lambda-options-haskell

A modern command-line parser for Haskell.

• Easy to use. The API is expressive.
• Easy to learn. The API is tiny and simple.
• BSD 1-Clause License

---

Basic example:

import System.Environment
import System.Exit
import Text.LambdaOptions

options :: Options IO ()
options = do
    addOption "--help" $ do
        putStrLn "--user NAME [AGE]"
    addOption "--user" $ \name -> do
        putStrLn $ "Name:" ++ name
    addOption "--user" $ \name age -> do
        putStrLn $ "Name:" ++ name ++ " Age:" ++ show (age :: Int)

main :: IO ()
main = do
    args <- getArgs
    mError <- runOptions options args
    case mError of
        Just (ParseFailed _ _ _) -> exitFailure
        Nothing -> exitSuccess