knob

Memory-backed handles

https://john-millikin.com/software/knob/

Version on this page:	0.1.1
LTS Haskell 23.19:	0.2.2@rev:1
Stackage Nightly 2025-04-24:	0.2.2@rev:1
Latest on Hackage:	0.2.2@rev:1

See all snapshots knob appears in

MIT licensed and maintained by John Millikin

This version can be pinned in stack with:knob-0.1.1@sha256:8dd62f0470fd829d5c4137b5ecfb0cb9a04a829fa8f436959d460019b3a6f118,1401

Module documentation for 0.1.1

Data
- Data.Knob

Depends on 3 packages(full list with versions):

base, bytestring, transformers

Create memory-backed Handles, referencing virtual files. This is mostly useful for testing Handle-based APIs without having to interact with the filesystem.

import Data.ByteString (pack)
import Data.Knob
import System.IO

main = do
    knob <- newKnob (pack [])
    h <- newFileHandle knob "test.txt" WriteMode
    hPutStrLn h "Hello world!"
    hClose h
    bytes <- Data.Knob.getContents knob
    putStrLn ("Wrote bytes: " ++ show bytes)