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diff --git a/src/lib/Xmobar/Plugins/Monitors/Net.hs b/src/lib/Xmobar/Plugins/Monitors/Net.hs
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+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.Monitors.Net
+-- Copyright   :  (c) 2011, 2012, 2013, 2014, 2017 Jose Antonio Ortega Ruiz
+--                (c) 2007-2010 Andrea Rossato
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A. Ortega Ruiz <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A net device monitor for Xmobar
+--
+-----------------------------------------------------------------------------
+
+module Xmobar.Plugins.Monitors.Net (
+                        startNet
+                      , startDynNet
+                      ) where
+
+import Xmobar.Plugins.Monitors.Common
+
+import Data.Word (Word64)
+import Data.IORef (IORef, newIORef, readIORef, writeIORef)
+import Data.Time.Clock (UTCTime, getCurrentTime, diffUTCTime)
+import Control.Monad (forM, filterM)
+import System.Directory (getDirectoryContents, doesFileExist)
+import System.FilePath ((</>))
+import System.Console.GetOpt
+import System.IO.Error (catchIOError)
+
+import qualified Data.ByteString.Lazy.Char8 as B
+
+data NetOpts = NetOpts
+  { rxIconPattern :: Maybe IconPattern
+  , txIconPattern :: Maybe IconPattern
+  }
+
+defaultOpts :: NetOpts
+defaultOpts = NetOpts
+  { rxIconPattern = Nothing
+  , txIconPattern = Nothing
+  }
+
+options :: [OptDescr (NetOpts -> NetOpts)]
+options =
+  [ Option "" ["rx-icon-pattern"] (ReqArg (\x o ->
+     o { rxIconPattern = Just $ parseIconPattern x }) "") ""
+  , Option "" ["tx-icon-pattern"] (ReqArg (\x o ->
+     o { txIconPattern = Just $ parseIconPattern x }) "") ""
+  ]
+
+parseOpts :: [String] -> IO NetOpts
+parseOpts argv =
+  case getOpt Permute options argv of
+    (o, _, []) -> return $ foldr id defaultOpts o
+    (_, _, errs) -> ioError . userError $ concat errs
+
+data UnitPerSec = Bs | KBs | MBs | GBs deriving (Eq,Enum,Ord)
+data NetValue = NetValue Float UnitPerSec deriving (Eq,Show)
+
+instance Show UnitPerSec where
+    show Bs  = "B/s"
+    show KBs = "KB/s"
+    show MBs = "MB/s"
+    show GBs = "GB/s"
+
+data NetDev num
+    = NA
+    | NI String
+    | ND String num num deriving (Eq,Show,Read)
+
+type NetDevRawTotal = NetDev Word64
+type NetDevRate = NetDev Float
+
+type NetDevRef = IORef (NetDevRawTotal, UTCTime)
+
+-- The more information available, the better.
+-- Note that names don't matter. Therefore, if only the names differ,
+-- a compare evaluates to EQ while (==) evaluates to False.
+instance Ord num => Ord (NetDev num) where
+    compare NA NA              = EQ
+    compare NA _               = LT
+    compare _  NA              = GT
+    compare (NI _) (NI _)      = EQ
+    compare (NI _) ND {}       = LT
+    compare ND {} (NI _)     = GT
+    compare (ND _ x1 y1) (ND _ x2 y2) =
+        if downcmp /= EQ
+           then downcmp
+           else y1 `compare` y2
+      where downcmp = x1 `compare` x2
+
+netConfig :: IO MConfig
+netConfig = mkMConfig
+    "<dev>: <rx>KB|<tx>KB"      -- template
+    ["dev", "rx", "tx", "rxbar", "rxvbar", "rxipat", "txbar", "txvbar", "txipat"]     -- available replacements
+
+operstateDir :: String -> FilePath
+operstateDir d = "/sys/class/net" </> d </> "operstate"
+
+existingDevs :: IO [String]
+existingDevs = getDirectoryContents "/sys/class/net" >>= filterM isDev
+  where isDev d | d `elem` excludes = return False
+                | otherwise = doesFileExist (operstateDir d)
+        excludes = [".", "..", "lo"]
+
+isUp :: String -> IO Bool
+isUp d = flip catchIOError (const $ return False) $ do
+  operstate <- B.readFile (operstateDir d)
