[xmonad] Suspend Keybinding Temporarily

[Dmitriy Matrosov]

On 11/29/2018 09:50 PM, Brandon Allbery wrote:
> 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.

You mean, `executeFile` preserves environment? So, i may change it from 
running xmonad (by e.g. keybinding) and then restart it?

> On Thu, Nov 29, 2018 at 6:01 AM Dmitriy Matrosov <sgf.dma at gmail.com 
> <mailto:sgf.dma at gmail.com>> wrote:
> 
> 
> 
>     On November 28, 2018 9:25:00 PM GMT+03:00, Brandon Allbery
>     <allbery.b at gmail.com <mailto: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 <mailto: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 <mailto:allbery.b at gmail.com>