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|
-----------------------------------------------------------------------------
-- |
-- Module : Plugins.Monitors.Batt
-- Copyright : (c) 2010, 2011 Jose A Ortega
-- (c) 2010 Andrea Rossato, Petr Rockai
-- License : BSD-style (see LICENSE)
--
-- Maintainer : Jose A. Ortega Ruiz <jao@gnu.org>
-- Stability : unstable
-- Portability : unportable
--
-- A battery monitor for Xmobar
--
-----------------------------------------------------------------------------
{-# LANGUAGE BangPatterns #-}
module Plugins.Monitors.Batt ( battConfig, runBatt, runBatt' ) where
import Control.Exception (SomeException, handle)
import Plugins.Monitors.Common
import System.FilePath ((</>))
import System.IO (IOMode(ReadMode), hGetLine, withFile)
import System.Posix.Files (fileExist)
import System.Console.GetOpt
import qualified Data.ByteString.Lazy.Char8 as B
data BattOpts = BattOpts
{ onString :: String
, offString :: String
, posColor :: Maybe String
, lowWColor :: Maybe String
, mediumWColor :: Maybe String
, highWColor :: Maybe String
, lowThreshold :: Float
, highThreshold :: Float
, onlineFile :: FilePath
}
defaultOpts :: BattOpts
defaultOpts = BattOpts
{ onString = "On"
, offString = "Off"
, posColor = Nothing
, lowWColor = Nothing
, mediumWColor = Nothing
, highWColor = Nothing
, lowThreshold = -12
, highThreshold = -10
, onlineFile = "AC/online"
}
options :: [OptDescr (BattOpts -> BattOpts)]
options =
[ Option "O" ["on"] (ReqArg (\x o -> o { onString = x }) "") ""
, Option "o" ["off"] (ReqArg (\x o -> o { offString = x }) "") ""
, Option "p" ["positive"] (ReqArg (\x o -> o { posColor = Just x }) "") ""
, Option "l" ["low"] (ReqArg (\x o -> o { lowWColor = Just x }) "") ""
, Option "m" ["medium"] (ReqArg (\x o -> o { mediumWColor = Just x }) "") ""
, Option "h" ["high"] (ReqArg (\x o -> o { highWColor = Just x }) "") ""
, Option "L" ["lowt"] (ReqArg (\x o -> o { lowThreshold = read x }) "") ""
, Option "H" ["hight"] (ReqArg (\x o -> o { highThreshold = read x }) "") ""
, Option "f" ["online"] (ReqArg (\x o -> o { onlineFile = x }) "") ""
]
parseOpts :: [String] -> IO BattOpts
parseOpts argv =
case getOpt Permute options argv of
(o, _, []) -> return $ foldr id defaultOpts o
(_, _, errs) -> ioError . userError $ concat errs
data Result = Result Float Float Float String | NA
sysDir :: FilePath
sysDir = "/sys/class/power_supply"
battConfig :: IO MConfig
battConfig = mkMConfig
"Batt: <watts>, <left>% / <timeleft>" -- template
["leftbar", "left", "acstatus", "timeleft", "watts"] -- replacements
data Files = Files
{ fFull :: String
, fNow :: String
, fVoltage :: String
, fCurrent :: String
} | NoFiles
data Battery = Battery
{ full :: !Float
, now :: !Float
, voltage :: !Float
, current :: !Float
}
safeFileExist :: String -> IO Bool
safeFileExist f = handle noErrors $ fileExist f
where noErrors = const (return False) :: SomeException -> IO Bool
batteryFiles :: String -> IO Files
batteryFiles bat =
do is_charge <- safeFileExist $ prefix </> "charge_now"
is_energy <- safeFileExist $ prefix </> "energy_now"
is_current <- safeFileExist $ prefix </> "current_now"
let cf = if is_current then "current_now" else "power_now"
return $ case (is_charge, is_energy) of
(True, _) -> files "charge" cf
(_, True) -> files "energy" cf
_ -> NoFiles
where prefix = sysDir </> bat
files ch cf = Files { fFull = prefix </> ch ++ "_full"
, fNow = prefix </> ch ++ "_now"
, fCurrent = prefix </> cf
, fVoltage = prefix </> "voltage_now" }
haveAc :: FilePath -> IO Bool
haveAc f =
handle onError $ withFile (sysDir </> f) ReadMode (fmap (== "1") . hGetLine)
where onError = const (return False) :: SomeException -> IO Bool
readBattery :: Files -> IO Battery
readBattery NoFiles = return $ Battery 0 0 0 0
readBattery files =
do a <- grab $ fFull files -- microwatthours
b <- grab $ fNow files
c <- grab $ fVoltage files -- microvolts
d <- grab $ fCurrent files -- microwatts (huh!)
return $ Battery (3600 * a / 1000000) -- wattseconds
(3600 * b / 1000000) -- wattseconds
(c / 1000000) -- volts
(if c > 0 then (d / c) else -1) -- amperes
where grab f = handle onError (fmap (read . B.unpack) $ B.readFile f)
onError = const (return (-1)) :: SomeException -> IO Float
readBatteries :: BattOpts -> [Files] -> IO Result
readBatteries opts bfs =
do bats <- mapM readBattery (take 3 bfs)
ac <- haveAc (onlineFile opts)
let sign = if ac then 1 else -1
ft = sum (map full bats)
left = if ft > 0 then sum (map now bats) / ft else 0
watts = sign * sum (map voltage bats) * sum (map current bats)
time = if watts == 0 then 0 else sum $ map time' bats
mwatts = if watts == 0 then 1 else sign * watts
time' b = (if ac then full b - now b else now b) / mwatts
acstr = if ac then onString opts else offString opts
return $ if isNaN left then NA else Result left watts time acstr
runBatt :: [String] -> Monitor String
runBatt = runBatt' ["BAT0","BAT1","BAT2"]
runBatt' :: [String] -> [String] -> Monitor String
runBatt' bfs args = do
opts <- io $ parseOpts args
c <- io $ readBatteries opts =<< mapM batteryFiles bfs
case c of
Result x w t s ->
do l <- fmtPercent x
parseTemplate (l ++ s:[fmtTime $ floor t, fmtWatts w opts])
NA -> return "N/A"
where fmtPercent :: Float -> Monitor [String]
fmtPercent x = do
p <- showPercentWithColors x
b <- showPercentBar (100 * x) x
return [b, p]
fmtWatts x o = color x o $ showDigits 1 x ++ "W"
fmtTime :: Integer -> String
fmtTime x = hours ++ ":" ++ if length minutes == 2
then minutes else '0' : minutes
where hours = show (x `div` 3600)
minutes = show ((x `mod` 3600) `div` 60)
maybeColor Nothing _ = ""
maybeColor (Just c) str = "<fc=" ++ c ++ ">" ++ str ++ "</fc>"
color x o | x >= 0 = maybeColor (posColor o)
| x >= highThreshold o = maybeColor (highWColor o)
| x >= lowThreshold o = maybeColor (mediumWColor o)
| otherwise = maybeColor (lowWColor o)
|
