streamly-0.2.0: examples/SearchQuery.hs

import Streamly
import Streamly.Prelude (once)
import Network.HTTP.Simple

-- | Runs three search engine queries in parallel and prints the search engine
-- names in the fastest first order.
--
-- Does it twice using two different ways.
--
main :: IO ()
main = do
    putStrLn "Using parallel semigroup composition"
    runStream . parallely $ google <> bing <> duckduckgo

    putStrLn "\nUsing parallel applicative zip"
    runStream . zipAsyncly $ (,,) <$> google <*> bing <*> duckduckgo

    where
        get :: IsStream t => String -> t IO ()
        get s = once (httpNoBody (parseRequest_ s) >> putStrLn (show s))

        google, bing, duckduckgo :: IsStream t => t IO ()
        google     = get "https://www.google.com/search?q=haskell"
        bing       = get "https://www.bing.com/search?q=haskell"
        duckduckgo = get "https://www.duckduckgo.com/?q=haskell"