Added volume monitor based on alsa-mixer.

1 files changed, 36 insertions, 0 deletions

diff --git a/src/Plugins/Monitors/Volume.hs b/src/Plugins/Monitors/Volume.hs
new file mode 100644
index 0000000..c7814a8
--- /dev/null
+++ b/src/Plugins/Monitors/Volume.hs
@@ -0,0 +1,36 @@
+module Plugins.Monitors.Volume (runVolume, volumeConfig) where
+
+import Control.Monad ( liftM )
+import Data.Maybe
+import Plugins.Monitors.Common
+import Sound.ALSA.Mixer
+
+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>% <fc=green><on></fc><fc=red><off></fc>"
+                         ["volume","dB","on","off"]
+
+runVolume :: String -> String -> [String] -> Monitor String
+runVolume mixerName controlName _ = do
+    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 <- liftM fromJust $ io $ getChannel FrontLeft $ value volumeControl
+    db <- liftM fromJust $ io $ getChannel FrontLeft $ dB volumeControl
+    sw <- liftM fromJust $ io $ getChannel FrontLeft $ switchControl
+    p <- showPercentsWithColors [ percent val lo hi ]
+    let d :: Double
+        d = fromIntegral db / 100.0
+        dStr = showDigits 2 d
+    parseTemplate $ p ++ [ dStr ]
+                      ++ [ if sw then "[on] " else ""
+                         , if sw then "" else "[off]"
+                         ]