Here's a simple example

module Main (main) where

import Control.Monad (unless)
import Env

data Hello = Hello { name :: String, quiet :: Bool }

hello :: IO Hello
hello = Env.parse (header "envparse example") $
  Hello <$> var (str <=< nonempty) "NAME"  (help "Target for the greeting")
        <*> switch                 "QUIET" (help "Whether to actually print the greeting")
 
main :: IO ()
main = do
  Hello { name, quiet } <- hello
  unless quiet $
    putStrLn ("Hello, " ++ name ++ "!")

---

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