* added RSS.hs: functions to create an RSS feed

* added RSS feed handler
* FromReqURI instance for BlogLang
* fixed RSS-feed link

src/RSS.hs

@@ -0,0 +1,42 @@
+{-# LANGUAGE RecordWildCards #-}
+
+module RSS (renderFeed) where
+
+import qualified Data.Text as T
+
+import Data.Maybe (fromMaybe)
+import Data.Time (getCurrentTime, UTCTime)
+import Network.URI
+import Text.RSS
+
+import Locales
+import BlogDB hiding (Title)
+
+createChannel :: BlogLang -> UTCTime -> [ChannelElem]
+createChannel l  now = [ Language $ show l
+                       , Copyright "Vincent Ambo"
+                       , WebMaster "tazjin@googlemail.com"
+                       , ChannelPubDate now
+                       ]
+
+createRSS :: BlogLang -> UTCTime -> [Item] -> RSS
+createRSS l t i = RSS (rssTitle l) (rssLink l) (rssDesc l) (createChannel l t) i
+
+createItem :: Entry -> Item
+createItem Entry{..} = [ Title $ T.unpack title 
+                       , Link $ makeLink lang entryId
+                       , Description $ T.unpack btext
+                       , PubDate edate]
+
+makeLink :: BlogLang -> EntryId -> URI
+makeLink l i = let url = "http://tazj.in/" ++ show l ++ "/" ++ show i
+               in fromMaybe nullURI $ parseURI url
+
+createItems :: [Entry] -> [Item]
+createItems = map createItem
+
+createFeed :: BlogLang -> [Entry] -> IO RSS
+createFeed l e = getCurrentTime >>= (\t -> return $ createRSS l t $ createItems e )
+
+renderFeed :: BlogLang -> [Entry] -> IO String
+renderFeed l e = createFeed l e >>= (\feed -> return $ showXML $ rssToXML feed)