Source reorganization and cleanup.

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

diff --git a/src/Main.hs b/src/Main.hs
index e91654da85a6446d32a02afed636a106dd514a7e..5ce40269bd950a382201501f2101ed7ba7505ccf 100644 (file)
--- a/src/Main.hs
+++ b/src/Main.hs
@@ -1,14 +1,101 @@
+{-# LANGUAGE DoAndIfThenElse #-}
 module Main
 where
 
-data Article = Article { headline  :: String,
-                         byline    :: String,
-                         body_html :: String }
-             deriving (Eq, Show)
+import Data.Maybe (fromJust)
+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 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
 
-parse_article :: String -> String
-parse_article _ = ""
 
 main :: IO ()
 main = do
-  putStrLn "Hello, world."
+  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 ()