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+-----------------------------------------------------------------------------
+-- |
+-- Module : Plugins.Monitors.Batt
+-- Copyright : (c) 2010, 2011, 2012, 2013, 2015, 2016, 2018 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
+--
+-----------------------------------------------------------------------------
+
+module Xmobar.Plugins.Monitors.Batt ( battConfig, runBatt, runBatt' ) where
+
+import Control.Exception (SomeException, handle)
+import Xmobar.Plugins.Monitors.Common
+import System.FilePath ((</>))
+import System.IO (IOMode(ReadMode), hGetLine, withFile)
+import System.Posix.Files (fileExist)
+import System.Console.GetOpt
+import Data.List (sort, sortBy, group)
+import Data.Maybe (fromMaybe)
+import Data.Ord (comparing)
+import Text.Read (readMaybe)
+
+data BattOpts = BattOpts
+ { onString :: String
+ , offString :: String
+ , idleString :: String
+ , posColor :: Maybe String
+ , lowWColor :: Maybe String
+ , mediumWColor :: Maybe String
+ , highWColor :: Maybe String
+ , lowThreshold :: Float
+ , highThreshold :: Float
+ , onlineFile :: FilePath
+ , scale :: Float
+ , onIconPattern :: Maybe IconPattern
+ , offIconPattern :: Maybe IconPattern
+ , idleIconPattern :: Maybe IconPattern
+ }
+
+defaultOpts :: BattOpts
+defaultOpts = BattOpts
+ { onString = "On"
+ , offString = "Off"
+ , idleString = "On"
+ , posColor = Nothing
+ , lowWColor = Nothing
+ , mediumWColor = Nothing
+ , highWColor = Nothing
+ , lowThreshold = 10
+ , highThreshold = 12
+ , onlineFile = "AC/online"
+ , scale = 1e6
+ , onIconPattern = Nothing
+ , offIconPattern = Nothing
+ , idleIconPattern = Nothing
+ }
+
+options :: [OptDescr (BattOpts -> BattOpts)]
+options =
+ [ Option "O" ["on"] (ReqArg (\x o -> o { onString = x }) "") ""
+ , Option "o" ["off"] (ReqArg (\x o -> o { offString = x }) "") ""
+ , Option "i" ["idle"] (ReqArg (\x o -> o { idleString = 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 }) "") ""
+ , Option "s" ["scale"] (ReqArg (\x o -> o {scale = read x}) "") ""
+ , Option "" ["on-icon-pattern"] (ReqArg (\x o ->
+ o { onIconPattern = Just $ parseIconPattern x }) "") ""
+ , Option "" ["off-icon-pattern"] (ReqArg (\x o ->
+ o { offIconPattern = Just $ parseIconPattern x }) "") ""
+ , Option "" ["idle-icon-pattern"] (ReqArg (\x o ->
+ o { idleIconPattern = Just $ parseIconPattern 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 Status = Charging | Discharging | Full | Idle | Unknown deriving (Read, Eq)
+
+data Result = Result Float Float Float Status | NA
+
+sysDir :: FilePath
+sysDir = "/sys/class/power_supply"
+
+battConfig :: IO MConfig
+battConfig = mkMConfig
+ "Batt: <watts>, <left>% / <timeleft>" -- template
+ ["leftbar", "leftvbar", "left", "acstatus", "timeleft", "watts", "leftipat"] -- replacements
+
+data Files = Files
+ { fFull :: String
+ , fNow :: String
+ , fVoltage :: String
+ , fCurrent :: String
+ , fStatus :: String
+ , isCurrent :: Bool
+ } | NoFiles deriving Eq
+
+data Battery = Battery
+ { full :: !Float
+ , now :: !Float
+ , power :: !Float
+ , status :: !String
+ }
+
+safeFileExist :: String -> String -> IO Bool
+safeFileExist d f = handle noErrors $ fileExist (d </> f)
+ where noErrors = const (return False) :: SomeException -> IO Bool
+
+batteryFiles :: String -> IO Files
+batteryFiles bat =
+ do is_charge <- exists "charge_now"
+ is_energy <- if is_charge then return False else exists "energy_now"
+ is_power <- exists "power_now"
+ plain <- exists (if is_charge then "charge_full" else "energy_full")
+ let cf = if is_power then "power_now" else "current_now"
+ sf = if plain then "" else "_design"
+ return $ case (is_charge, is_energy) of
+ (True, _) -> files "charge" cf sf is_power
+ (_, True) -> files "energy" cf sf is_power
+ _ -> NoFiles
+ where prefix = sysDir </> bat
