scrape.hs

scrape.cabal

name:                scrape
version:             0.1.0.0
-- synopsis:
-- description:
homepage:            https://github.com/githubuser/scrape#readme
license:             BSD3
license-file:        LICENSE
author:              Author name here
maintainer:          example@example.com
copyright:           2018 Author name here
category:            Web
build-type:          Simple
cabal-version:       >=1.10
extra-source-files:  README.md

executable scrape
  hs-source-dirs:      src
  main-is:             Main.hs
  default-language:    Haskell2010
  build-depends:       base >= 4.7 && < 5
                     , text
                     , http-conduit
                     , html-conduit
                     , xml-conduit

scrape.hs

{-# LANGUAGE OverloadedStrings #-}

module Main where

import Control.Monad (forM_)
import Data.Text (Text)
import qualified Data.Text as T
import qualified Data.Text.IO as T
import Network.HTTP.Simple (httpSink)
import Text.HTML.DOM (sinkDoc)
import Text.XML (Name)
import Text.XML.Cursor

attributeContains :: Name -> Text -> Cursor -> Bool
attributeContains k v c = elem v values
  where
    attrs = attribute k c
    values = concat $ map T.words attrs

extract :: Cursor -> (Cursor -> [Text]) -> [Text]
extract c f =
  c $// element "a" >=>
  check (attributeContains "class" "recent-entries-title-link") &.// f

main :: IO ()
main = do
  doc <- httpSink "https://paiza.hatenablog.com/" $ const sinkDoc
  let cursor = fromDocument doc
  let contents = extract cursor content
  let hrefs = extract cursor (attribute "href")
  forM_ (zip contents hrefs) $ \(c, h) -> T.putStrLn $ T.unlines [c, h]