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|
{- Utilities for working with Maildir format.
-
- Copyright 2013 Raúl Benencia <rul@kalgan.cc>
-
- Licensed under the GNU GPL version 3 or higher
-
-}
module Maildir where
import Control.Monad.Loops(allM)
import Control.Monad (forM, filterM)
import Data.List(isPrefixOf)
import System.Directory (doesDirectoryExist, getDirectoryContents)
import System.FilePath ((</>))
import System.IO(IOMode(..), hGetContents, openFile)
import Network.Email.Mailbox(Flag(..), Flags)
type Maildir = FilePath
isMaildir :: FilePath -> IO Bool
isMaildir fp = allM doesDirectoryExist [ fp
, fp </> "cur"
, fp </> "new"
, fp </> "tmp"]
getMaildirEmails md = do
r <- (getReadEmails md)
n <- (getNewEmails md)
return $ r ++ n
getReadEmails md = getEmails $ md </> "cur"
getNewEmails md = getEmails $ md </> "new"
getEmails fp = do
contents <- getDirectoryContents fp
return $ map (fp </>) $ filter (`notElem` [".", ".."]) contents
{- | Returns information about specific messages. -}
getMessages :: Maildir -> [FilePath] -> IO [(FilePath, Flags, String)]
getMessages mb list = do
messages <- getAll mb
return $ filter (\(id, f, m) -> id `elem` list) messages
--
-- | Based on getRecursiveContents from Real World Haskell
--
getMaildirsRecursively :: FilePath -> IO [Maildir]
getMaildirsRecursively topdir = do
result <- search topdir
includeTopDir <- isMaildir topdir
if includeTopDir
then return (topdir:result)
else return result
where
search topdir = do
names <- getDirectoryContents topdir
let properNames = filter (`notElem` [".", ".."]) names
paths <- forM properNames $ \name -> do
let path = topdir </> name
isDirectory <- doesDirectoryExist path
if isDirectory
then do
result <- search path
return ([path] ++ result)
else return []
filterM isMaildir (concat paths)
{- The following code is an implementation of the Mailbox interface -}
listIDs :: Maildir -> IO [FilePath]
listIDs md = getNewIDs md `appendM` getReadIDs md
where mxs `appendM` mxs' = do
xs <- mxs
xs' <- mxs'
return (xs ++ xs')
getNewIDs :: Maildir -> IO [FilePath]
getNewIDs md = getIDs (md </> "new")
getReadIDs :: Maildir -> IO [FilePath]
getReadIDs md = getIDs (md </> "cur")
getIDs :: FilePath -> IO [FilePath]
getIDs fp = do
names <-getDirectoryContents fp
let properNames = filter (`notElem` [".", ".."]) names
return $ map (fp </>) properNames
listMessageFlags :: Maildir -> IO [(FilePath, Flags)]
listMessageFlags fp = do
ids <- (listIDs fp)
let flags = map getFlags ids
return (zip ids flags)
getFlags :: FilePath -> Flags
getFlags fp = map toFlag $ strip fp
where strip x
| null x = []
| ":2," `isPrefixOf` x = drop 3 x
| otherwise = let (discard, analyze) = span (/= ':') fp
in strip analyze
toFlag :: Char -> Flag
toFlag c | c == 'S' = SEEN
| c == 'A' = ANSWERED
| c == 'F' = FLAGGED
| c == 'D' = DRAFT
| c == 'P' = FORWARDED
| c == 'T' = DELETED
| otherwise = OTHERFLAG [c]
getAll :: Maildir -> IO [(FilePath, Flags, String)]
getAll fp = do
ids <- listIDs fp
msgs <- mapM (\x -> hGetContents =<< openFile x ReadMode) ids
let flags = map getFlags ids
return $ zip3 ids flags msgs
|
