From e0c7868402dc99a06816f55d6249b1b9e6351122 Mon Sep 17 00:00:00 2001
From: Krzysztof Kosciuszkiewicz <k.kosciuszkiewicz@gmail.com>
Date: Mon, 16 Jul 2007 02:34:48 +0200
Subject: Fix parsing and processing data in Batt monitor.

Sometimes the monitor would crash due to bad index given to (!!). Now it
should be safe, as parsing is done differently.

darcs-hash:20070716003448-ba08c-4ae93a39919c2aee628825e5a9f7da8970dbcb8c.gz
---
 Plugins/Monitors/Batt.hs | 53 ++++++++++++++++++++++++++++++++++--------------
 1 file changed, 38 insertions(+), 15 deletions(-)

(limited to 'Plugins')

diff --git a/Plugins/Monitors/Batt.hs b/Plugins/Monitors/Batt.hs
index 79c0015..96cd8ef 100644
--- a/Plugins/Monitors/Batt.hs
+++ b/Plugins/Monitors/Batt.hs
@@ -15,10 +15,17 @@
 module Plugins.Monitors.Batt where
 
 import qualified Data.ByteString.Lazy.Char8 as B
+import qualified Data.Map as M
+import Data.Maybe
+import Data.Either
+import Control.Monad
+import Text.ParserCombinators.Parsec
 import System.Posix.Files
 
 import Plugins.Monitors.Common
 
+type BattMap = M.Map String Integer
+
 battConfig :: IO MConfig
 battConfig = mkMConfig
        "Batt: <left>" -- template
@@ -34,25 +41,41 @@ checkFileBatt :: (String, String) -> IO Bool
 checkFileBatt (i,_) =
     fileExist i
 
-readFileBatt :: (String, String) -> IO (B.ByteString, B.ByteString)
+readFileBatt :: (String, String) -> IO BattMap
 readFileBatt (i,s) = 
-    do a <- B.readFile i
-       b <- B.readFile s
-       return (a,b)
+    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 toAssoc $ concatMap B.lines [a, b]
+
+toAssoc bs = case parse parseLine "" (B.unpack bs) of
+                Left _ -> Nothing
+                Right a -> Just a
+
+parseLine = do hd <- many1 $ noneOf ":"
+               char ':'
+               spaces
+               tl <- many1 digit
+               let t = read tl
+               return (hd, t)
 
 parseBATT :: IO Float
 parseBATT =
-    do (a1,b1) <- readFileBatt fileB1
-       c <- checkFileBatt fileB2
-       let sp p s = read $ stringParser p s
-           (fu, pr) = (sp (3,2) a1, sp (2,4) b1)
-       case c of
-         True -> do (a2,b2) <- readFileBatt fileB1
-                    let full = fu + (sp (3,2) a2)
-                        present = pr + (sp (2,4) b2)
-                    return $ present / full
-         _ -> return $ pr / fu
-
+    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"
 
 formatBatt :: Float -> Monitor [String] 
 formatBatt x =
-- 
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