex a) s
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{- Sets a flag to True -}
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setFlag :: String -> Annex ()
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setFlag flag = changeState $ \s ->
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s { flags = M.insertWith' const flag True $ flags s }
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{- Sets a field to a value -}
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setField :: String -> String -> Annex ()
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setField field value = changeState $ \s ->
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s { fields = M.insertWith' const field value $ fields s }
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{- Adds a cleanup action to perform. -}
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addCleanup :: String -> Annex () -> Annex ()
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addCleanup uid a = changeState $ \s ->
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s { cleanup = M.insertWith' const uid a $ cleanup s }
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{- Sets the type of output to emit. -}
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setOutput :: OutputType -> Annex ()
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setOutput o = changeState $ \s ->
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s { output = (output s) { outputType = o } }
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{- Checks if a flag was set. -}
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getFlag :: String -> Annex Bool
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getFlag flag = fromMaybe False . M.lookup flag <$> getState flags
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{- Gets the value of a field. -}
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getField :: String -> Annex (Maybe String)
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getField field = M.lookup field <$> getState fields
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{- Returns the annex's git repository. -}
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gitRepo :: Annex Git.Repo
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gitRepo = getState repo
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{- Runs an IO action in the annex's git repository. -}
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inRepo :: (Git.Repo -> IO a) -> Annex a
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inRepo a = liftIO . a =<< gitRepo
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{- Extracts a value from the annex's git repisitory. -}
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fromRepo :: (Git.Repo -> a) -> Annex a
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fromRepo a = a <$> gitRepo
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