From 4d1402a1a7d87767267d48a77998e4fb13395b31 Mon Sep 17 00:00:00 2001
From: Pavan Rikhi <pavan.rikhi@gmail.com>
Date: Sat, 17 Mar 2018 22:48:24 -0400
Subject: Split Modules into Library & Executable Structure

Move the Main module to a new `app` directory. All other modules have
been nested under the `Xmobar` name. Lots of module headers & imports
were updated.
---
 src/Xmobar/Plugins/Monitors/Cpu.hs | 88 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 src/Xmobar/Plugins/Monitors/Cpu.hs

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

diff --git a/src/Xmobar/Plugins/Monitors/Cpu.hs b/src/Xmobar/Plugins/Monitors/Cpu.hs
new file mode 100644
index 0000000..6befe7d
--- /dev/null
+++ b/src/Xmobar/Plugins/Monitors/Cpu.hs
@@ -0,0 +1,88 @@
+-----------------------------------------------------------------------------
+-- |
+-- 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) 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
+
+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 }) "") ""
+  ]
+
+parseOpts :: [String] -> IO CpuOpts
+parseOpts argv =
+  case getOpt Permute options argv of
+    (o, _, []) -> return $ foldr id defaultOpts o
+    (_, _, errs) -> ioError . userError $ concat errs
+
+cpuConfig :: IO MConfig
+cpuConfig = mkMConfig
+       "Cpu: <total>%"
+       ["bar","vbar","ipat","total","user","nice","system","idle","iowait"]
+
+type CpuDataRef = IORef [Int]
+
+cpuData :: IO [Int]
+cpuData = cpuParser `fmap` B.readFile "/proc/stat"
+
+cpuParser :: B.ByteString -> [Int]
+cpuParser = map (read . B.unpack) . tail . B.words . head . B.lines
+
+parseCpu :: CpuDataRef -> IO [Float]
+parseCpu cref =
+    do a <- readIORef cref
+       b <- cpuData
+       writeIORef cref b
+       let dif = zipWith (-) b a
+           tot = fromIntegral $ sum dif
+           percent = map ((/ tot) . fromIntegral) dif
+       return percent
+
+formatCpu :: CpuOpts -> [Float] -> Monitor [String]
+formatCpu _ [] = return $ replicate 8 ""
+formatCpu opts xs = do
+  let t = sum $ take 3 xs
+  b <- showPercentBar (100 * t) t
+  v <- showVerticalBar (100 * t) t
+  d <- showIconPattern (loadIconPattern opts) t
+  ps <- showPercentsWithColors (t:xs)
+  return (b:v:d:ps)
+
+runCpu :: CpuDataRef -> [String] -> Monitor String
+runCpu cref argv =
+    do c <- io (parseCpu cref)
+       opts <- io $ parseOpts argv
+       l <- formatCpu opts c
+       parseTemplate l
+
+startCpu :: [String] -> Int -> (String -> IO ()) -> IO ()
+startCpu a r cb = do
+  cref <- newIORef []
+  _ <- parseCpu cref
+  runM a cpuConfig (runCpu cref) r cb
-- 
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