Snap.Snaplet.GHCJS

Snaplet that serves javascript files compiled with ghcjs (https://github.com/valderman/ghcjs-compiler). This Snaplet is meant to be used for development. You can work on client side Haskell code and immedietely test the code with a simple browser reload. It certainly adds some overhead and is not meant to be used in production websites.

Usage:

Put haskell source files in the snaplet path (e.g. $ROOT/snaplets/ghcjs). For every such haskell file there will be a new javascript file available via http.

• Other files won't be served through http. The snaplet will mzero on .hs, .hi, .o and all other files.
• If any haskell file in the snaplet path is newer than the requested javascript file, it will be recompiled. The ghcjs snaplet does not track haskell import dependencies: recompilation happens whether the js file is requested or not.
• If ghcjsc exits with an error code this snaplet will serve a special javascript file that contains the error message as a comment and a javascript command that will raise the error message as a javascript exception.

Please add such a handler to your routes:

[ ... , ("" , with ghcjs ghcjsServe) ]

Documentation

data GHCJS

Internal data type for the ghcjs snaplet.

snapletArgs :: Lens' GHCJS [String]

initialize :: [String] -> SnapletInit app GHCJS

Initializes the ghcjs snaplet. Use it with e.g. nestSnaplet.

ghcjsServe :: Handler app GHCJS ()