Clean URLs with and without trailing slash

[niamu]

This pull request is the other half of the work related to cryogen-project/cryogen-core#119.

[lacarmen]

I had to update the server.clj code so that navigating to /blog would work with :no-trailing-slash and :dirty

(defn update-path 
  [config req-uri]
  (if (or (= req-uri "") (= req-uri "/") (= req-uri (.substring (:blog-prefix config) 1)))
    (path req-uri "index.html")
    (path (str req-uri ".html"))))

(defn wrap-subdirectories
  [handler]
  (fn [request]
    (let [{:keys [clean-urls] :as config} (read-config)
          req-uri (.substring (url-decode (:uri request)) 1)
          res-path (condp = clean-urls
                     :trailing-slash (path req-uri "index.html")
                     :no-trailing-slash (update-path config req-uri) 
                     :dirty (update-path config req-uri))]
      (or (resource-response res-path {:root "public"})
          (handler request)))))

[lacarmen]

@niamu Could you double check that we have all the cases covered? I tested everything myself but a 2nd pair of eyes is always better :)

[niamu]

Yup, you're right. I must have not had a :blog-prefix set when testing that case. I've resolved it now and confirmed the other cases are still working.

[lacarmen]

Thanks @niamu, looks like everything is working!

I'm going to merge this + the cryogen-core change but I will hold off on the docs one until I release everything together with cryogen-project/cryogen-core#117

[lacarmen]

Actually, I changed my mind. I'm going to do two releases for the two changes since the project structure one will introduce breaking changes and users might want to get the clean-urls change but not the project structure change.