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 88ba39c5ff493cd9b3b0acafc9992738d080138f..1f6d7c5f436a583d5143b05c1cf55aaf4126995e 100644 (file)
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -2,14 +2,21 @@
 module Main
 where
 
+import Control.Concurrent.ParallelIO (stopGlobalPool)
+import System.Directory (doesFileExist)
 import System.IO (
   Handle,
   IOMode (WriteMode),
+  hPutStrLn,
   openBinaryFile,
-  stdout)
+  stderr,
+  stdout
+  )
 
 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)
 
 
@@ -24,14 +31,28 @@ get_output_handle path =
     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
+  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