[Haskell-cafe] Intercept stdin in Haskell

Carter Schonwald carter.schonwald at gmail.com
Sun Jan 5 19:52:01 UTC 2014

Hrm.  Have you considered using the ghc API? Ghci itself is written using
it, and I imagine you could adapt that code for your purposes perhaps?

On Sunday, January 5, 2014, Andrew Gibiansky wrote:

> I cannot modify the Haskell code.
> I am working on IHaskell - it is effectively a Haskell interpreter. It
> reads some code from the user, which may contain something like `getLine`.
> However, the frontend to the interpreter is not a shell but is a GUI in the
> web browser (IPython!). In order to do input, the interpreter sends a
> message to the frontend via the network saying "give me input", the
> frontend reads some input, and then sends things back.
> In order to do this communication, I need to know when the getLine is
> called so that I know I need to send the message to the frontend.
> Ideas? The thing is, getLine needs to not actually read from any shell -
> it will read from a pipe I create, and I simply need to know when to put
> stuff into that pipe.
> -- Andrew
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