94 lines
2.3 KiB
Haskell
94 lines
2.3 KiB
Haskell
{- git-annex remote log
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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 RemoteLog (
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remoteLog,
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readRemoteLog,
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configSet,
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keyValToConfig,
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configToKeyVal,
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prop_idempotent_configEscape
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) where
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import qualified Data.Map as M
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import Data.Char
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import Annex.Common
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import qualified Annex.Branch
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import Types.Remote
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import UUID
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{- Filename of remote.log. -}
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remoteLog :: FilePath
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remoteLog = "remote.log"
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{- Adds or updates a remote's config in the log. -}
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configSet :: UUID -> RemoteConfig -> Annex ()
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configSet u c = Annex.Branch.change remoteLog $
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serialize . M.insert u c . remoteLogParse
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where
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serialize = unlines . sort . map toline . M.toList
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toline (u', c') = u' ++ " " ++ unwords (configToKeyVal c')
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{- Map of remotes by uuid containing key/value config maps. -}
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readRemoteLog :: Annex (M.Map UUID RemoteConfig)
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readRemoteLog = remoteLogParse <$> Annex.Branch.get remoteLog
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remoteLogParse :: String -> M.Map UUID RemoteConfig
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remoteLogParse s =
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M.fromList $ mapMaybe parseline $ filter (not . null) $ lines s
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where
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parseline l
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| length w > 2 = Just (u, c)
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| otherwise = Nothing
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where
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w = words l
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u = head w
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c = keyValToConfig $ tail w
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{- Given Strings like "key=value", generates a RemoteConfig. -}
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keyValToConfig :: [String] -> RemoteConfig
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keyValToConfig ws = M.fromList $ map (/=/) ws
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where
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(/=/) s = (k, v)
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where
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k = takeWhile (/= '=') s
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v = configUnEscape $ drop (1 + length k) s
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configToKeyVal :: M.Map String String -> [String]
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configToKeyVal m = map toword $ sort $ M.toList m
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where
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toword (k, v) = k ++ "=" ++ configEscape v
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configEscape :: String -> String
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configEscape = (>>= escape)
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where
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escape c
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| isSpace c || c `elem` "&" = "&" ++ show (ord c) ++ ";"
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| otherwise = [c]
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configUnEscape :: String -> String
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configUnEscape = unescape
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where
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unescape [] = []
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unescape (c:rest)
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| c == '&' = entity rest
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| otherwise = c : unescape rest
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entity s = if ok
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then chr (read num) : unescape rest
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else '&' : unescape s
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where
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num = takeWhile isNumber s
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r = drop (length num) s
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rest = drop 1 r
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ok = not (null num) &&
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not (null r) && head r == ';'
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{- for quickcheck -}
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prop_idempotent_configEscape :: String -> Bool
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prop_idempotent_configEscape s = s == (configUnEscape . configEscape) s
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