90 lines
2.2 KiB
Haskell
90 lines
2.2 KiB
Haskell
{-# LANGUAGE FlexibleInstances #-}
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{-# LANGUAGE MultiParamTypeClasses #-}
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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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) where
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import Yesod.Rep
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import Data.Convertible.Text (cs)
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import Data.Time.Clock
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import Web.Encodings
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data AtomFeed = AtomFeed
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{ atomTitle :: String
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, atomLinkSelf :: String
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, atomLinkHome :: String
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, atomUpdated :: UTCTime
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, atomEntries :: [AtomFeedEntry]
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}
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instance HasReps AtomFeed where
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reps =
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[ (TypeAtom, cs . show)
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]
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data AtomFeedEntry = AtomFeedEntry
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{ atomEntryLink :: String
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, atomEntryUpdated :: UTCTime
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, atomEntryTitle :: String
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, atomEntryContent :: String
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}
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instance Show AtomFeed where
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show f = concat
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[ "<?xml version='1.0' encoding='utf-8' ?>\n"
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, "<feed xmlns='http://www.w3.org/2005/Atom'>"
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, "<title>"
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, encodeHtml $ atomTitle f
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, "</title>"
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, "<link rel='self' href='"
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, encodeHtml $ atomLinkSelf f
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, "'/>"
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, "<link href='"
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, encodeHtml $ atomLinkHome f
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, "'/>"
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, "<updated>"
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, formatW3 $ atomUpdated f
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, "</updated>"
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, "<id>"
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, encodeHtml $ atomLinkHome f
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, "</id>"
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, concatMap show $ atomEntries f
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, "</feed>"
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]
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instance Show AtomFeedEntry where
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show e = concat
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[ "<entry>"
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, "<id>"
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, encodeHtml $ atomEntryLink e
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, "</id>"
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, "<link href='"
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, encodeHtml $ atomEntryLink e
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, "' />"
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, "<updated>"
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, formatW3 $ atomEntryUpdated e
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, "</updated>"
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, "<title>"
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, encodeHtml $ atomEntryTitle e
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, "</title>"
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, "<content type='html'><![CDATA["
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, atomEntryContent e
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, "]]></content>"
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, "</entry>"
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]
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