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|
-----------------------------------------------------------------------------
-- |
-- Module : Xmobar.Commands
-- Copyright : (c) Andrea Rossato
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Andrea Rossato <andrea.rossato@unibz.it>
-- 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 stores the monitors to be run internally by
-- Xmobar.
--
-----------------------------------------------------------------------------
module Commands where
import System.Process
import System.Exit
import System.IO (hClose, hGetLine)
class Exec e where
run :: e -> IO String
rate :: e -> Int
alias :: e -> String
data Command = Com Program Args Alias Rate
deriving (Show,Read,Eq)
type Args = [String]
type Program = String
type Alias = String
type Rate = Int
instance Exec Command where
alias (Com p _ a _) | p /= "" = if a == "" then p else a
| otherwise = ""
rate (Com _ _ _ r) = r
run (Com prog args _ _) = do (i,o,e,p) <- runInteractiveCommand (prog ++ concat (map (' ':) args))
exit <- waitForProcess p
let closeHandles = do hClose o
hClose i
hClose e
case exit of
ExitSuccess -> do str <- hGetLine o
closeHandles
return str
_ -> do closeHandles
return $ "Could not execute command " ++ prog
|
