A Haskell library wrapper around the Elm executable, to build files from within Haskell.

For more information on Elm, see http://elm-lang.org.

There are two main steps to using this library: converting Elm source to a Module structure, then compiling various modules.

To compile a string to a module, simply do

let auxModule = moduleFromString (pack "Aux") (pack $ "module Aux where\n" ++ "x = 3")

or

let mainModule = moduleFromString (pack "Main") (pack $ "import Aux\n" ++ "main = plainText (show Aux.x)")

Note that the first argument must match the name given in the module X where declaration in your elm file. Both arguments must be Text, not String. You can use moduleFromFile similarly.

Once you have some modules, you can compile them into JavaScript or HTML:

Right js <- buildModulesWithOptions defaultOptions mainModule [auxModule]

The first argument is always the module containing the main definition for Elm. The list is the list of all files which are dependencies of the main module. Files are written to a temp directory, then compiled using the --make option.

A current limitation is that only single-directory structures are supported.