To install:

$ cabal install

To run tests (from within this directory):

$ fay-tests

To generate documentation (from within this directory):

$ fay-docs

Try it out:

$ fay -autorun examples/console.hs
$ node examples/console.js
Hello, World!

Cabal-dev also works:

$ cabal-dev install
$ cabal-dev/bin/fay-tests
$ cabal-dev/bin/fay-docs

$ cabal-dev/bin/fay -autorun examples/console.hs
$ node examples/console.js
Hello, World!