From e3853a9cb2a9a2cffa174d1334e2ca8ba610f151 Mon Sep 17 00:00:00 2001
From: Jose Antonio Ortega Ruiz <jao@gnu.org>
Date: Tue, 21 Dec 2010 02:36:35 +0100
Subject: Haskell sources moved to src/ to unclutter toplevel

---
 src/Plugins/Mail.hs | 70 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 70 insertions(+)
 create mode 100644 src/Plugins/Mail.hs

(limited to 'src/Plugins/Mail.hs')

diff --git a/src/Plugins/Mail.hs b/src/Plugins/Mail.hs
new file mode 100644
index 0000000..38cdaae
--- /dev/null
+++ b/src/Plugins/Mail.hs
@@ -0,0 +1,70 @@
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.Mail
+-- Copyright   :  (c) Spencer Janssen
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Spencer Janssen <sjanssen@cse.unl.edu>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A plugin for checking mail.
+--
+-----------------------------------------------------------------------------
+
+module Plugins.Mail where
+
+import Prelude hiding (catch)
+import Plugins
+import Plugins.Utils (expandHome, changeLoop)
+
+import Control.Monad
+import Control.Concurrent.STM
+
+import System.Directory
+import System.FilePath
+import System.INotify
+
+import Data.List (isPrefixOf)
+import Data.Set (Set)
+import qualified Data.Set as S
+
+-- | A list of mail box names and paths to maildirs.
+data Mail = Mail [(String, FilePath)]
+    deriving (Read, Show)
+
+instance Exec Mail where
+    start (Mail ms) cb = do
+        vs <- mapM (const $ newTVarIO S.empty) ms
+
+        let ts = map fst ms
+            rs = map ((</> "new") . snd) ms
+            ev = [Move, MoveIn, MoveOut, Create, Delete]
+
+        ds <- mapM expandHome rs
+        i <- initINotify
+        zipWithM_ (\d v -> addWatch i ev d (handle v)) ds vs
+
+        forM_ (zip ds vs) $ \(d, v) -> do
+            s <- fmap (S.fromList . filter (not . isPrefixOf "."))
+                    $ getDirectoryContents d
+            atomically $ modifyTVar v (S.union s)
+
+        changeLoop (mapM (fmap S.size . readTVar) vs) $ \ns ->
+            cb . unwords $ [m ++ ":" ++  show n
+                                    | (m, n) <- zip ts ns
+                                    , n /= 0 ]
+
+modifyTVar :: TVar a -> (a -> a) -> STM ()
+modifyTVar v f = readTVar v >>= writeTVar v . f
+
+handle :: TVar (Set String) -> Event -> IO ()
+handle v e = atomically $ modifyTVar v $ case e of
+    Created  {} -> create
+    MovedIn  {} -> create
+    Deleted  {} -> delete
+    MovedOut {} -> delete
+    _           -> id
+ where
+    delete = S.delete (filePath e)
+    create = S.insert (filePath e)
-- 
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