Documentation

Use a unix filter as compiler. For example, we could use the rev program as a compiler.

rev :: Compiler (Item String)
rev = getResourceString >>= withItemBody (unixFilter "rev" [])

A more realistic example: one can use this to call, for example, the sass compiler on CSS files. More information about sass can be found here:

http://sass-lang.com/

The code is fairly straightforward, given that we use .scss for sass:

match "style.scss" $ do
    route   $ setExtension "css"
    compile $ getResourceString >>=
        withItemBody (unixFilter "sass" ["-s", "--scss"]) >>=
        return . fmap compressCss

Variant of unixFilter that should be used for binary files

match "music.wav" $ do
    route   $ setExtension "ogg"
    compile $ getResourceLBS >>= withItemBody (unixFilterLBS "oggenc" ["-"])