63 lines
1.3 KiB
Haskell
63 lines
1.3 KiB
Haskell
{-# LANGUAGE DataKinds #-}
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{-# LANGUAGE TypeFamilies #-}
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{-# LANGUAGE DeriveGeneric #-}
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{-# LANGUAGE TypeOperators #-}
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{-# LANGUAGE FlexibleInstances #-}
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{-# LANGUAGE OverloadedStrings #-}
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module GS4 where
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import Data.Aeson
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import Data.Foldable (foldMap)
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import GHC.Generics
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import Lucid
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import Network.Wai
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import Servant
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import Servant.HTML.Lucid
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data Person = Person
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{ firstName :: String
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, lastName :: String
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, age :: Int
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} deriving Generic -- for the JSON instance
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-- JSON serialization
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instance ToJSON Person
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-- HTML serialization of a single person
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instance ToHtml Person where
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toHtml p =
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tr_ $ do
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td_ (toHtml $ firstName p)
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td_ (toHtml $ lastName p)
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td_ (toHtml . show $ age p)
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toHtmlRaw = toHtml
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-- HTML serialization of a list of persons
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instance ToHtml [Person] where
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toHtml persons = table_ $ do
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tr_ $ do
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td_ "first name"
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td_ "last name"
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td_ "age"
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foldMap toHtml persons
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toHtmlRaw = toHtml
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persons :: [Person]
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persons =
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[ Person "Isaac" "Newton" 372
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, Person "Albert" "Einstein" 136
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]
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type PersonAPI = "persons" :> Get '[JSON, HTML] [Person]
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personAPI :: Proxy PersonAPI
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personAPI = Proxy
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server :: Server PersonAPI
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server = return persons
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app :: Application
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app = serve personAPI server
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