Add feed functions to generate feeds with external links

Rather than requiring a Route, these functions can accept Text URLs and just use
id to render them.

yesod-newsfeed/Yesod/AtomFeed.hs

@@ -20,6 +20,7 @@
 -- | Generation of Atom newsfeeds.
 module Yesod.AtomFeed
     ( atomFeed
+    , atomFeedText
     , atomLink
     , RepAtom (..)
     , module Yesod.FeedTypes
@@ -47,6 +48,11 @@ atomFeed feed = do
     render <- getUrlRender
     return $ RepAtom $ toContent $ renderLBS def $ template feed render
 
+-- | Same as @'atomFeed'@ but for @'Feed Text'@. Useful for cases where you are
+--   generating a feed of external links.
+atomFeedText :: MonadHandler m => Feed Text -> m RepAtom
+atomFeedText feed = return $ RepAtom $ toContent $ renderLBS def $ template feed id
+
 template :: Feed url -> (url -> Text) -> Document
 template Feed {..} render =
     Document (Prologue [] Nothing []) (addNS root) []

yesod-newsfeed/Yesod/Feed.hs

@@ -17,6 +17,7 @@
 -------------------------------------------------------------------------------
 module Yesod.Feed
     ( newsFeed
+    , newsFeedText
     , module Yesod.FeedTypes
     ) where
 
@@ -29,3 +30,10 @@ newsFeed :: MonadHandler m => Feed (Route (HandlerSite m)) -> m TypedContent
 newsFeed f = selectRep $ do
     provideRep $ atomFeed f
     provideRep $ rssFeed f
+
+-- | Same as @'newsFeed'@ but for @'Feed Text'@. Useful for cases where you are
+--   generating a feed of external links.
+newsFeedText :: MonadHandler m => Feed Text -> m TypedContent
+newsFeedText f = selectRep $ do
+    provideRep $ atomFeedText f
+    provideRep $ rssFeedText f

yesod-newsfeed/Yesod/RssFeed.hs

@@ -16,6 +16,7 @@
 -------------------------------------------------------------------------------
 module Yesod.RssFeed
     ( rssFeed
+    , rssFeedText
     , rssLink
     , RepRss (..)
     , module Yesod.FeedTypes
@@ -44,6 +45,11 @@ rssFeed feed = do
     render <- getUrlRender
     return $ RepRss $ toContent $ renderLBS def $ template feed render
 
+-- | Same as @'rssFeed'@ but for @'Feed Text'@. Useful for cases where you are
+--   generating a feed of external links.
+rssFeedText :: MonadHandler m => Feed Text -> m RepRss
+rssFeedText feed = return $ RepRss $ toContent $ renderLBS def $ template feed id
+
 template :: Feed url -> (url -> Text) -> Document
 template Feed {..} render =
     Document (Prologue [] Nothing []) root []