Popularity
3.6
Declining
Activity
0.0
Stable
6
2
1

Monthly Downloads: 6
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags: Streaming     Streamly    

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README

streamly-cassava

Stream CSV data in\/out using Cassava. Adapted from streaming-cassava.

For efficiency, operates on streams of strict ByteString chunks (i.e. IsStream t => t m ByteString) rather than directly on streams of Word8. The chunkStream function is useful for generating an input stream from a handle.

Example usage:

import Streamly
import qualified Streamly.Prelude as S
import Streamly.Csv (decode, encode, chunkStream)
import System.IO
import qualified Data.Csv as Csv
import qualified Data.ByteString as BS
import Data.Vector (Vector)

main = do
  h <- openFile "testfile.csv" ReadMode
  let chunks = chunkStream h (64*1024)
      recs = decode Csv.HasHeader chunks :: SerialT IO (Vector BS.ByteString)
  withFile "dest.csv" WriteMode $ \ho ->
    S.mapM_ (BS.hPut ho) $ encode Nothing recs