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diff --git a/src/lib/Xmobar/Plugins/Monitors/Swap.hs b/src/lib/Xmobar/Plugins/Monitors/Swap.hs
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+-----------------------------------------------------------------------------
+-- |
+-- Module : Plugins.Monitors.Swap
+-- Copyright : (c) Andrea Rossato
+-- License : BSD-style (see LICENSE)
+--
+-- Maintainer : Jose A. Ortega Ruiz <jao@gnu.org>
+-- Stability : unstable
+-- Portability : unportable
+--
+-- A swap usage monitor for Xmobar
+--
+-----------------------------------------------------------------------------
+
+module Xmobar.Plugins.Monitors.Swap where
+
+import Xmobar.Plugins.Monitors.Common
+
+import qualified Data.ByteString.Lazy.Char8 as B
+
+swapConfig :: IO MConfig
+swapConfig = mkMConfig
+ "Swap: <usedratio>%" -- template
+ ["usedratio", "total", "used", "free"] -- available replacements
+
+fileMEM :: IO B.ByteString
+fileMEM = B.readFile "/proc/meminfo"
+
+parseMEM :: IO [Float]
+parseMEM =
+ do file <- fileMEM
+ let li i l
+ | l /= [] = head l !! i
+ | otherwise = B.empty
+ fs s l
+ | null l = False
+ | otherwise = head l == B.pack s
+ get_data s = flip (/) 1024 . read . B.unpack . li 1 . filter (fs s)
+ st = map B.words . B.lines $ file
+ tot = get_data "SwapTotal:" st
+ free = get_data "SwapFree:" st
+ return [(tot - free) / tot, tot, tot - free, free]
+
+formatSwap :: [Float] -> Monitor [String]
+formatSwap (r:xs) = do
+ d <- getConfigValue decDigits
+ other <- mapM (showWithColors (showDigits d)) xs
+ ratio <- showPercentWithColors r
+ return $ ratio:other
+formatSwap _ = return $ replicate 4 "N/A"
+
+runSwap :: [String] -> Monitor String
+runSwap _ =
+ do m <- io parseMEM
+ l <- formatSwap m
+ parseTemplate l