Print an error before usage if we can't parse the page.

[dead/lwn-epub.git] / src / Main.hs

diff --git a/src/Main.hs b/src/Main.hs
index c6ab443a9620d20f716576eb0c188702f8ad4b5d..1f6d7c5f436a583d5143b05c1cf55aaf4126995e 100644 (file)
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -1,36 +1,58 @@
-{-# LANGUAGE ScopedTypeVariables #-}
+{-# LANGUAGE DoAndIfThenElse #-}
 module Main
 where
 
-import Data.Maybe (fromJust)
-import Text.XML.HXT.Core -- (SysConfigList, IOStateArrow, XmlTree, readDocument)
+import Control.Concurrent.ParallelIO (stopGlobalPool)
+import System.Directory (doesFileExist)
+import System.IO (
+  Handle,
+  IOMode (WriteMode),
+  hPutStrLn,
+  openBinaryFile,
+  stderr,
+  stdout
+  )
 
-import Epublishable
-import LWN.ArticlePage
-import LWN.FullPage
+import CommandLine (show_help)
+import Configuration (Cfg(..), get_cfg)
+import LWN.Article (real_article_path)
+import LWN.HTTP (get_login_cookie)
+import LWN.Page (epublish, page_from_url)
 
-my_read :: String -> IOStateArrow s b XmlTree
-my_read =
-  readDocument [ withValidate  no,
-                 withParseHTML yes,
-                 withInputEncoding utf8,
-                 withWarnings no ]
+
+-- | 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
+
+
+argument_is_file :: Cfg -> IO Bool
+argument_is_file cfg = do
+  path <- real_article_path (article cfg)
+  doesFileExist path
 
 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
+  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