103 lines
2.6 KiB
Haskell
103 lines
2.6 KiB
Haskell
{-# LANGUAGE QuasiQuotes #-}
|
|
{-# LANGUAGE CPP #-}
|
|
-------------------------------------------------------------------------------
|
|
--
|
|
-- Module : Yesod.Helpers.RssFeed
|
|
-- Copyright : Patrick Brisbin
|
|
-- License : as-is
|
|
--
|
|
-- Maintainer : Patrick Brisbin <me@pbrisbin.com>
|
|
-- Stability : Stable
|
|
-- Portability : Portable
|
|
--
|
|
-------------------------------------------------------------------------------
|
|
module Yesod.Helpers.RssFeed
|
|
( RssFeed (..)
|
|
, RssFeedEntry (..)
|
|
, rssFeed
|
|
, rssLink
|
|
, RepRss (..)
|
|
) where
|
|
|
|
import Yesod.Handler
|
|
import Yesod.Content
|
|
import Yesod.Widget
|
|
import Text.Hamlet
|
|
import Data.Time.Clock (UTCTime)
|
|
|
|
newtype RepRss = RepRss Content
|
|
instance HasReps RepRss where
|
|
chooseRep (RepRss c) _ = return (typeRss, c)
|
|
|
|
-- | Generate the feed
|
|
rssFeed :: RssFeed (Route master) -> GHandler sub master RepRss
|
|
rssFeed = fmap RepRss . hamletToContent . template
|
|
|
|
-- | Data type for the overall feed
|
|
data RssFeed url = RssFeed
|
|
{ rssTitle :: String
|
|
, rssLinkSelf :: url
|
|
, rssLinkHome :: url
|
|
, rssDescription :: String
|
|
, rssLanguage :: String
|
|
, rssUpdated :: UTCTime
|
|
, rssEntries :: [RssFeedEntry url]
|
|
}
|
|
|
|
-- | Data type for each feed entry
|
|
data RssFeedEntry url = RssFeedEntry
|
|
{ rssEntryLink :: url
|
|
, rssEntryUpdated :: UTCTime
|
|
, rssEntryTitle :: String
|
|
, rssEntryContent :: Html
|
|
}
|
|
|
|
template :: RssFeed url -> Hamlet url
|
|
template arg =
|
|
#if __GLASGOW_HASKELL__ >= 700
|
|
[xhamlet|
|
|
#else
|
|
[$xhamlet|
|
|
#endif
|
|
%rss!version="2.0"!xmlns:atom="http://www.w3.org/2005/Atom"
|
|
|
|
%channel
|
|
%atom:link!href=@rssLinkSelf.arg@!rel="self"!type=$typeRss$
|
|
%title $rssTitle.arg$
|
|
%link @rssLinkHome.arg@
|
|
%description $rssDescription.arg$
|
|
%lastBuildDate $formatRFC822.rssUpdated.arg$
|
|
%language $rssLanguage.arg$
|
|
|
|
$forall rssEntries.arg entry
|
|
^entryTemplate.entry^
|
|
|]
|
|
|
|
entryTemplate :: RssFeedEntry url -> Hamlet url
|
|
entryTemplate arg =
|
|
#if __GLASGOW_HASKELL__ >= 700
|
|
[xhamlet|
|
|
#else
|
|
[$xhamlet|
|
|
#endif
|
|
%item
|
|
%title $rssEntryTitle.arg$
|
|
%link @rssEntryLink.arg@
|
|
%guid @rssEntryLink.arg@
|
|
%pubDate $formatRFC822.rssEntryUpdated.arg$
|
|
%description $rssEntryContent.arg$
|
|
|]
|
|
|
|
-- | Generates a link tag in the head of a widget.
|
|
rssLink :: Route m
|
|
-> String -- ^ title
|
|
-> GWidget s m ()
|
|
rssLink u title = addHamletHead
|
|
#if __GLASGOW_HASKELL__ >= 700
|
|
[hamlet|
|
|
#else
|
|
[$hamlet|
|
|
#endif
|
|
%link!href=@u@!type=$typeRss$!rel="alternate"!title=$title$
|
|
|]
|