[Haskell-beginners] command-line interaction with running process

[emacstheviking]

I did something similar a while back using a socket based "terminal
session" into an OpenGL program so I could change things as it ran.

It's viable. I used TVar I think and didn't encounter any issues.
Sadly, the code has vanished but it worked well and wasn't that much code
actually thanks to the libraries being good.


On 4 March 2015 at 09:32, Elise Huard <haskell at elisehuard.be> wrote:

> Hi,
>
> I'm trying to do the following: implementing a command-line interface
> to directly interact with the state or the parameters of a
> looping/running process (a game, to be specific).
>
> My first thought is to fork a thread, passing in a TChan/TVar or
> similar to enable communication, and to have the command-line
> interface on the thread (getLine or haskelline ...).
> Another option would be to have a bona fide server-client interface
> (with sockets or others), to fork a thread again to run the server and
> to connect using the client library - which would allow me to use ghci
> and have transparent serialization under the hood.
>
> Are there known use cases?  Am I missing something, for instance is it
> possible to interact with a running process directly using ghci?
> Any tips?
>
> Thank you,
>
> Elise
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