114 lines
3.9 KiB
Haskell
114 lines
3.9 KiB
Haskell
{- git-annex preferred content matcher configuration
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-
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- Copyright 2012 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 Logs.PreferredContent (
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preferredContentLog,
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preferredContentSet,
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isPreferredContent,
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preferredContentMap,
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preferredContentMapLoad,
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preferredContentMapRaw,
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checkPreferredContentExpression,
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setStandardGroup,
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) where
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import qualified Data.Map as M
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import qualified Data.Set as S
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import Data.Either
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import Data.Time.Clock.POSIX
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import Common.Annex
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import qualified Annex.Branch
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import qualified Annex
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import Logs.UUIDBased
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import Limit
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import qualified Utility.Matcher
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import Annex.FileMatcher
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import Annex.UUID
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import Types.Group
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import Logs.Group
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import Types.StandardGroups
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{- Filename of preferred-content.log. -}
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preferredContentLog :: FilePath
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preferredContentLog = "preferred-content.log"
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{- Changes the preferred content configuration of a remote. -}
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preferredContentSet :: UUID -> String -> Annex ()
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preferredContentSet uuid@(UUID _) val = do
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ts <- liftIO getPOSIXTime
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Annex.Branch.change preferredContentLog $
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showLog id . changeLog ts uuid val . parseLog Just
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Annex.changeState $ \s -> s { Annex.preferredcontentmap = Nothing }
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preferredContentSet NoUUID _ = error "unknown UUID; cannot modify"
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{- Checks if a file is preferred content for the specified repository
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- (or the current repository if none is specified). -}
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isPreferredContent :: Maybe UUID -> AssumeNotPresent -> FilePath -> Bool -> Annex Bool
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isPreferredContent mu notpresent file def = do
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u <- maybe getUUID return mu
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m <- preferredContentMap
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case M.lookup u m of
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Nothing -> return def
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Just matcher -> checkFileMatcher' matcher file notpresent def
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{- The map is cached for speed. -}
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preferredContentMap :: Annex Annex.PreferredContentMap
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preferredContentMap = maybe preferredContentMapLoad return
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=<< Annex.getState Annex.preferredcontentmap
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{- Loads the map, updating the cache. -}
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preferredContentMapLoad :: Annex Annex.PreferredContentMap
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preferredContentMapLoad = do
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groupmap <- groupMap
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m <- simpleMap
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. parseLogWithUUID ((Just .) . makeMatcher groupmap)
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<$> Annex.Branch.get preferredContentLog
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Annex.changeState $ \s -> s { Annex.preferredcontentmap = Just m }
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return m
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preferredContentMapRaw :: Annex (M.Map UUID String)
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preferredContentMapRaw = simpleMap . parseLog Just
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<$> Annex.Branch.get preferredContentLog
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{- This intentionally never fails, even on unparsable expressions,
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- because the configuration is shared amoung repositories and newer
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- versions of git-annex may add new features. Instead, parse errors
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- result in a Matcher that will always succeed. -}
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makeMatcher :: GroupMap -> UUID -> String -> FileMatcher
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makeMatcher groupmap u s
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| s == "standard" = standardMatcher groupmap u
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| null (lefts tokens) = Utility.Matcher.generate $ rights tokens
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| otherwise = matchAll
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where
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tokens = map (parseToken (limitPresent $ Just u) groupmap) (tokenizeMatcher s)
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{- Standard matchers are pre-defined for some groups. If none is defined,
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- or a repository is in multiple groups with standard matchers, match all. -}
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standardMatcher :: GroupMap -> UUID -> FileMatcher
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standardMatcher m u = maybe matchAll (makeMatcher m u . preferredContent) $
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getStandardGroup =<< u `M.lookup` groupsByUUID m
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{- Checks if an expression can be parsed, if not returns Just error -}
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checkPreferredContentExpression :: String -> Maybe String
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checkPreferredContentExpression s
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| s == "standard" = Nothing
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| otherwise = case parsedToMatcher vs of
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Left e -> Just e
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Right _ -> Nothing
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where
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vs = map (parseToken (limitPresent Nothing) emptyGroupMap)
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(tokenizeMatcher s)
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{- Puts a UUID in a standard group, and sets its preferred content to use
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- the standard expression for that group, unless something is already set. -}
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setStandardGroup :: UUID -> StandardGroup -> Annex ()
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setStandardGroup u g = do
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groupSet u $ S.singleton $ fromStandardGroup g
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m <- preferredContentMap
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unless (isJust $ M.lookup u m) $
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preferredContentSet u "standard"
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