From 378b02d139002e1e5b9263fc2802c98c28fa66ab Mon Sep 17 00:00:00 2001
From: defanor <defanor@uberspace.net>
Date: Mon, 18 Dec 2017 06:49:01 +0300
Subject: Add xmonad+xmobar config

---
 .xmonad/xmonad.hs | 96 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 .xmonad/xmonad.hs

(limited to '.xmonad/xmonad.hs')

diff --git a/.xmonad/xmonad.hs b/.xmonad/xmonad.hs
new file mode 100644
index 0000000..cec291c
--- /dev/null
+++ b/.xmonad/xmonad.hs
@@ -0,0 +1,96 @@
+-- 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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