Initial work on a lightweight readline library for Haskell based on the linenoise library. Designed from
the ground up to work more smoothly with modern monad transformers and exceptions libraries.
import System.Console.Repl
type Repl = ReplT IO
completer :: String -> [String]
completer ('h':_) = ["hello", "hello there"]
completer _ = []
repl :: Repl ()
repl = replM ">>> " outputStrLn completer
main :: IO ()
main = runRepl repl defaultSettingsCan compose with the regular State monad, for instance to do stateful tab completion. Something which is painful with Haskeline.
import System.Console.Repl
import Control.Monad.State.Strict
import Data.List (isPrefixOf)
type Repl = ReplT (StateT [String] IO)
completer :: String -> Repl [String]
completer line = do
comps <- get
return $ filter (isPrefixOf line) comps
action :: String -> Repl ()
action x = do
modify $ (x:)
liftIO $ putStrLn x
repl :: Repl ()
repl = replM ">>> " action (byWord completer)
main :: IO ()
main = evalStateT (runRepl repl defaultSettings) []Includes the source code for linenoise. Released under the BSD license.
Copyright (c) 2014-2017, Stephen Diehl