module Main
where
-import Data.Maybe (fromJust)
-import Prelude hiding (readFile)
+import Control.Concurrent.ParallelIO (stopGlobalPool)
import System.Directory (doesFileExist)
import System.IO (
Handle,
hPutStrLn,
openBinaryFile,
stderr,
- stdout)
-import System.IO.UTF8 (readFile)
-import Text.XML.HXT.Core (
- IOStateArrow,
- XmlTree)
+ stdout
+ )
import CommandLine (show_help)
-import Configuration (Cfg(..), get_cfg, use_account)
+import Configuration (Cfg(..), get_cfg)
import LWN.Article (real_article_path)
-import LWN.HTTP (get_page, log_in, make_cookie_jar)
-import LWN.Page (epublish, parse)
-import LWN.XHTML (parse_lwn)
-
-
-
--- | Try to parse the given article using HXT. We try a few different
--- methods; if none of them work, we return 'Nothing'.
-get_xml_from_article :: Cfg -> IO (Maybe (IOStateArrow s b XmlTree))
-get_xml_from_article cfg = do
- my_article <- real_article_path (article cfg)
- is_file <- doesFileExist my_article
- case is_file of
- True -> do
- contents <- readFile my_article
- return $ Just $ parse_lwn contents
- False -> do
- -- Download the URL and try to parse it.
- if use_account cfg then do
- -- use_account would be false if these fromJusts would fail.
- cj <- make_cookie_jar
- li_result <- log_in cj
- (fromJust $ username cfg)
- (fromJust $ password cfg)
-
- case li_result of
- Left err -> do
- let msg = "Failed to log in. " ++ err
- hPutStrLn stderr msg
- Right response_body -> do
- hPutStrLn stderr response_body
-
- html <- get_page (Just cj) my_article
-
- case html of
- Left err -> do
- let msg = "Failed to retrieve page. " ++ err
- hPutStrLn stderr msg
- return Nothing
- Right h -> return $ Just $ parse_lwn h
- else do
- html <- get_page Nothing my_article
- case html of
- Left err -> do
- let msg = "Failed to retrieve page. " ++ err
- hPutStrLn stderr msg
- return Nothing
- Right h -> return $ Just $ parse_lwn h
+import LWN.HTTP (get_login_cookie)
+import LWN.Page (epublish, page_from_url)
-- | If we're given an empty path, return a handle to
openBinaryFile path WriteMode
+argument_is_file :: Cfg -> IO Bool
+argument_is_file cfg = do
+ path <- real_article_path (article cfg)
+ doesFileExist path
+
main :: IO ()
main = do
- cfg <- get_cfg
- output_handle <- get_output_handle (output cfg)
- maybe_html <- get_xml_from_article cfg
-
- case maybe_html of
- Just html -> do
- result <- parse html
- case result of
- Just stuff -> epublish stuff output_handle
- Nothing -> do
- _ <- show_help
- return ()
-
+ cfg' <- get_cfg
+ aif <- argument_is_file cfg'
+ cfg <- case aif of
+ False -> get_login_cookie cfg'
+ True -> return cfg'
+
+ page <- page_from_url cfg (article cfg)
+ case page of
+ Just p -> do
+ output_handle <- get_output_handle (output cfg)
+ epublish p output_handle
Nothing -> do
+ hPutStrLn stderr "ERROR: could not parse an LWN page from the given URL."
_ <- show_help
return ()
+
+ -- Necessary, for some reason.
+ stopGlobalPool