silently
Prevent or capture writing to stdout and other handles.
https://github.com/hspec/silently
| Version on this page: | 1.2.5.3 |
| LTS Haskell 24.16: | 1.2.5.4 |
| Stackage Nightly 2025-10-25: | 1.2.5.4 |
| Latest on Hackage: | 1.2.5.4 |
Maintained by Sönke Hahn, Simon Hengel, Andreas Abel
This version can be pinned in stack with:
silently-1.2.5.3@sha256:a5f7b48a0f5227ae649b7076eef357b0cd4d60e35454eaef8957b475ce4b34ce,2399Module documentation for 1.2.5.3
- System
- System.IO
Depends on 3 packages(full list with versions):
Used by 5 packages in nightly-2022-09-30(full list with versions):
silently
Silently is a package that allows you to run an IO action and
prevent it from writing to stdout, or any other handle, by using
silence. Or you can capture the output for yourself using capture.
For example, the program
import System.IO.Silently
main = do
putStr "putStrLn: " >> putStrLn "puppies!"
putStr "silenced: " >> silence (putStrLn "kittens!")
putStrLn ""
(captured, result) <- capture (putStr "wookies!" >> return 123)
putStr "captured: " >> putStrLn captured
putStr "returned: " >> putStrLn (show result)
will print:
putStrLn: puppies!
silenced:
captured: wookies!
returned: 123
Limitations
Capturing/silencing might not work as expected if the action uses the FFI
or conceals output under unsafePerformIO or similar unsafe operations.
Examples:
- FFI: https://github.com/hspec/silently/issues/3
unsafePerformIO: https://github.com/bos/filemanip/issues/22