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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.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 }) "") ""
]
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 $ parseOptsWith options defaultOpts 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
|
