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|
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.Monitors.Batt
-- Copyright : (c) Andrea Rossato
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Andrea Rossato <andrea.rossato@unibz.it>
-- Stability : unstable
-- Portability : unportable
--
-- A battery monitor for Xmobar
--
-----------------------------------------------------------------------------
module Plugins.Monitors.Batt where
import qualified Data.ByteString.Lazy.Char8 as B
import Plugins.Monitors.Common
import System.Posix.Files (fileExist)
data Batt = Batt Float
| NA
battConfig :: IO MConfig
battConfig = mkMConfig
"Batt: <left>" -- template
["left"] -- available replacements
file2batfile :: String -> (String, String)
file2batfile s = ("/proc/acpi/battery/"++ s ++ "/info", "/proc/acpi/battery/"++ s ++ "/state")
readFileBatt :: (String, String) -> IO (B.ByteString, B.ByteString)
readFileBatt (i,s) =
do a <- rf i
b <- rf s
return (a,b)
where rf file = do
f <- fileExist file
if f then B.readFile file else return B.empty
parseBATT :: [(String, String)] -> IO Batt
parseBATT bfs =
do [(a0,b0),(a1,b1),(a2,b2)] <- mapM readFileBatt (take 3 $ bfs ++ repeat ("",""))
let sp p s = case stringParser p s of
[] -> 0
x -> read x
(f0, p0) = (sp (3,2) a0, sp (2,4) b0)
(f1, p1) = (sp (3,2) a1, sp (2,4) b1)
(f2, p2) = (sp (3,2) a2, sp (2,4) b2)
left = (p0 + p1 + p2) / (f0 + f1 + f2) --present / full
return $ if isNaN left then NA else Batt left
formatBatt :: Float -> Monitor [String]
formatBatt x =
do let f s = floatToPercent (s / 100)
l <- showWithColors f (x * 100)
return [l]
runBatt :: [String] -> Monitor String
runBatt = runBatt' ["BAT0","BAT1","BAT2"]
runBatt' :: [String] -> [String] -> Monitor String
runBatt' bfs _ = do
c <- io $ parseBATT (map file2batfile bfs)
case c of
Batt x -> do l <- formatBatt x
parseTemplate l
NA -> return "N/A"
|
