sbp-0.51.2: main/SBP2JSON.hs

-- |
-- Module:      SBP2JSON
-- Copyright:   Copyright (C) 2015 Swift Navigation, Inc.
-- License:     LGPL-3
-- Maintainer:  Mark Fine <dev@swiftnav.com>
-- Stability:   experimental
-- Portability: portable
--
-- SBP to JSON tool - reads SBP binary from stdin and sends SBP JSON
-- to stdout.

import           BasicPrelude
import           Control.Monad.Trans.Resource
import           Data.Aeson
import           Data.Aeson.Encode
import           Data.ByteString.Builder
import qualified Data.ByteString.Lazy as BL
import           Data.Conduit
import           Data.Conduit.Binary
import qualified Data.Conduit.List as CL
import           Data.Conduit.Serialization.Binary
import           SwiftNav.SBP
import           System.IO

-- | Encode a SBPMsg to a line of JSON.
encodeLine :: SBPMsg -> ByteString
encodeLine v = BL.toStrict $ toLazyByteString $
  encodeToByteStringBuilder (toJSON v) <> "\n"

main :: IO ()
main = runResourceT $
  sourceHandle stdin =$=
  conduitDecode =$=
  CL.map encodeLine $$
  sinkHandle stdout