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|
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.Monitors.MultiCpu
-- Copyright : (c) Jose A Ortega Ruiz
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Jose A Ortega <jao@gnu.org>
-- Stability : unstable
-- Portability : unportable
--
-- A multi-cpu monitor for Xmobar
--
-----------------------------------------------------------------------------
module Plugins.Monitors.MultiCpu (startMultiCpu) where
import Plugins.Monitors.Common
import Control.Applicative ((<$>))
import qualified Data.ByteString.Lazy.Char8 as B
import Data.List (isPrefixOf, transpose, unfoldr)
import Data.IORef (IORef, newIORef, readIORef, writeIORef)
variables :: [String]
variables = ["bar", "vbar","total","user","nice","system","idle"]
vNum :: Int
vNum = length variables
multiCpuConfig :: IO MConfig
multiCpuConfig =
mkMConfig "Cpu: <total>%" $
["auto" ++ k | k <- variables] ++
[ k ++ n | n <- "" : map show [0 :: Int ..]
, k <- variables]
type CpuDataRef = IORef [[Float]]
cpuData :: IO [[Float]]
cpuData = parse `fmap` B.readFile "/proc/stat"
where parse = map parseList . cpuLists
cpuLists = takeWhile isCpu . map B.words . B.lines
isCpu (w:_) = "cpu" `isPrefixOf` B.unpack w
isCpu _ = False
parseList = map (parseFloat . B.unpack) . tail
parseCpuData :: CpuDataRef -> IO [[Float]]
parseCpuData cref =
do as <- readIORef cref
bs <- cpuData
writeIORef cref bs
let p0 = zipWith percent bs as
return p0
percent :: [Float] -> [Float] -> [Float]
percent b a = if tot > 0 then map (/ tot) $ take 4 dif else [0, 0, 0, 0]
where dif = zipWith (-) b a
tot = sum dif
formatMultiCpus :: [[Float]] -> Monitor [String]
formatMultiCpus [] = return []
formatMultiCpus xs = concat <$> mapM formatCpu xs
formatCpu :: [Float] -> Monitor [String]
formatCpu xs
| length xs < 4 = showPercentsWithColors $ replicate vNum 0.0
| otherwise = let t = sum $ take 3 xs
in do b <- showPercentBar (100 * t) t
h <- showVerticalBar (100 * t) t
ps <- showPercentsWithColors (t:xs)
return (b:h:ps)
splitEvery :: (Eq a) => Int -> [a] -> [[a]]
splitEvery n = unfoldr (\x -> if null x then Nothing else Just $ splitAt n x)
groupData :: [String] -> [[String]]
groupData = transpose . tail . splitEvery vNum
formatAutoCpus :: [String] -> Monitor [String]
formatAutoCpus [] = return $ replicate vNum ""
formatAutoCpus xs = return $ map unwords (groupData xs)
runMultiCpu :: CpuDataRef -> [String] -> Monitor String
runMultiCpu cref _ =
do c <- io $ parseCpuData cref
l <- formatMultiCpus c
a <- formatAutoCpus l
parseTemplate $ a ++ l
startMultiCpu :: [String] -> Int -> (String -> IO ()) -> IO ()
startMultiCpu a r cb = do
cref <- newIORef [[]]
_ <- parseCpuData cref
runM a multiCpuConfig (runMultiCpu cref) r cb
|
