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diff --git a/src/Xmobar/Run/Commands.hs b/src/Xmobar/Run/Commands.hs
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+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Xmobar.Commands
+-- Copyright   :  (c) Andrea Rossato
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A. Ortega Ruiz <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- The 'Exec' class and the 'Command' data type.
+--
+-- The 'Exec' class rappresents the executable types, whose constructors may
+-- appear in the 'Config.commands' field of the 'Config.Config' data type.
+--
+-- The 'Command' data type is for OS commands to be run by xmobar
+--
+-----------------------------------------------------------------------------
+
+module Xmobar.Run.Commands (Command (..), Exec (..)) where
+
+import Prelude
+import Control.Exception (handle, SomeException(..))
+import Data.Char
+import System.Process
+import System.Exit
+import System.IO (hClose)
+
+import Xmobar.System.Signal
+import Xmobar.Utils (hGetLineSafe, tenthSeconds)
+
+class Show e => Exec e where
+    alias   :: e -> String
+    alias   e    = takeWhile (not . isSpace) $ show e
+    rate    :: e -> Int
+    rate    _    = 10
+    run     :: e -> IO String
+    run     _    = return ""
+    start   :: e -> (String -> IO ()) -> IO ()
+    start   e cb = go
+        where go = run e >>= cb >> tenthSeconds (rate e) >> go
+    trigger :: e -> (Maybe SignalType -> IO ()) -> IO ()
+    trigger _ sh  = sh Nothing
+
+data Command = Com Program Args Alias Rate
+             | ComX Program Args String Alias Rate
+               deriving (Show,Read,Eq)
+
+type Args    = [String]
+type Program = String
+type Alias   = String
+type Rate    = Int
+
+instance Exec Command where
+    alias (ComX p _ _ a _) =
+      if p /= "" then (if a == "" then p else a) else ""
+    alias (Com p a al r) = alias (ComX p a "" al r)
+    start (Com p as al r) cb =
+      start (ComX p as ("Could not execute command " ++ p) al r) cb
+    start (ComX prog args msg _ r) cb = if r > 0 then go else exec
+        where go = exec >> tenthSeconds r >> go
+              exec = do
+                (i,o,e,p) <- runInteractiveProcess prog args Nothing Nothing
+                exit <- waitForProcess p
+                let closeHandles = hClose o >> hClose i >> hClose e
+                    getL = handle (\(SomeException _) -> return "")
+                                  (hGetLineSafe o)
+                case exit of
+                  ExitSuccess -> do str <- getL
+                                    closeHandles
+                                    cb str
+                  _ -> closeHandles >> cb msg