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{- git-annex monad -}
module Annex (
new,
run,
gitRepo,
gitRepoChange,
backends,
backendsChange,
) where
import Control.Monad.State
import qualified GitRepo as Git
import Types
import qualified BackendTypes as Backend
{- Create and returns an Annex state object for the specified git repo.
-}
new :: Git.Repo -> IO AnnexState
new g = do
let s = Backend.AnnexState { Backend.repo = g, Backend.backends = [] }
(_,s') <- Annex.run s (prep g)
return s'
where
prep g = do
-- read git config and update state
g' <- liftIO $ Git.configRead g
Annex.gitRepoChange g'
-- performs an action in the Annex monad
run state action = runStateT (action) state
-- Annex monad state accessors
gitRepo :: Annex Git.Repo
gitRepo = do
state <- get
return (Backend.repo state)
gitRepoChange :: Git.Repo -> Annex ()
gitRepoChange r = do
state <- get
put state { Backend.repo = r }
return ()
backends :: Annex [Backend]
backends = do
state <- get
return (Backend.backends state)
backendsChange :: [Backend] -> Annex ()
backendsChange b = do
state <- get
put state { Backend.backends = b }
return ()
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