A trivial get request which yields a 'byte stream' for manipulation. Here we number the verses of a bible from Project Gutenberg...
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{-#LANGUAGE OverloadedStrings #-} | |
import Streaming | |
import Streaming.Prelude (each, next, yield) | |
import qualified Data.ByteString.Streaming.Char8 as Q | |
import qualified Data.ByteString.Char8 as B | |
import qualified Streaming.Prelude as S | |
import qualified Control.Foldl as L | |
import Data.ByteString.Streaming.HTTP -- git clone https://github.com/michaelt/streaming-http | |
-- cabal install ./streaming-http | |
infixl 5 >>>; (>>>) = flip (.) | |
infixl 1 &; (&) = flip ($) | |
main = do | |
req <- parseUrl "https://raw.githubusercontent.com/michaelt/kjv/master/kjv.txt" | |
m <- newManager tlsManagerSettings | |
withHTTP req m $ \resp -> | |
resp & -- Response (Q.ByteString IO ()) | |
responseBody -- Q.ByteString IO () | |
>>> Q.lines -- Stream (Q.ByteString IO) IO () | |
>>> Q.denull -- Stream (Q.ByteString IO) IO () | |
>>> interleaves numerals -- Stream (Q.ByteString IO) IO () | |
>>> Q.unlines -- Q.ByteString IO () | |
>>> Q.stdout -- IO () | |
where | |
numerals = maps padded (S.enumFrom 1) | |
padded (n:>r) = Q.chunk stuff >> return r | |
where | |
len = length (show n); diff = 5 - len | |
padding = if diff > 0 then B.replicate diff ' ' else "" | |
stuff = padding `mappend` B.pack (show n ++ " ") | |
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