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|
{- user-specified limits on files to act on
-
- Copyright 2011 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Limit where
import Text.Regex.PCRE.Light.Char8
import System.Path.WildMatch
import Control.Applicative
import Data.Maybe
import Annex
import qualified Utility.Matcher
import qualified Remote
import qualified Backend
import LocationLog
import Utility
import Content
type Limit = Utility.Matcher.Token (FilePath -> Annex Bool)
{- Checks if there are user-specified limits. -}
limited :: Annex Bool
limited = (not . Utility.Matcher.matchesAny) <$> getMatcher'
{- Gets a matcher for the user-specified limits. The matcher is cached for
- speed; once it's obtained the user-specified limits can't change. -}
getMatcher :: Annex (FilePath -> Annex Bool)
getMatcher = Utility.Matcher.matchM <$> getMatcher'
getMatcher' :: Annex (Utility.Matcher.Matcher (FilePath -> Annex Bool))
getMatcher' = do
m <- Annex.getState Annex.limit
case m of
Right r -> return r
Left l -> do
let matcher = Utility.Matcher.generate (reverse l)
Annex.changeState $ \s -> s { Annex.limit = Right matcher }
return matcher
{- Adds something to the limit list, which is built up reversed. -}
add :: Limit -> Annex ()
add l = Annex.changeState $ \s -> s { Annex.limit = prepend $ Annex.limit s }
where
prepend (Left ls) = Left $ l:ls
prepend _ = error "internal"
{- Adds a new limit. -}
addlimit :: (FilePath -> Annex Bool) -> Annex ()
addlimit = add . Utility.Matcher.Operation
{- Adds a new token. -}
token :: String -> Annex ()
token = add . Utility.Matcher.Token
{- Add a limit to skip files that do not match the glob. -}
addExclude :: String -> Annex ()
addExclude glob = addlimit $ return . notExcluded
where
notExcluded f = isNothing $ match cregex f []
cregex = compile regex []
regex = '^':wildToRegex glob
{- Adds a limit to skip files not believed to be present
- in a specfied repository. -}
addIn :: String -> Annex ()
addIn name = do
u <- Remote.nameToUUID name
addlimit $ if name == "." then check local else check (remote u)
where
check a f = Backend.lookupFile f >>= handle a
handle _ Nothing = return False
handle a (Just (key, _)) = a key
remote u key = do
us <- keyLocations key
return $ u `elem` us
local key = inAnnex key
{- Adds a limit to skip files not believed to have the specified number
- of copies. -}
addCopies :: String -> Annex ()
addCopies num = do
case readMaybe num :: Maybe Int of
Nothing -> error "bad number for --copies"
Just n -> addlimit $ check n
where
check n f = Backend.lookupFile f >>= handle n
handle _ Nothing = return False
handle n (Just (key, _)) = do
us <- keyLocations key
return $ length us >= n
|
