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|
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.Monitors.Cpu.Linux
-- Copyright : (c) 2011, 2017 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 Xmobar.Plugins.Monitors.Cpu.Linux (parseCpu
, CpuDataRef
, cpuData) where
import Xmobar.Plugins.Monitors.Cpu.Common (CpuData(..))
import qualified Data.ByteString.Lazy.Char8 as B
import Data.IORef (IORef, readIORef, writeIORef)
type CpuDataRef = IORef [Int]
-- Details about the fields here: https://www.kernel.org/doc/Documentation/filesystems/proc.txt
cpuData :: IO [Int]
cpuData = cpuParser <$> B.readFile "/proc/stat"
readInt :: B.ByteString -> Int
readInt bs = case B.readInt bs of
Nothing -> 0
Just (i, _) -> i
cpuParser :: B.ByteString -> [Int]
cpuParser = map readInt . tail . B.words . head . B.lines
convertToCpuData :: [Float] -> CpuData
convertToCpuData (u:n:s:ie:iw:_) =
CpuData
{ cpuUser = u
, cpuNice = n
, cpuSystem = s
, cpuIdle = ie
, cpuIowait = iw
, cpuTotal = sum [u, n, s]
}
convertToCpuData args = error $ "convertToCpuData: Unexpected list" <> show args
parseCpu :: CpuDataRef -> IO CpuData
parseCpu cref =
do a <- readIORef cref
b <- cpuData
writeIORef cref b
let dif = zipWith (-) b a
tot = fromIntegral $ sum dif
safeDiv n = case tot of
0 -> 0
v -> fromIntegral n / v
percent = map safeDiv dif
return $ convertToCpuData percent
|
