CODEWITHSUNDEEP
macoshaskellterminalghcghci
roger
roger

Reputation: 71

(MacOS Command line) When using arrow keys to browse command history, previous commands concatenate, not deleting themselves

For context: I think I pressed something wrong while writing a command, but didn't pay much attention, then I noticed that if I went back with the up-arrow key, and then used the down-arrow key, the previous commands where concatenated:

(It may be important to note that this only happens using GHCi --Glasgow Haskell Compiler interactive environment)

% ghci
GHCi, version 8.10.7: https://www.haskell.org/ghc/  :? for help
Prelude> x = 2
Prelude> y = 2
Prelude> x + y
4
Prelude> x + y = x = y = x +

The last line was "written" using only the arrow keys, after using them a few times, they can't be deleted, but if I actually write something after it, the previous commands are ignored: for reference:

{} - concatenated unintentionally with arrow keys

[] - written by me

Prelude> {x + y = x} [2 + 2]
4

^the above, if written only by me, without using arrow keys, would've thrown an error.

Any help is greatly appreciated.

Upvotes: 1

Views: 190

Answers (1)

roger
roger

Reputation: 71

It turns that, quoting a member from the Function Programming Discord, "it's a known issue with haskeline (the library GHCi) uses that been fixed but needs to be back ported into GHC itself"

A workaround suggested by the same person is running TERM=dumb ghci

Upvotes: 1

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