Running interactive commands with haskell turtle library

Question

I am trying to run an interactive command with haskell turtle library like this:

#!/usr/bin/env stack
-- stack --install-ghc runghc --package turtle
{-# LANGUAGE OverloadedStrings #-}
import Turtle
main = procs "python" [] empty

(I also tried shells function but it does not work either.) When I run it nothing hapens:

$ ./turtleTest.hs
$

But if I change "python" command to "ls" it works.

How can I run an interactive command like python repl with turtle library?

You know about System.Process, right? Specifically callProcess "python" []. — ja.
– ja., Commented Nov 8, 2016 at 21:13
and in a turtle context: view $ liftIO $ callProcess "python" [] — ja.
– ja., Commented Nov 8, 2016 at 21:34
Or even better in Turtle (if you don't want to see the () being printed out after the interactive process exits): sh $ liftIO $ callProcess "python" [] — Jan Hrcek
– Jan Hrcek, Commented Jan 16, 2020 at 7:19

Jan Hrcek · Accepted Answer · 2020-01-16 07:24:00Z

2

Here's a complete working example extracted from comments. Tu run interactive process via Turtle you can do something like this:

#!/usr/bin/env stack
-- stack script --resolver lts-14.20 --package turtle --package process
{-# LANGUAGE OverloadedStrings #-}

import System.Process (callProcess)
import Turtle (sh, liftIO)

main :: IO ()
main = sh $ liftIO $ callProcess "python" []

answered Jan 16, 2020 at 7:24

Jan Hrcek

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2 Comments

Leo Over a year ago

Why not main = callProcess "python" [] directly?

Jan Hrcek Over a year ago

You could do that. But my usecase was to execute it withing the context of larger script which already contains Turtle's Shell actions.

Chris · Accepted Answer · 2022-07-05 05:23:11Z

0

{-# LANGUAGE OverloadedStrings #-}

import Turtle.Prelude (proc, procs, shell, shells)

main :: IO ()
main = do
  procs "ls" [] mempty         --(without ExitCode)
  procs "ls" ["-la"] mempty    --(without ExitCode)
  proc "pwd" [] mempty         --(with ExitCode)
  proc "ls" ["-la"] mempty     --(with ExitCode)

  shells "ls -la" mempty       --(without ExitCode)
  shell "pwd" mempty           --(with ExitCode)
  shell "ls -la" mempty        --(with ExitCode)

edited Jul 5, 2022 at 5:23

answered Jul 5, 2022 at 5:10

Chris

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