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