43 lines
1.1 KiB
Haskell
43 lines
1.1 KiB
Haskell
{-# LANGUAGE TypeApplications #-}
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module Control.Addressbook.Query where
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import Data.Text
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(Text)
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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.Text as CT
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import System.IO
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(stdout)
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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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import Control.Exception
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(catch)
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-- XXX: The current Data.Trie implementation is much slower than Data.Set
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query :: Text -> IO ()
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query prefix = do
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datDir <- fromMaybe "./" <$> lookupEnv "HOME"
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catch @IOError (runResourceT $ runConduit $ filterAddresses datDir) $ \e -> print e
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where
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prefixLC = T.toLower prefix
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filterAddresses :: FilePath -> ConduitT () Void (ResourceT IO) ()
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filterAddresses dir =
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CB.sourceFile (dir </> ".addressbook.dat")
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.| CT.decode CT.utf8
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.| CT.lines
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.| C.filter (\v -> prefixLC `T.isPrefixOf` T.toLower v)
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.| CT.encode CT.utf8
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.| C.map (<> "\n")
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.| CB.sinkHandle stdout
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