Sometimes when writing a quick and dirty console program, you may want to
ask the user for a bit more structured input than just a plain getLine,
but reaching for brick or
ncurses is just overkill.
This package is a collection of convenience functions for such occasions.
Example usage:
import Data.Char (toUpper, toLower)
import System.Console.Ask
main = do
name <- ask (Just "John Doe") "What is your name?"
name_confirmed <- confirm False ("Is your name *really* " ++ name ++ "?")
if not name_confirmed
then putStrLn "OK, let's start over then." >> main
else greet name
greet name = do
preferred_name <- chooseOne "Which do you prefer?"
[ ("Uppercase", map toUpper name)
, ("Lowercase", map toLower name)
, ("Neither", name)
]
putStrLn $ "Hello " ++ preferred_name ++ ", nice to meet you!"