Back to app/src, since it seems they're the default convention for stack

1 files changed, 247 insertions, 0 deletions

diff --git a/src/Xmobar/Plugins/Monitors/Batt.hs b/src/Xmobar/Plugins/Monitors/Batt.hs
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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'