92ab8ee889
GHC 7 changes the syntax for quasi-quotation. A later patch release (7.0.2) should be adding back backwards-compatibility with the old syntax, but in the meanwhile this (relatively ugly) hack should fix it.
97 lines
2.3 KiB
Haskell
97 lines
2.3 KiB
Haskell
{-# LANGUAGE QuasiQuotes #-}
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{-# LANGUAGE CPP #-}
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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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-- | Generation of Atom newsfeeds. See
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-- <http://en.wikipedia.org/wiki/Atom_(standard)>.
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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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, atomLink
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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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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 (Route master) -> 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 :: Html
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}
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template :: AtomFeed url -> Hamlet url
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template arg =
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#if GHC7
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[xhamlet|
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#else
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[$xhamlet|
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#endif
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<?xml version="1.0" encoding="utf-8"?>
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%feed!xmlns="http://www.w3.org/2005/Atom"
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%title $atomTitle.arg$
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%link!rel=self!href=@atomLinkSelf.arg@
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%link!href=@atomLinkHome.arg@
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%updated $formatW3.atomUpdated.arg$
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%id @atomLinkHome.arg@
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$forall atomEntries.arg entry
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^entryTemplate.entry^
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|]
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entryTemplate :: AtomFeedEntry url -> Hamlet url
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entryTemplate arg =
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#if GHC7
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[xhamlet|
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#else
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[$xhamlet|
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#endif
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%entry
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%id @atomEntryLink.arg@
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%link!href=@atomEntryLink.arg@
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%updated $formatW3.atomEntryUpdated.arg$
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%title $atomEntryTitle.arg$
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%content!type=html $cdata.atomEntryContent.arg$
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|]
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-- | Generates a link tag in the head of a widget.
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atomLink :: Route m
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-> String -- ^ title
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-> GWidget s m ()
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atomLink u title = addHamletHead
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#if GHC7
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[hamlet|
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#else
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[$hamlet|
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#endif
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%link!href=@u@!type="application/atom+xml"!rel="alternate"!title=$title$
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|]
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