cassava-0.5.5.0: examples/NamedBasedExplicitDecode.hs

{-# LANGUAGE OverloadedStrings #-}

import qualified Data.ByteString.Lazy as BL
import Data.Csv
import qualified Data.Vector as V

data Person = Person
    { name   :: String
    , salary :: Int
    }

valueParse :: NamedRecord -> Parser Person
valueParse r = Person <$> r .: "name" <*> r .: "salary"

main :: IO ()
main = do
    csvData <- BL.readFile "salaries.csv"
    case decodeByNameWithP valueParse defaultDecodeOptions csvData of
        Left err -> putStrLn err
        Right (_, v) -> V.forM_ v $ \ p ->
            putStrLn $ name p ++ " earns " ++ show (salary p) ++ " dollars"