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|
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.Monitors.Load
-- Copyright : Finn Lawler
-- License : BSD-style (see LICENSE)
--
-- Author : Finn Lawler <flawler@cs.tcd.ie>
-- Maintainer : jao <mail@jao.io>
-- Stability : unstable
-- Portability : unportable
--
-- A load average monitor for Xmobar. Adapted from
-- Xmobar.Plugins.Monitors.Thermal by Juraj Hercek.
--
-----------------------------------------------------------------------------
module Xmobar.Plugins.Monitors.Load (loadConfig, runLoad) where
import Xmobar.Plugins.Monitors.Common
import qualified Data.ByteString.Lazy.Char8 as B
import System.Posix.Files (fileExist)
import Control.Monad (zipWithM)
-- | Default configuration.
loadConfig :: IO MConfig
loadConfig = mkMConfig
"Load: <load1>" -- template
["load1", "load5", "load15"] -- available replacements
-- | Parses the contents of a loadavg proc file, returning
-- the list of load averages
parseLoadAvgs :: B.ByteString -> [Float]
parseLoadAvgs =
map ((read :: String -> Float) . B.unpack) . take 3 . B.words . head . B.lines
-- | Retrieves load information. Returns the monitor string parsed
-- according to template (either default or user specified).
runLoad :: [String] -> Monitor String
runLoad _ = do
let file = "/proc/loadavg"
exists <- io $ fileExist file
if exists then
(do l <- io $ B.readFile file >>= return . parseLoadAvgs
d <- getConfigValue decDigits
let s = showWithColors . const . showDigits d
parseTemplate =<< zipWithM s l l)
else
return "Load: N/A"
|
