-{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE DoAndIfThenElse #-}
module Main
where
import Data.Maybe (fromJust)
-import Text.XML.HXT.Core -- (SysConfigList, IOStateArrow, XmlTree, readDocument)
+import Prelude hiding (readFile)
+import System.Directory (doesFileExist)
+import System.IO (
+ Handle,
+ IOMode (WriteMode),
+ hPutStrLn,
+ openBinaryFile,
+ stderr,
+ stdout)
+import System.IO.UTF8 (readFile)
+import Text.XML.HXT.Core (
+ IOStateArrow,
+ XmlTree)
-import Epublishable
-import LWN.ArticlePage
-import LWN.FullPage
+import CommandLine (show_help)
+import Configuration (Cfg(..), get_cfg, use_account)
+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
+
+
+-- | If we're given an empty path, return a handle to
+-- 'stdout'. Otherwise, open the given file and return a read/write
+-- handle to that.
+get_output_handle :: FilePath -> IO Handle
+get_output_handle path =
+ if (null path) then
+ return stdout
+ else
+ openBinaryFile path WriteMode
-my_read :: String -> IOStateArrow s b XmlTree
-my_read =
- readDocument [ withValidate no,
- withParseHTML yes,
- withInputEncoding utf8,
- withWarnings no ]
main :: IO ()
main = do
- let article_html = my_read "test/fixtures/501317-article.html"
- ioap <- parse article_html
- let article_page :: ArticlePage = fromJust $ ioap
- epublish article_page "single_article.epub"
-
- let page_html = my_read "test/fixtures/500848-page.html"
- ioap_f <- parse page_html
- let full_page :: FullPage = fromJust $ ioap_f
- epublish full_page "full_page.epub"
-
- let bigpage_html = my_read "test/fixtures/50844-bigpage.html"
- ioap_bp <- parse bigpage_html
- let bigpage :: FullPage = fromJust $ ioap_bp
- epublish bigpage "bigpage.epub"
-
- putStrLn "Done."
+ 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 ()
+
+ Nothing -> do
+ _ <- show_help
+ return ()