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diff --git a/src/Xmobar/Plugins/Monitors/Common/Types.hs b/src/Xmobar/Plugins/Monitors/Common/Types.hs
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+------------------------------------------------------------------------------
+-- |
+-- Module: Xmobar.Plugins.Monitors.Types
+-- Copyright: (c) 2018 Jose Antonio Ortega Ruiz
+-- License: BSD3-style (see LICENSE)
+--
+-- Maintainer: jao@gnu.org
+-- Stability: unstable
+-- Portability: portable
+-- Created: Sun Dec 02, 2018 04:31
+--
+--
+-- Type definitions and constructors for Monitors
+--
+------------------------------------------------------------------------------
+
+
+module Xmobar.Plugins.Monitors.Common.Types ( Monitor
+                                            , MConfig (..)
+                                            , Opts (..)
+                                            , Selector
+                                            , setConfigValue
+                                            , getConfigValue
+                                            , mkMConfig
+                                            , io
+                                            ) where
+
+import Data.IORef
+import Control.Monad.Reader
+
+type Monitor a = ReaderT MConfig IO a
+
+io :: IO a -> Monitor a
+io = liftIO
+
+data MConfig =
+    MC { normalColor :: IORef (Maybe String)
+       , low :: IORef Int
+       , lowColor :: IORef (Maybe String)
+       , high :: IORef Int
+       , highColor :: IORef (Maybe String)
+       , template :: IORef String
+       , export :: IORef [String]
+       , ppad :: IORef Int
+       , decDigits :: IORef Int
+       , minWidth :: IORef Int
+       , maxWidth :: IORef Int
+       , maxWidthEllipsis :: IORef String
+       , padChars :: IORef String
+       , padRight :: IORef Bool
+       , barBack :: IORef String
+       , barFore :: IORef String
+       , barWidth :: IORef Int
+       , useSuffix :: IORef Bool
+       , naString :: IORef String
+       , maxTotalWidth :: IORef Int
+       , maxTotalWidthEllipsis :: IORef String
+       }
+
+-- | from 'http:\/\/www.haskell.org\/hawiki\/MonadState'
+type Selector a = MConfig -> IORef a
+
+sel :: Selector a -> Monitor a
+sel s =
+    do hs <- ask
+       liftIO $ readIORef (s hs)
+
+mods :: Selector a -> (a -> a) -> Monitor ()
+mods s m =
+    do v <- ask
+       io $ modifyIORef (s v) m
+
+setConfigValue :: a -> Selector a -> Monitor ()
+setConfigValue v s =
+       mods s (const v)
+
+getConfigValue :: Selector a -> Monitor a
+getConfigValue = sel
+
+mkMConfig :: String
+          -> [String]
+          -> IO MConfig
+mkMConfig tmpl exprts =
+    do lc <- newIORef Nothing
+       l  <- newIORef 33
+       nc <- newIORef Nothing
+       h  <- newIORef 66
+       hc <- newIORef Nothing
+       t  <- newIORef tmpl
+       e  <- newIORef exprts
+       p  <- newIORef 0
+       d  <- newIORef 0
+       mn <- newIORef 0
+       mx <- newIORef 0
+       mel <- newIORef ""
+       pc <- newIORef " "
+       pr <- newIORef False
+       bb <- newIORef ":"
+       bf <- newIORef "#"
+       bw <- newIORef 10
+       up <- newIORef False
+       na <- newIORef "N/A"
+       mt <- newIORef 0
+       mtel <- newIORef ""
+       return $ MC nc l lc h hc t e p d mn mx mel pc pr bb bf bw up na mt mtel
+
+data Opts = HighColor String
+          | NormalColor String
+          | LowColor String
+          | Low String
+          | High String
+          | Template String
+          | PercentPad String
+          | DecDigits String
+          | MinWidth String
+          | MaxWidth String
+          | Width String
+          | WidthEllipsis String
+          | PadChars String
+          | PadAlign String
+          | BarBack String
+          | BarFore String
+          | BarWidth String
+          | UseSuffix String
+          | NAString String
+          | MaxTotalWidth String
+          | MaxTotalWidthEllipsis String