lambda-options: A modern command-line parser for Haskell.

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A modern command-line parser for Haskell.

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Dependencies base (>=4.7 && <4.8), containers (>=0.5 && <0.6), mtl (>=2.2 && <2.3) [details]
License LicenseRef-OtherLicense
Author Thomas Eding
Category Text
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Uploaded by ThomasEding at 2015-05-17T00:15:32Z
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Downloads 10248 total (83 in the last 30 days)
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Readme for lambda-options-

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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 Text.LambdaOptions

options :: Options IO ()
options = do
    addOption (kw ["--help", "-h"] `text` "Display this help text.") $ \(HelpDescription desc) -> do
        putStrLn "Usage:"
        putStrLn desc
    addOption (kw "--user" `argText` "NAME" `text` "Prints name.") $ \name -> do
        putStrLn $ "Name:" ++ name
    addOption (kw "--user" `argText` "NAME AGE" `text` "Prints name and age.") $ \name age -> do
        putStrLn $ "Name:" ++ name ++ " Age:" ++ show (age :: Int)

main :: IO ()
main = do
    args <- getArgs
    result <- runOptions options args
    case result of
        Left (ParseFailed msg _ _) -> do
            putStrLn msg
            desc <- getHelpDescription options
            putStrLn desc
        Right action -> action