How do I clear the terminal screen in Haskell?

Question

How can I clear a terminal screen after my user has selected an option from my application's menu?

Answer 1

Just press Ctrl+L (works on Windows)

Answer 2

On Windows, use Ctrl + L for Haskell command prompt terminal. And, for GUI use Ctrl + S.

Answer 3

A quick way on Windows would be to

import System.Process

clear :: IO ()
clear = system "cls"

Answer 4

On a terminal that understands ANSI escape sequences (I believe every term in Unix/Linux systems) you can do it simply with:

clear = putStr "\ESC[2J"

The 2 clears the entire screen. You can use 0 or 1 respectively if you want to clear from the cursor to end of screen or from cursor to the beginning of the screen.

However I don't think this works in the Windows shell.

Answer 5

:! run the shell command
:! cls under windows
:! clear under linux and OS X

Answer 6

This is what you may be looking for:

ansi-terminal: Simple ANSI terminal support, with Windows compatibility

You can find it in Hackage and install using cabal install ansi-terminal. It specifically has functions for clearing the screen, displaying colors, moving the cursor, etc.

Using it to clear the screen is easy: (this is with GHCI)

import System.Console.ANSI

clearScreen