[xmonad] DynamicWorkspaceGroups persistent after reboot?

[Brent Yorgey]

On Tue, Apr 08, 2014 at 04:48:12PM +0200, Alexis de BRUYN wrote:
> On 07.04.2014 19:00, Brent Yorgey wrote:
> > On Sat, Mar 29, 2014 at 02:36:31PM +0100, Alexis de BRUYN wrote:
> >> Hi Everybody,
> >>
> >> Is there a way make the WSGroup persistent after reboot with
> >> XMonad.Actions.DynamicWorkspaceGroups?
> >>
> >> Can we define statically the WSGroup? With addWSGroup?
> > 
> > Hi Alexis,
> Hi Brent,
> 
> > Apologies for the delay in responding.  Yes, to statically define some
> No problem.
> 
> > WSGroups it should suffice to put some calls to addWSGroup in your
> > startupHook.  Let me know if you have any trouble.
> Actually I can set my Groups with addWSGroup in my startupHook, but only
> a group is created if the workspaces are displayed on screens.
> 
> eg :
> myWorkspaces = ["1", "2", "3", "4", "5", "6"]
> 
> myStartupHook = do
>                 addWSGroup "g1" ["1", "2", "3"]
>                 addWSGroup "g2" ["4", "5", "6"]
> 
> After restarting xmonad, only g1 is created (and "1", "2" & "3" are
> displayed as usual).

Oh, sorry, I see what is wrong.  DynamicWorkspaceGroups remembers not
just the names of the workspaces but which screens they were on (so
that the same workspaces will always be displayed on the same screens
when you switch to a workspace group).  So addWSGroup only looks among
the currently displayed workspaces, because otherwise it does not know
which screen id to use for each workspace.

The following function should achieve what you want:

  import qualified Data.Map                    as M
  import qualified XMonad.Util.ExtensibleState as XS

  addWSGroup' :: WSGroupId -> [(ScreenId, WorkspaceId)] -> X ()
  addWSGroup' name = XS.modify . withWSG . M.insert name

Now you have to explicitly give it screen ID's, of course, like

  myStartupHook = do
    addWSGroup' "g1" [(S 0, "1"), (S 1, "2"), (S 2, "3")]
    ... etc.

Unfortunately I do not remember whether there is any guarantee about
the numbering of screens being consecutive or even being the same
between different runs of xmonad.  You will have to experiment a bit.

-Brent