summaryrefslogtreecommitdiffhomepage
path: root/src/Plugins/Monitors/Volume.hs
blob: 2787a3cfcc779737bb708f2a5a99a34c8b416ce8 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
-----------------------------------------------------------------------------
-- |
-- Module      :  Plugins.Monitors.Volume
-- Copyright   :  (c) 2011, 2013 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.Applicative ((<$>))
import Control.Monad ( join, liftM2, liftM3, mplus )
import Data.Traversable (sequenceA)
import Plugins.Monitors.Common
import Sound.ALSA.Mixer
import qualified Sound.ALSA.Exception as AE
import System.Console.GetOpt

volumeConfig :: IO MConfig
volumeConfig = mkMConfig "Vol: <volume>% <status>"
                         ["volume", "volumebar", "volumevbar", "dB","status", "volumedstr"]


data VolumeOpts = VolumeOpts
    { onString :: String
    , offString :: String
    , onColor :: Maybe String
    , offColor :: Maybe String
    , highDbThresh :: Float
    , lowDbThresh :: Float
    , volumeDynamicString :: Maybe DynamicString
    }

defaultOpts :: VolumeOpts
defaultOpts = VolumeOpts
    { onString = "[on] "
    , offString = "[off]"
    , onColor = Just "green"
    , offColor = Just "red"
    , highDbThresh = -5.0
    , lowDbThresh = -30.0
    , volumeDynamicString = Nothing
    }

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 }) "") ""
    , Option "" ["volume-dynamic-string"] (ReqArg (\x o ->
       o { volumeDynamicString = Just $ parseDynamicString 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'

formatVol :: Integer -> Integer -> Integer -> Monitor String
formatVol lo hi v =
    showPercentWithColors $ percent v lo hi

formatVolBar :: Integer -> Integer -> Integer -> Monitor String
formatVolBar lo hi v =
    showPercentBar (100 * x) x where x = percent v lo hi

formatVolVBar :: Integer -> Integer -> Integer -> Monitor String
formatVolVBar lo hi v =
    showVerticalBar (100 * x) x where x = percent v lo hi

formatVolDStr :: Maybe DynamicString -> Integer -> Integer -> Integer -> Monitor String
formatVolDStr dstr lo hi v =
    showDynamicString dstr $ 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 -> Integer -> Monitor String
formatDb opts dbi = do
    h <- getConfigValue highColor
    m <- getConfigValue normalColor
    l <- getConfigValue lowColor
    d <- getConfigValue decDigits
    let db = fromIntegral dbi / 100.0
        digits = showDigits d 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
    (lo, hi, val, db, sw) <- io $ withMixer mixerName $ \mixer -> do
        control <- getControlByName mixer controlName
        (lo, hi) <- liftMaybe $ getRange <$> volumeControl control
        val <- getVal $ volumeControl control
        db <- getDB $ volumeControl control
        sw <- getSw $ switchControl control
        return (lo, hi, val, db, sw)
    p <- liftMonitor $ liftM3 formatVol lo hi val
    b <- liftMonitor $ liftM3 formatVolBar lo hi val
    v <- liftMonitor $ liftM3 formatVolVBar lo hi val
    d <- getFormatDB opts db
    s <- getFormatSwitch opts sw
    dstr <- liftMonitor $ liftM3 (formatVolDStr $ volumeDynamicString opts) lo hi val
    parseTemplate [p, b, v, d, s, dstr]

  where

    volumeControl :: Maybe Control -> Maybe Volume
    volumeControl c = join $
           (playback . volume <$> c) `mplus` (common . volume <$> c)

    switchControl :: Maybe Control -> Maybe Switch
    switchControl c = join $
           (playback . switch <$> c) `mplus` (common . switch <$> c)

    liftMaybe :: Maybe (IO (a,b)) -> IO (Maybe a, Maybe b)
    liftMaybe = fmap (liftM2 (,) (fmap fst) (fmap snd)) . sequenceA

    liftMonitor :: Maybe (Monitor String) -> Monitor String
    liftMonitor Nothing = unavailable
    liftMonitor (Just m) = m

    getDB :: Maybe Volume -> IO (Maybe Integer)
    getDB Nothing = return Nothing
    getDB (Just v) = AE.catch (getChannel FrontLeft $ dB v)
                              (const $ return $ Just 0)

    getVal :: Maybe Volume -> IO (Maybe Integer)
    getVal Nothing = return Nothing
    getVal (Just v) = getChannel FrontLeft $ value v

    getSw :: Maybe Switch -> IO (Maybe Bool)
    getSw Nothing = return Nothing
    getSw (Just s) = getChannel FrontLeft s

    getFormatDB :: VolumeOpts -> Maybe Integer -> Monitor String
    getFormatDB _ Nothing = unavailable
    getFormatDB opts (Just d) = formatDb opts d

    getFormatSwitch :: VolumeOpts -> Maybe Bool -> Monitor String
    getFormatSwitch _ Nothing = unavailable
    getFormatSwitch opts (Just sw) = formatSwitch opts sw

    unavailable = getConfigValue naString