Import files.

.gitignore

@@ -1,16 +1,7 @@
 dist
-cabal-dev
-*.o
-*.hi
-*.chi
-*.chs.h
-*.dyn_o
-*.dyn_hi
-.virtualenv
-.hpc
-.hsenv
-.cabal-sandbox/
-cabal.sandbox.config
-*.prof
-*.aux
-*.hp
+*hi
+*o
+*.jsexe
+*~
+.#*
+\#*#

README.md

@@ -1,2 +1,25 @@
-# ghcjs-node-minimal
+# Haskell + Node.js Minimal Sample
 Demonstrates a minimal code to produce a working (JavaScript only) nodejs application, also showing off how to depend on other nodejs modules.
+
+## Basic test, no JS specific stuff.
+This is easily done following the ghcjs doc, the Usage section:
+https://github.com/ghcjs/ghcjs
+
+Create a standard Haskell executable project with cabal.
+
+Create a Main.hs module, put a basic Hello World output into main.
+
+Build with: ghcjs -o hello src/Main.hs
+
+Test with: node hello.jsexe/all.js
+
+## Now make JavaScript calls via FFI
+Just import a standard node module and call a function like this in JavaScript:
+
+var os = require("os");
+console.log(os.hostname());
+
+Inspiration from:
+http://weblog.luite.com/wordpress/
+https://nodejs.org/api/os.html
+

Setup.hs

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+import Distribution.Simple
+main = defaultMain

ghcjs-nodejs-hello.cabal

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+-- Initial ghcjs-nodejs-hello.cabal generated by cabal init.  For further 
+-- documentation, see http://haskell.org/cabal/users-guide/
+
+name:                ghcjs-node-minimal
+version:             0.1.0.0
+synopsis:            Demonstrates a minimal code to produce a working (JavaScript only)
+                     nodejs application, also showing off how to depend on other nodejs
+                     modules.
+-- description:         
+homepage:            github
+license:             GPL-3
+license-file:        LICENSE
+author:              Martin Vlk
+maintainer:          [email protected]
+-- copyright:           
+category:            Development
+build-type:          Simple
+-- extra-source-files:  
+cabal-version:       >=1.10
+
+executable ghcjs-node-minimal
+  main-is:             Main.hs
+  -- other-modules:     
+  -- other-extensions:  
+  build-depends:       base >=4.8 && <4.9
+  hs-source-dirs:      src
+  default-language:    Haskell2010

src/Main.hs

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+{-# 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) ++ "'"