structured-cli

Haskell library for building structured CLI applications

This module provides the tools to build a complete "structured" CLI application, similar to those found in systems like Cisco IOS or console configuration utilities etc. It aims to be easy for implementors to use.

• How to use this module:

The following code illustrates a simple but complete CLI app:

import Control.Monad.IO.Class (liftIO)
import System.Console.StructuredCLI

root :: Commands ()
root = do
  world >+ do
    hello
    bye
    exit $ Just "return to previous level"

world :: Commands ()
world = command "world" (Just "enter into world") Nothing

hello :: Commands ()
hello = command "hello" (Just "prints a greeting") $ Just $ do
          liftIO . putStrLn $ "Hello world!"
          return 0

bye :: Commands ()
bye = command "bye" (Just "say goodbye") $ Just $ do
        liftIO . putStrLn $ "Sayonara!"
        return 0

main :: IO ()
main = runCLI "Hello CLI" Nothing root

resulting example session:

Hello CLI > ?
- world: enter into world
Hello CLI > world
Hello CLI world >
bye    exit   hello
Hello CLI world > hello
Hello world!
Hello CLI world > exit

A good way to get you started is to grab the example code available under example/Main.hs and modify it to suit your needs.