Imported code from yesod

LICENSE

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+The following license covers this documentation, and the source code, except
+where otherwise indicated.
+
+Copyright 2010, Michael Snoyman. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice,
+  this list of conditions and the following disclaimer in the documentation
+  and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS "AS IS" AND ANY EXPRESS OR
+IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
+EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
+OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

Yesod/Helpers/AtomFeed.hs

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+{-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE CPP #-}
+---------------------------------------------------------
+--
+-- Module        : Yesod.Helpers.AtomFeed
+-- Copyright     : Michael Snoyman
+-- License       : BSD3
+--
+-- Maintainer    : Michael Snoyman <michael@snoyman.com>
+-- Stability     : Stable
+-- Portability   : portable
+--
+-- Generating atom news feeds.
+--
+---------------------------------------------------------
+
+-- | Generation of Atom newsfeeds. See
+-- <http://en.wikipedia.org/wiki/Atom_(standard)>.
+module Yesod.Helpers.AtomFeed
+    ( AtomFeed (..)
+    , AtomFeedEntry (..)
+    , atomFeed
+    , atomLink
+    , RepAtom (..)
+    ) where
+
+import Yesod.Content
+import Yesod.Handler
+import Yesod.Widget
+import Text.Hamlet
+import Data.Time.Clock (UTCTime)
+
+newtype RepAtom = RepAtom Content
+instance HasReps RepAtom where
+    chooseRep (RepAtom c) _ = return (typeAtom, c)
+
+atomFeed :: AtomFeed (Route master) -> GHandler sub master RepAtom
+atomFeed = fmap RepAtom . hamletToContent . template
+
+data AtomFeed url = AtomFeed
+    { atomTitle :: String
+    , atomLinkSelf :: url
+    , atomLinkHome :: url
+    , atomUpdated :: UTCTime
+    , atomEntries :: [AtomFeedEntry url]
+    }
+
+data AtomFeedEntry url = AtomFeedEntry
+    { atomEntryLink :: url
+    , atomEntryUpdated :: UTCTime
+    , atomEntryTitle :: String
+    , atomEntryContent :: Html
+    }
+
+template :: AtomFeed 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 $atomTitle.arg$
+    %link!rel=self!href=@atomLinkSelf.arg@
+    %link!href=@atomLinkHome.arg@
+    %updated $formatW3.atomUpdated.arg$
+    %id @atomLinkHome.arg@
+    $forall atomEntries.arg entry
+        ^entryTemplate.entry^
+|]
+
+entryTemplate :: AtomFeedEntry url -> Hamlet url
+entryTemplate arg =
+#if __GLASGOW_HASKELL__ >= 700
+                [xhamlet|
+#else
+                [$xhamlet|
+#endif
+%entry
+    %id @atomEntryLink.arg@
+    %link!href=@atomEntryLink.arg@
+    %updated $formatW3.atomEntryUpdated.arg$
+    %title $atomEntryTitle.arg$
+    %content!type=html $cdata.atomEntryContent.arg$
+|]
+
+-- | Generates a link tag in the head of a widget.
+atomLink :: Route m
+         -> String -- ^ title
+         -> GWidget s m ()
+atomLink u title = addHamletHead
+#if __GLASGOW_HASKELL__ >= 700
+                [hamlet|
+#else
+                [$hamlet|
+#endif
+%link!href=@u@!type="application/atom+xml"!rel="alternate"!title=$title$
+|]

yesod-newsfeed.cabal

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+name:            yesod-newsfeed
+version:         0.7.0
+license:         BSD3
+license-file:    LICENSE
+author:          Michael Snoyman <michael@snoyman.com>
+maintainer:      Michael Snoyman <michael@snoyman.com>
+synopsis:        Helper functions and data types for producing Atom feeds.
+category:        Web, Yesod
+stability:       Stable
+cabal-version:   >= 1.6
+build-type:      Simple
+homepage:        http://docs.yesodweb.com/
+
+library
+    build-depends:   base                      >= 4        && < 5
+                   , yesod-core                >= 0.7      && < 0.8
+                   , time                      >= 1.1.4    && < 1.3
+                   , hamlet                    >= 0.7      && < 0.8
+    exposed-modules: Yesod.Helpers.AtomFeed
+    ghc-options:     -Wall
+
+source-repository head
+  type:     git
+  location: git://github.com/snoyberg/yesod-newsfeed.git