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purescript-simple-repl's Introduction

purescript-simple-repl Build Status

If it doesn't work, try throwing Aff at it

Usage

By example:

import Node.ReadLine (READLINE)
import Node.SimpleRepl (setPrompt, readLine, runRepl, putStrLn)

main :: forall e. Eff (console :: CONSOLE, readline :: READLINE | e) Unit
main = runRepl do
  setPrompt "> "
  putStrLn "THE DRAMATIC REPL"
  putStrLn ":Q TO QUIT"
  loop
  where
    loop = do
      res <- readLine
      case res of
           ":q" -> pure unit
           ":Q" -> pure unit
           _ -> do
             putStrLn $ toUpper res <> "!!!"
             loop

The main draw of this library is the readLine :: forall e. Repl e String function.

The point was to make it possible to do something akin to Haskell's getLine :: IO String, since otherwise using just the barebones purescript-node-readline library, user input is handled in a callback that takes the input as its parameter.

Installing

bower i purescript-simple-repl

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