Created
January 20, 2013 19:06
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Hacker news reader from the command line
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import Network.HTTP | |
import Text.HTML.TagSoup | |
import System | |
import System.Process | |
import Control.Monad | |
import IO | |
hackerNewsRSSFeedURL = "http://news.ycombinator.com/rss" | |
fileURLCache = ".hnCache" | |
getUrl :: String -> IO (String) | |
getUrl url = simpleHTTP(getRequest url) >>= getResponseBody | |
getTitles :: [Tag String] -> [String] | |
getTitles = getTextFromTagsWithName "title" | |
getLinks :: [Tag String] -> [String] | |
getLinks = getTextFromTagsWithName "link" | |
getTextFromTagsWithName :: String -> [Tag String] -> [String] | |
getTextFromTagsWithName _ [] = [] | |
getTextFromTagsWithName name (x:xs) = | |
case isTagOpenName name x of | |
True -> getText xs : getTextFromTagsWithName name xs | |
False -> getTextFromTagsWithName name xs | |
getText :: [Tag String] -> String | |
getText [] = "" | |
getText (x:xs) = fromTagText x | |
displayWithKey :: [String] -> [String] | |
displayWithKey [] = [] | |
displayWithKey (x:xs) = zipWith (\ a b -> (show a) ++ " - " ++ b) [0..] (x:xs) | |
runAction :: [String] -> IO() | |
runAction [] = do | |
-- Fetch the feed and display the indexed titles | |
rawRSS <- getUrl hackerNewsRSSFeedURL | |
tags <- return $ parseTags rawRSS | |
mapM_ (\ x -> hPutStrLn stdout x) $ displayWithKey $ getTitles tags | |
-- Store the links | |
store <- openFile fileURLCache WriteMode | |
mapM_ (\ x -> hPutStrLn store x) $ getLinks tags | |
hClose store | |
runAction [(x:xs)] = do | |
urls <- readFile fileURLCache | |
pHandle <- system $ getCommand (x:xs) urls | |
hPutStrLn stdout "done" | |
getCommand (x:xs) (y:ys) = "open " ++ lines (y:ys) !! (read (x:xs)) | |
main = do | |
args <- getArgs | |
runAction args |
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