[xmonad] Suspend Keybinding Temporarily

[Brandon Allbery]

Yes. More specifically, it's ultimately using the execve() syscall, via one
of the wrappers which propagates the environment (which one depends on
whether it's asked to do $PATH search or not).

On Thu, Nov 29, 2018 at 4:07 PM Dmitriy Matrosov <sgf.dma at gmail.com> wrote:

> 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>
>
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-- 
brandon s allbery kf8nh
allbery.b at gmail.com
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