Re: [xmonad] Suspend Keybinding Temporarily

29 Nov 2018


      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  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 mailto:sgf.dma@gmail.com> wrote:
On November 28, 2018 9:25:00 PM GMT+03:00, Brandon Allbery
    mailto:allbery.b@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
    mailto:sgf.dma@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@gmail.com mailto:allbery.b@gmail.com
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