Fix fromJust exception in Volume plugin #90

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dmalikov commented Feb 3, 2013

Suppose there is no PCM alsa device.

Xmobar failed with error: Maybe.fromJust: Nothing exception running with following config:

Config { persistent = True
       , lowerOnStart = False
       , hideOnStart = False
       , font = "-*-terminus-medium-r-normal--12-*"
       , border = NoBorder
       , borderColor = "#1c1c1c"
       , bgColor = "#1c1c1c"
       , fgColor = "#8080A1"
       , position = Static { xpos = 120
                           , ypos = 1060
                           , width = 1800
                           , height = 20
                           }
       , commands = [ Run Volume "default" "PCM" [] 5, Run StdinReader ]
       , sepChar = "%"
       , alignSep = "}{"
       , template = " %StdinReader% }{ %default:PCM% "
       }
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jaor Feb 3, 2013

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I'm getting this compilation error in ghc 7.4.1:

src/Plugins/Monitors/Volume.hs:141:27:
    Ambiguous occurrence `catch'
    It could refer to either `Prelude.catch',
                             imported from `Prelude' at src/Plugins/Monitors/Volume.hs:15:8-30
                             (and originally defined in `System.IO.Error')
                          or `Sound.ALSA.Exception.catch',
                             imported from `Sound.ALSA.Exception' at src/Plugins/Monitors/Volume.hs:22:31-35
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jaor commented Feb 3, 2013

I'm getting this compilation error in ghc 7.4.1:

src/Plugins/Monitors/Volume.hs:141:27:
    Ambiguous occurrence `catch'
    It could refer to either `Prelude.catch',
                             imported from `Prelude' at src/Plugins/Monitors/Volume.hs:15:8-30
                             (and originally defined in `System.IO.Error')
                          or `Sound.ALSA.Exception.catch',
                             imported from `Sound.ALSA.Exception' at src/Plugins/Monitors/Volume.hs:22:31-35
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jaor Feb 3, 2013

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pressed 'send' too soon, sorry... i can solve the problem with import Prelude hiding (catch): does that work also in ghc 7.6?

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jaor commented Feb 3, 2013

pressed 'send' too soon, sorry... i can solve the problem with import Prelude hiding (catch): does that work also in ghc 7.6?

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jaor Feb 3, 2013

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@dmalikov, while we're at it, we might also take a look at http://code.google.com/p/xmobar/issues/detail?id=79, if you feel like it... (but i can do that if you don't, no problem)

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jaor commented Feb 3, 2013

@dmalikov, while we're at it, we might also take a look at http://code.google.com/p/xmobar/issues/detail?id=79, if you feel like it... (but i can do that if you don't, no problem)

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dmalikov Feb 3, 2013

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Yep, in ghc-7.6 there is a warning

src/Plugins/Monitors/Volume.hs:17:1: Warning:
    Module `Prelude' does not export `catch'

So I returned it back.

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dmalikov commented Feb 3, 2013

Yep, in ghc-7.6 there is a warning

src/Plugins/Monitors/Volume.hs:17:1: Warning:
    Module `Prelude' does not export `catch'

So I returned it back.

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dmalikov Feb 3, 2013

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I can't reproduce different values in xmobar and alsamixer. They are the same :[

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dmalikov commented Feb 3, 2013

I can't reproduce different values in xmobar and alsamixer. They are the same :[

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jaor Feb 4, 2013

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I can't reproduce different values in xmobar and alsamixer. They are
the same :[

That's interesting... never mind, then, i'll try to find out what's
going on here (i do get different values).

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jaor commented Feb 4, 2013

I can't reproduce different values in xmobar and alsamixer. They are
the same :[

That's interesting... never mind, then, i'll try to find out what's
going on here (i do get different values).

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jaor Feb 4, 2013

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OK, i've pushed your patch and solved the catch problem just by
importing ALSA.Exception as a qualified module (i've also removed a
couple remaining uses of the hiding (catch) clause elsewhere).

Please, let me know whether it compiles (and works) fine 7.6 if you can
try!

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jaor commented Feb 4, 2013

OK, i've pushed your patch and solved the catch problem just by
importing ALSA.Exception as a qualified module (i've also removed a
couple remaining uses of the hiding (catch) clause elsewhere).

Please, let me know whether it compiles (and works) fine 7.6 if you can
try!

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dmalikov Feb 4, 2013

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Compiles and works fine on 7.6

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dmalikov commented Feb 4, 2013

Compiles and works fine on 7.6

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