where
import Control.Concurrent
-import Control.Concurrent.MVar
import Control.Exception (evaluate)
import Data.List (intercalate)
+import Data.Time (formatTime, getZonedTime)
import System.Exit
+import System.Locale (defaultTimeLocale, rfc822DateFormat)
import System.Process
-import System.IO
+import System.IO (hClose, hGetContents, hPutStr)
+
type Header = String
to :: String }
deriving (Eq)
+-- |The default headers attached to each message.
+-- The MIME junk is needed for UTF-8 to work properly.
+-- Note that your mail server should support the 8BITMIME extension.
+default_headers :: [Header]
+default_headers = ["MIME-Version: 1.0",
+ "Content-Type: text/plain; charset=UTF-8",
+ "Content-Transfer-Encoding: 8bit"]
+
-- |Showing a message will print it in roughly RFC-compliant
-- form. This form is sufficient for handing the message off to
-- sendmail.
-instance Show Message where
+instance Show Message where
show m =
concat [ if (length (headers m) == 0) then "" else (intercalate "\n" (headers m)) ++ "\n",
"Subject: " ++ (subject m) ++ "\n",
(body m) ]
+
+-- |Pad a string on the left with zeros until the entire string has
+-- length n.
+pad_left :: String -> Int -> String
+pad_left str n
+ | n < (length str) = str
+ | otherwise = (replicate num_zeros '0') ++ str
+ where num_zeros = n - (length str)
+
+
+
+-- | Constructs a 'String' in RFC822 date format for the current
+-- date/time.
+rfc822_now :: IO String
+rfc822_now = do
+ date <- getZonedTime
+ return $ formatTime defaultTimeLocale rfc822DateFormat date
+
+
+
-- |Takes a message as an argument, and passes it to the system's
-- sendmail binary.
sendmail :: Message -> IO (String, String, ExitCode)
errm <- newEmptyMVar
errs <- hGetContents errh
- forkIO $ hPutStr inh (show message) >> hClose inh
- forkIO $ evaluate (length outs) >> putMVar outm ()
- forkIO $ evaluate (length errs) >> putMVar errm ()
+ _ <- forkIO $ hPutStr inh (show message) >> hClose inh
+ _ <- forkIO $ evaluate (length outs) >> putMVar outm ()
+ _ <- forkIO $ evaluate (length errs) >> putMVar errm ()
readMVar outm
readMVar errm