From b99a8a6833a1b38882b463fd72784cd6d6f91d9e Mon Sep 17 00:00:00 2001
From: Michal Zielonka <michal.zielonka.8001@gmail.com>
Date: Thu, 7 Oct 2021 23:25:09 +0200
Subject: try to reorganize modules per os

We should make better split os specify code for FreeBSD and Linux.
Idea comes from @liskin.
---
 src/Xmobar/Plugins/Monitors/Cpu/Linux.hs | 61 ++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 src/Xmobar/Plugins/Monitors/Cpu/Linux.hs

(limited to 'src/Xmobar/Plugins/Monitors/Cpu/Linux.hs')

diff --git a/src/Xmobar/Plugins/Monitors/Cpu/Linux.hs b/src/Xmobar/Plugins/Monitors/Cpu/Linux.hs
new file mode 100644
index 0000000..39baea6
--- /dev/null
+++ b/src/Xmobar/Plugins/Monitors/Cpu/Linux.hs
@@ -0,0 +1,61 @@
+-----------------------------------------------------------------------------
+-- |
+-- 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
-- 
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