1 files changed, 127 insertions, 0 deletions
diff --git a/src/Main.hs~ b/src/Main.hs~
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+{-# LANGUAGE OverloadedStrings #-}
+
+import Data.UUID.V4
+import System.Directory
+import Control.Monad.Extra
+import Data.UUID
+import Data.Char
+import Data.Generics
+import Data.Maybe
+import Data.Text (Text)
+import qualified Data.Text as T
+import Text.Feed.Import
+import Text.Feed.Query
+import Text.Feed.Types
+import Text.RSS.Syntax hiding (RSSItem)
+import Data.XML.Types
+import Data.Time
+import System.Posix.Process
+import System.Posix.Files
+import Network.HostName
+import System.Random
+import System.FilePath
+
+data FeedMetadata = FeedMetadata
+  { title :: Text,
+    author :: Maybe Text,
+    home :: Maybe Text
+  }
+  deriving (Show)
+
+data Message = Message
+  { from :: Text,
+    subject :: Text,
+    date :: Text,
+    messageId :: Text,
+    body :: Text
+--    newsGroup :: Text
+  }
+  deriving (Show)
+
+formatMessage :: Message -> Text
+formatMessage (Message from subject date messageId body) =
+  "MIME-Version: 1.0\n" <> "Date: " <> date <> "\nSubject: " <> subject <>
+  "\nFrom: " <> from <> "\nMessage-ID: " <> messageId <>
+  "\nContent-Type: text/html" <> "\n\n" <> body
+
+getItemAuthor' :: Item -> Maybe Text
+getItemAuthor' item = case getItemAuthor item of
+  Just "" -> Nothing
+  Just author -> Just author
+  Nothing -> Nothing
+
+getItemContent' :: Item -> Maybe Text
+getItemContent' (RSSItem item) =
+  (fmap (T.concat . elementText) . listToMaybe .
+   filter (\e -> namePrefix (elementName e) == Just "content"))
+  $ rssItemOther item
+getItemContent' _ = Nothing
+
+toMessage :: FeedMetadata -> Item -> IO Message
+toMessage (FeedMetadata title author home) item = do
+  messageId <- genMessageId (fromMaybe "" home) (snd <$> getItemId item)
+  return $ Message
+    (fromMaybe title $ orElse (getItemAuthor' item) author)
+    (fromMaybe "Untitled" $ getItemTitle item)
+    (fromMaybe "" $ getItemDate item) -- default should be current date
+    messageId
+    (formatBody (getItemLink item) $
+     (getItemContent item) `orElse` (getItemContent' item) `orElse`
+     (getItemDescription item))
+--    title
+
+formatBody :: Maybe Text -> Maybe Text -> Text
+formatBody link desc =
+  let linkText = case link of
+        Nothing -> ""
+        Just link' -> "Link: " <> link' <> "\n\n" in
+    linkText <> (fromMaybe "" desc)
+
+toFeedMetadata :: Feed -> FeedMetadata
+toFeedMetadata feed =
+  FeedMetadata (getFeedTitle feed) (getFeedAuthor feed) (getFeedHome feed)
+
+genFilename :: FilePath -> IO String
+genFilename root = do
+  epoch <- formatTime defaultTimeLocale "%s" <$> getCurrentTime
+  pid <- getProcessID
+  host <- getHostName
+  rand <- randomRIO (10000, 99999) :: IO Int
+  return $ root </> "new" </> epoch <> "." <> show pid <> "." <>
+    host <> "." <> show rand
+
+genUniqFilename :: FilePath -> IO String
+genUniqFilename root = do
+  filename <- genFilename root
+  exists <- fileExist filename
+  if exists then genUniqFilename root else return filename
+
+hyphenateNonAlNum :: Char -> Char
+hyphenateNonAlNum c
+  | isAlphaNum c = c
+  | otherwise = '-'
+
+genMessageId :: Text -> Maybe Text -> IO Text
+genMessageId feedLink guid = do
+  id <- case guid of
+          Just guid' -> return $ T.map hyphenateNonAlNum guid'
+          Nothing -> toText <$> nextRandom
+  return $
+    "<" <> id <> "@" <> (T.map hyphenateNonAlNum feedLink) <> ".gnu" <> ">"
+
+writeMessage :: FilePath -> Message -> IO ()
+writeMessage root msg =
+  genUniqFilename root >>=
+  \filename -> writeFile filename $ T.unpack (formatMessage msg)
+
+main :: IO ()
+main = do
+  feed <- parseFeedFromFile "./stallman.xml"
+  let root = "./maildir"
+  mapM_ (createDirectoryIfMissing True)
+    [root </> "new", root </> "cur", root </> "tmp"]
+  whenJust feed $
+    \feed' ->
+      mapM_ (\msg -> 
+               writeMessage root =<< toMessage (toFeedMetadata feed') msg)
+      (getFeedItems feed')