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|
{- git-annex command
-
- Copyright 2014-2016 Joey Hess <id@joeyh.name>
-
- Licensed under the GNU GPL version 3 or higher.
-}
module Command.MetaData where
import Command
import Annex.MetaData
import Annex.VectorClock
import Logs.MetaData
import Annex.WorkTree
import Messages.JSON (JSONActionItem(..))
import Types.Messages
import qualified Data.Set as S
import qualified Data.Map as M
import qualified Data.Text as T
import qualified Data.ByteString.Lazy.UTF8 as BU
import Data.Aeson
import Control.Concurrent
cmd :: Command
cmd = withGlobalOptions ([jsonOption] ++ annexedMatchingOptions) $
command "metadata" SectionMetaData
"sets or gets metadata of a file"
paramPaths (seek <$$> optParser)
data MetaDataOptions = MetaDataOptions
{ forFiles :: CmdParams
, getSet :: GetSet
, keyOptions :: Maybe KeyOptions
, batchOption :: BatchMode
}
data GetSet = Get MetaField | GetAll | Set [ModMeta]
optParser :: CmdParamsDesc -> Parser MetaDataOptions
optParser desc = MetaDataOptions
<$> cmdParams desc
<*> ((Get <$> getopt) <|> (Set <$> some modopts) <|> pure GetAll)
<*> optional parseKeyOptions
<*> parseBatchOption
where
getopt = option (eitherReader mkMetaField)
( long "get" <> short 'g' <> metavar paramField
<> help "get single metadata field"
)
modopts = option (eitherReader parseModMeta)
( long "set" <> short 's' <> metavar "FIELD[+-]=VALUE"
<> help "set or unset metadata value"
)
<|> (AddMeta tagMetaField . toMetaValue <$> strOption
( long "tag" <> short 't' <> metavar "TAG"
<> help "set a tag"
))
<|> (DelMeta tagMetaField . Just . toMetaValue <$> strOption
( long "untag" <> short 'u' <> metavar "TAG"
<> help "remove a tag"
))
<|> option (eitherReader (\f -> DelMeta <$> mkMetaField f <*> pure Nothing))
( long "remove" <> short 'r' <> metavar "FIELD"
<> help "remove all values of a field"
)
seek :: MetaDataOptions -> CommandSeek
seek o = case batchOption o of
NoBatch -> do
c <- liftIO currentVectorClock
let seeker = case getSet o of
Get _ -> withFilesInGit
GetAll -> withFilesInGit
Set _ -> withFilesInGitNonRecursive
"Not recursively setting metadata. Use --force to do that."
withKeyOptions (keyOptions o) False
(startKeys c o)
(seeker $ whenAnnexed $ start c o)
(forFiles o)
Batch -> withMessageState $ \s -> case outputType s of
JSONOutput _ -> batchInput parseJSONInput $
commandAction . startBatch
_ -> giveup "--batch is currently only supported in --json mode"
start :: VectorClock -> MetaDataOptions -> FilePath -> Key -> CommandStart
start c o file k = startKeys c o k (mkActionItem afile)
where
afile = AssociatedFile (Just file)
startKeys :: VectorClock -> MetaDataOptions -> Key -> ActionItem -> CommandStart
startKeys c o k ai = case getSet o of
Get f -> do
l <- S.toList . currentMetaDataValues f <$> getCurrentMetaData k
liftIO $ forM_ l $
putStrLn . fromMetaValue
stop
_ -> do
showStart' "metadata" k ai
next $ perform c o k
perform :: VectorClock -> MetaDataOptions -> Key -> CommandPerform
perform c o k = case getSet o of
Set ms -> do
oldm <- getCurrentMetaData k
let m = combineMetaData $ map (modMeta oldm) ms
addMetaData' k m c
next $ cleanup k
_ -> next $ cleanup k
cleanup :: Key -> CommandCleanup
cleanup k = do
m <- getCurrentMetaData k
let Object o = toJSON (MetaDataFields m)
maybeShowJSON $ AesonObject o
showLongNote $ unlines $ concatMap showmeta $
map unwrapmeta (fromMetaData m)
return True
where
unwrapmeta (f, v) = (fromMetaField f, map fromMetaValue (S.toList v))
showmeta (f, vs) = map ((f ++ "=") ++) vs
-- Metadata serialized to JSON in the field named "fields" of
-- a larger object.
newtype MetaDataFields = MetaDataFields MetaData
deriving (Show)
instance ToJSON MetaDataFields where
toJSON (MetaDataFields m) = object [ (fieldsField, toJSON m) ]
instance FromJSON MetaDataFields where
parseJSON (Object v) = do
f <- v .: fieldsField
case f of
Nothing -> return (MetaDataFields emptyMetaData)
Just v' -> MetaDataFields <$> parseJSON v'
parseJSON _ = fail "expected an object"
fieldsField :: T.Text
fieldsField = T.pack "fields"
parseJSONInput :: String -> Either String (Either FilePath Key, MetaData)
parseJSONInput i = do
v <- eitherDecode (BU.fromString i)
let m = case itemAdded v of
Nothing -> emptyMetaData
Just (MetaDataFields m') -> m'
case (itemKey v, itemFile v) of
(Just k, _) -> Right (Right k, m)
(Nothing, Just f) -> Right (Left f, m)
(Nothing, Nothing) -> Left "JSON input is missing either file or key"
startBatch :: (Either FilePath Key, MetaData) -> CommandStart
startBatch (i, (MetaData m)) = case i of
Left f -> do
mk <- lookupFile f
case mk of
Just k -> go k (mkActionItem (AssociatedFile (Just f)))
Nothing -> giveup $ "not an annexed file: " ++ f
Right k -> go k (mkActionItem k)
where
go k ai = do
showStart' "metadata" k ai
let o = MetaDataOptions
{ forFiles = []
, getSet = if MetaData m == emptyMetaData
then GetAll
else Set $ map mkModMeta (M.toList m)
, keyOptions = Nothing
, batchOption = NoBatch
}
t <- liftIO currentVectorClock
-- It would be bad if two batch mode changes used exactly
-- the same timestamp, since the order of adds and removals
-- of the same metadata value would then be indeterminate.
-- To guarantee that never happens, delay 1 microsecond,
-- so the timestamp will always be different. This is
-- probably less expensive than cleaner methods,
-- such as taking from a list of increasing timestamps.
liftIO $ threadDelay 1
next $ perform t o k
mkModMeta (f, s)
| S.null s = DelMeta f Nothing
| otherwise = SetMeta f s
|
