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diff --git a/src/lib/Xmobar/Plugins/Monitors/MultiCpu.hs b/src/lib/Xmobar/Plugins/Monitors/MultiCpu.hs
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+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.Monitors.MultiCpu
+-- Copyright   :  (c) Jose A Ortega Ruiz
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A Ortega <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A multi-cpu monitor for Xmobar
+--
+-----------------------------------------------------------------------------
+
+module Xmobar.Plugins.Monitors.MultiCpu (startMultiCpu) where
+
+import Xmobar.Plugins.Monitors.Common
+import Control.Applicative ((<$>))
+import qualified Data.ByteString.Lazy.Char8 as B
+import Data.List (isPrefixOf, transpose, unfoldr)
+import Data.IORef (IORef, newIORef, readIORef, writeIORef)
+import System.Console.GetOpt
+
+data MultiCpuOpts = MultiCpuOpts
+  { loadIconPatterns :: [IconPattern]
+  , loadIconPattern :: Maybe IconPattern
+  , fallbackIconPattern :: Maybe IconPattern
+  }
+
+defaultOpts :: MultiCpuOpts
+defaultOpts = MultiCpuOpts
+  { loadIconPatterns = []
+  , loadIconPattern = Nothing
+  , fallbackIconPattern = Nothing
+  }
+
+options :: [OptDescr (MultiCpuOpts -> MultiCpuOpts)]
+options =
+  [ Option "" ["load-icon-pattern"] (ReqArg (\x o ->
+     o { loadIconPattern = Just $ parseIconPattern x }) "") ""
+  , Option "" ["load-icon-patterns"] (ReqArg (\x o ->
+     o { loadIconPatterns = parseIconPattern x : loadIconPatterns o }) "") ""
+  , Option "" ["fallback-icon-pattern"] (ReqArg (\x o ->
+     o { fallbackIconPattern = Just $ parseIconPattern x }) "") ""
+  ]
+
+parseOpts :: [String] -> IO MultiCpuOpts
+parseOpts argv =
+  case getOpt Permute options argv of
+    (o, _, []) -> return $ foldr id defaultOpts o
+    (_, _, errs) -> ioError . userError $ concat errs
+
+variables :: [String]
+variables = ["bar", "vbar","ipat","total","user","nice","system","idle"]
+vNum :: Int
+vNum = length variables
+
+multiCpuConfig :: IO MConfig
+multiCpuConfig =
+  mkMConfig "Cpu: <total>%" $
+            ["auto" ++ k | k <- variables] ++
+            [ k ++ n     | n <- "" : map show [0 :: Int ..]
+                         , k <- variables]
+
+type CpuDataRef = IORef [[Int]]
+
+cpuData :: IO [[Int]]
+cpuData = parse `fmap` B.readFile "/proc/stat"
+  where parse = map parseList . cpuLists
+        cpuLists = takeWhile isCpu . map B.words . B.lines
+        isCpu (w:_) = "cpu" `isPrefixOf` B.unpack w
+        isCpu _ = False
+        parseList = map (parseInt . B.unpack) . tail
+
+parseCpuData :: CpuDataRef -> IO [[Float]]
+parseCpuData cref =
+  do as <- readIORef cref
+     bs <- cpuData
+     writeIORef cref bs
+     let p0 = zipWith percent bs as
+     return p0
+
+percent :: [Int] -> [Int] -> [Float]
+percent b a = if tot > 0 then map (/ tot) $ take 4 dif else [0, 0, 0, 0]
+  where dif = map fromIntegral $ zipWith (-) b a
+        tot = sum dif
+
+formatMultiCpus :: MultiCpuOpts -> [[Float]] -> Monitor [String]
+formatMultiCpus _ [] = return []
+formatMultiCpus opts xs = concat <$> mapM (\(i, x) -> formatCpu opts i x) (zip [0..] xs)
+
+formatCpu :: MultiCpuOpts -> Int -> [Float] -> Monitor [String]
+formatCpu opts i xs
+  | length xs < 4 = showPercentsWithColors $ replicate vNum 0.0
+  | otherwise = let t = sum $ take 3 xs
+                in do b <- showPercentBar (100 * t) t
+                      h <- showVerticalBar (100 * t) t
+                      d <- showIconPattern tryString t
+                      ps <- showPercentsWithColors (t:xs)
+                      return (b:h:d:ps)
+  where tryString
+          | i == 0 = loadIconPattern opts
+          | i <= length (loadIconPatterns opts) = Just $ loadIconPatterns opts !! (i - 1)
+          | otherwise = fallbackIconPattern opts
+
+splitEvery :: Int -> [a] -> [[a]]
+splitEvery n = unfoldr (\x -> if null x then Nothing else Just $ splitAt n x)
+
+groupData :: [String] -> [[String]]
+groupData = transpose . tail . splitEvery vNum
+
+formatAutoCpus :: [String] -> Monitor [String]
+formatAutoCpus [] = return $ replicate vNum ""
+formatAutoCpus xs = return $ map unwords (groupData xs)
+
+runMultiCpu :: CpuDataRef -> [String] -> Monitor String
+runMultiCpu cref argv =
+  do c <- io $ parseCpuData cref
+     opts <- io $ parseOpts argv
+     l <- formatMultiCpus opts c
+     a <- formatAutoCpus l
+     parseTemplate $ a ++ l
+
+startMultiCpu :: [String] -> Int -> (String -> IO ()) -> IO ()
+startMultiCpu a r cb = do
+  cref <- newIORef [[]]
+  _ <- parseCpuData cref
+  runM a multiCpuConfig (runMultiCpu cref) r cb