Re: [Haskell-beginners] Haskell -> JavaScript -> nodejs

Thanks, in the end I was able to figure it out, here is the code: (https://github.com/martinvlk/ghcjs-node-minimal) {-# LANGUAGE JavaScriptFFI, OverloadedStrings #-} module Main (main) where import GHCJS.Types import GHCJS.Foreign foreign import javascript unsafe "require($1)" require :: JSString -> IO (JSRef a) foreign import javascript unsafe "$1.hostname()" hostname :: JSRef a -> IO JSString main :: IO () main = require "os" >>= hostname >>= \h -> putStrLn $ "Our hostname is '" ++ (fromJSString h) ++ "'" Martin Sumit Sahrawat, Maths & Computing, IIT (BHU):

Better try on the cafe. cc-ing.

On 20 June 2015 at 15:26, Martin Vlk wrote:

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I made some progress - in order for Haskell modules to work with ghcjs you need to use cabal with the --ghcjs flag to install them.

Martin

Martin Vlk:

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Hi, I can successfully compile a basic Hello World into JavaScript with ghcjs and run it with nodejs. But what I ultimately need to do is write a nodejs module in Haskell and compile down to JavaScript with ghcjs. I need to be able to require other nodejs modules as well.

Could somebody point me in the right direction? E.g. what approach and libraries to use...

I have tried a simple thing with jsaddle/lens, but when I try to compile with ghcjs it is not finding the imported modules, even though when compiling with ghc it does find them (they are installed using cabal).

Many Thanks Martin

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