+  return $! (B.unpack . head . B.lines) operstate `elem`  ["up", "unknown"]
+
+readNetDev :: [String] -> IO NetDevRawTotal
+readNetDev (d:x:y:_) = do
+  up <- isUp d
+  return (if up then ND d (r x) (r y) else NI d)
+    where r s | s == "" = 0
+              | otherwise = read s
+
+readNetDev _ = return NA
+
+netParser :: B.ByteString -> IO [NetDevRawTotal]
+netParser = mapM (readNetDev . splitDevLine) . readDevLines
+  where readDevLines = drop 2 . B.lines
+        splitDevLine = selectCols . wordsBy (`elem` " :") . B.unpack
+        selectCols cols = map (cols!!) [0,1,9]
+        wordsBy f s = case dropWhile f s of
+          [] -> []
+          s' -> w : wordsBy f s'' where (w, s'') = break f s'
+
+findNetDev :: String -> IO NetDevRawTotal
+findNetDev dev = do
+  nds <- B.readFile "/proc/net/dev" >>= netParser
+  case filter isDev nds of
+    x:_ -> return x
+    _ -> return NA
+  where isDev (ND d _ _) = d == dev
+        isDev (NI d) = d == dev
+        isDev NA = False
+
+formatNet :: Maybe IconPattern -> Float -> Monitor (String, String, String, String)
+formatNet mipat d = do
+    s <- getConfigValue useSuffix
+    dd <- getConfigValue decDigits
+    let str True v = showDigits dd d' ++ show u
+            where (NetValue d' u) = byteNetVal v
+        str False v = showDigits dd $ v / 1024
+    b <- showLogBar 0.9 d
+    vb <- showLogVBar 0.9 d
+    ipat <- showLogIconPattern mipat 0.9 d
+    x <- showWithColors (str s) d
+    return (x, b, vb, ipat)
+
+printNet :: NetOpts -> NetDevRate -> Monitor String
+printNet opts nd =
+  case nd of
+    ND d r t -> do
+        (rx, rb, rvb, ripat) <- formatNet (rxIconPattern opts) r
+        (tx, tb, tvb, tipat) <- formatNet (txIconPattern opts) t
+        parseTemplate [d,rx,tx,rb,rvb,ripat,tb,tvb,tipat]
+    NI _ -> return ""
+    NA -> getConfigValue naString
+
+parseNet :: NetDevRef -> String -> IO NetDevRate
+parseNet nref nd = do
+  (n0, t0) <- readIORef nref
+  n1 <- findNetDev nd
+  t1 <- getCurrentTime
+  writeIORef nref (n1, t1)
+  let scx = realToFrac (diffUTCTime t1 t0)
+      scx' = if scx > 0 then scx else 1
+      rate da db = takeDigits 2 $ fromIntegral (db - da) / scx'
+      diffRate (ND d ra ta) (ND _ rb tb) = ND d (rate ra rb) (rate ta tb)
+      diffRate (NI d) _ = NI d
+      diffRate _ (NI d) = NI d
+      diffRate _ _ = NA
+  return $ diffRate n0 n1
+
+runNet :: NetDevRef -> String -> [String] -> Monitor String
+runNet nref i argv = do
+  dev <- io $ parseNet nref i
+  opts <- io $ parseOpts argv
+  printNet opts dev
+
+parseNets :: [(NetDevRef, String)] -> IO [NetDevRate]
+parseNets = mapM $ uncurry parseNet
+
+runNets :: [(NetDevRef, String)] -> [String] -> Monitor String
+runNets refs argv = do
+  dev <- io $ parseActive refs
+  opts <- io $ parseOpts argv
+  printNet opts dev
+    where parseActive refs' = fmap selectActive (parseNets refs')
+          selectActive = maximum
+
+startNet :: String -> [String] -> Int -> (String -> IO ()) -> IO ()
+startNet i a r cb = do
+  t0 <- getCurrentTime
+  nref <- newIORef (NA, t0)
+  _ <- parseNet nref i
+  runM a netConfig (runNet nref i) r cb
+
+startDynNet :: [String] -> Int -> (String -> IO ()) -> IO ()
+startDynNet a r cb = do
+  devs <- existingDevs
+  refs <- forM devs $ \d -> do
+            t <- getCurrentTime
+            nref <- newIORef (NA, t)
+            _ <- parseNet nref d
+            return (nref, d)
+  runM a netConfig (runNets refs) r cb
+
+byteNetVal :: Float -> NetValue
+byteNetVal v
+    | v < 1024**1 = NetValue v Bs
+    | v < 1024**2 = NetValue (v/1024**1) KBs
+    | v < 1024**3 = NetValue (v/1024**2) MBs
+    | otherwise   = NetValue (v/1024**3) GBs