[xmonad] list of visible workspaces

Bryan Huh bhh1988 at gmail.com
Thu Aug 2 20:42:11 CEST 2012

I see. That solved that problem, but now I get an error saying:

     Couldn't match expected type `W.Workspace i l a'
            against inferred type `W.Screen
                                     WorkspaceId (Layout Window) Window 
ScreenId ScreenDetail'
     In the first argument of `(:)', namely `W.current ws'
     In the second argument of `($)', namely
         `W.current ws : W.visible ws'
     In the second argument of `notElem', namely
         `(map W.tag $ W.current ws : W.visible ws)'

and also in the line where I use viewHidden:

     Couldn't match expected type `X ()'
            against inferred type `W.StackSet WorkspaceId l a s sd
                                   -> W.StackSet WorkspaceId l a s sd'
       Expected type: (WorkspaceId -> X (), t)
       Inferred type: (WorkspaceId
                       -> W.StackSet WorkspaceId l a s sd
                       -> W.StackSet WorkspaceId l a s sd,
     In the expression: (W.shift, shiftMask)
     In the expression: [(viewHidden, 0), (W.shift, shiftMask)]

I think the second error is probably because of the first, which seems 
to be a type mismatch. Is there a quick fix for this?

Thanks for your help,

On 08/02/2012 11:32 AM, Brandon Allbery wrote:
> On Thu, Aug 2, 2012 at 2:20 PM, Bryan Huh <bhh1988 at gmail.com 
> <mailto:bhh1988 at gmail.com>> wrote:
>     I'm sorry if this is a stupid question, but the xmonad.hs doesn't
>     compile saying that "when" is out of scope. It seems to not
>     recognize the keyword "when." I tried "if" as well but then it
>     tells me there's a parse error. Are you sure that what you have
>     compiles for you?
> "when" isn't a keyword; it's a function defined in Control.Monad. 
>  (Haskell's laziness means that many things that would have to be 
> baked-in syntax in other languages can be written as functions, and 
> its syntax means those functions behave as if they *were* baked into 
> the language.)  So all you should need to do is add
>     import Control.Monad (when)
> up with the other import statements.
> -- 
> brandon s allbery allbery.b at gmail.com <mailto:allbery.b at gmail.com>
> wandering unix systems administrator (available)     (412) 475-9364 vm/sms

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