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{- git-annex preferred content matcher configuration
-
- Copyright 2012 Joey Hess <joey@kitenet.net>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Logs.PreferredContent (
preferredContentSet,
preferredContentMap,
preferredContentMapRaw,
checkPreferredContentExpression,
) where
import qualified Data.Map as M
import Data.Either
import Data.Time.Clock.POSIX
import Common.Annex
import qualified Annex.Branch
import qualified Annex
import Logs.UUIDBased
import Limit (MatchFiles, limitInclude, limitExclude, limitIn, limitCopies, limitInBackend)
import qualified Utility.Matcher
{- Filename of preferred-content.log. -}
preferredContentLog :: FilePath
preferredContentLog = "preferred-content.log"
{- Changes the preferred content configuration of a remote. -}
preferredContentSet :: UUID -> String -> Annex ()
preferredContentSet uuid@(UUID _) val = do
ts <- liftIO getPOSIXTime
Annex.Branch.change preferredContentLog $
showLog id . changeLog ts uuid val . parseLog Just
Annex.changeState $ \s -> s { Annex.groupmap = Nothing }
preferredContentSet NoUUID _ = error "unknown UUID; cannot modify"
{- Read the preferredContentLog into a map. The map is cached for speed. -}
preferredContentMap :: Annex Annex.PreferredContentMap
preferredContentMap = do
cached <- Annex.getState Annex.preferredcontentmap
case cached of
Just m -> return m
Nothing -> do
m <- simpleMap . parseLog (Just . makeMatcher)
<$> Annex.Branch.get preferredContentLog
Annex.changeState $ \s -> s { Annex.preferredcontentmap = Just m }
return m
preferredContentMapRaw :: Annex (M.Map UUID String)
preferredContentMapRaw = simpleMap . parseLog Just
<$> Annex.Branch.get preferredContentLog
{- This intentionally never fails, even on unparsable expressions,
- because the configuration is shared amoung repositories and newer
- versions of git-annex may add new features. Instead, parse errors
- result in a Matcher that will always succeed. -}
makeMatcher :: String -> Utility.Matcher.Matcher MatchFiles
makeMatcher s
| null (lefts tokens) = Utility.Matcher.generate $ rights tokens
| otherwise = Utility.Matcher.generate []
where
tokens = map parseToken $ tokenizeMatcher s
{- Checks if an expression can be parsed, if not returns Just error -}
checkPreferredContentExpression :: String -> Maybe String
checkPreferredContentExpression s = case lefts $ map parseToken $ tokenizeMatcher s of
[] -> Nothing
l -> Just $ unwords $ map ("Parse failure: " ++) l
parseToken :: String -> Either String (Utility.Matcher.Token MatchFiles)
parseToken t
| any (== t) Utility.Matcher.tokens = Right $ Utility.Matcher.token t
| otherwise = maybe (Left $ "near " ++ show t) use $ M.lookup k m
where
(k, v) = separate (== '=') t
m = M.fromList
[ ("include", limitInclude)
, ("exclude", limitExclude)
, ("in", limitIn)
, ("copies", limitCopies)
, ("backend", limitInBackend)
]
use a = Utility.Matcher.Operation <$> a v
{- This is really dumb tokenization; there's no support for quoted values.
- Open and close parens are always treated as standalone tokens;
- otherwise tokens must be separated by whitespace. -}
tokenizeMatcher :: String -> [String]
tokenizeMatcher = filter (not . null ) . concatMap splitparens . words
where
splitparens = segmentDelim (`elem` "()")
|
