19 lines
439 B
Haskell
19 lines
439 B
Haskell
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module Main where
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import qualified Data.ByteString.Char8 as ByteString
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import MiniJson.Greeting (greetFromJson)
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import System.Environment (getArgs)
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import System.Exit (die)
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main :: IO ()
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main = do
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args <- getArgs
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let input =
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case args of
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[] -> "{\"name\":\"learner\"}"
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firstArg : _ -> firstArg
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case greetFromJson (ByteString.pack input) of
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Left err -> die err
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Right message -> putStrLn message
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