From 75780faeb8d16686f8bedd169e04b430b4618e19 Mon Sep 17 00:00:00 2001
From: "Jose A. Ortega Ruiz" <jao@gnu.org>
Date: Sun, 17 Jan 2010 23:15:00 +0100
Subject: New MultiCpu monitor that works like Cpu for multiple CPU cores

Ignore-this: 64152f888f1e007612dc8e1f1eace875

darcs-hash:20100117221500-40885-23930af67e2b5446712b1bced29ce56ec696965e.gz
---
 Plugins/Monitors.hs          |  4 +++
 Plugins/Monitors/MultiCpu.hs | 67 ++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 71 insertions(+)
 create mode 100644 Plugins/Monitors/MultiCpu.hs

diff --git a/Plugins/Monitors.hs b/Plugins/Monitors.hs
index 07662be..72e0d50 100644
--- a/Plugins/Monitors.hs
+++ b/Plugins/Monitors.hs
@@ -22,6 +22,7 @@ import Plugins.Monitors.Net
 import Plugins.Monitors.Mem
 import Plugins.Monitors.Swap
 import Plugins.Monitors.Cpu
+import Plugins.Monitors.MultiCpu
 import Plugins.Monitors.Batt
 import Plugins.Monitors.Thermal
 import Plugins.Monitors.CpuFreq
@@ -32,6 +33,7 @@ data Monitors = Weather Station   Args Rate
               | Memory            Args Rate
               | Swap              Args Rate
               | Cpu               Args Rate
+              | MultiCpu          Args Rate
               | Battery           Args Rate
               | BatteryP [String] Args Rate
               | Thermal   Zone    Args Rate
@@ -54,6 +56,7 @@ instance Exec Monitors where
     alias (Memory     _ _) = "memory"
     alias (Swap       _ _) = "swap"
     alias (Cpu        _ _) = "cpu"
+    alias (MultiCpu   _ _) = "multicpu"
     alias (Battery    _ _) = "battery"
     alias (BatteryP  _ _ _)= "battery"
     alias (CpuFreq    _ _) = "cpufreq"
@@ -64,6 +67,7 @@ instance Exec Monitors where
     start (Memory     a r) = runM a          memConfig      runMem      r
     start (Swap       a r) = runM a          swapConfig     runSwap     r
     start (Cpu        a r) = runM a          cpuConfig      runCpu      r
+    start (MultiCpu   a r) = runM a          multiCpuConfig runMultiCpu r
     start (Battery    a r) = runM a          battConfig     runBatt     r
     start (BatteryP s a r) = runM a          battConfig    (runBatt' s) r
     start (CpuFreq    a r) = runM a          cpuFreqConfig  runCpuFreq  r
diff --git a/Plugins/Monitors/MultiCpu.hs b/Plugins/Monitors/MultiCpu.hs
new file mode 100644
index 0000000..02fa842
--- /dev/null
+++ b/Plugins/Monitors/MultiCpu.hs
@@ -0,0 +1,67 @@
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.Monitors.MultiCpu
+-- Copyright   :  (c) Jose A Ortega Ruiz
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A Ortega <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A multi-cpu monitor for Xmobar
+--
+-----------------------------------------------------------------------------
+
+module Plugins.Monitors.MultiCpu where
+
+import Plugins.Monitors.Common
+import qualified Data.ByteString.Lazy.Char8 as B
+import Data.List(isPrefixOf)
+
+multiCpuConfig :: IO MConfig
+multiCpuConfig = mkMConfig
+                 "Cpu: <total>"
+                 [ k ++ n | n <- "":(map show [0 :: Int ..])
+                          , k <- ["total","user","nice","system","idle"]]
+
+
+multiCpuData :: IO [[Float]]
+multiCpuData = do s <- B.readFile "/proc/stat"
+                  return $ multiCpuParser s
+
+multiCpuParser :: B.ByteString -> [[Float]]
+multiCpuParser = map (map read . tail) . lns
+  where lns = takeWhile isCpu . map unpW . B.lines
+        isCpu (w:_) = "cpu" `isPrefixOf` w
+        isCpu _ = False
+        unpW = map B.unpack . B.words
+
+parseMultiCpu :: IO [[Float]]
+parseMultiCpu =
+  do (as, bs) <- doActionTwiceWithDelay 350000 multiCpuData
+     let p0 = zipWith percent bs as
+     (as', bs') <- doActionTwiceWithDelay 350000 multiCpuData
+     let p1 = zipWith percent bs' as'
+     return $ zipWith (\x y -> zipWith (\a b -> (a + b) / 2.0) x y)  p1 p0
+
+percent :: [Float] -> [Float] -> [Float]
+percent b a = map (/ tot) $ take 4 dif
+  where dif = zipWith (-) b a
+        tot = foldr (+) 0 dif
+
+formatMultiCpus :: [[Float]] -> Monitor [String]
+formatMultiCpus [] = return $ take 15 (repeat "-1%")
+formatMultiCpus xs = fmap concat $ mapM formatMultiCpu xs
+
+formatMultiCpu :: [Float] -> Monitor [String]
+formatMultiCpu x
+  | length x < 4 = return $ take 5 (repeat "")
+  | otherwise  = mapM (showWithColors f) . map (* 100) $ (t:x)
+            where f s = floatToPercent (s / 100)
+                  t = foldr (+) 0 $ take 3 x
+
+runMultiCpu :: [String] -> Monitor String
+runMultiCpu _ =
+  do c <- io $ parseMultiCpu
+     l <- formatMultiCpus c
+     parseTemplate l
-- 
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