Merge branch 'ttuegel-master'

1 files changed, 122 insertions, 0 deletions

diff --git a/src/Plugins/Monitors/Volume.hs b/src/Plugins/Monitors/Volume.hs
new file mode 100644
index 0000000..72a9b0e
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+++ b/src/Plugins/Monitors/Volume.hs
@@ -0,0 +1,122 @@
+-----------------------------------------------------------------------------
+-- |
+-- Module      :  Plugins.Monitors.Volume
+-- Copyright   :  (c) 2011 Thomas Tuegel
+-- License     :  BSD-style (see LICENSE)
+--
+-- Maintainer  :  Jose A. Ortega Ruiz <jao@gnu.org>
+-- Stability   :  unstable
+-- Portability :  unportable
+--
+-- A monitor for ALSA soundcards
+--
+-----------------------------------------------------------------------------
+
+module Plugins.Monitors.Volume (runVolume, volumeConfig) where
+
+import Control.Monad ( liftM )
+import Data.Maybe
+import Plugins.Monitors.Common
+import Sound.ALSA.Mixer
+import System.Console.GetOpt
+
+data VolumeOpts = VolumeOpts
+    { onString :: String
+    , offString :: String
+    , onColor :: Maybe String
+    , offColor :: Maybe String
+    , highDbThresh :: Float
+    , lowDbThresh :: Float
+    }
+
+defaultOpts :: VolumeOpts
+defaultOpts = VolumeOpts
+    { onString = "[on] "
+    , offString = "[off]"
+    , onColor = Just "green"
+    , offColor = Just "red"
+    , highDbThresh = -5.0
+    , lowDbThresh = -30.0
+    }
+
+options :: [OptDescr (VolumeOpts -> VolumeOpts)]
+options =
+    [ Option "O" ["on"] (ReqArg (\x o -> o { onString = x }) "") ""
+    , Option "o" ["off"] (ReqArg (\x o -> o { offString = x }) "") ""
+    , Option "" ["lowd"] (ReqArg (\x o -> o { lowDbThresh = read x }) "") ""
+    , Option "" ["highd"] (ReqArg (\x o -> o { highDbThresh = read x }) "") ""
+    , Option "C" ["onc"] (ReqArg (\x o -> o { onColor = Just x }) "") ""
+    , Option "c" ["offc"] (ReqArg (\x o -> o { offColor = Just x }) "") ""
+    ]
+
+parseOpts :: [String] -> IO VolumeOpts
+parseOpts argv =
+    case getOpt Permute options argv of
+        (o, _, []) -> return $ foldr id defaultOpts o
+        (_, _, errs) -> ioError . userError $ concat errs
+
+percent :: Integer -> Integer -> Integer -> Float
+percent v' lo' hi' = (v - lo) / (hi - lo)
+  where v = fromIntegral v'
+        lo = fromIntegral lo'
+        hi = fromIntegral hi'
+
+volumeConfig :: IO MConfig
+volumeConfig = mkMConfig "Vol: <volume>% <status>"
+                         ["volume","dB","status"]
+
+formatVol :: Integer -> Integer -> Integer -> Monitor String
+formatVol v lo hi =
+    showPercentWithColors $ percent v lo hi
+
+switchHelper :: VolumeOpts
+             -> (VolumeOpts -> Maybe String)
+             -> (VolumeOpts -> String)
+             -> Monitor String
+switchHelper opts cHelp strHelp = return $
+    colorHelper (cHelp opts)
+    ++ strHelp opts
+    ++ maybe "" (const "</fc>") (cHelp opts)
+
+formatSwitch :: VolumeOpts -> Bool -> Monitor String
+formatSwitch opts True = switchHelper opts onColor onString
+formatSwitch opts False = switchHelper opts offColor offString
+
+colorHelper :: Maybe String -> String
+colorHelper = maybe "" (\c -> "<fc=" ++ c ++ ">")
+
+formatDb :: VolumeOpts -> Float -> Monitor String
+formatDb opts db = do
+    h <- getConfigValue highColor
+    m <- getConfigValue normalColor
+    l <- getConfigValue lowColor
+    let digits = showDigits 0 db
+        startColor | db >= highDbThresh opts = colorHelper h
+                   | db < lowDbThresh opts = colorHelper l
+                   | otherwise = colorHelper m
+        stopColor | null startColor = ""
+                  | otherwise = "</fc>"
+    return $ startColor ++ digits ++ stopColor
+
+runVolume :: String -> String -> [String] -> Monitor String
+runVolume mixerName controlName argv = do
+    opts <- io $ parseOpts argv
+    control <- liftM fromJust $ io $ getControlByName mixerName controlName
+    let volumeControl = fromJust $ maybe (playback $ volume control) Just
+                                         (common $ volume control)
+        switchControl = fromJust $ maybe (playback $ switch control) Just
+                                         (common $ switch control)
+    (lo, hi) <- io $ getRange volumeControl
+    val <- io $ getChannel FrontLeft $ value volumeControl
+    db <- io $ getChannel FrontLeft $ dB volumeControl
+    sw <- io $ getChannel FrontLeft switchControl
+    p <- case val of
+             Just x -> formatVol x lo hi
+             Nothing -> formatVol hi lo hi
+    d <- case db of
+             Just x -> formatDb opts $ fromIntegral x / 100.0
+             Nothing -> formatDb opts 0.0
+    s <- case sw of
+             Just x -> formatSwitch opts x
+             Nothing -> formatSwitch opts True
+    parseTemplate [ p, d, s ]