+ exists = safeFileExist prefix
+ files ch cf sf ip = Files { fFull = prefix </> ch ++ "_full" ++ sf
+ , fNow = prefix </> ch ++ "_now"
+ , fCurrent = prefix </> cf
+ , fVoltage = prefix </> "voltage_now"
+ , fStatus = prefix </> "status"
+ , isCurrent = not ip}
+
+haveAc :: FilePath -> IO Bool
+haveAc f =
+ handle onError $ withFile (sysDir </> f) ReadMode (fmap (== "1") . hGetLine)
+ where onError = const (return False) :: SomeException -> IO Bool
+
+readBattery :: Float -> Files -> IO Battery
+readBattery _ NoFiles = return $ Battery 0 0 0 "Unknown"
+readBattery sc files =
+ do a <- grab $ fFull files
+ b <- grab $ fNow files
+ d <- grab $ fCurrent files
+ s <- grabs $ fStatus files
+ let sc' = if isCurrent files then sc / 10 else sc
+ a' = max a b -- sometimes the reported max charge is lower than
+ return $ Battery (3600 * a' / sc') -- wattseconds
+ (3600 * b / sc') -- wattseconds
+ (d / sc') -- watts
+ s -- string: Discharging/Charging/Full
+ where grab f = handle onError $ withFile f ReadMode (fmap read . hGetLine)
+ onError = const (return (-1)) :: SomeException -> IO Float
+ grabs f = handle onError' $ withFile f ReadMode hGetLine
+ onError' = const (return "Unknown") :: SomeException -> IO String
+
+-- sortOn is only available starting at ghc 7.10
+sortOn :: Ord b => (a -> b) -> [a] -> [a]
+sortOn f =
+ map snd . sortBy (comparing fst) . map (\x -> let y = f x in y `seq` (y, x))
+
+mostCommonDef :: Eq a => a -> [a] -> a
+mostCommonDef x xs = head $ last $ [x] : sortOn length (group xs)
+
+readBatteries :: BattOpts -> [Files] -> IO Result
+readBatteries opts bfs =
+ do let bfs' = filter (/= NoFiles) bfs
+ bats <- mapM (readBattery (scale opts)) (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 power bats)
+ time = if watts == 0 then 0 else max 0 (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
+ statuses :: [Status]
+ statuses = map (fromMaybe Unknown . readMaybe)
+ (sort (map status bats))
+ acst = mostCommonDef Unknown $ filter (Unknown/=) statuses
+ racst | acst /= Unknown = acst
+ | time == 0 = Idle
+ | ac = Charging
+ | otherwise = Discharging
+ return $ if isNaN left then NA else Result left watts time racst
+
+runBatt :: [String] -> Monitor String
+runBatt = runBatt' ["BAT", "BAT0", "BAT1", "BAT2"]
+
+runBatt' :: [String] -> [String] -> Monitor String
+runBatt' bfs args = do
+ opts <- io $ parseOpts args
+ c <- io $ readBatteries opts =<< mapM batteryFiles bfs
+ suffix <- getConfigValue useSuffix
+ d <- getConfigValue decDigits
+ nas <- getConfigValue naString
+ case c of
+ Result x w t s ->
+ do l <- fmtPercent x
+ ws <- fmtWatts w opts suffix d
+ si <- getIconPattern opts s x
+ parseTemplate (l ++ [fmtStatus opts s nas, fmtTime $ floor t, ws, si])
+ NA -> getConfigValue naString
+ where fmtPercent :: Float -> Monitor [String]
+ fmtPercent x = do
+ let x' = minimum [1, x]
+ p <- showPercentWithColors x'
+ b <- showPercentBar (100 * x') x'
+ vb <- showVerticalBar (100 * x') x'
+ return [b, vb, p]
+ fmtWatts x o s d = do
+ ws <- showWithPadding $ showDigits d x ++ (if s then "W" else "")
+ return $ color x o ws
+ 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)
+ fmtStatus opts Idle _ = idleString opts
+ fmtStatus _ Unknown na = na
+ fmtStatus opts Full _ = idleString opts
+ fmtStatus opts Charging _ = onString opts
+ fmtStatus opts Discharging _ = offString opts
+ maybeColor Nothing str = str
+ 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)
+ getIconPattern opts st x = do
+ let x' = minimum [1, x]
+ case st of
+ Unknown -> showIconPattern (offIconPattern opts) x'
+ Idle -> showIconPattern (idleIconPattern opts) x'
+ Full -> showIconPattern (idleIconPattern opts) x'
+ Charging -> showIconPattern (onIconPattern opts) x'
+ Discharging -> showIconPattern (offIconPattern opts) x'
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