Why

This gulp plugin allows to use the Haste compiler to produce Requirejs modules from Haskell programs. You can export only one function at the moment.

Prerequisites

npm install gulp-haste

 
haste = require('gulp-haste');
 
gulp.src("*.hs")
    .pipe(haste(options))
    .pipe(gulp.dest("build"));

where options is an optional hash. If you omit options, the Haskell's function exported is just main.

var options = {
   export: true;
   withJs: "file.js"
}

export=true specifies that the whole set of FFI exported functions should be made available when requiring the module;
withJs includes the specified file in the prologue of the compiled program.

The code below FFI exports one function, which will be available by requiring the module:

import Haste.Foreign
 
myFunction:: Int -> IO Bool
myFunction _ = return True
 
main = do 
    export "name_of_haskell_function" myFunction

In order to load this function javascript-side:

myHaskellFunction = require('converted_by_hastec').name_of_haskell_function