74 lines
1.8 KiB
Haskell
74 lines
1.8 KiB
Haskell
{-# LANGUAGE QuasiQuotes #-}
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---------------------------------------------------------
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--
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-- Module : Yesod.Helpers.AtomFeed
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-- Copyright : Michael Snoyman
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-- License : BSD3
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--
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-- Maintainer : Michael Snoyman <michael@snoyman.com>
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-- Stability : Stable
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-- Portability : portable
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--
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-- Generating atom news feeds.
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--
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---------------------------------------------------------
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module Yesod.Helpers.AtomFeed
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( AtomFeed (..)
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, AtomFeedEntry (..)
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, atomFeed
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, RepAtom (..)
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) where
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import Yesod
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import Data.Time.Clock (UTCTime)
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import Web.Encodings (formatW3)
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import Text.Hamlet.Monad
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newtype RepAtom = RepAtom Content
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instance HasReps RepAtom where
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chooseRep (RepAtom c) _ = return (TypeAtom, c)
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atomFeed :: AtomFeed (Routes sub) -> GHandler sub master RepAtom
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atomFeed = fmap RepAtom . hamletToContent . template
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data AtomFeed url = AtomFeed
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{ atomTitle :: String
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, atomLinkSelf :: url
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, atomLinkHome :: url
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, atomUpdated :: UTCTime
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, atomEntries :: [AtomFeedEntry url]
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}
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data AtomFeedEntry url = AtomFeedEntry
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{ atomEntryLink :: url
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, atomEntryUpdated :: UTCTime
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, atomEntryTitle :: String
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, atomEntryContent :: HtmlContent
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}
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xmlns :: AtomFeed url -> HtmlContent
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xmlns _ = cs "http://www.w3.org/2005/Atom"
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template :: AtomFeed url -> Hamlet url IO ()
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template = [$hamlet|
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%feed!xmlns=$xmlns$
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%title $atomTitle.cs$
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%link!rel=self!href=@atomLinkSelf@
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%link!href=@atomLinkHome@
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%updated $atomUpdated.formatW3.cs$
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%id @atomLinkHome@
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$forall atomEntries entry
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^entry.entryTemplate^
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|]
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entryTemplate :: AtomFeedEntry url -> Hamlet url IO ()
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entryTemplate = [$hamlet|
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%entry
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%id @atomEntryLink@
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%link!href=@atomEntryLink@
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%updated $atomEntryUpdated.formatW3.cs$
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%title $atomEntryTitle.cs$
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%content!type=html $atomEntryContent.cdata$
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|]
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