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|
{-#LANGUAGE RecordWildCards#-}
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.Monitors.Cpu
-- 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
( startCpu
, runCpu
, cpuConfig
, CpuDataRef
, CpuOpts
, CpuArguments
, parseCpu
, getArguments
) where
import Xmobar.Plugins.Monitors.Common
import qualified Data.ByteString.Lazy.Char8 as B
import Data.IORef (IORef, newIORef, readIORef, writeIORef)
import System.Console.GetOpt
import Xmobar.App.Timer (doEveryTenthSeconds)
import Control.Monad (void)
newtype CpuOpts = CpuOpts
{ loadIconPattern :: Maybe IconPattern
}
defaultOpts :: CpuOpts
defaultOpts = CpuOpts
{ loadIconPattern = Nothing
}
options :: [OptDescr (CpuOpts -> CpuOpts)]
options =
[ Option "" ["load-icon-pattern"] (ReqArg (\x o ->
o { loadIconPattern = Just $ parseIconPattern x }) "") ""
]
barField :: String
barField = "bar"
vbarField :: String
vbarField = "vbar"
ipatField :: String
ipatField = "ipat"
totalField :: String
totalField = "total"
userField :: String
userField = "user"
niceField :: String
niceField = "nice"
systemField :: String
systemField = "system"
idleField :: String
idleField = "idle"
iowaitField :: String
iowaitField = "iowait"
cpuConfig :: IO MConfig
cpuConfig =
mkMConfig
"Cpu: <total>%"
[ barField
, vbarField
, ipatField
, totalField
, userField
, niceField
, systemField
, idleField
, iowaitField
]
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
data CpuData = CpuData {
cpuUser :: !Float,
cpuNice :: !Float,
cpuSystem :: !Float,
cpuIdle :: !Float,
cpuIowait :: !Float,
cpuTotal :: !Float
}
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
data Field = Field {
fieldName :: !String,
fieldCompute :: !ShouldCompute
} deriving (Eq, Ord, Show)
data ShouldCompute = Compute | Skip deriving (Eq, Ord, Show)
formatField :: PureConfig -> CpuOpts -> CpuData -> Field -> IO String
formatField cpuParams cpuOpts cpuInfo@CpuData{..} Field{..}
| fieldName == barField = if fieldCompute == Compute
then pShowPercentBar cpuParams (100 * cpuTotal) cpuTotal
else pure []
| fieldName == vbarField = if fieldCompute == Compute
then pShowVerticalBar cpuParams (100 * cpuTotal) cpuTotal
else pure []
| fieldName == ipatField = if fieldCompute == Compute
then pShowIconPattern (loadIconPattern cpuOpts) cpuTotal
else pure []
| otherwise = if fieldCompute == Compute
then pShowPercentWithColors cpuParams (getFieldValue fieldName cpuInfo)
else pure []
getFieldValue :: String -> CpuData -> Float
getFieldValue field CpuData{..}
| field == barField = cpuTotal
| field == vbarField = cpuTotal
| field == ipatField = cpuTotal
| field == totalField = cpuTotal
| field == userField = cpuUser
| field == niceField = cpuNice
| field == systemField = cpuSystem
| field == idleField = cpuIdle
| otherwise = cpuIowait
computeFields :: [String] -> [String] -> [Field]
computeFields [] _ = []
computeFields (x:xs) inputFields =
if x `elem` inputFields
then (Field {fieldName = x, fieldCompute = Compute}) :
(computeFields xs inputFields)
else (Field {fieldName = x, fieldCompute = Skip}) : (computeFields xs inputFields)
formatCpu :: CpuArguments -> CpuData -> IO [String]
formatCpu CpuArguments{..} cpuInfo = do
strs <- mapM (formatField cpuParams cpuOpts cpuInfo) cpuFields
pure $ filter (not . null) strs
getInputFields :: CpuArguments -> [String]
getInputFields CpuArguments{..} = map (\(_,f,_) -> f) cpuInputTemplate
optimizeAllTemplate :: CpuArguments -> CpuArguments
optimizeAllTemplate args@CpuArguments{..} =
let inputFields = getInputFields args
allTemplates = filter (\(field, _) -> field `elem` inputFields) cpuAllTemplate
in args { cpuAllTemplate = allTemplates }
data CpuArguments = CpuArguments {
cpuDataRef :: !CpuDataRef,
cpuParams :: !PureConfig,
cpuArgs :: ![String],
cpuOpts :: !CpuOpts,
cpuInputTemplate :: ![(String, String, String)], -- [("Cpu: ","total","% "),("","user","%")]
cpuAllTemplate :: ![(String, [(String, String, String)])], -- [("bar",[]),("vbar",[]),("ipat",[]),("total",[]),...]
cpuFields :: ![Field]
}
getArguments :: [String] -> IO CpuArguments
getArguments cpuArgs = do
initCpuData <- cpuData
cpuDataRef <- newIORef initCpuData
void $ parseCpu cpuDataRef
cpuParams <- computePureConfig cpuArgs cpuConfig
cpuInputTemplate <- runTemplateParser cpuParams
cpuAllTemplate <- runExportParser (pExport cpuParams)
nonOptions <- case getOpt Permute pluginOptions cpuArgs of
(_, n, []) -> pure n
(_,_,errs) -> error $ "getArguments: " <> show errs
cpuOpts <- case getOpt Permute options nonOptions of
(o, _, []) -> pure $ foldr id defaultOpts o
(_,_,errs) -> error $ "getArguments options: " <> show errs
let cpuFields = computeFields (map fst cpuAllTemplate) (map (\(_,f,_) -> f) cpuInputTemplate)
pure $ optimizeAllTemplate CpuArguments{..}
runCpu :: CpuArguments -> IO String
runCpu args@CpuArguments{..} = do
cpuValue <- parseCpu cpuDataRef
temMonitorValues <- formatCpu args cpuValue
let templateInput = TemplateInput { temInputTemplate = cpuInputTemplate, temAllTemplate = cpuAllTemplate, ..}
pureParseTemplate cpuParams templateInput
startCpu :: [String] -> Int -> (String -> IO ()) -> IO ()
startCpu args refreshRate cb = do
cpuArgs <- getArguments args
doEveryTenthSeconds refreshRate (runCpu cpuArgs >>= cb)
|
