This commit is contained in:
Joey Hess 2012-11-18 18:27:53 -04:00
parent 81379bb29c
commit c8751be151
3 changed files with 22 additions and 31 deletions

View file

@ -125,21 +125,21 @@ storeChunked chunksize dests storer content =
- after each chunk of the L.ByteString, typically every 64 kb or so. -}
meteredWriteFile :: MeterUpdate -> FilePath -> L.ByteString -> IO ()
meteredWriteFile meterupdate dest b =
meteredWriteFileChunks meterupdate dest (L.toChunks b) feeder
where
feeder chunks = return ([], chunks)
meteredWriteFileChunks meterupdate dest [b] return
{- Writes a series of S.ByteString chunks to a file, updating a progress
- meter after each chunk. The feeder is called to get more chunks. -}
meteredWriteFileChunks :: MeterUpdate -> FilePath -> s -> (s -> IO (s, [S.ByteString])) -> IO ()
meteredWriteFileChunks meterupdate dest startstate feeder =
E.bracket (openFile dest WriteMode) hClose (feed startstate [])
{- Writes a series of major chunks to a file. The feeder is called to get
- each major chunk. Then each chunk of the L.ByteString is written,
- with the meter updated after each chunk. -}
meteredWriteFileChunks :: MeterUpdate -> FilePath -> [v] -> (v -> IO L.ByteString) -> IO ()
meteredWriteFileChunks meterupdate dest chunks feeder =
E.bracket (openFile dest WriteMode) hClose (feed chunks [])
where
feed state [] h = do
(state', cs) <- feeder state
unless (null cs) $
feed state' cs h
feed state (c:cs) h = do
S.hPut h c
meterupdate $ toInteger $ S.length c
feed state cs h
feed [] [] _ = noop
feed (c:cs) [] h = do
bs <- L.toChunks <$> feeder c
unless (null bs) $
feed cs bs h
feed cs (b:bs) h = do
S.hPut h b
meterupdate $ toInteger $ S.length b
feed cs bs h