f8ea9ba8fe
This is largely Aaron Levin's work. But it was done in a merge commit,
so couldn't be cherry-picked in a sensible way. Thanks Aaron!
105 lines
2.7 KiB
Haskell
105 lines
2.7 KiB
Haskell
{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE DeriveGeneric #-}
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{-# LANGUAGE OverloadedStrings #-}
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{-# LANGUAGE TypeFamilies #-}
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{-# LANGUAGE TypeOperators #-}
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module T9 where
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import Control.Applicative
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import Control.Monad.IO.Class
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import Data.Aeson
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import Data.Text (Text)
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import GHC.Generics
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import Network.Wai
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import Servant
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import Servant.JS
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import System.Random
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import qualified Data.Text as T
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import qualified Data.Text.IO as TIO
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import qualified Language.Javascript.JQuery as JQ
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data Point = Point
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{ x :: Double
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, y :: Double
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} deriving Generic
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instance ToJSON Point
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randomPoint :: MonadIO m => m Point
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randomPoint = liftIO . getStdRandom $ \g ->
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let (rx, g') = randomR (-1, 1) g
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(ry, g'') = randomR (-1, 1) g'
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in (Point rx ry, g'')
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data Search a = Search
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{ query :: Text
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, results :: [a]
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} deriving Generic
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mkSearch :: Text -> [a] -> Search a
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mkSearch = Search
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instance ToJSON a => ToJSON (Search a)
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data Book = Book
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{ author :: Text
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, title :: Text
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, year :: Int
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} deriving Generic
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instance ToJSON Book
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book :: Text -> Text -> Int -> Book
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book = Book
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books :: [Book]
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books =
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[ book "Paul Hudak" "The Haskell School of Expression: Learning Functional Programming through Multimedia" 2000
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, book "Bryan O'Sullivan, Don Stewart, and John Goerzen" "Real World Haskell" 2008
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, book "Miran Lipovača" "Learn You a Haskell for Great Good!" 2011
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, book "Graham Hutton" "Programming in Haskell" 2007
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, book "Simon Marlow" "Parallel and Concurrent Programming in Haskell" 2013
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, book "Richard Bird" "Introduction to Functional Programming using Haskell" 1998
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]
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searchBook :: Monad m => Maybe Text -> m (Search Book)
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searchBook Nothing = return (mkSearch "" books)
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searchBook (Just q) = return (mkSearch q books')
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where books' = filter (\b -> q' `T.isInfixOf` T.toLower (author b)
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|| q' `T.isInfixOf` T.toLower (title b)
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)
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books
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q' = T.toLower q
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type API = "point" :> Get '[JSON] Point
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:<|> "books" :> QueryParam "q" Text :> Get '[JSON] (Search Book)
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type API' = API :<|> Raw
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api :: Proxy API
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api = Proxy
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api' :: Proxy API'
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api' = Proxy
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server :: Server API
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server = randomPoint
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:<|> searchBook
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server' :: Server API'
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server' = server
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:<|> serveDirectory "tutorial/t9"
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apiJS :: Text
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apiJS = jsForAPI api jquery
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writeJSFiles :: IO ()
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writeJSFiles = do
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TIO.writeFile "tutorial/t9/api.js" apiJS
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jq <- TIO.readFile =<< JQ.file
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TIO.writeFile "tutorial/t9/jq.js" jq
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app :: Application
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app = serve api' EmptyConfig server'
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