module Yesod.Helpers.AtomFeed
( atomFeed
, atomLink
, RepAtom (..)
, module Yesod.Helpers.FeedTypes
) where
import Yesod.Content
import Yesod.Handler
import Yesod.Widget
import Yesod.Helpers.FeedTypes
import Text.Hamlet (Hamlet, xhamlet, hamlet, cdata)
import qualified Data.ByteString.Char8 as S8
import Control.Monad (liftM)
newtype RepAtom = RepAtom Content
instance HasReps RepAtom where
chooseRep (RepAtom c) _ = return (typeAtom, c)
atomFeed :: Monad mo => Feed (Route master) -> GGHandler sub master mo RepAtom
atomFeed = liftM RepAtom . hamletToContent . template
template :: Feed url -> Hamlet url
template arg =
#if __GLASGOW_HASKELL__ >= 700
[xhamlet|
#else
[$xhamlet|
#endif
\<?xml version="1.0" encoding="utf-8"?>
<feed xmlns="http://www.w3.org/2005/Atom"
<title>#{feedTitle arg}
<link rel=self href=@{feedLinkSelf arg}
<link href=@{feedLinkHome arg}
<updated>#{formatW3 $ feedUpdated arg}
<id>@{feedLinkHome arg}
$forall entry <- feedEntries arg
^{entryTemplate entry}
|]
entryTemplate :: FeedEntry url -> Hamlet url
entryTemplate arg =
#if __GLASGOW_HASKELL__ >= 700
[xhamlet|
#else
[$xhamlet|
#endif
<entry
<id>@{feedEntryLink arg}
<link href=@{feedEntryLink arg}
<updated>#{formatW3 $ feedEntryUpdated arg}
<title>#{feedEntryTitle arg}
<content type=html>#{cdata $ feedEntryContent arg}
|]
atomLink :: Route m
-> String
-> GWidget s m ()
atomLink u title = addHamletHead
#if __GLASGOW_HASKELL__ >= 700
[hamlet|
#else
[$hamlet|
#endif
<link href=@{u} type=#{S8.unpack typeAtom} rel="alternate" title=#{title}
|]