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{-# LANGUAGE OverloadedStrings #-}
module F2Md.Export (writeMessage) where
import F2Md.Types
import Data.Text (Text)
import qualified Data.Text as T
import System.Posix.Process
import System.Posix.Files
import Data.Time
import Network.HostName
import System.Random
import System.FilePath
formatMessage :: Message -> Text
formatMessage (Message from subject date messageId body _) =
"MIME-Version: 1.0\n" <> "Date: " <> (T.pack $ show date) <> "\nSubject: " <> subject <>
"\nFrom: " <> from <> "\nMessage-ID: " <> messageId <>
"\nContent-Type: text/html" <> "\n\n" <> body
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
writeMessage :: FilePath -> Message -> IO ()
writeMessage root msg =
genUniqFilename root >>=
\filename -> writeFile filename $ T.unpack (formatMessage msg)
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