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-- TODO: remove `killall xmobar` once xmobar will use stdin reader.
import XMonad
import XMonad.Hooks.DynamicLog
import XMonad.Hooks.ManageDocks
import XMonad.Hooks.EwmhDesktops
import XMonad.Actions.Submap
import XMonad.Config
import qualified Data.Map as M
import XMonad.Util.SpawnOnce
import XMonad.Util.EZConfig
-- | Prefixes everything with mod+t instead of a mod key, so that
-- mod+1 becomes mod+t 1 (e.g., C-1 -> C-t 1), for instance.
myKeys :: (XConfig Layout -> M.Map (KeyMask, KeySym) (X ()))
-> XConfig Layout
-> M.Map (KeyMask, KeySym) (X ())
myKeys oldKeys conf@(XConfig {XMonad.modMask = modMask}) =
M.fromList [((modMask, xK_t), submap (oldKeys conf { modMask = noModMask }))]
{- | On CentOS 7, with GeForce GTX 660 and a proprietary NVIDIA driver,
with vsync enabled in nvidia-settings:
- default: white flash when switching to FF, and screen tearing on
smooth scrolling there
- compton --backend glx: screen tearing in emacs on scroll/text
movement, apparently happens just after some time (may be a bug)
- compton --backend glx --vsync opengl-swc: same
- compton --backend glx --paint-on-overlay: same
- compton --backend glx --vsync opengl --paint-on-overlay: same
- compton --backend glx --vsync opengl-swc --sw-opti: same, probably
FF scrolling gets less smooth
- compton with
<https://bbs.archlinux.org/viewtopic.php?pid=1541023#p1541023>
configuration: same, probably FF scrolling got worse
- compton with that and `glx-swap-method = "buffer-age"`, as suggested
further in that thread: some text bits in emacs begin changing back
and forth even without scrolling (apparently that's what is
described even further there).
- compton --backend xrender: same as with no compton
- compton --dbe: same
- compton --backend xrender --vsync opengl-oml: same
- compton --backend xrender --vsync opengl: same, but reduces the
flashing
- compton --backend xrender --vsync opengl --paint-on-overlay: same
- compton --backend xrender --vsync opengl --dbe: same
- compton --backend xrender -cf: eliminates the white flash, though a
bit slower; same as without -cf otherwise
- with --vsync drm: "VBlank ioctl did not work, unimplemented in this
drmver?"
Apparently these and similar issues are not uncommon (and not specific
to xmonad), and there's a bunch of different solutions -- some of them
probably working for some users, but they tend to have side effects as
well. Pretty much as described on
<https://github.com/chjj/compton/wiki/vsync-guide>.
Using 'spawnOnce' here, so that it wouldn't run multiple compton
processes on xmonad restart: that would load CPU and make the display
unusable. A drawback is that restarting xmonad doesn't suffice to
restart a killed compton. This actually shouldn't be an issue, since
compton is supposed to handle it:
- https://specifications.freedesktop.org/wm-spec/latest/ar01s08.html#idm139870829889072
- https://github.com/chjj/compton/issues/301
But I've got an old version from repositories (apparently they don't
do much of versioning or releases, or of other conventional things,
but the package update date is 2014-10-16). I still don't see why this
happens (would probably have to debug, or at least to try a newer
version), but it does.
-}
runCompton = spawnOnce "compton --backend xrender -cf"
main = do
-- This is awkward, but apparently there's no better standard way to
-- avoid multiple xmobar instances.
c <- statusBar "killall --quiet --exact xmobar; xmobar" xmobarPP
(\(XConfig {XMonad.modMask = modMask}) -> (modMask, xK_b))
def
-- EWMH (extended window manager hints) are used to control xmonad
-- with xdotool from xmobar.
xmonad $ ewmh c
{ layoutHook = avoidStruts $ layoutHook c
, manageHook = manageHook c <+> manageDocks
, keys = myKeys $ keys $ c `additionalKeys`
-- C-t C-t would send C-t to a focused window.
[((controlMask, xK_t), spawn "xdotool key ctrl+t")]
, modMask = controlMask
, focusedBorderColor = "#444"
, normalBorderColor = "#000"
, startupHook = runCompton
}
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