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|
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.Monitors.Cpu
-- Copyright : (c) 2011 Jose Antonio Ortega Ruiz
-- (c) 2007-2010 Andrea Rossato
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Jose A. Ortega Ruiz <jao@gnu.org>
-- Stability : unstable
-- Portability : unportable
--
-- A cpu monitor for Xmobar
--
-----------------------------------------------------------------------------
module Plugins.Monitors.Cpu (startCpu) where
import Plugins.Monitors.Common
import qualified Data.ByteString.Lazy.Char8 as B
import Data.IORef (IORef, newIORef, readIORef, writeIORef)
import System.Console.GetOpt
data CpuOpts = CpuOpts
{ loadDynamicString :: Maybe DynamicString
}
defaultOpts :: CpuOpts
defaultOpts = CpuOpts
{ loadDynamicString = Nothing
}
options :: [OptDescr (CpuOpts -> CpuOpts)]
options =
[ Option "" ["load-dynamic-string"] (ReqArg (\x o ->
o { loadDynamicString = Just $ parseDynamicString x }) "") ""
]
parseOpts :: [String] -> IO CpuOpts
parseOpts argv =
case getOpt Permute options argv of
(o, _, []) -> return $ foldr id defaultOpts o
(_, _, errs) -> ioError . userError $ concat errs
cpuConfig :: IO MConfig
cpuConfig = mkMConfig
"Cpu: <total>%"
["bar","vbar","dstr","total","user","nice","system","idle","iowait"]
type CpuDataRef = IORef [Int]
cpuData :: IO [Int]
cpuData = cpuParser `fmap` B.readFile "/proc/stat"
cpuParser :: B.ByteString -> [Int]
cpuParser = map (read . B.unpack) . tail . B.words . head . B.lines
parseCpu :: CpuDataRef -> IO [Float]
parseCpu cref =
do a <- readIORef cref
b <- cpuData
writeIORef cref b
let dif = zipWith (-) b a
tot = fromIntegral $ sum dif
percent = map ((/ tot) . fromIntegral) dif
return percent
formatCpu :: CpuOpts -> [Float] -> Monitor [String]
formatCpu _ [] = return $ replicate 8 ""
formatCpu opts xs = do
let t = sum $ take 3 xs
b <- showPercentBar (100 * t) t
v <- showVerticalBar (100 * t) t
d <- showDynamicString (loadDynamicString opts) t
ps <- showPercentsWithColors (t:xs)
return (b:v:d:ps)
runCpu :: CpuDataRef -> [String] -> Monitor String
runCpu cref argv =
do c <- io (parseCpu cref)
opts <- io $ parseOpts argv
l <- formatCpu opts c
parseTemplate l
startCpu :: [String] -> Int -> (String -> IO ()) -> IO ()
startCpu a r cb = do
cref <- newIORef []
_ <- parseCpu cref
runM a cpuConfig (runCpu cref) r cb
|
