https://github.com/sdiehl/haskell-linenoise

Lightweight readline library for Haskell
https://github.com/sdiehl/haskell-linenoise

haskell linenoise readline

Last synced: about 2 months ago
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Lightweight readline library for Haskell

• Host: GitHub
• URL: https://github.com/sdiehl/haskell-linenoise
• Owner: sdiehl
• License: bsd-2-clause
• Created: 2014-09-30T03:05:31.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2017-11-22T15:24:56.000Z (about 7 years ago)
• Last Synced: 2023-03-11T04:30:00.612Z (almost 2 years ago)
• Topics: haskell, linenoise, readline
• Language: C
• Size: 23.4 KB
• Stars: 10
• Watchers: 2
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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----

[![Build Status](https://travis-ci.org/sdiehl/haskell-linenoise.svg?branch=master)](https://travis-ci.org/sdiehl/haskell-linenoise)

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.

```haskell

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 defaultSettings

```

Can compose with the regular State monad, for instance to do stateful tab completion. Something which is

painful with Haskeline.

```haskell

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) []

```

License

-------

Includes the source code for linenoise. Released under the BSD license.

Copyright (c) 2014-2017, Stephen Diehl