53 lines
1.3 KiB
Haskell
53 lines
1.3 KiB
Haskell
module Control.Addressbook.Streaming where
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import qualified Data.Text as T
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import Conduit
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import qualified Data.Conduit.Binary as CB
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import qualified Data.Conduit.Combinators as C
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import qualified Data.Conduit.List as CL
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import qualified Data.Conduit.Text as CT
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import Data.Email
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import Data.Email.Header
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(Header(..))
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import System.IO
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(stdin)
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import qualified Data.Foldable as F
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import qualified Data.Trie as Trie
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import Data.Maybe
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(fromMaybe)
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import System.Environment
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(lookupEnv)
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import System.FilePath
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((</>))
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combine :: (MonadUnliftIO m, MonadResource m, MonadThrow m, MonadIO m) => ConduitM FilePath Header m ()
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combine = await >>= \case
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Nothing -> pure ()
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Just path -> (CB.sourceFile path .| parseEmail) >> combine
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run :: IO ()
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run = do
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datDir <- fromMaybe "./" <$> lookupEnv "HOME"
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runResourceT $ do
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x <- runConduit stream
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runConduit (CL.sourceList (Trie.keys x) .| C.map (<> "\n") .| CB.sinkFileCautious (datDir </> ".addressbook.dat"))
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where
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separate = \case
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From x -> [x]
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To xs -> F.toList xs
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stream =
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CB.sourceHandle stdin
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.| CT.decode CT.utf8
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.| CT.lines
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.| C.map T.unpack
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.| combine
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.| C.concatMap separate
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.| CT.encode CT.utf8
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.| C.foldMap (`Trie.singleton` ())
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