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+-----------------------------------------------------------------------------
+---- |
+---- Module : Plugins.Monitors.Birght
+---- Copyright : (c) Martin Perner
+---- License : BSD-style (see LICENSE)
+----
+---- Maintainer : Martin Perner <martin@perner.cc>
+---- Stability : unstable
+---- Portability : unportable
+----
+---- A screen brightness monitor for Xmobar
+----
+-------------------------------------------------------------------------------
+
+module Xmobar.Plugins.Monitors.Bright (brightConfig, runBright) where
+
+import Control.Applicative ((<$>))
+import Control.Exception (SomeException, handle)
+import qualified Data.ByteString.Lazy.Char8 as B
+import System.FilePath ((</>))
+import System.Posix.Files (fileExist)
+import System.Console.GetOpt
+
+import Xmobar.Plugins.Monitors.Common
+
+data BrightOpts = BrightOpts { subDir :: String
+ , currBright :: String
+ , maxBright :: String
+ , curBrightIconPattern :: Maybe IconPattern
+ }
+
+defaultOpts :: BrightOpts
+defaultOpts = BrightOpts { subDir = "acpi_video0"
+ , currBright = "actual_brightness"
+ , maxBright = "max_brightness"
+ , curBrightIconPattern = Nothing
+ }
+
+options :: [OptDescr (BrightOpts -> BrightOpts)]
+options = [ Option "D" ["device"] (ReqArg (\x o -> o { subDir = x }) "") ""
+ , Option "C" ["curr"] (ReqArg (\x o -> o { currBright = x }) "") ""
+ , Option "M" ["max"] (ReqArg (\x o -> o { maxBright = x }) "") ""
+ , Option "" ["brightness-icon-pattern"] (ReqArg (\x o ->
+ o { curBrightIconPattern = Just $ parseIconPattern x }) "") ""
+ ]
+
+-- from Batt.hs
+parseOpts :: [String] -> IO BrightOpts
+parseOpts argv =
+ case getOpt Permute options argv of
+ (o, _, []) -> return $ foldr id defaultOpts o
+ (_, _, errs) -> ioError . userError $ concat errs
+
+sysDir :: FilePath
+sysDir = "/sys/class/backlight/"
+
+brightConfig :: IO MConfig
+brightConfig = mkMConfig "<percent>" -- template
+ ["vbar", "percent", "bar", "ipat"] -- replacements
+
+data Files = Files { fCurr :: String
+ , fMax :: String
+ }
+ | NoFiles
+
+brightFiles :: BrightOpts -> IO Files
+brightFiles opts = do
+ is_curr <- fileExist $ fCurr files
+ is_max <- fileExist $ fCurr files
+ return (if is_curr && is_max then files else NoFiles)
+ where prefix = sysDir </> subDir opts
+ files = Files { fCurr = prefix </> currBright opts
+ , fMax = prefix </> maxBright opts
+ }
+
+runBright :: [String] -> Monitor String
+runBright args = do
+ opts <- io $ parseOpts args
+ f <- io $ brightFiles opts
+ c <- io $ readBright f
+ case f of
+ NoFiles -> return "hurz"
+ _ -> fmtPercent opts c >>= parseTemplate
+ where fmtPercent :: BrightOpts -> Float -> Monitor [String]
+ fmtPercent opts c = do r <- showVerticalBar (100 * c) c
+ s <- showPercentWithColors c
+ t <- showPercentBar (100 * c) c
+ d <- showIconPattern (curBrightIconPattern opts) c
+ return [r,s,t,d]
+
+readBright :: Files -> IO Float
+readBright NoFiles = return 0
+readBright files = do
+ currVal<- grab $ fCurr files
+ maxVal <- grab $ fMax files
+ return (currVal / maxVal)
+ where grab f = handle handler (read . B.unpack <$> B.readFile f)
+ handler = const (return 0) :: SomeException -> IO Float
+