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authorjao <jao@gnu.org>2022-03-30 02:37:00 +0100
committerjao <jao@gnu.org>2022-03-30 02:37:00 +0100
commit4f4e8de1d8b4d33e02057d085399d25e05d87a17 (patch)
tree1b0a7af4622052c8dba7d3a3f34e0a52a1f4acdf /src/Xmobar/Plugins/Monitors/Load.hs
parent28e51ce251bb7ecf8d688c0bdfb701c94b1fa7e2 (diff)
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Load: new load average monitor
Closes #208
Diffstat (limited to 'src/Xmobar/Plugins/Monitors/Load.hs')
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diff --git a/src/Xmobar/Plugins/Monitors/Load.hs b/src/Xmobar/Plugins/Monitors/Load.hs
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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)
+
+-- | 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
+ parseTemplate =<< mapM (showWithColors $ showDigits 2) l)
+ else
+ return "Load: N/A"