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2012-06-30 https://fsharpforfunandprofit.com/posts/roman-numerals
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2012-06-07 https://fsharpforfunandprofit.com/posts/the-option-type
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2012-05-06 https://fsharpforfunandprofit.com/posts/partial-application
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SortW.cabal

name:                SortW
version:             0.0.1
build-type:          Simple
cabal-version:       >=1.10

executable SortW
  main-is:             SortW.hs
  build-depends:       base, HTTP, parsec
  ghc-options:         -Wall -fno-warn-unused-do-bind
  default-language:    Haskell2010

SortW.hs

{-# LANGUAGE FlexibleContexts      #-}
{-# LANGUAGE MultiParamTypeClasses #-}

module Main (main) where

import           Data.Function         (on)
import           Data.Functor.Identity (Identity)
import           Data.List             (sortBy)
import           Network.HTTP          (getRequest, getResponseBody, simpleHTTP)
import           Text.Parsec           (ParsecT, Stream, char, digit, letter,
                                        many, many1, noneOf, parse, spaces,
                                        string, try, (<|>))

data Xml =
    Elem String [Attribute] [Xml]
  | Decl String
  | Body String

newtype Attribute =
  Attribute (String, String)

root :: ParsecT String u Identity Xml
root = Decl <$> (string "<?xml" *> many (noneOf "?>") <* string "?>")

document :: ParsecT String () Identity [Xml]
document = do
  spaces
  x <- try root <|> tag
  spaces
  y <- many tag
  spaces
  return (x : y)

tag :: ParsecT String u Identity Xml
tag = do
  char '<'
  spaces
  name <- many (letter <|> digit)
  spaces
  attr <- many attribute
  spaces
  try (string "/>" <|> string ">")
  body <- many (spaces *> try tag <|> text)
  endTag name
  spaces
  return $ Elem name attr body

endTag :: Stream s m Char => String -> ParsecT s u m String
endTag str = string "</" *> string str <* char '>'

text :: ParsecT String u Identity Xml
text = Body <$> many1 (noneOf "><")

attribute :: ParsecT String u Identity Attribute
attribute = do
  name <- many (noneOf "= />")
  spaces
  char '='
  spaces
  char '"'
  value <- many (noneOf ['"'])
  char '"'
  spaces
  return $ Attribute (name, value)

searchTag :: String -> [Xml] -> [Xml]
searchTag _ [] = []
searchTag name (Decl _:xs) = searchTag name xs
searchTag name (Body _:xs) = searchTag name xs
searchTag name (Elem s attr x:xs)
  | s == name = Elem s attr x:searchTag name xs
  | otherwise = searchTag name (x ++ xs)

extractBody :: Xml -> String
extractBody (Elem _ _ (Body bd:_)) = bd
extractBody _                      = ""

xmlParse :: String -> [Xml]
xmlParse s =
  case parse document "" s of
    Right r -> r
    Left  _ -> []

getUrl :: String -> IO String
getUrl url = simpleHTTP (getRequest url) >>= getResponseBody

main :: IO ()
main = do
  sitemapString <- getUrl "http://fsharpforfunandprofit.com/sitemap.xml"
  let parsedXml = xmlParse sitemapString
      find name = map extractBody $ searchTag name parsedXml
      formatted = unlines $ map
        (\x -> fst x ++ " " ++ snd x)
        (sortBy (flip compare `on` fst) $ zip (find "lastmod") (find "loc"))
  putStr formatted

stack.yaml

resolver: lts-6.27

stack build && stack exec -- SortW > output.txt