Snap-Predicates
===============
This library provides the definition of a type-class `Predicate`
together with several concrete implementations which are used to
constrain the set of possible `Snap` handlers in a type-safe
way.
A module [Snap.Predicates.Tutorial](http://hackage.haskell.org/packages/archive/snap-predicates/latest/doc/html/Snap-Predicates-Tutorial.html)
is included, outlining the basic concepts.
Example Usage
-------------
```haskell
main :: IO ()
main = do
mapM_ putStrLn (showRoutes sitemap)
quickHttpServe (route . expandRoutes $ sitemap)
sitemap :: Routes Snap ()
sitemap = do
head_ "/status" (const $ return ())
get "/foo" listFoo $
Accept Text Plain :&: ParamDef "off" 0 :&: ParamDef "size" 100
post "/foo" createFoo $
Accept Text Plain :&: ContentType Application Protobuf
listFoo :: MediaType Text Plain :*: Int :*: Int -> Snap ()
listFoo (_mt :*: _off :*: _size) = return ()
createFoo :: MediaType Text Plain :*: Content Application Protobuf -> Snap ()
createFoo (_mt :*: _ct) = return ()
```