Code import

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.

Setup.lhs

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+#!/usr/bin/env runhaskell
+
+> module Main where
+> import Distribution.Simple
+
+> main :: IO ()
+> main = defaultMain

Yesod/Json.hs

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+{-# LANGUAGE TypeSynonymInstances #-}
+{-# OPTIONS_GHC -fno-warn-orphans #-}
+module Yesod.Json
+    ( defaultLayoutJson
+    , jsonToRepJson
+    ) where
+
+import Yesod.Handler (GHandler)
+import Yesod.Content
+    ( ToContent (toContent), RepHtmlJson (RepHtmlJson), RepHtml (RepHtml)
+    , RepJson (RepJson), Content (ContentBuilder)
+    )
+import Yesod.Core (defaultLayout, Yesod)
+import Yesod.Widget (GWidget)
+import qualified Data.JSON.Types as J
+import qualified Text.JSON.Enumerator as J
+
+instance ToContent J.Value where
+    toContent = flip ContentBuilder Nothing . J.renderValue
+
+-- | Provide both an HTML and JSON representation for a piece of data, using
+-- the default layout for the HTML output ('defaultLayout').
+defaultLayoutJson :: Yesod master
+                  => GWidget sub master ()
+                  -> J.Value
+                  -> GHandler sub master RepHtmlJson
+defaultLayoutJson w json = do
+    RepHtml html' <- defaultLayout w
+    return $ RepHtmlJson html' $ toContent json
+
+-- | Wraps the 'Content' generated by 'jsonToContent' in a 'RepJson'.
+jsonToRepJson :: J.Value -> GHandler sub master RepJson
+jsonToRepJson = return . RepJson . toContent

yesod-json.cabal

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+name:            yesod-json
+version:         0.7.0
+license:         BSD3
+license-file:    LICENSE
+author:          Michael Snoyman <michael@snoyman.com>
+maintainer:      Michael Snoyman <michael@snoyman.com>
+synopsis:        Generate content for Yesod using the json-types package.
+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
+                   , json-enumerator           >= 0.0      && < 0.1
+                   , json-types                >= 0.1      && < 0.2
+    exposed-modules: Yesod.Json
+    ghc-options:     -Wall
+
+source-repository head
+  type:     git
+  location: git://github.com/snoyberg/yesod-json.git