Source reorganization and cleanup.

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

diff --git a/src/Main.hs b/src/Main.hs
index 373d423c9f322ba885db966fecff5b7e190c4dd4..5ce40269bd950a382201501f2101ed7ba7505ccf 100644 (file)
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -1,24 +1,74 @@
-{-# LANGUAGE ScopedTypeVariables, RecordWildCards #-}
+{-# LANGUAGE DoAndIfThenElse #-}
 module Main
 where
 
+import Data.Maybe (fromJust)
+import Prelude hiding (readFile)
+import System.Directory (doesFileExist)
 import System.IO (
   Handle,
   IOMode (WriteMode),
+  hPutStrLn,
   openBinaryFile,
-  stdout
-  )
-import Text.XML.HXT.Core
+  stderr,
+  stdout)
+import System.IO.UTF8 (readFile)
+import Text.XML.HXT.Core (
+  IOStateArrow,
+  XmlTree)
 
-import CommandLine (Args(..), apply_args)
-import LWN.Page
+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
 
-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
@@ -31,24 +81,21 @@ get_output_handle path =
     openBinaryFile path WriteMode
 
 
--- | Convert the given article to either a URL or a filesystem
---   path. If the given article exists on the filesystem, we assume
---   it's a file. Otherwise, we check to see if it's a URL. Failing
---   that, we try to construct a URL from what we're given and do our
---   best.
-real_article_path :: String -> IO String
-real_article_path = return . id
-
 main :: IO ()
 main = do
-  Args{..} <- apply_args
-  output_handle <- get_output_handle output
-  input_path <- real_article_path article
-  let html = my_read input_path
-  result <- parse html
+  cfg <- get_cfg
+  output_handle <- get_output_handle (output cfg)
+  maybe_html <- get_xml_from_article cfg
 
-  case result of
-    Just stuff  -> epublish stuff output_handle
-    Nothing     -> return ()
+  case maybe_html of
+    Just html -> do
+      result <- parse html
+      case result of
+        Just stuff  -> epublish stuff output_handle
+        Nothing     -> do
+         _ <- show_help
+         return ()
 
-  putStrLn "Done."
+    Nothing -> do
+      _ <- show_help
+      return ()