From 1209c4f6bb3218cacdfbd7337488abf4bcb05245 Mon Sep 17 00:00:00 2001
From: Andrea Rossato <andrea.rossato@ing.unitn.it>
Date: Tue, 24 Jul 2007 11:44:02 +0200
Subject: Batt.hs: refactor to reduce resource usage

darcs-hash:20070724094402-d6583-3dcd0ad09f538cfa4d34ff7ad636e8b179866500.gz
---
 Plugins/Monitors/Batt.hs | 52 ++++++++++--------------------------------------
 1 file changed, 11 insertions(+), 41 deletions(-)

(limited to 'Plugins/Monitors/Batt.hs')

diff --git a/Plugins/Monitors/Batt.hs b/Plugins/Monitors/Batt.hs
index 44ee378..0c2219a 100644
--- a/Plugins/Monitors/Batt.hs
+++ b/Plugins/Monitors/Batt.hs
@@ -15,17 +15,8 @@
 module Plugins.Monitors.Batt where
 
 import qualified Data.ByteString.Lazy.Char8 as B
-import qualified Data.Map as M
-import Data.Char
-import Data.List
-import Data.Maybe
-import Control.Monad
-import System.Posix.Files
-
 import Plugins.Monitors.Common
 
-type BattMap = M.Map String Integer
-
 battConfig :: IO MConfig
 battConfig = mkMConfig
        "Batt: <left>" -- template
@@ -37,44 +28,23 @@ fileB1 = ("/proc/acpi/battery/BAT1/info", "/proc/acpi/battery/BAT1/state")
 fileB2 :: (String, String)
 fileB2 = ("/proc/acpi/battery/BAT2/info", "/proc/acpi/battery/BAT2/state")
 
-checkFileBatt :: (String, String) -> IO Bool
-checkFileBatt (i,_) =
-    fileExist i
-
-readFileBatt :: (String, String) -> IO BattMap
+readFileBatt :: (String, String) -> IO (B.ByteString, B.ByteString)
 readFileBatt (i,s) = 
     do a <- catch (B.readFile i) (const $ return B.empty)
        b <- catch (B.readFile s) (const $ return B.empty)
-       return $ mkMap a b
-
-mkMap :: B.ByteString -> B.ByteString -> BattMap
-mkMap a b = M.fromList . mapMaybe parseLine $ concatMap B.lines [a, b]
-
-parseLine :: B.ByteString -> Maybe (String, Integer)
-parseLine s = do
-    let (k, r) = B.break (==':') s
-        (_, r') = B.span (isSpace) (B.tail r)
-        (v, _) = B.span (isDigit) r'
-        (ks, vs) = (B.unpack k, B.unpack v)
-    guard $ all (> 0) (map B.length [r, k, v])
-    return (ks, read vs)
+       return (a,b)
 
 parseBATT :: IO Float
 parseBATT =
-    do m1 <- readFileBatt fileB1
-       m2 <- readFileBatt fileB2
-       let pr1 = M.findWithDefault 0 remKey m1
-           fu1 = M.findWithDefault 0 fullKey m1
-           pr2 = M.findWithDefault 0 remKey m2
-           fu2 = M.findWithDefault 0 fullKey m2
-           pr  = pr1 + pr2
-           fu  = fu1 + fu2
-           pc  = if fu /= 0 then fromInteger pr / fromInteger fu else 0.0
-       return pc
-  where
-    remKey = "remaining capacity"
-    fullKey = "last full capacity"
-
+    do (a1,b1) <- readFileBatt fileB1
+       (a2,b2) <- readFileBatt fileB2
+       let sp p s = case stringParser p s of
+                      [] -> 0
+                      x -> read x
+           (f1, p1) = (sp (3,2) a1, sp (2,4) b1)
+           (f2, p2) = (sp (3,2) a2, sp (2,4) b2)
+       return $ (p1 + p2) / (f1 + f2) --present / full
+      
 formatBatt :: Float -> Monitor [String] 
 formatBatt x =
     do let f s = floatToPercent (s / 100)
-- 
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