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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 (
new,
run,
eval,
gitRepo,
gitRepoChange,
backends,
backendsChange,
supportedBackends,
flagIsSet,
flagChange,
flagGet,
Flag(..),
queue,
queueGet
) where
import Control.Monad.State
import qualified Data.Map as M
import qualified GitRepo as Git
import qualified GitQueue
import Types
import qualified TypeInternals as Internals
{- Create and returns an Annex state object for the specified git repo. -}
new :: Git.Repo -> [Backend] -> IO AnnexState
new gitrepo allbackends = do
let s = Internals.AnnexState {
Internals.repo = gitrepo,
Internals.backends = [],
Internals.supportedBackends = allbackends,
Internals.flags = M.empty,
Internals.repoqueue = GitQueue.empty
}
(_,s') <- Annex.run s prep
return s'
where
prep = do
-- read git config and update state
gitrepo' <- liftIO $ Git.configRead gitrepo Nothing
Annex.gitRepoChange gitrepo'
{- performs an action in the Annex monad -}
run :: AnnexState -> StateT AnnexState IO a -> IO (a, AnnexState)
run state action = runStateT action state
eval :: AnnexState -> StateT AnnexState IO a -> IO a
eval state action = evalStateT action state
{- Returns the git repository being acted on -}
gitRepo :: Annex Git.Repo
gitRepo = do
state <- get
return (Internals.repo state)
{- Changes the git repository being acted on. -}
gitRepoChange :: Git.Repo -> Annex ()
gitRepoChange r = do
state <- get
put state { Internals.repo = r }
{- Returns the backends being used. -}
backends :: Annex [Backend]
backends = do
state <- get
return (Internals.backends state)
{- Sets the backends to use. -}
backendsChange :: [Backend] -> Annex ()
backendsChange b = do
state <- get
put state { Internals.backends = b }
{- Returns the full list of supported backends. -}
supportedBackends :: Annex [Backend]
supportedBackends = do
state <- get
return (Internals.supportedBackends state)
{- Return True if a Bool flag is set. -}
flagIsSet :: FlagName -> Annex Bool
flagIsSet name = do
state <- get
case (M.lookup name $ Internals.flags state) of
Just (FlagBool True) -> return True
_ -> return False
{- Sets the value of a flag. -}
flagChange :: FlagName -> Flag -> Annex ()
flagChange name val = do
state <- get
put state { Internals.flags = M.insert name val $ Internals.flags state }
{- Gets the value of a String flag (or "" if there is no such String flag) -}
flagGet :: FlagName -> Annex String
flagGet name = do
state <- get
case (M.lookup name $ Internals.flags state) of
Just (FlagString s) -> return s
_ -> return ""
{- Adds a git command to the queue. -}
queue :: String -> [String] -> FilePath -> Annex ()
queue subcommand params file = do
state <- get
let q = Internals.repoqueue state
put state { Internals.repoqueue = GitQueue.add q subcommand params file }
{- Returns the queue. -}
queueGet :: Annex GitQueue.Queue
queueGet = do
state <- get
return (Internals.repoqueue state)
|
