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diff --git a/src/Xmobar/Plugins/Monitors/Batt/Common.hs b/src/Xmobar/Plugins/Monitors/Batt/Common.hs
new file mode 100644
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+++ b/src/Xmobar/Plugins/Monitors/Batt/Common.hs
@@ -0,0 +1,57 @@
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.Monitors.Batt.Common
+-- Copyright   :  (c) 2010, 2011, 2012, 2013, 2015, 2016, 2018, 2019 Jose A Ortega
+--                (c) 2010 Andrea Rossato, Petr Rockai
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A. Ortega Ruiz <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A battery monitor for Xmobar
+--
+-----------------------------------------------------------------------------
+
+module Xmobar.Plugins.Monitors.Batt.Common (BattOpts(..)
+                                           , Result(..)
+                                           , Status(..)
+                                           , maybeAlert) where
+
+import System.Process (system)
+import Control.Monad (unless, void)
+import Xmobar.Plugins.Monitors.Common
+
+data Status = Charging | Discharging | Full | Idle | Unknown deriving (Read, Eq)
+-- Result perc watts time-seconds Status
+data Result = Result Float Float Float Status | NA
+
+data BattOpts = BattOpts
+  { onString :: String
+  , offString :: String
+  , idleString :: String
+  , posColor :: Maybe String
+  , lowWColor :: Maybe String
+  , mediumWColor :: Maybe String
+  , highWColor :: Maybe String
+  , lowThreshold :: Float
+  , highThreshold :: Float
+  , onLowAction :: Maybe String
+  , actionThreshold :: Float
+  , onlineFile :: FilePath
+  , scale :: Float
+  , onIconPattern :: Maybe IconPattern
+  , offIconPattern :: Maybe IconPattern
+  , idleIconPattern :: Maybe IconPattern
+  , lowString :: String
+  , mediumString :: String
+  , highString :: String
+  , incPerc :: Bool
+  }
+
+maybeAlert :: BattOpts -> Float -> IO ()
+maybeAlert opts left =
+  case onLowAction opts of
+    Nothing -> return ()
+    Just x -> unless (isNaN left || actionThreshold opts < 100 * left)
+                $ void $ system x