79 lines
1.7 KiB
Haskell
79 lines
1.7 KiB
Haskell
{- git-annex core data types -}
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module Types (
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Annex(..),
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makeAnnexState,
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runAnnexState,
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gitAnnex,
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gitAnnexChange,
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backendsAnnex,
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backendsAnnexChange,
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AnnexState(..),
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Key(..),
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Backend(..)
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) where
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import Control.Monad.State
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import Data.String.Utils
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import GitRepo
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-- git-annex's runtime state
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data AnnexState = AnnexState {
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repo :: GitRepo,
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backends :: [Backend]
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} deriving (Show)
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-- git-annex's monad
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type Annex = StateT AnnexState IO
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-- constructor
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makeAnnexState :: GitRepo -> AnnexState
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makeAnnexState g = AnnexState { repo = g, backends = [] }
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-- performs an action in the Annex monad
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runAnnexState state action = runStateT (action) state
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-- state accessors
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gitAnnex :: Annex GitRepo
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gitAnnex = do
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state <- get
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return (repo state)
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gitAnnexChange :: GitRepo -> Annex ()
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gitAnnexChange r = do
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state <- get
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put state { repo = r }
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return ()
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backendsAnnex :: Annex [Backend]
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backendsAnnex = do
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state <- get
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return (backends state)
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backendsAnnexChange :: [Backend] -> Annex ()
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backendsAnnexChange b = do
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state <- get
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put state { backends = b }
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return ()
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-- annexed filenames are mapped into keys
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data Key = Key String deriving (Eq)
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-- show a key to convert it to a string
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instance Show Key where
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show (Key v) = v
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-- this structure represents a key/value backend
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data Backend = Backend {
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-- name of this backend
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name :: String,
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-- converts a filename to a key
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getKey :: FilePath -> Annex (Maybe Key),
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-- stores a file's contents to a key
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storeFileKey :: FilePath -> Key -> Annex Bool,
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-- retrieves a key's contents to a file
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retrieveKeyFile :: Key -> FilePath -> Annex Bool,
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-- removes a key
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removeKey :: Key -> Annex Bool
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}
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instance Show Backend where
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show backend = "Backend { name =\"" ++ (name backend) ++ "\" }"
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