[xmonad] Suspend Keybinding Temporarily

[Brandon Allbery]

You were talking about restart, between the running xmonad and its
replacement via executeFile. There, you can use the environment. There is
no way to pass information between an invoked "xmonad --restart" and the
running xmonad.

On Thu, Nov 29, 2018 at 6:01 AM Dmitriy Matrosov <sgf.dma at gmail.com> wrote:

>
>
> On November 28, 2018 9:25:00 PM GMT+03:00, Brandon Allbery <
> allbery.b at gmail.com> wrote:
> >Not by default; there's already a bug (
> >https://github.com/xmonad/xmonad/issues/78) about our not obeying the
> >ICCCM
> >replace protocol unless started by replacing some other WM.
> >
> >There's a few other places you can hide extra parameters; starting that
> >early, the environment is probably the easiest to use, provided they're
> >not
> >too large (see why there's a state file now).
>
> Hm, i don't understand how to use environment. I need to pass something to
> running xmonad process (to which i send XMONAD_RESTART). As far as i know,
> i can't change environment of another process..
>
>
> >On Wed, Nov 28, 2018 at 1:20 PM Dmitriy Matrosov <sgf.dma at gmail.com>
> >wrote:
> >
> >> Hi.
> >>
> >> On 11/21/2018 09:49 PM, Eyal Erez wrote:
> >> > Hi,
> >> >
> >> > I'm getting some collisions between my xmonad keybindings and an
> >> > application I'm running (it's a game that is suppose to run full
> >screen
> >> > but in reality just uses a large window).  I was wondering if I
> >could
> >> > suspend or change some keybindings from a script that I can run
> >before
> >> > the app launches and then restore later.
> >> >
> >> > Is this at all possible?  Happy to entertain other options.
> >>
> >> Here is proof of concept:
> >>
> >>
> >>          import XMonad
> >>          import XMonad.Hooks.EwmhDesktops
> >>
> >>          import System.Directory
> >>          import System.FilePath
> >>
> >>
> >>          main :: IO ()
> >>          main = do
> >>                  let xcf = ewmh $ def
> >>                              { modMask = mod4Mask
> >>                              , handleExtraArgs = disableKeys
> >>                              }
> >>                  xmonad xcf
> >>
> >>          disableKeys :: [String] -> XConfig Layout -> IO (XConfig
> >Layout)
> >>          disableKeys _ xcf = do
> >>              xd <- getXMonadDir
> >>              let disableFn = xd </> "disable_keys"
> >>              b <- doesFileExist disableFn
> >>              if b
> >>                then do
> >>                  trace "Disabling all keys."
> >>                  removeFile disableFn
> >>                  return (xcf {keys = \_ -> mempty})
> >>                else return xcf
> >>
> >>
> >> To disable all keys create file `~/.xmonad/disable_keys` and then
> >> restart xmonad with `xmonad --restart`. All keys will be disabled
> >> _and_ file deleted (to avoid locking yourself), thus next restart
> >will
> >> restore all keys back.
> >>
> >> As far as i understand, xmonad grabs keys in `X.Main.launch` before
> >> entering main loop. Thus, the one way to change key grab is to
> >restart
> >> xmonad. I need to modify `XConfig` before calling X.Main.launch`, and
> >> this may be done by `handleExtraArgs` (called in `launch'` in
> >> `X.Main.xmonad`). Unfortunately, it seems, that xmonad does not allow
> >> to pass extra cmd arguments during restart (`X.Operations.restart`
> >> always starts xmonad with name `xmonad` and no arguments). Also, i
> >> can't use extensible state in `handleExtraArgs`, because it runs in
> >> `IO` (`X` context is not yet built at that time).  Thus, to pass
> >> something to it, i may use either file or (probably) `--replace`. The
> >> above version uses file. And i have no luck with `--replace`: it
> >> seems, `xmonad` can't replace itself?..
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> >>
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-- 
brandon s allbery kf8nh
allbery.b at gmail.com
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